What are the reasons behind the failure of this Javascript code in IE7-8?

Here is the code snippet I am working with:

window.addEvent('domready', function() {

  var li_list = document.getElementById("topmenu").getElementsByTagName("li");

  for (var i=0; i<li_list.length; i++) {

      li_list[i].onmouseover=function() {
          this.className+=" hover";
      }

      li_list[i].onmouseout=function() {
          this.className=this.className.replace(new RegExp(" hover\\b"), "");
      }
  }
})

However, I am running into an issue in IE7-8 where it fails with the message "document.getElementById(...) is null or not an object."

The code works perfectly fine in Firefox.

This problem directly impacts the functionality of the main menu on my website:

Your help on resolving this issue would be greatly appreciated. Thank you!

javascriptinternet-explorer

Answer №1

It has been observed that on Internet Explorer, domready event can be triggered before the document object model is fully ready. For more information, refer to this informative post.

Consequently, when your code is executed, the document object may not yet be available, resulting in an error message like "document.getElementById(...) is null or not an object."

The recommended solution is to utilize a toolkit (such as jQuery, yui, etc) that can provide a reliable alternative for handling the domready event, compatible with Internet Explorer and other browsers.

Answer №2

Why not give this a shot as an alternative option? Keep in mind that it may only be compatible with Internet Explorer.

document.attachEvent( "onreadystatechange", function() {
    if ( document.readyState === "complete" ) {
        // dom ready
    }
});

Answer №3

Utilize jquery for seamless cross-browser functionality as they have already put in the effort to make it work smoothly.

$(document).ready(function() {
// execute some tasks here
});

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