Working with JavaScript and making AJAX calls to interact with PHP backend

Having trouble with this code, it's not working as expected. I want to pass the value when I select an option from the dropdown menu, process the data using onChange event and display the value in the tag.

<label for="headmark" class="lbl-ui select">
    <select id="headmark" name="headmark" onChange="getVal(this)">                                
    <?php while (oci_fetch($headmark_parse)){?>                                                                                     
        <option value="<?php echo $head_mark ?>" id="headmark"> 
        <?php echo "$head_mark"; ?></option> 
        <?php } ?>
    </select>
</label>  

<script type="text/javascript">
       function getVal(val){
              $.ajax( {
              type: 'POST',
              url: update_fab_progress.php,
              data: "&val=" + val, 
              success: function(data) {
                        alert("data");
              }
          } );
       }
</script>
<?php
     echo $_POST['val'];
?>

Answer №1

To debug effectively, utilize the chrome developer tool for assistance. It seems that the parameter 'val' you are using in your JavaScript code is behaving oddly. Perhaps you are sending a request with an empty parameter.

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