jquery - Chrome-extension Javascript to detect dynamically-loaded content

Question

I'm implementing a chrome extension app. I want to replace href attribute in tag (on my webapp's homepage) with "#". The problem is that the tag might be dynamically loaded by ajax, and could be reloaded by user actions. Any suggestions on how to let chrome-extension detect ajax loaded html content?

Answer 1

There are two ways to do it,

First solution is handling the ajax requests

There is a .ajaxComplete() function in jQuery which handles all ajax request on page.

In content script,

var actualCode = '(' + function() {
    $(document).ajaxComplete(function() { 
      alert('content has just been changed, you should change href tag again');
      // chaging href tag code will be here      
    });
} + ')();';
var script = document.createElement('script');
script.textContent = actualCode;
(document.head||document.documentElement).appendChild(script);
script.parentNode.removeChild(script);

Second solution is listening the content changes

This is possible with mutation events, again in content script

$(document).bind("DOMSubtreeModified", function() {
    alert("something has been changed on page, you should update href tag");
});

You might use some different selector to restrict the elements that you're controling the changes.

$("body").bind("DOMSubtreeModified", function() {}); // just listen changes on body content

$("#mydiv").bind("DOMSubtreeModified", function() {}); // just listen changes on #mydiv content