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POHow to extend DOM Element as a Class (without jQuery)
 

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  1. POHow to extend DOM Element as a Class (without jQuery)
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    <blockquote> <p><strong>Possible Duplicate:</strong><br> <a href="https://stackoverflow.com/questions/779880/in-javascript-can-you-extend-the-dom">In Javascript, can you extend the DOM?</a> </p> </blockquote> <p>I'm trying to add methods and properties to the Element. It is not listed as a global class. I can extend String like this:</p> <pre><code>String.prototype.dosomething = function { ... }; </code></pre> <p>I try like this (it's bigger, this is the basic):</p> <pre><code>function $id(str){ this.element = document.getElementById(str); return element; } var myElem = $id('myId'); // WORKS !!! $id.prototype.dosomethig = function ( ... }; var myValue = $id('myId').dosomething(); // DOESN'T WORK !!! </code></pre> <p>I try in other ways but the point it's always the same, when I try to extend the class, it doesn't work. Is there a way to avoid this? I know jQuery do this, but I want to do my onwn - if they can, I can... right?</p> <p>Edit: Below a code already working in Safari and Firefox...</p> <pre><code>Element.prototype.pos = function(){ var curleft = this.offsetLeft; var curtop = this.offsetTop; var scrleft = this.scrollLeft; var scrtop = this.scrollTop; var pElement = pElementScr = this.offsetParent while(pElement){ curleft += pElement.offsetLeft; curtop += pElement.offsetTop; pElement = pElement.offsetParent; } while(pElementScr){ scrleft += pElementScr.scrollLeft; scrtop += pElementScr.scrollTop; pElementScr = pElementScr.offsetParent; } return {x:this.offsetLeft, y:this.offsetTop}; } </code></pre> <p>It gives the position of a div even inner of a lot of other divs. I'll try to test in IE8, after solve a lot of other issues of my library.</p>
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    1. COYou should read http://perfectionkills.com/whats-wrong-with-extending-the-dom/
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    2. COAFAIK, jQuery does not do this. They provide a wrapper, but avoid touching the DOM prototypes.
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