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alvaroisorna on 06/30/06


Tagged

javascript png internetexplorer opacity prototypejs


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PNG Opacity support for Internet Explorer (simplified)

Published in: JavaScript 

first try to a crossbrowser support for png's opacity support

Plain TextExpand 
  1. //	this script have dependencies on prototype-1.4.0.js and Browser Detect Lite  v2.1
  2. //	http://prototype.conio.net/
  3. //	http://www.dithered.com/javascript/browser_detect/index.html
  4. //	(cc) alvaro isorna
  5.  
  6. Event.observe(window, 'load', function(){
  7. 	//	this will iterate with each element with the class 'ie-fix-opacity' and add an IE filter,
  8. 	//	replacing the background-image for the filter of that image
  9. 	document.getElementsByClassName('ie-fix-opacity').each(function(poElement){
  10. 		// if IE5.5+ on win32, then display PNGs with AlphaImageLoader
  11. 		if ((browser.isIE55 || browser.isIE6up) && browser.isWin32){
  12. 			var cBGImg = poElement.currentStyle.backgroundImage;
  13. 			var cImage = cBGImg.substring(cBGImg.indexOf('"') + 1, cBGImg.lastIndexOf('"'));
  14.  
  15. 			poElement.style.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(src='" + cImage + "', sizingMethod='scale')";
  16. 			poElement.style.backgroundImage = "none";
  17. 		}
  18. 	});
  19. }, false);

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