javascript - DOM : How to detect a new child elements?

Question

I want to detect the insertion of a new div element only as a direct child of the parent div.

Example:

<div id="parent">
    <div id="child1"></div>
    <div id="child2"></div>
    <div id="newChild">I want this element to be detected</div>
</div>

The DOMNodeInserted() event is not a solution for me because it is triggered on every element insertion, not just children.

Like:

<div id="parent">
    <div id="child1">
        <span>I don't want this new element to be detected</span>
    </div>
    <div id="child2"></div>
    <div id="child3"></div>
</div>

Answer 1

Use DOMNodeInserted on the parent and check the event.target.parentNode of the added element. If its id is parent, then the element is a direct descendant.

Demo: http://jsfiddle.net/ThinkingStiff/f2w7V/

document.getElementById( 'parent' ).addEventListener( 'DOMNodeInserted', function ( event ) {

    if( event.target.parentNode.id == 'parent' ) {
        //direct descendant        
    };

}, false );