Simple style switcher - tutorial

422 · November 2011

Thought I would create a thread for this, feel free to use however you wish.

Please test this locally , you will need to create index.html page add this code to the head


<link href="css/main.css" rel="stylesheet" type="text/css" title="main" media="screen" />
<link href="css/alt1.css" rel="alternate stylesheet" type="text/css" title="alt1" media="screen" />
<link href="css/alt2.css" rel="alternate stylesheet" type="text/css" title="alt2" media="screen" /> 
<script type="text/javascript" src="js/styleswitcher.js"></script>

In the body of the index page add this code:


 <a href="javascript:;" 
onclick="setActiveStyleSheet('main'); 
return false;">change style to default</a>

<a href="javascript:;" 
onclick="setActiveStyleSheet('alt1'); 
return false;">Alternate style 1</a>

<a href="javascript:;" 
onclick="setActiveStyleSheet('alt2'); 
return false;">Alternate style 2</a>

Create a folder called css and one called js

In the css folder create 3 files. alt1.css , alt2.css and main.css ( create different css for each of these files and save )

in the js folder create a file called styleswitcher.js

in that file add this code.


function setActiveStyleSheet(title) {
  var i, a, main;
  for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
    if(a.getAttribute("rel").indexOf("style") != -1 && a.getAttribute("title")) {
      a.disabled = true;
      if(a.getAttribute("title") == title) a.disabled = false;
    }
  }
}

function getActiveStyleSheet() {
  var i, a;
  for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
    if(a.getAttribute("rel").indexOf("style") != -1 && a.getAttribute("title") && !a.disabled) return a.getAttribute("title");
  }
  return null;
}

function getPreferredStyleSheet() {
  var i, a;
  for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
    if(a.getAttribute("rel").indexOf("style") != -1
       && a.getAttribute("rel").indexOf("alt") == -1
       && a.getAttribute("title")
       ) return a.getAttribute("title");
  }
  return null;
}

function createCookie(name,value,days) {
  if (days) {
    var date = new Date();
    date.setTime(date.getTime()+(days*24*60*60*1000));
    var expires = "; expires="+date.toGMTString();
  }
  else expires = "";
  document.cookie = name+"="+value+expires+"; path=/";
}

function readCookie(name) {
  var nameEQ = name + "=";
  var ca = document.cookie.split(';');
  for(var i=0;i < ca.length;i++) {
    var c = ca[i];
    while (c.charAt(0)==' ') c = c.substring(1,c.length);
    if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
  }
  return null;
}

window.onload = function(e) {
  var cookie = readCookie("style");
  var title = cookie ? cookie : getPreferredStyleSheet();
  setActiveStyleSheet(title);
}

window.onunload = function(e) {
  var title = getActiveStyleSheet();
  createCookie("style", title, 365);
}

var cookie = readCookie("style");
var title = cookie ? cookie : getPreferredStyleSheet();
setActiveStyleSheet(title);

Now add some content to your index.html page, that will be styled. And test it out. With a little help you can make this work with your forums I am sure ( i havent checked the code but should be simple enough )

x00 · November 2011

another approach is to use jquery extension.

http://vanillaforums.org/discussion/comment/146120#Comment_146120

Simple style switcher - tutorial

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