Topic awaiting preservation: Calculating colors

Does anyone know how I can calculate colors in javascript? Suppose all my website colors are collected in one stylesheet. I want every row of my table to be a bit lighter then my background color, whatever that color may be. So I'm looking for something that can retrieve the background color of an element like a number and use it to calculate my new color?

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The calculation part looks ok for me, thanks alot. The only thing I (still) don't know is how do I get the background color of an element, knowing that this color is defined in a stylesheet? Which method/property or whatever do I use?

There are several ways to do this depending on the element type and browser.

The easiest way would be to give the element an "id" so you can refer to it through script easily. Then you can use:

document.getElementById("myElement").style.backgroundColor

Which is a readable and writable property, so you can use it to set the background colour too. Although for moust browsers you'll need to set the style inline (in the element's tag itself) or it will return a blank value from the above mentioned address unless you've perviously set it using that address.

There are ways of doing this if you don't want to set the style inline but they differ between browsers and for some (namely opera) it's just not possible.

That what you were after?



[This message has been edited by Dracusis (edited 10-29-2002).]

Added to FAQ:

How do I calculate colours with JavaScript?

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