Body: <p>I'm trying to access the value of an asset field in a backend entry form from my plugins own field type.</p>
  
  <p>At the moment it's looking like the following:</p>
  
  <pre><code>public function prepValue($value)
  {
      $filename = "path/to/csv";
  
      if( ($handle = fopen( $filename, "r")) !== FALSE) {
          $rowCounter = 0;
          while (($rowData = fgetcsv($handle, 0, ";")) !== FALSE) {
              if( 0 === $rowCounter) {
                  $headerRecord = $rowData;
              } else {
                  foreach( $rowData as $key =&gt; $val) {
                      $value[ $rowCounter - 1][ $headerRecord[ $key] ] = $val;  
                  }
              }
              $rowCounter++;
          }
          fclose($handle);
      }
      return $value;
  }
  </code></pre>
  
  <p>All of the csv values are mapped to a table column of the same field type:</p>
  
  <pre><code>public function getInputHtml($name, $value)
  {   
      $id = 'test';
      $cols = array(
          'col_1' =&gt; array(
              'heading' =&gt; 'Col 1',
              'type'    =&gt; 'singleline',
          ),
          'col_2'   =&gt; array(
              'heading' =&gt; 'Col 2',
              'type'    =&gt; 'singleline'
          ),
          'col_3'   =&gt; array(
              'heading' =&gt; 'Col 3',
              'type'    =&gt; 'number'
          ),
          'col_4'   =&gt; array(
              'heading' =&gt; 'Col 4',
              'type'    =&gt; 'number'
          ),
          'col_5'   =&gt; array(
              'heading' =&gt; 'Col 5',
              'type'    =&gt; 'singleline'
          ),
          'col_6'   =&gt; array(
              'heading' =&gt; 'Col 6',
              'type'    =&gt; 'singleline',
          ),
      );
  
      return craft()-&gt;templates-&gt;render('csvImport/csvimport', array(
          'name'  =&gt; $name,
          'value' =&gt; $value,
          'id'    =&gt; $id,
          'cols'  =&gt; $cols,
  
      ));
  }
  </code></pre>
  
  <p>I would like to fill $filename dynamically with the value of an asset field in the same entry backend form. Is this possible?</p>
  
  <p>//EDIT:</p>
  
  <p>Ok I solved the above problem by just changing the prepValue() to the prepValueFromPost()-Function. I now am able to access every piece of data I want to through the post array.</p>
  
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2014-11-03T19:06:33.330Z
Comments.Text: When do you need the value? Do you need it before saving the entry or do you need it as soon as the other field's value changes?
Comments.UserDisplayName: Tyler Willingham
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2014-11-04T10:39:33.503Z
Comments.Text: It would be enough to have it when the save button is clicked. So in the "onBeforeSave" function for example (which never seems to be called for whatever reasons...).
Comments.UserDisplayName: LikeAJohny
Tags: <plugin-development><entry><custom-fieldtype>
Title: Is it possible to access backend fields from my own field type?
ThreadText: # Is it possible to access backend fields from my own field type?
  
  (Asked by: username_0 on 2014-11-03)
  
  I'm trying to access the value of an asset field in a backend entry form from my plugins own field type.
  
  At the moment it's looking like the following:
  
  ```
  public function prepValue($value)
  {
      $filename = "path/to/csv";
  
      if( ($handle = fopen( $filename, "r")) !== FALSE) {
          $rowCounter = 0;
          while (($rowData = fgetcsv($handle, 0, ";")) !== FALSE) {
              if( 0 === $rowCounter) {
                  $headerRecord = $rowData;
              } else {
                  foreach( $rowData as $key => $val) {
                      $value[ $rowCounter - 1][ $headerRecord[ $key] ] = $val;  
                  }
              }
              $rowCounter++;
          }
          fclose($handle);
      }
      return $value;
  }
  
  ```
  
  All of the csv values are mapped to a table column of the same field type:
  
  ```
  public function getInputHtml($name, $value)
  {   
      $id = 'test';
      $cols = array(
          'col_1' => array(
              'heading' => 'Col 1',
              'type'    => 'singleline',
          ),
          'col_2'   => array(
              'heading' => 'Col 2',
              'type'    => 'singleline'
          ),
          'col_3'   => array(
              'heading' => 'Col 3',
              'type'    => 'number'
          ),
          'col_4'   => array(
              'heading' => 'Col 4',
              'type'    => 'number'
          ),
          'col_5'   => array(
              'heading' => 'Col 5',
              'type'    => 'singleline'
          ),
          'col_6'   => array(
              'heading' => 'Col 6',
              'type'    => 'singleline',
          ),
      );
  
      return craft()->templates->render('csvImport/csvimport', array(
          'name'  => $name,
          'value' => $value,
          'id'    => $id,
          'cols'  => $cols,
  
      ));
  }
  
  ```
  
  I would like to fill $filename dynamically with the value of an asset field in the same entry backend form. Is this possible?
  
  //EDIT:
  
  Ok I solved the above problem by just changing the prepValue() to the prepValueFromPost()-Function. I now am able to access every piece of data I want to through the post array.
  
  **Tags:** plugin-development, entry, custom-fieldtype
  
  > **Comments:**
  > **username_1**: When do you need the value? Do you need it before saving the entry or do you need it as soon as the other field's value changes?  
  > **username_0**: It would be enough to have it when the save button is clicked. So in the "onBeforeSave" function for example (which never seems to be called for whatever reasons...).  
  
  ---
  
  ## 0 answers
  
  