The omission of form field values is causing the Auto POST Form on Interval to be incomplete

There is a script that functions correctly when a button is clicked to submit the form. However, when I change the form to automatically post on an interval, the values in the form fields are not included in the submission.
I believe this issue is related to using the closest(form) method as the button relies on it for reference, whereas auto posting on an interval does not have this reference point. Any assistance would be greatly appreciated. Please note that my form is within a SQL while loop.

A) The script when activated by a button. B) The script when set to auto-post at intervals.

The form

<form  class="updateform"  action="" method="">
<input type="hidden" class="customerid" name="" value="<?php echo $customerid?>">
<a   class ="test">test</a>
<div class="update"></div>
</form>

** A)**

<script>
$(document).ready(function(){
    $('.test').click(function(event){
       event.preventDefault();
 
        var form = $(this).closest("form");
        var field1= form.find('.customerid').val();
   
        // URL and field data to be posted          
        $.post('/test4.php', {customerid:field1},
        
         // Alert Success
         function(data){
      form.find('.update').html(data);
            
        });
    });
});
</script>  

** B)**

<script>
$(function() {
 var form = $(this).closest("form");
 var field1= $('.customerid').val();
  function update() {
      $.post("/test4.php",  {customerid:field1},
      function(data){
        $('.update').html(data); 
    });
  }
  setInterval(update, 3000);
  update();

});
</script>

Answer №1

The reason for the issue could be attributed to the utilization of the .closest() method in the second script. This attempts to pinpoint the form element closest to the current context which might either refer to the function scope or the window object. Consider adjusting it to a jQuery selector so you can accurately target the desired form.

You have the ability to validate this independently by employing console.log or utilizing the debugger statement to inspect the element values within the browser's developer tools. Familiarize yourself with these tools as they are invaluable resources, even for seasoned developers.

If I may offer a suggestion, consider prefixing your jQuery elements (those selected with $('element')) with a $. This labeling helps indicate the type of value contained in the variable. Additionally, implementing meaningful names for variables significantly enhances readability and comprehension. For instance, field1 is ambiguous, whereas customerIdField provides clarity about its purpose.

$(function() {
  var $form = $('form.updateform');
  var $updateField = $form.find('.update')
  var $customerIdField = form.find('.customerid');
  var customerIdValue = $customerIdField.val();
  function update() {
    $.post("/test4.php",  {customerid: customerIdValue}, function(data) {
      $updateField.html(data); 
    });
  }
  setInterval(update, 3000);
  update();
});

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