如何在我的下拉菜单上应用Onclick [codeigniter]

Question

I have a dropdown list then submit form when you click select values from dropdown

using this code

 onchange="this.form.submit()"

But I don't know how to put this on my dropdown check my code below,

<?php foreach($options as $key_option=>$val_option):?>
    <div class="col-lg-3">
        <label class="control-label">
            <?php echo $required_notice.$val_option['option']?>
            <?php if(!empty($options_lang[$key][$key_option]->hint)):?>
            <i class="icon-question-sign hint" data-hint="
                <?php echo $options_lang[$key][$key_option]->hint;?>">
            </i>
            <?php endif;?>
        </label>
        <?php
        if(isset($options_lang[$key][$key_option])){
            $drop_options = array_combine(explode(',',check_combine_set(isset($options_lang[$key])?$options_lang[$key][$key_option]->values:'', $val_option['values'], '')),explode(',',check_combine_set($val_option['values'], isset($options_lang[$key])?$options_lang[$key][$key_option]->values:'', '')));
        } else {
            $drop_options = array();
        }

        // If you don't want translation to website langauge uncomment this 1 line below:
        // $drop_options = array_combine(explode(',', $options_lang[$key][$key_option]->values), explode(',', $options_lang[$key][$key_option]->values));

        $drop_selected = set_value('option'.$val_option['id'].'_'.$key, isset($estate['option'.$val_option['id'].'_'.$key])?$estate['option'.$val_option['id'].'_'.$key]:'');
        echo form_dropdown ('option'.$val_option['id'].'_'.$key, $drop_options, $drop_selected, 'class="form-control" id="inputOption_'.$key.'_'.$val_option['id'].'" placeholder="'.$val_option['option'].'" '.$required_text)            
        ?>
    </div>undefined</div>
<?php endforeach;?>

Output

Thankyou

NOTE: My dropdown is inside a foreach

Answer 1

You should put your onchange prop into your form_dropdown function so your select option will have the event you want, submit while option changed.

<div class="col-lg-3">
    <label class="control-label">
        <?php echo $required_notice.$val_option['option']?>
        <?php if(!empty($options_lang[$key][$key_option]->hint)):?>
        <i class="icon-question-sign hint" data-hint="
            <?php echo $options_lang[$key][$key_option]->hint;?>">
        </i>
        <?php endif;?>
    </label>
    <?php
      if(isset($options_lang[$key][$key_option]))
          {
              $drop_options = array_combine(explode(',',check_combine_set(isset($options_lang[$key])?$options_lang[$key][$key_option]->values:'', $val_option['values'], '')),explode(',',check_combine_set($val_option['values'], isset($options_lang[$key])?$options_lang[$key][$key_option]->values:'', '')));
          }
      else
          {
              $drop_options = array();
          }

                  // If you don't want translation to website langauge uncomment this 1 line below:
                  // $drop_options = array_combine(explode(',', $options_lang[$key][$key_option]->values), explode(',', $options_lang[$key][$key_option]->values));

              $drop_selected = set_value('option'.$val_option['id'].'_'.$key, isset($estate['option'.$val_option['id'].'_'.$key])?$estate['option'.$val_option['id'].'_'.$key]:'');

              echo form_dropdown ('option'.$val_option['id'].'_'.$key, $drop_options, $drop_selected, 'onchange="this.form.submit()" class="form-control" id="inputOption_'.$key.'_'.$val_option['id'].'" placeholder="'.$val_option['option'].'" '.$required_text)

      ?>
</div>undefined</div>