Simple ajax call to dynamically load page content, solving issues of page caching etc.


    var post_data = {
               'action': 'my_ajax_action_callback',   //The name of the ajax callback action in functions.php
               'my_value_1': 'AjaxTest'
    };, post_data, function(response) {
      document.getElementById( 'ajax_output1' ).innerHTML = response;

  <div id='ajax_output1'></div>
AJAX Callback
//********** AJAX CALLBACK **********
add_action ( 'wp_ajax_my_ajax_action_callback', 'my_ajax_action_callback' );        //For AJAX calls made for logged in users
add_action ( 'wp_ajax_nopriv_my_ajax_action_callback', 'my_ajax_action_callback' ); //For AJAX calls made from non logged in users
function my_ajax_action_callback()
  $my_value_1 = '';
  if (isset($_POST['my_value_1']))
    $my_value_1 = $_POST['my_value_1'];
  $ReturnHtml = "HELLO: " . $my_value_1;
  echo ($ReturnHtml);
  wp_die();     //Terminate immediately and return a proper response
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