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styleswitcher.js by Paul Sowden

/ Published in: JavaScript
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  1. function setActiveStyleSheet(title) {
  2.   var i, a, main;
  3.   for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
  4.     if(a.getAttribute("rel") && a.getAttribute("rel").indexOf("style") != -1 && a.getAttribute("title")) {
  5.       a.disabled = true;
  6.       if(a.getAttribute("title") == title) a.disabled = false;
  7.     }
  8.   }
  9. }
  10.  
  11. function getActiveStyleSheet() {
  12.   var i, a;
  13.   for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
  14.     if(a.getAttribute("rel") && a.getAttribute("rel").indexOf("style") != -1 && a.getAttribute("title") && !a.disabled) return a.getAttribute("title");
  15.   }
  16.   return null;
  17. }
  18.  
  19. function getPreferredStyleSheet() {
  20.   var i, a;
  21.   for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
  22.     if(a.getAttribute("rel") && a.getAttribute("rel").indexOf("style") != -1
  23.        && a.getAttribute("rel").indexOf("alt") == -1
  24.        && a.getAttribute("title")
  25.        ) return a.getAttribute("title");
  26.   }
  27.   return null;
  28. }
  29.  
  30. function createCookie(name,value,days) {
  31.   if (days) {
  32.     var date = new Date();
  33.     date.setTime(date.getTime()+(days*24*60*60*1000));
  34.     var expires = "; expires="+date.toGMTString();
  35.   }
  36.   else expires = "";
  37.   document.cookie = name+"="+value+expires+"; path=/";
  38. }
  39.  
  40. function readCookie(name) {
  41.   var nameEQ = name + "=";
  42.   var ca = document.cookie.split(';');
  43.   for(var i=0;i < ca.length;i++) {
  44.     var c = ca[i];
  45.     while (c.charAt(0)==' ') c = c.substring(1,c.length);
  46.     if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
  47.   }
  48.   return null;
  49. }
  50.  
  51. window.onload = function(e) {
  52.   var cookie = readCookie("style");
  53.   var title = cookie ? cookie : getPreferredStyleSheet();
  54.   setActiveStyleSheet(title);
  55. }
  56.  
  57. window.onunload = function(e) {
  58.   var title = getActiveStyleSheet();
  59.   createCookie("style", title, 365);
  60. }
  61.  
  62. var cookie = readCookie("style");
  63. var title = cookie ? cookie : getPreferredStyleSheet();
  64. setActiveStyleSheet(title);

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