Setting top and left CSS attributes

For some reason I'm unable to set the "top" and "left" CSS attribute开发者_开发问答s using the following JavaScript.

var div = document.createElement('div');
div.style.position = 'absolute';
div.style.top = 200;
div.style.left = 200;
document.body.appendChild(div);

Using Firebug I can see that the div gets the position set to "absolute" but the top and left attributes are not set!

This is for Firefox 3.6.

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Your problem is that the top and left properties require a unit of measure, not just a bare number:

div.style.top = "200px";
div.style.left = "200px";

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You can also use the setProperty method like below

document.getElementById('divName').style.setProperty("top", "100px");

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div.style yields an object (CSSStyleDeclaration). Since it's an object, you can alternatively use the following:

div.style["top"] = "200px";
div.style["left"] = "200px";

This is useful, for example, if you need to access a "variable" property:

div.style[prop] = "200px";

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We can create a new CSS class for div.

 .div {
      position: absolute;
      left: 150px;
      width: 200px;
      height: 120px;
    }