Question

I want to add an element after every “like” button (chrome extension). Since posts are added to the news feed without refreshing the page, I have to add an event listener “DOMNodeInserted“. But when I try to put the after() function inside it, it doesn’t work.

Code:

    $("#contentArea").addEventListener("DOMNodeInserted", function(event) {
        $(".like_link").after('<span class="dot"> · </span><button class="taheles_link stat_elem as_link" title="תגיד תכל&acute;ס" type="submit" name="taheles" onclick="apply_taheles()" data-ft="{&quot;tn&quot;:&quot;&gt;&quot;,&quot;type&quot;:22}"><span class="taheles_default_message">תכל&acute;ס</span><span class="taheles_saving_message">לא תכלס</span></button>');
        $(".taheles_saving_message").hide(); 
    });

When I change $("#contentArea") to document it crashes all the page.

Answer 1

if you want to add an event listener in jQuery, that is not the method, the corect way should always be:

$(document or window).bind( your_event_name, function(event) { your_callback });

with this in mind, you can write:

$(document).bind('DOMNodeInserted', function(event) {

    alert('inserted ' + event.target.nodeName + // new node
          ' in ' + event.relatedNode.nodeName); // parent

});

or do what you need to perform every time a node is inserted in the DOM.

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for your information, if you want to use addEventListener you need to use plain javascript and not jQuery.

document.addEventListener("DOMNodeInserted", function () {
    // your code
}, false);

Edit: As on jQuery 1.7, please use the ‘.on’ function instead: http://api.jquery.com/on/

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another error that comes up of your method (if it worked) is that you will break your application as you are inserting a node and call the DOMNodeInserted (cause you have inserted a node) and that will insert the node again, and call the DOMNodeInserted again…

you can see what is going on …

I would suggest that you listen to the correct method and append your span there…