execute javascript code after loading ajax content

Although this question may have been asked before, I am completely unfamiliar with the subject and unable to apply the existing answers. Despite following tutorials for every script on my page, I have encountered a problem. Specifically, I have a section where I load content from an external HTML file using AJAX (following this tutorial: https://www.youtube.com/watch?v=dmfZp4iFzOs). However, I need to run a JavaScript function after loading each content snippet, but the script executes before the content is actually loaded.

Here's an example of the HTML structure:

<body>    
    <ul>
        <li><a class="menu" href="1.html">1</a></li>
        <li><a class="menu" href="2.html">2</a></li>
        <li><a class="menu" href="3.html">3</a></li>
    </ul>
    <div id="content_area"></div>
    <script src="menu.js"></script>
</body>

The menu.js file:

$('.menu').click(function(){
    var href = $(this).attr('href');
    $('#content_area').hide().load(href).fadeIn('normal');
    return false;
});

The external HTML file is complex, but I need to execute the following script each time a menu item is clicked and loaded:

var init = function() {
  var box1 = document.querySelector('.container1').children[0],
      showPanelButtons = document.querySelectorAll('#show-buttons button'),
      panelClassName = 'show-front',

      onButtonClick = function( event ){
        box1.removeClassName( panelClassName );
        panelClassName = event.target.className;
        box1.addClassName( panelClassName );
      };

  for (var i=0, len = showPanelButtons.length; i < len; i++) {
    showPanelButtons[i].addEventListener( 'click', onButtonClick, false);
  }

  document.getElementById('toggle-backface-visibility').addEventListener( 'click', function(){
    box1.toggleClassName('panels-backface-invisible');
  }, false);

};

window.addEventListener( 'DOMContentLoaded', init, false); 

Apologies for any language errors in my communication. Any help would be greatly appreciated. Thank you!

Answer №1

When using jQuery's .load() function, keep in mind that it operates asynchronously. This means that the function will "return" before it finishes its task. To handle this, you should provide a callback function that will be executed once the operation is complete. Here's an example:

$('#content_area').hide().load(href, function () {
    init();
    $('#content_area').fadeIn('normal');
});

It's important to note a few things about this code snippet:

  1. The .fadeIn() method is also placed inside the callback function to ensure that the element is only faded in after its content has been loaded.
  2. Both functions are enclosed within a single anonymous function () {}. This function serves as a parameter for the .load() function and will be called once the loading process is done.

Answer №2

Opt for utilizing a callback function within jQuery's load() method instead of the traditional "window.addEventListener( 'DOMContentLoaded', init, false);" approach.

$('#content_section').hide().load(href, initialize).fadeIn('normal');

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