Detect when an iframe starts loading a new url

Philip:

How can I detect that an iframe on a page starts loading a new page?

Our situation is:

  • When the iFrame content starts changing, we need to show the "loading" animation and hide the search box.
  • I know how to handle the "iframe has finished loading" event (to hide the animation), but don't know how to capture the initial "begin change" event...

Note: I can attach a jquery "click" hook to the link on the menu and it will work. However, in the iframe content, there are many cross-reference links and the "change" event works on them too! So when the user clicks a link inside the iframe or changes the iframe src via JavaScript , we need to catch the event - as we also want to show the loading animation and hide the search box.

Bruce:

If the iframe and the container page are from the same origin, I found a better solution without having to put extra code in the inner page:

<iframe src="same-origin.com" onload="content_finished_loading(this)"></iframe>
<script>
    var indicator = document.querySelector('.loading-indicator');
    var content_start_loading = function() {
        indicator.style.display = 'block';
    };

    var content_finished_loading = function(iframe) {
        indicator.style.display = 'none';
        // inject the start loading handler when content finished loading
        iframe.contentWindow.onunload = content_start_loading;
    };
</script>

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