Wednesday, December 30, 2009

Recipe 9.4 Keeping Background Images Stationary in Internet Explorer 6 for Windows











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Recipe 9.4 Keeping Background Images Stationary in Internet Explorer 6 for Windows







Problem





You want to have a fixed background image in





Internet Explorer 6 for Windows.









Solution





Use the following

JavaScript hack to force the effect.

First copy the following code to call up the JavaScript code in your

web page:





<head>

<script type="text/javascript" src="fixed.js"></script>

</head>







Then in the fixed.js file place the JavaScript

code for the workaround, which can be found at this book's online

sample archive http://www.oreilly.com/catalog/cssckbk/ or

from Andrew Clover's site at http://doxdesk.com/software/js/fixed.html.









Discussion





According to the CSS 2 specification, when a background image is

fixed using the background-attachment

property, it shouldn't move when the user scrolls

the web page. In all versions of Internet Explorer for Windows, this

property doesn't work at all.





However, this stunning JavaScript workaround developed by Andrew

Clover fixes this problem by simply adding the JavaScript link to the

web page. The JavaScript works by dynamically recalculating the

position of the viewport as a user scrolls, and then it adjusts the

background image accordingly.









See Also





Recipe 2.7 for more information about

setting a fixed background image; the CSS specification for

background-attachment at http://www.w3.org/TR/CSS21/colors.html#propdef-background-attachment.



















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