I am trying to pass a javascript over to a PHP variable by using AJAX. However, I am having a little bit of difficulty understanding Ajax, as I am new to it.

Here is my code:

    <form method="post">
        <select name="Class_Initial">
        <!-- dropdown data here -->

            $(document).ready(function() {
               $("#Change1").change(function() {
                   // This toggles the select tag
            var Class_Initial = $(this).find("option:selected").text();
                type: "POST",
                url: "my_ajax_obj.ajax_url",
                data: Class_Initial = Class_Initial,
                success: function(data) 
                     Class_Initial : Class_Initial 
    // How to tie var Class_Initial equal to $A
    $A = $_POST['Class_Initial'];

As a final note, I want to take the value of var Class_Initial and have it equal to a key in a query.


$wpdb->query("SELECT X from A Where X = 'Javascript_Value'");
  • it's probably not an AJAX issue and more basic variable usage, see this: url: "my_ajax_obj.ajax_url", instead of saying you want the URL to be the value of my_ajax_obj.ajax_url you've told it you want the URL to be literally the name of the variable, not its value: "my_ajax_obj.ajax_url"
    – Tom J Nowell
    Apr 28, 2023 at 17:00


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