text:
If the options have a clear hierarchical structure, Cascader can be used to view and select them.

### Basic usage

There are two ways to expand child option items.

:::demo Assigning the `options` attribute to an array of options renders a Cascader. The `props.expandTrigger` attribute defines how child options are expanded.
```html
<div class="block">
  <span class="demonstration">Child options expand when clicked (default)</span>
  <el-cascader
    v-model="value"
    :options="options"
    @change="handleChange"></el-cascader>
</div>
<div class="block">
  <span class="demonstration">Child options expand when hovered</span>
  <el-cascader
    v-model="value"
    :options="options"
    :props="{ expandTrigger: 'hover' }"
    @change="handleChange"></el-cascader>
</div>

<script>
  export default {
    data() {
      return {
        value: [],
        options: [{
          value: 'guide',
          label: 'Guide',
          children: [{
            value: 'disciplines',
            label: 'Disciplines',
            children: [{
              value: 'consistency',
              label: 'Consistency'
            }, {
              value: 'feedback',
              label: 'Feedback'
            }, {
              value: 'efficiency',
              label: 'Efficiency'
            }, {
              value: 'controllability',
              label: 'Controllability'
            }]
          }, {
            value: 'navigation',
            label: 'Navigation',
            children: [{
              value: 'side nav',
              label: 'Side Navigation'
            }, {
              value: 'top nav',
              label: 'Top Navigation'
            }]
          }]
        }, {
          value: 'component',
          label: 'Component',
          children: [{
            value: 'basic',
            label: 'Basic',
            children: [{
              value: 'layout',
              label: 'Layout'
            }, {
              value: 'color',
              label: 'Color'
            }, {
              value: 'typography',
              label: 'Typography'
            }, {
              value: 'icon',
              label: 'Icon'
            }, {
              value: 'button',
              label: 'Button'
            }]
          }, {
            value: 'form',
            label: 'Form',
            children: [{
              value: 'radio',
              label: 'Radio'
            }, {
              value: 'checkbox',
              label: 'Checkbox'
            }, {
              value: 'input',
              label: 'Input'
            }, {
              value: 'input-number',
              label: 'InputNumber'
            }, {
              value: 'select',
              label: 'Select'
            }, {
              value: 'cascader',
              label: 'Cascader'
            }, {
              value: 'switch',
              label: 'Switch'
            }, {
              value: 'slider',
              label: 'Slider'
            }, {
              value: 'time-picker',
              label: 'TimePicker'
            }, {
              value: 'date-picker',
              label: 'DatePicker'
            }, {
              value: 'datetime-picker',
              label: 'DateTimePicker'
            }, {
              value: 'upload',
              label: 'Upload'
            }, {
              value: 'rate',
              label: 'Rate'
            }, {
              value: 'form',
              label: 'Form'
            }]
          }, {
            value: 'data',
            label: 'Data',
            children: [{
              value: 'table',
              label: 'Table'
            }, {
              value: 'tag',
              label: 'Tag'
            }, {
              value: 'progress',
              label: 'Progress'
            }, {
              value: 'tree',
              label: 'Tree'
            }, {
              value: 'pagination',
              label: 'Pagination'
            }, {
              value: 'badge',
              label: 'Badge'
            }]
          }, {
            value: 'notice',
            label: 'Notice',
            children: [{
              value: 'alert',
              label: 'Alert'
            }, {
              value: 'loading',
              label: 'Loading'
            }, {
              value: 'message',
              label: 'Message'
            }, {
              value: 'message-box',
              label: 'MessageBox'
            }, {
              value: 'notification',
              label: 'Notification'
            }]
          }, {
            value: 'navigation',
            label: 'Navigation',
            children: [{
              value: 'menu',
              label: 'NavMenu'
            }, {
              value: 'tabs',
              label: 'Tabs'
            }, {
              value: 'breadcrumb',
              label: 'Breadcrumb'
            }, {
              value: 'dropdown',
              label: 'Dropdown'
            }, {
              value: 'steps',
              label: 'Steps'
            }]
          }, {
            value: 'others',
            label: 'Others',
            children: [{
              value: 'dialog',
              label: 'Dialog'
            }, {
              value: 'tooltip',
              label: 'Tooltip'
            }, {
              value: 'popover',
              label: 'Popover'
            }, {
              value: 'card',
              label: 'Card'
            }, {
              value: 'carousel',
              label: 'Carousel'
            }, {
              value: 'collapse',
              label: 'Collapse'
            }]
          }]
        }, {
          value: 'resource',
          label: 'Resource',
          children: [{
            value: 'axure',
            label: 'Axure Components'
          }, {
            value: 'sketch',
            label: 'Sketch Templates'
          }, {
            value: 'docs',
            label: 'Design Documentation'
          }]
        }]
      };
    },
    methods: {
      handleChange(value) {
        console.log(value);
      }
    }
  };
</script>
```
:::

### Disabled option

Disable an option by setting a `disabled` field in the option object.

:::demo In this example, the first item in `options` array has a `disabled: true` field, so it is disabled. By default, Cascader checks the `disabled` field in each option object; if you are using another field name to indicate whether an option is disabled, you can assign it in the `props.disabled` attribute (see the API table below for details). And of course, field name `value`, `label` and `children` can also be customized in the same way.
```html
<el-cascader :options="options"></el-cascader>

<script>
  export default {
    data() {
      return {
        options: [{
          value: 'guide',
          label: 'Guide',
          disabled: true,
          children: [{
            value: 'disciplines',
            label: 'Disciplines',
            children: [{
              value: 'consistency',
              label: 'Consistency'
            }, {
              value: 'feedback',
              label: 'Feedback'
            }, {
              value: 'efficiency',
              label: 'Efficiency'
            }, {
              value: 'controllability',
              label: 'Controllability'
            }]
          }, {
            value: 'navigation',
            label: 'Navigation',
            children: [{
              value: 'side nav',
              label: 'Side Navigation'
            }, {
              value: 'top nav',
              label: 'Top Navigation'
            }]
          }]
        }, {
          value: 'component',
          label: 'Component',
          children: [{
            value: 'basic',
            label: 'Basic',
            children: [{
              value: 'layout',
              label: 'Layout'
            }, {
              value: 'color',
              label: 'Color'
            }, {
              value: 'typography',
              label: 'Typography'
            }, {
              value: 'icon',
              label: 'Icon'
            }, {
              value: 'button',
              label: 'Button'
            }]
          }, {
            value: 'form',
            label: 'Form',
            children: [{
              value: 'radio',
              label: 'Radio'
            }, {
              value: 'checkbox',
              label: 'Checkbox'
            }, {
              value: 'input',
              label: 'Input'
            }, {
              value: 'input-number',
              label: 'InputNumber'
            }, {
              value: 'select',
              label: 'Select'
            }, {
              value: 'cascader',
              label: 'Cascader'
            }, {
              value: 'switch',
              label: 'Switch'
            }, {
              value: 'slider',
              label: 'Slider'
            }, {
              value: 'time-picker',
              label: 'TimePicker'
            }, {
              value: 'date-picker',
              label: 'DatePicker'
            }, {
              value: 'datetime-picker',
              label: 'DateTimePicker'
            }, {
              value: 'upload',
              label: 'Upload'
            }, {
              value: 'rate',
              label: 'Rate'
            }, {
              value: 'form',
              label: 'Form'
            }]
          }, {
            value: 'data',
            label: 'Data',
            children: [{
              value: 'table',
              label: 'Table'
            }, {
              value: 'tag',
              label: 'Tag'
            }, {
              value: 'progress',
              label: 'Progress'
            }, {
              value: 'tree',
              label: 'Tree'
            }, {
              value: 'pagination',
              label: 'Pagination'
            }, {
              value: 'badge',
              label: 'Badge'
            }]
          }, {
            value: 'notice',
            label: 'Notice',
            children: [{
              value: 'alert',
              label: 'Alert'
            }, {
              value: 'loading',
              label: 'Loading'
            }, {
              value: 'message',
              label: 'Message'
            }, {
              value: 'message-box',
              label: 'MessageBox'
            }, {
              value: 'notification',
              label: 'Notification'
            }]
          }, {
            value: 'navigation',
            label: 'Navigation',
            children: [{
              value: 'menu',
              label: 'NavMenu'
            }, {
              value: 'tabs',
              label: 'Tabs'
            }, {
              value: 'breadcrumb',
              label: 'Breadcrumb'
            }, {
              value: 'dropdown',
              label: 'Dropdown'
            }, {
              value: 'steps',
              label: 'Steps'
            }]
          }, {
            value: 'others',
            label: 'Others',
            children: [{
              value: 'dialog',
              label: 'Dialog'
            }, {
              value: 'tooltip',
              label: 'Tooltip'
            }, {
              value: 'popover',
              label: 'Popover'
            }, {
              value: 'card',
              label: 'Card'
            }, {
              value: 'carousel',
              label: 'Carousel'
            }, {
              value: 'collapse',
              label: 'Collapse'
            }]
          }]
        }, {
          value: 'resource',
          label: 'Resource',
          children: [{
            value: 'axure',
            label: 'Axure Components'
          }, {
            value: 'sketch',
            label: 'Sketch Templates'
          }, {
            value: 'docs',
            label: 'Design Documentation'
          }]
        }]
      };
    }
  };
</script>
```
:::

### Clearable

Set `clearable` attribute for `el-cascader` and a clear icon will appear when selected and hovered

:::demo
```html
<el-cascader :options="options" clearable></el-cascader>

<script>
  export default {
    data() {
      return {
        options: [{
          value: 'guide',
          label: 'Guide',
          children: [{
            value: 'disciplines',
            label: 'Disciplines',
            children: [{
              value: 'consistency',
              label: 'Consistency'
            }, {
              value: 'feedback',
              label: 'Feedback'
            }, {
              value: 'efficiency',
              label: 'Efficiency'
            }, {
              value: 'controllability',
              label: 'Controllability'
            }]
          }, {
            value: 'navigation',
            label: 'Navigation',
            children: [{
              value: 'side nav',
              label: 'Side Navigation'
            }, {
              value: 'top nav',
              label: 'Top Navigation'
            }]
          }]
        }, {
          value: 'component',
          label: 'Component',
          children: [{
            value: 'basic',
            label: 'Basic',
            children: [{
              value: 'layout',
              label: 'Layout'
            }, {
              value: 'color',
              label: 'Color'
            }, {
              value: 'typography',
              label: 'Typography'
            }, {
              value: 'icon',
              label: 'Icon'
            }, {
              value: 'button',
              label: 'Button'
            }]
          }, {
            value: 'form',
            label: 'Form',
            children: [{
              value: 'radio',
              label: 'Radio'
            }, {
              value: 'checkbox',
              label: 'Checkbox'
            }, {
              value: 'input',
              label: 'Input'
            }, {
              value: 'input-number',
              label: 'InputNumber'
            }, {
              value: 'select',
              label: 'Select'
            }, {
              value: 'cascader',
              label: 'Cascader'
            }, {
              value: 'switch',
              label: 'Switch'
            }, {
              value: 'slider',
              label: 'Slider'
            }, {
              value: 'time-picker',
              label: 'TimePicker'
            }, {
              value: 'date-picker',
              label: 'DatePicker'
            }, {
              value: 'datetime-picker',
              label: 'DateTimePicker'
            }, {
              value: 'upload',
              label: 'Upload'
            }, {
              value: 'rate',
              label: 'Rate'
            }, {
              value: 'form',
              label: 'Form'
            }]
          }, {
            value: 'data',
            label: 'Data',
            children: [{
              value: 'table',
              label: 'Table'
            }, {
              value: 'tag',
              label: 'Tag'
            }, {
              value: 'progress',
              label: 'Progress'
            }, {
              value: 'tree',
              label: 'Tree'
            }, {
              value: 'pagination',
              label: 'Pagination'
            }, {
              value: 'badge',
              label: 'Badge'
            }]
          }, {
            value: 'notice',
            label: 'Notice',
            children: [{
              value: 'alert',
              label: 'Alert'
            }, {
              value: 'loading',
              label: 'Loading'
            }, {
              value: 'message',
              label: 'Message'
            }, {
              value: 'message-box',
              label: 'MessageBox'
            }, {
              value: 'notification',
              label: 'Notification'
            }]
          }, {
            value: 'navigation',
            label: 'Navigation',
            children: [{
              value: 'menu',
              label: 'NavMenu'
            }, {
              value: 'tabs',
              label: 'Tabs'
            }, {
              value: 'breadcrumb',
              label: 'Breadcrumb'
            }, {
              value: 'dropdown',
              label: 'Dropdown'
            }, {
              value: 'steps',
              label: 'Steps'
            }]
          }, {
            value: 'others',
            label: 'Others',
            children: [{
              value: 'dialog',
              label: 'Dialog'
            }, {
              value: 'tooltip',
              label: 'Tooltip'
            }, {
              value: 'popover',
              label: 'Popover'
            }, {
              value: 'card',
              label: 'Card'
            }, {
              value: 'carousel',
              label: 'Carousel'
            }, {
              value: 'collapse',
              label: 'Collapse'
            }]
          }]
        }, {
          value: 'resource',
          label: 'Resource',
          children: [{
            value: 'axure',
            label: 'Axure Components'
          }, {
            value: 'sketch',
            label: 'Sketch Templates'
          }, {
            value: 'docs',
            label: 'Design Documentation'
          }]
        }]
      }
    }
  }
</script>
```
:::

### Display only the last level

The input can display only the last level instead of all levels.

:::demo The `show-all-levels` attribute defines if all levels are displayed. If it is `false`, only the last level is displayed.
```html
<el-cascader :options="options" :show-all-levels="false"></el-cascader>
<script>
  export default {
    data() {
      return {
        options: [{
          value: 'guide',
          label: 'Guide',
          children: [{
            value: 'disciplines',
            label: 'Disciplines',
            children: [{
              value: 'consistency',
              label: 'Consistency'
            }, {
              value: 'feedback',
              label: 'Feedback'
            }, {
              value: 'efficiency',
              label: 'Efficiency'
            }, {
              value: 'controllability',
              label: 'Controllability'
            }]
          }, {
            value: 'navigation',
            label: 'Navigation',
            children: [{
              value: 'side nav',
              label: 'Side Navigation'
            }, {
              value: 'top nav',
              label: 'Top Navigation'
            }]
          }]
        }, {
          value: 'component',
          label: 'Component',
          children: [{
            value: 'basic',
            label: 'Basic',
            children: [{
              value: 'layout',
              label: 'Layout'
            }, {
              value: 'color',
              label: 'Color'
            }, {
              value: 'typography',
              label: 'Typography'
            }, {
              value: 'icon',
              label: 'Icon'
            }, {
              value: 'button',
              label: 'Button'
            }]
          }, {
            value: 'form',
            label: 'Form',
            children: [{
              value: 'radio',
              label: 'Radio'
            }, {
              value: 'checkbox',
              label: 'Checkbox'
            }, {
              value: 'input',
              label: 'Input'
            }, {
              value: 'input-number',
              label: 'InputNumber'
            }, {
              value: 'select',
              label: 'Select'
            }, {
              value: 'cascader',
              label: 'Cascader'
            }, {
              value: 'switch',
              label: 'Switch'
            }, {
              value: 'slider',
              label: 'Slider'
            }, {
              value: 'time-picker',
              label: 'TimePicker'
            }, {
              value: 'date-picker',
              label: 'DatePicker'
            }, {
              value: 'datetime-picker',
              label: 'DateTimePicker'
            }, {
              value: 'upload',
              label: 'Upload'
            }, {
              value: 'rate',
              label: 'Rate'
            }, {
              value: 'form',
              label: 'Form'
            }]
          }, {
            value: 'data',
            label: 'Data',
            children: [{
              value: 'table',
              label: 'Table'
            }, {
              value: 'tag',
              label: 'Tag'
            }, {
              value: 'progress',
              label: 'Progress'
            }, {
              value: 'tree',
              label: 'Tree'
            }, {
              value: 'pagination',
              label: 'Pagination'
            }, {
              value: 'badge',
              label: 'Badge'
            }]
          }, {
            value: 'notice',
            label: 'Notice',
            children: [{
              value: 'alert',
              label: 'Alert'
            }, {
              value: 'loading',
              label: 'Loading'
            }, {
              value: 'message',
              label: 'Message'
            }, {
              value: 'message-box',
              label: 'MessageBox'
            }, {
              value: 'notification',
              label: 'Notification'
            }]
          }, {
            value: 'navigation',
            label: 'Navigation',
            children: [{
              value: 'menu',
              label: 'NavMenu'
            }, {
              value: 'tabs',
              label: 'Tabs'
            }, {
              value: 'breadcrumb',
              label: 'Breadcrumb'
            }, {
              value: 'dropdown',
              label: 'Dropdown'
            }, {
              value: 'steps',
              label: 'Steps'
            }]
          }, {
            value: 'others',
            label: 'Others',
            children: [{
              value: 'dialog',
              label: 'Dialog'
            }, {
              value: 'tooltip',
              label: 'Tooltip'
            }, {
              value: 'popover',
              label: 'Popover'
            }, {
              value: 'card',
              label: 'Card'
            }, {
              value: 'carousel',
              label: 'Carousel'
            }, {
              value: 'collapse',
              label: 'Collapse'
            }]
          }]
        }, {
          value: 'resource',
          label: 'Resource',
          children: [{
            value: 'axure',
            label: 'Axure Components'
          }, {
            value: 'sketch',
            label: 'Sketch Templates'
          }, {
            value: 'docs',
            label: 'Design Documentation'
          }]
        }]
      };
    }
  };
</script>
```
:::

### Multiple Selection

Set `props.multiple = true` to use multiple selection.

:::demo When using multiple selection, all selected tags will display by default, You can set `collapse-tags = true` to fold selected tags.
```html
<div class="block">
  <span class="demonstration">Display all tags (default)</span>
  <el-cascader
    :options="options"
    :props="props"
    clearable></el-cascader>
</div>
<div class="block">
  <span class="demonstration">Collapse tags</span>
  <el-cascader
    :options="options"
    :props="props"
    collapse-tags
    clearable></el-cascader>
</div>

<script>
  export default {
    data() {
      return {
        props: { multiple: true },
        options: [{
          value: 1,
          label: 'Asia',
          children: [{
            value: 2,
            label: 'China',
            children: [
              { value: 3, label: 'Beijing' },
              { value: 4, label: 'Shanghai' },
              { value: 5, label: 'Hangzhou' }
            ]
          }, {
            value: 6,
            label: 'Japan',
            children: [
              { value: 7, label: 'Tokyo' },
              { value: 8, label: 'Osaka' },
              { value: 9, label: 'Kyoto' }
            ]
          }, {
            value: 10,
            label: 'Korea',
            children: [
              { value: 11, label: 'Seoul' },
              { value: 12, label: 'Busan' },
              { value: 13, label: 'Taegu' }
            ]
          }]
        }, {
          value: 14,
          label: 'Europe',
          children: [{
            value: 15,
            label: 'France',
            children: [
              { value: 16, label: 'Paris' },
              { value: 17, label: 'Marseille' },
              { value: 18, label: 'Lyon' }
            ]
          }, {
            value: 19,
            label: 'UK',
            children: [
              { value: 20, label: 'London' },
              { value: 21, label: 'Birmingham' },
              { value: 22, label: 'Manchester' }
            ]
          }]
        }, {
          value: 23,
          label: 'North America',
          children: [{
            value: 24,
            label: 'US',
            children: [
              { value: 25, label: 'New York' },
              { value: 26, label: 'Los Angeles' },
              { value: 27, label: 'Washington' }
            ]
          }, {
            value: 28,
            label: 'Canada',
            children: [
              { value: 29, label: 'Toronto' },
              { value: 30, label: 'Montreal' },
              { value: 31, label: 'Ottawa' }
            ]
          }]
        }]
      };
    }
  };
</script>
```
:::

### Select any level of options

In single selection, only the leaf nodes can be checked, and in multiple selection, check parent nodes will lead to leaf nodes be checked eventually. When enable this feature, it can make parent and child nodes unlinked and you can select any level of options.

:::demo Set `props.checkStrictly = true` to make checked state of a node not affects its parent nodes and child nodes, and then you can select any level of options.
```html
<div class="block">
  <span class="demonstration">Select any level of options (Single selection)</span>
  <el-cascader
    :options="options"
    :props="{ checkStrictly: true }"
    clearable></el-cascader>
</div>
<div class="block">
  <span class="demonstration">Select any level of options (Multiple selection)</span>
  <el-cascader
    :options="options"
    :props="{ multiple: true, checkStrictly: true }"
    clearable></el-cascader>
</div>

<script>
  export default {
    data() {
      return {
        options: [{
          value: 'guide',
          label: 'Guide',
          children: [{
            value: 'disciplines',
            label: 'Disciplines',
            children: [{
              value: 'consistency',
              label: 'Consistency'
            }, {
              value: 'feedback',
              label: 'Feedback'
            }, {
              value: 'efficiency',
              label: 'Efficiency'
            }, {
              value: 'controllability',
              label: 'Controllability'
            }]
          }, {
            value: 'navigation',
            label: 'Navigation',
            children: [{
              value: 'side nav',
              label: 'Side Navigation'
            }, {
              value: 'top nav',
              label: 'Top Navigation'
            }]
          }]
        }, {
          value: 'component',
          label: 'Component',
          children: [{
            value: 'basic',
            label: 'Basic',
            children: [{
              value: 'layout',
              label: 'Layout'
            }, {
              value: 'color',
              label: 'Color'
            }, {
              value: 'typography',
              label: 'Typography'
            }, {
              value: 'icon',
              label: 'Icon'
            }, {
              value: 'button',
              label: 'Button'
            }]
          }, {
            value: 'form',
            label: 'Form',
            children: [{
              value: 'radio',
              label: 'Radio'
            }, {
              value: 'checkbox',
              label: 'Checkbox'
            }, {
              value: 'input',
              label: 'Input'
            }, {
              value: 'input-number',
              label: 'InputNumber'
            }, {
              value: 'select',
              label: 'Select'
            }, {
              value: 'cascader',
              label: 'Cascader'
            }, {
              value: 'switch',
              label: 'Switch'
            }, {
              value: 'slider',
              label: 'Slider'
            }, {
              value: 'time-picker',
              label: 'TimePicker'
            }, {
              value: 'date-picker',
              label: 'DatePicker'
            }, {
              value: 'datetime-picker',
              label: 'DateTimePicker'
            }, {
              value: 'upload',
              label: 'Upload'
            }, {
              value: 'rate',
              label: 'Rate'
            }, {
              value: 'form',
              label: 'Form'
            }]
          }, {
            value: 'data',
            label: 'Data',
            children: [{
              value: 'table',
              label: 'Table'
            }, {
              value: 'tag',
              label: 'Tag'
            }, {
              value: 'progress',
              label: 'Progress'
            }, {
              value: 'tree',
              label: 'Tree'
            }, {
              value: 'pagination',
              label: 'Pagination'
            }, {
              value: 'badge',
              label: 'Badge'
            }]
          }, {
            value: 'notice',
            label: 'Notice',
            children: [{
              value: 'alert',
              label: 'Alert'
            }, {
              value: 'loading',
              label: 'Loading'
            }, {
              value: 'message',
              label: 'Message'
            }, {
              value: 'message-box',
              label: 'MessageBox'
            }, {
              value: 'notification',
              label: 'Notification'
            }]
          }, {
            value: 'navigation',
            label: 'Navigation',
            children: [{
              value: 'menu',
              label: 'NavMenu'
            }, {
              value: 'tabs',
              label: 'Tabs'
            }, {
              value: 'breadcrumb',
              label: 'Breadcrumb'
            }, {
              value: 'dropdown',
              label: 'Dropdown'
            }, {
              value: 'steps',
              label: 'Steps'
            }]
          }, {
            value: 'others',
            label: 'Others',
            children: [{
              value: 'dialog',
              label: 'Dialog'
            }, {
              value: 'tooltip',
              label: 'Tooltip'
            }, {
              value: 'popover',
              label: 'Popover'
            }, {
              value: 'card',
              label: 'Card'
            }, {
              value: 'carousel',
              label: 'Carousel'
            }, {
              value: 'collapse',
              label: 'Collapse'
            }]
          }]
        }, {
          value: 'resource',
          label: 'Resource',
          children: [{
            value: 'axure',
            label: 'Axure Components'
          }, {
            value: 'sketch',
            label: 'Sketch Templates'
          }, {
            value: 'docs',
            label: 'Design Documentation'
          }]
        }]
      };
    }
  };
</script>
```
:::

### Dynamic loading

Dynamic load its child nodes when checked a node.

:::demo Set `lazy = true` to use dynamic loading, and you have to specify how to load the data source by `lazyload`. There are two parameters of `lazyload`,the first parameter `node` is the node currently clicked, and the `resolve` is a callback that indicate loading is finished which must invoke. To display the status of node more accurately, you can add a `leaf` field (can be modified by `props.leaf`) to indicate whether it is a leaf node. Otherwise, it will be inferred by if has any child nodes.
```html
<el-cascader :props="props"></el-cascader>

<script>
  let id = 0;

  export default {
    data() {
      return {
        props: {
          lazy: true,
          lazyLoad (node, resolve) {
            const { level } = node;
            setTimeout(() => {
              const nodes = Array.from({ length: level + 1 })
                .map(item => ({
                  value: ++id,
                  label: `Option - ${id}`,
                  leaf: level >= 2
                }));
              // Invoke `resolve` callback to return the child nodes data and indicate the loading is finished.
              resolve(nodes);
            }, 1000);
          }
        }
      };
    }
  };
</script>
```
:::

### Filterable

Search and select options with a keyword.

:::demo Adding `filterable` to `el-cascader` enables filtering. Cascader will match nodes whose label or parent's label (according to `show-all-levels`) includes input keyword. Of course, you can customize search logic by `filter-method` which accepts a function, the first parameter is `node`, the second is `keyword`, and need return a boolean value indicating whether it hits.
```html
<div class="block">
  <span class="demonstration">Filterable (Single selection)</span>
  <el-cascader
    placeholder="Try searchingL Guide"
    :options="options"
    filterable></el-cascader>
</div>
<div class="block">
  <span class="demonstration">Filterable (Multiple selection)</span>
  <el-cascader
    placeholder="Try searchingL Guide"
    :options="options"
    :props="{ multiple: true }"
    filterable></el-cascader>
</div>

<script>
  export default {
    data() {
      return {
        options: [{
          value: 'guide',
          label: 'Guide',
          children: [{
            value: 'disciplines',
            label: 'Disciplines',
            children: [{
              value: 'consistency',
              label: 'Consistency'
            }, {
              value: 'feedback',
              label: 'Feedback'
            }, {
              value: 'efficiency',
              label: 'Efficiency'
            }, {
              value: 'controllability',
              label: 'Controllability'
            }]
          }, {
            value: 'navigation',
            label: 'Navigation',
            children: [{
              value: 'side nav',
              label: 'Side Navigation'
            }, {
              value: 'top nav',
              label: 'Top Navigation'
            }]
          }]
        }, {
          value: 'component',
          label: 'Component',
          children: [{
            value: 'basic',
            label: 'Basic',
            children: [{
              value: 'layout',
              label: 'Layout'
            }, {
              value: 'color',
              label: 'Color'
            }, {
              value: 'typography',
              label: 'Typography'
            }, {
              value: 'icon',
              label: 'Icon'
            }, {
              value: 'button',
              label: 'Button'
            }]
          }, {
            value: 'form',
            label: 'Form',
            children: [{
              value: 'radio',
              label: 'Radio'
            }, {
              value: 'checkbox',
              label: 'Checkbox'
            }, {
              value: 'input',
              label: 'Input'
            }, {
              value: 'input-number',
              label: 'InputNumber'
            }, {
              value: 'select',
              label: 'Select'
            }, {
              value: 'cascader',
              label: 'Cascader'
            }, {
              value: 'switch',
              label: 'Switch'
            }, {
              value: 'slider',
              label: 'Slider'
            }, {
              value: 'time-picker',
              label: 'TimePicker'
            }, {
              value: 'date-picker',
              label: 'DatePicker'
            }, {
              value: 'datetime-picker',
              label: 'DateTimePicker'
            }, {
              value: 'upload',
              label: 'Upload'
            }, {
              value: 'rate',
              label: 'Rate'
            }, {
              value: 'form',
              label: 'Form'
            }]
          }, {
            value: 'data',
            label: 'Data',
            children: [{
              value: 'table',
              label: 'Table'
            }, {
              value: 'tag',
              label: 'Tag'
            }, {
              value: 'progress',
              label: 'Progress'
            }, {
              value: 'tree',
              label: 'Tree'
            }, {
              value: 'pagination',
              label: 'Pagination'
            }, {
              value: 'badge',
              label: 'Badge'
            }]
          }, {
            value: 'notice',
            label: 'Notice',
            children: [{
              value: 'alert',
              label: 'Alert'
            }, {
              value: 'loading',
              label: 'Loading'
            }, {
              value: 'message',
              label: 'Message'
            }, {
              value: 'message-box',
              label: 'MessageBox'
            }, {
              value: 'notification',
              label: 'Notification'
            }]
          }, {
            value: 'navigation',
            label: 'Navigation',
            children: [{
              value: 'menu',
              label: 'NavMenu'
            }, {
              value: 'tabs',
              label: 'Tabs'
            }, {
              value: 'breadcrumb',
              label: 'Breadcrumb'
            }, {
              value: 'dropdown',
              label: 'Dropdown'
            }, {
              value: 'steps',
              label: 'Steps'
            }]
          }, {
            value: 'others',
            label: 'Others',
            children: [{
              value: 'dialog',
              label: 'Dialog'
            }, {
              value: 'tooltip',
              label: 'Tooltip'
            }, {
              value: 'popover',
              label: 'Popover'
            }, {
              value: 'card',
              label: 'Card'
            }, {
              value: 'carousel',
              label: 'Carousel'
            }, {
              value: 'collapse',
              label: 'Collapse'
            }]
          }]
        }, {
          value: 'resource',
          label: 'Resource',
          children: [{
            value: 'axure',
            label: 'Axure Components'
          }, {
            value: 'sketch',
            label: 'Sketch Templates'
          }, {
            value: 'docs',
            label: 'Design Documentation'
          }]
        }]
      };
    }
  };
</script>
```
:::

### Custom option content

You can customize the content of cascader node.

:::demo You can customize the content of cascader node by `scoped slot`. You'll have access to `node` and `data` in the scope,  standing for the Node object and node data of the current node respectively。
```html
<el-cascader :options="options">
  <template slot-scope="{ node, data }">
    <span>{{ data.label }}</span>
    <span v-if="!node.isLeaf"> ({{ data.children.length }}) </span>
  </template>
</el-cascader>

<script>
  export default {
    data() {
      return {
        options: [{
          value: 'guide',
          label: 'Guide',
          children: [{
            value: 'disciplines',
            label: 'Disciplines',
            children: [{
              value: 'consistency',
              label: 'Consistency'
            }, {
              value: 'feedback',
              label: 'Feedback'
            }, {
              value: 'efficiency',
              label: 'Efficiency'
            }, {
              value: 'controllability',
              label: 'Controllability'
            }]
          }, {
            value: 'navigation',
            label: 'Navigation',
            children: [{
              value: 'side nav',
              label: 'Side Navigation'
            }, {
              value: 'top nav',
              label: 'Top Navigation'
            }]
          }]
        }, {
          value: 'component',
          label: 'Component',
          children: [{
            value: 'basic',
            label: 'Basic',
            children: [{
              value: 'layout',
              label: 'Layout'
            }, {
              value: 'color',
              label: 'Color'
            }, {
              value: 'typography',
              label: 'Typography'
            }, {
              value: 'icon',
              label: 'Icon'
            }, {
              value: 'button',
              label: 'Button'
            }]
          }, {
            value: 'form',
            label: 'Form',
            children: [{
              value: 'radio',
              label: 'Radio'
            }, {
              value: 'checkbox',
              label: 'Checkbox'
            }, {
              value: 'input',
              label: 'Input'
            }, {
              value: 'input-number',
              label: 'InputNumber'
            }, {
              value: 'select',
              label: 'Select'
            }, {
              value: 'cascader',
              label: 'Cascader'
            }, {
              value: 'switch',
              label: 'Switch'
            }, {
              value: 'slider',
              label: 'Slider'
            }, {
              value: 'time-picker',
              label: 'TimePicker'
            }, {
              value: 'date-picker',
              label: 'DatePicker'
            }, {
              value: 'datetime-picker',
              label: 'DateTimePicker'
            }, {
              value: 'upload',
              label: 'Upload'
            }, {
              value: 'rate',
              label: 'Rate'
            }, {
              value: 'form',
              label: 'Form'
            }]
          }, {
            value: 'data',
            label: 'Data',
            children: [{
              value: 'table',
              label: 'Table'
            }, {
              value: 'tag',
              label: 'Tag'
            }, {
              value: 'progress',
              label: 'Progress'
            }, {
              value: 'tree',
              label: 'Tree'
            }, {
              value: 'pagination',
              label: 'Pagination'
            }, {
              value: 'badge',
              label: 'Badge'
            }]
          }, {
            value: 'notice',
            label: 'Notice',
            children: [{
              value: 'alert',
              label: 'Alert'
            }, {
              value: 'loading',
              label: 'Loading'
            }, {
              value: 'message',
              label: 'Message'
            }, {
              value: 'message-box',
              label: 'MessageBox'
            }, {
              value: 'notification',
              label: 'Notification'
            }]
          }, {
            value: 'navigation',
            label: 'Navigation',
            children: [{
              value: 'menu',
              label: 'NavMenu'
            }, {
              value: 'tabs',
              label: 'Tabs'
            }, {
              value: 'breadcrumb',
              label: 'Breadcrumb'
            }, {
              value: 'dropdown',
              label: 'Dropdown'
            }, {
              value: 'steps',
              label: 'Steps'
            }]
          }, {
            value: 'others',
            label: 'Others',
            children: [{
              value: 'dialog',
              label: 'Dialog'
            }, {
              value: 'tooltip',
              label: 'Tooltip'
            }, {
              value: 'popover',
              label: 'Popover'
            }, {
              value: 'card',
              label: 'Card'
            }, {
              value: 'carousel',
              label: 'Carousel'
            }, {
              value: 'collapse',
              label: 'Collapse'
            }]
          }]
        }, {
          value: 'resource',
          label: 'Resource',
          children: [{
            value: 'axure',
            label: 'Axure Components'
          }, {
            value: 'sketch',
            label: 'Sketch Templates'
          }, {
            value: 'docs',
            label: 'Design Documentation'
          }]
        }]
      }
    }
  }
</script>
```
:::

### Cascader panel

`CascaderPanel` is the core component of `Cascader` which has various of features such as single selection, multiple selection, dynamic loading and so on.

:::demo Just like `el-cascader`, you can set alternative options by `options`, and enable other features by `props`, see the API form below for details.
```html
<el-cascader-panel :options="options"></el-cascader-panel>

<script>
  export default {
    data() {
      return {
        options: [{
          value: 'guide',
          label: 'Guide',
          children: [{
            value: 'disciplines',
            label: 'Disciplines',
            children: [{
              value: 'consistency',
              label: 'Consistency'
            }, {
              value: 'feedback',
              label: 'Feedback'
            }, {
              value: 'efficiency',
              label: 'Efficiency'
            }, {
              value: 'controllability',
              label: 'Controllability'
            }]
          }, {
            value: 'navigation',
            label: 'Navigation',
            children: [{
              value: 'side nav',
              label: 'Side Navigation'
            }, {
              value: 'top nav',
              label: 'Top Navigation'
            }]
          }]
        }, {
          value: 'component',
          label: 'Component',
          children: [{
            value: 'basic',
            label: 'Basic',
            children: [{
              value: 'layout',
              label: 'Layout'
            }, {
              value: 'color',
              label: 'Color'
            }, {
              value: 'typography',
              label: 'Typography'
            }, {
              value: 'icon',
              label: 'Icon'
            }, {
              value: 'button',
              label: 'Button'
            }]
          }, {
            value: 'form',
            label: 'Form',
            children: [{
              value: 'radio',
              label: 'Radio'
            }, {
              value: 'checkbox',
              label: 'Checkbox'
            }, {
              value: 'input',
              label: 'Input'
            }, {
              value: 'input-number',
              label: 'InputNumber'
            }, {
              value: 'select',
              label: 'Select'
            }, {
              value: 'cascader',
              label: 'Cascader'
            }, {
              value: 'switch',
              label: 'Switch'
            }, {
              value: 'slider',
              label: 'Slider'
            }, {
              value: 'time-picker',
              label: 'TimePicker'
            }, {
              value: 'date-picker',
              label: 'DatePicker'
            }, {
              value: 'datetime-picker',
              label: 'DateTimePicker'
            }, {
              value: 'upload',
              label: 'Upload'
            }, {
              value: 'rate',
              label: 'Rate'
            }, {
              value: 'form',
              label: 'Form'
            }]
          }, {
            value: 'data',
            label: 'Data',
            children: [{
              value: 'table',
              label: 'Table'
            }, {
              value: 'tag',
              label: 'Tag'
            }, {
              value: 'progress',
              label: 'Progress'
            }, {
              value: 'tree',
              label: 'Tree'
            }, {
              value: 'pagination',
              label: 'Pagination'
            }, {
              value: 'badge',
              label: 'Badge'
            }]
          }, {
            value: 'notice',
            label: 'Notice',
            children: [{
              value: 'alert',
              label: 'Alert'
            }, {
              value: 'loading',
              label: 'Loading'
            }, {
              value: 'message',
              label: 'Message'
            }, {
              value: 'message-box',
              label: 'MessageBox'
            }, {
              value: 'notification',
              label: 'Notification'
            }]
          }, {
            value: 'navigation',
            label: 'Navigation',
            children: [{
              value: 'menu',
              label: 'NavMenu'
            }, {
              value: 'tabs',
              label: 'Tabs'
            }, {
              value: 'breadcrumb',
              label: 'Breadcrumb'
            }, {
              value: 'dropdown',
              label: 'Dropdown'
            }, {
              value: 'steps',
              label: 'Steps'
            }]
          }, {
            value: 'others',
            label: 'Others',
            children: [{
              value: 'dialog',
              label: 'Dialog'
            }, {
              value: 'tooltip',
              label: 'Tooltip'
            }, {
              value: 'popover',
              label: 'Popover'
            }, {
              value: 'card',
              label: 'Card'
            }, {
              value: 'carousel',
              label: 'Carousel'
            }, {
              value: 'collapse',
              label: 'Collapse'
            }]
          }]
        }, {
          value: 'resource',
          label: 'Resource',
          children: [{
            value: 'axure',
            label: 'Axure Components'
          }, {
            value: 'sketch',
            label: 'Sketch Templates'
          }, {
            value: 'docs',
            label: 'Design Documentation'
          }]
        }]
      };
    }
  };
</script>
```
:::

### Cascader Attributes
| Attribute | Description | Type  | Accepted Values | Default |
|---------- |-------- |---------- |-------------  |-------- |
| value / v-model | binding value | - | — | — |
| options | data of the options,the key of `value` and `label` can be customize by `Props`.| array | — | — |
| props | configuration options, see the following table. | object | — | — |
| size | size of input | string | medium / small / mini | — |
| placeholder | placeholder of input | string | — | Select |
| disabled | whether Cascader is disabled | boolean | — | false |
| clearable | whether selected value can be cleared | boolean | — | false |
| show-all-levels | whether to display all levels of the selected value in the input | boolean | — | true |
| collapse-tags | whether to collapse tags in multiple selection mode | boolean | - | false |
| separator | option label separator | string | — | ' / ' |
| filterable | whether the options can be searched | boolean | — | — |
| filter-method | customize search logic, the first parameter is `node`, the second is `keyword`, and need return a boolean value indicating whether it hits. | function(node, keyword) | - | - |
| debounce | debounce delay when typing filter keyword, in milliseconds | number | — | 300 |
| before-filter | hook function before filtering with the value to be filtered as its parameter. If `false` is returned or a `Promise` is returned and then is rejected, filtering will be aborted | function(value) | — | — |
| popper-class | custom class name for Cascader's dropdown   | string | —  | — |

### Cascader Events
| Event Name | Description | Parameters |
|---------- |-------- |---------- |
| change | triggers when the binding value changes | value |
| expand-change | triggers when expand option changes | an array of the expanding node's parent nodes |
| blur | triggers when Cascader blurs | (event: Event) |
| focus | triggers when Cascader focuses | (event: Event) |
| visible-change | triggers when the dropdown appears/disappears | true when it appears, and false otherwise |
| remove-tag | triggers when remove tag in multiple selection mode | the value of the tag which is removed |

### Cascader Methods
| Method Name | Description | Parameters |
| ---- | ---- | ---- |
| getCheckedNodes | get an array of currently selected node | (leafOnly) whether only return the leaf checked nodes, default is `false` |

### Cascader Slots
| Slot Name | Description |
|---------|-------------|
| - | the custom content of cascader node, the parameter is { node, data }, which are current Node object and node data respectively. |
| empty  | content when there is no matched options. |

### CascaderPanel Attributes
| Attribute | Description | Type  | Accepted Values | Default |
|---------- |-------- |---------- |-------------  |-------- |
| value / v-model | binding value | - | — | — |
| options | data of the options,the key of `value` and `label` can be customize by `Props`.| array | — | — |
| props | configuration options, see the following table. | object | — | — |

### CascaderPanel Events
| Event Name | Description | Parameters |
|---------- |-------- |---------- |
| change | triggers when the binding value changes | value |
| expand-change | triggers when expand option changes | an array of the expanding node's parent nodes |

### CascaderPanel Methods
| Method Name | Description | Parameters |
| ---- | ---- | ---- |
| getCheckedNodes | get an array of currently selected node | (leafOnly) whether only return the leaf checked nodes, default is `false` |
| clearCheckedNodes | clear checked nodes | - |

### CascaderPanel Slots
| Slot Name | Description |
|---------|-------------|
| - | the custom content of cascader node, the parameter is { node, data }, which are current Node object and node data respectively. |

### Props
| Attribute | Description | Type  | Accepted Values | Default |
| -------- | ----------------- | ------ | ------ | ------ |
| expandTrigger | trigger mode of expanding options | string | click / hover | 'click' |
| multiple | whether multiple selection is enabled | boolean | - | false |
| checkStrictly | whether checked state of a node not affects its parent and child nodes | boolean | - | false |
| emitPath | when checked nodes change, whether to emit an array of node's path, if false, only emit the value of node. | boolean | - | true |
| lazy | whether to dynamic load child nodes, use with `lazyload` attribute | boolean | - | false |
| lazyLoad | method for loading child nodes data, only works when `lazy` is true | function(node, resolve) | - | - |
| value    | specify which key of node object is used as the node's value | string | — | 'value' |
| label    | specify which key of node object is used as the node's label | string | — | 'label' |
| children | specify which key of node object is used as the node's children | string | — | 'children' |
| disabled | specify which key of node object is used as the node's disabled | string | — | 'disabled' |
| leaf     | specify which key of node object is used as the node's leaf field | string | — | 'leaf' |


text:
<?php

use Doctrine\Common\Annotations\AnnotationRegistry;

if (!is_file($loaderFile = __DIR__.'/../vendor/autoload.php')) {
    throw new \RuntimeException('Could not find autoload.php in vendor/. Did you run "composer install --dev"?');
}

$loader = require $loaderFile;

AnnotationRegistry::registerLoader(array($loader, 'loadClass'));

initDatabase();

function initDatabase()
{
    $sqls = array(
        "CREATE TABLE translation_domain (id INTEGER NOT NULL, name VARCHAR(255) NOT NULL, createdAt DATETIME DEFAULT NULL, updatedAt DATETIME DEFAULT NULL, PRIMARY KEY(id))",
        "CREATE TABLE translation_domain_translation (id INTEGER NOT NULL, translatable_id INTEGER DEFAULT NULL, title VARCHAR(255) DEFAULT NULL, locale VARCHAR(255) NOT NULL, PRIMARY KEY(id), CONSTRAINT FK_F6B1F942C2AC5D3 FOREIGN KEY (translatable_id) REFERENCES translation_domain (id) ON DELETE CASCADE NOT DEFERRABLE INITIALLY IMMEDIATE)",
        "CREATE TABLE translation_unit (id INTEGER NOT NULL, domain_id INTEGER NOT NULL, token VARCHAR(255) NOT NULL, createdAt DATETIME DEFAULT NULL, updatedAt DATETIME DEFAULT NULL, PRIMARY KEY(id), CONSTRAINT FK_F199AFC8115F0EE5 FOREIGN KEY (domain_id) REFERENCES translation_domain (id) NOT DEFERRABLE INITIALLY IMMEDIATE)",
        "CREATE TABLE translation_unit_translation (id INTEGER NOT NULL, translatable_id INTEGER DEFAULT NULL, content CLOB DEFAULT NULL, locale VARCHAR(255) NOT NULL, PRIMARY KEY(id), CONSTRAINT FK_62CA630B2C2AC5D3 FOREIGN KEY (translatable_id) REFERENCES translation_unit (id) ON DELETE CASCADE NOT DEFERRABLE INITIALLY IMMEDIATE)",
    );

    $dbPath = sys_get_temp_dir() . '/ArgentumTranslationBundle/cache/test.db';
    if (!is_dir($dbDir = dirname($dbPath))) {
        mkdir($dbDir, 0777, true);
    }

    if (is_file($dbPath)) {
        unlink($dbPath);
    }

    if ($db = new PDO('sqlite:' . $dbPath)) {
        $db->beginTransaction();
        foreach ($sqls as $sql) {
            $db->exec($sql);
        }
        $db->commit();
    }
}

redpajama_set_name: RedPajamaGithub


text:
All the necessary information(app preferences and plugins list) is in the config.xml file.

### Installing the Cordova
    npm install -g cordova

### Create the App
    cordova create hello com.example.hello HelloWorld```

### Add platforms
    cd hello
    cordova platform add ios --save
    cordova platform add android --save

### Install pre-requisites for building
    cordova requirements

    Requirements check results for android:
    Java JDK: installed .
    Android SDK: installed
    Android target: installed android-19,android-21,android-22,android-23,Google Inc.:Google APIs:19,Google Inc.:Google APIs (x86 System Image):19,Google Inc.:Google APIs:23
    Gradle: installed

    Requirements check results for ios:
    Apple OS X: not installed
    Cordova tooling for iOS requires Apple OS X
    Error: Some of requirements check failed

### Build the App
    cordova build ios
    cordova build android

### Test the App
    cordova emulate android
    * In iOS platform for building in real devices a development account is necessary. ( Apple Developer Account )

### Install Plugins
    //check whether the plugins in the config.xml has been installed
    cordova plugin ls
    cordova-plugin-camera 2.1.0 "Camera"


text:
package io.castle.client.model;

import java.util.ArrayList;
import java.util.List;
import java.util.Objects;

public class CastleHeaders {

    private List<CastleHeader> headers;

    public List<CastleHeader> getHeaders() {
        return headers;
    }

    public static Builder builder() {
        return new Builder(new CastleHeaders());
    }

    public void setHeaders(List<CastleHeader> headers) {
        this.headers = headers;
    }

    public CastleHeaders(List<CastleHeader> headers) { this.headers = headers; }

    public CastleHeaders() {}

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;
        CastleHeaders that = (CastleHeaders) o;
        return Objects.equals(headers, that.headers);
    }

    @Override
    public int hashCode() {
        return Objects.hash(headers);
    }

    @Override
    public String toString() {
        return "CastleHeaders{" +
                "headers=" + headers +
                '}';
    }

    public static class Builder {
        private CastleHeaders headers;
        private ArrayList<CastleHeader> headerList;

        public Builder(CastleHeaders headers) {
            this.headers = headers;
            this.headerList = new ArrayList<>();
        }

        public CastleHeaders build() {
            headers.setHeaders(headerList);
            return headers;
        }

        public Builder add(String key, String value) {
            this.headerList.add(new CastleHeader(key, value));
            return this;
        }
    }
}