Change HTML element by ID

Possible Duplicate:
Change an element's CSS class with JavaScript

Found lot of topics about this topic, but none helped me. I have:

<div id="text-6" class="block col-228">

Javascript code should add new class fit, so result should be:

<div id="text-6" class="block col-228 fit">

How to do that with javascript?

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Try like this:

var elem = document.getElementById("text-6");
elem.setAttribute("class", elem.getAttribute("class")+" fit");

Important note: You need to be assure,that your DOM Hierarchy is constructed completely,then try to manipulate DOM Element s. That is why you need to put DOM manipulation scripts inside of the window.onload callback, or if you use jQuery , then inside of $(document).ready callback.

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您在脚本标记之间放置以下内容。

document.getElementById('text-6').className += " fit";

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I'd recommend using jQuery. Then you can just do something like this:

$("#text-6").addClass("fit");

EDIT:

Including the whole jQuery library may be overkill for your situation, but if you're dealing with DOM manipulation a lot, jQuery can simplify things quite a bit. If it's just for this one thing, then some of the other answers provided would be better.

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