I have a form for which I should write validation logic.

Let's say there's an input field like this.

```
<div class="group1"><label>Product code</label> <input id="code" name=""code" type="text" class="control1"></div>

```

If I want to make it a required field how do I write the logic?

I don't have access to the CSS files. But there's an input like this which I can use which has a red outline.

```
<div class="group1 row has-error">
   <div><input type="text" class="control1"></div>
</div>

```

I have to give the code in JavaScript or jQuery.