lib/pkp/js/sizer.js

   1 /**
   2  * sizer.js
   3  *
   4  * Copyright (c) 2000-2009 John Willinsky
   5  * Distributed under the GNU GPL v2. For full terms see the file docs/COPYING.
   6  *
   7  * Font sizer JavaScript functions.
   8  *
   9  * $Id: sizer.js,v 1.4 2009/04/08 21:34:54 asmecher Exp $
  10  */
  11
  12 function getStylesheets() {
  13         var linkNodes, styleNodes, x, sheets = [];
  14         if (!window.ScriptEngine && navigator.__ice_version ) {
  15                 return document.styleSheets;
  16         }
  17         if (document.getElementsByTagName) {
  18                 linkNodes = document.getElementsByTagName('link');
  19                 styleNodes = document.getElementsByTagName('style');
  20         } else if (document.styleSheets && document.all) {
  21                 linkNodes = document.all.tags('LINK');
  22                 styleNodes = document.all.tags('STYLE');
  23         } else {
  24                 return [];
  25         }
  26         for (x = 0; linkNodes[x]; x++) {
  27                 var rel = linkNodes[x].rel ? linkNodes[x].rel : linkNodes[x].getAttribute ? linkNodes[x].getAttribute('rel') : '';
  28                 if (typeof(rel) == 'string' && rel.toLowerCase().indexOf('style') != -1) {
  29                         sheets[sheets.length] = linkNodes[x];
  30                 }
  31         }
  32         for (x = 0; styleNodes[x]; x++) {
  33                 var rel = styleNodes[x].rel ? styleNodes[x].rel : styleNodes[x].getAttribute ? styleNodes[x].getAttribute('rel') : '';
  34                 if (typeof(rel) == 'string' && rel.toLowerCase().indexOf('style') != -1) {
  35                         sheets[sheets.length] = styleNodes[x];
  36                 }
  37         }
  38         return sheets;
  39 }
  40
  41 /**
  42  * Set the font size to the named stylesheet.
  43  * Thanks to www.alistsapart.com for the basic design.
  44  */
  45 function setFontSize(size) {
  46         var s = getStylesheets();
  47         for (var i=0; i < s.length; i++) {
  48                 if (s[i].getAttribute("rel").indexOf("style") != -1 && s[i].getAttribute("title")) {
  49                         s[i].disabled = true;
  50                         if(s[i].getAttribute("title") == size) s[i].disabled = false;
  51                 }
  52         }
  53 }
  54
  55 /**
  56  * Get the current font size.
  57  * Thanks to www.alistapart.com for the basic design.
  58  */
  59 function getFontSize() {
  60         var s = getStylesheets();
  61         for (var i=0; i < s.length; i++) {
  62                 if(s[i].getAttribute("rel").indexOf("style") != -1 && s[i].getAttribute("title") && !s[i].disabled) return s[i].getAttribute("title");
  63         }
  64         return null;
  65 }
  66
  67 function getPreferredFontSize() {
  68         var s = getStylesheets();
  69         for (var i=0; i < s.length; i++) {
  70                 if(s[i].getAttribute("rel").indexOf("style") != -1 && s[i].getAttribute("rel").indexOf("alt") == -1 && s[i].getAttribute("title")) return s[i].getAttribute("title");
  71         }
  72         return null;
  73 }
  74
  75 window.onload = function(e) {
  76         var cookie = readCookie("font-size");
  77         var size = cookie ? cookie : getPreferredFontSize();
  78         setFontSize(size);
  79 }
  80
  81 window.onunload = function(e) {
  82         var size = getFontSize();
  83         createCookie("font-size", size, 365);
  84 }