/*********************************************************************************************** Script to swap between stylesheets Written by Mark Wilton-Jones, 05/12/2002. v2.2.1 updated 14/03/2006 for dynamic stylesheets ************************************************************************************************ Please see http://www.howtocreate.co.uk/jslibs/ for details and a demo of this script Please see http://www.howtocreate.co.uk/jslibs/termsOfUse.html for terms of use To set up the page in the first place: Inbetween the <head> tags, put: <script src="PATH TO SCRIPT/swapstyle.js" type="text/javascript" language="javascript1.2"></script> Also between the head tags, put your stylesheets, best done as external links, but you can use <style ...> tags as well. Stylesheets cannot be switched if they have no title attribute and will be used at all times: <link rel="stylesheet" type="text/css" href="all.css"> Stylesheets will be on by default if they have a title attribute and their rel attribute is set to 'stylesheet'. Most browsers will only allow one of these to be defined (or several sharing the same title): <link rel="stylesheet" type="text/css" href="default.css" title="Default"> Stylesheets will be off by default if they have a title attribute and their rel attribute is set to 'alternate stylesheet': <link rel="alternate stylesheet" type="text/css" href="contrast.css" title="High Contrast"> <link rel="alternate stylesheet" type="text/css" href="bigFont.css" title="Big Font"> To swap between stylesheets: changeStyle(); //switches off all stylesheets that have title attributes changeStyle('Default'); //switches off all stylesheets that have title attributes that do not match 'Default' changeStyle('High Contrast'); //switches off all stylesheets that have title attributes that do not match 'High Contrast' changeStyle('Big Font'); //switches off all stylesheets that have title attributes that do not match 'Big Font' changeStyle('High Contrast','Big Font'); //switches off all stylesheets that have title attributes that do not match 'High Contrast' or 'Big Font' Opera 7+ and Mozilla also allow users to switch between stylesheets using the view menu (only one at a time though ...) To make the script remember the user's choice of stylesheets, for example to use on more than one page or if they reload - includes stylesheets chosen using the view menu in Gecko - it will only attempt to store a cookie if they actually changed something: In these examples, I call the cookie used to store the choice 'styleTestStore'. You could use any name you like. To remember only until the browser window is closed: <body onload="useStyleAgain('styleTestStore');" onunload="rememberStyle('styleTestStore');"> To remember for 10 days (for example): <body onload="useStyleAgain('styleTestStore');" onunload="rememberStyle('styleTestStore',10);"> Note that some browsers (most notably Opera) do not fire the onunload event when the page is reloaded, and will only fire it when the user clicks a link or submits a form. If you need the style preference to be stored even when reloading, you should call rememberStyle immediately after you call changeStyle. If you are going to provide users with a mechanism to change stylesheets, you may want to check if the browser will allow you to change stylesheets first. Use: if( document.styleSheets || ( window.opera && document.childNodes ) || ( window.ScriptEngine && ScriptEngine().indexOf('InScript') + 1 && document.createElement ) ) { document.write('Something that allows them to choose stylesheets'); } It's not perfect, because it will also appear in ICEbrowser, which makes a mess when it tries to change to an alternate stylesheet. If you want, you can use if( ( document.styleSheets || ( window.opera && document.childNodes ) || ( window.ScriptEngine && ScriptEngine().indexOf('InScript') + 1 && document.createElement ) ) && !navigator.__ice_version ) { but you should then update that if ICE is updated to make it work properly. ________________________________________________________________________________________________*/ function getAllSheets() { if( !window.ScriptEngine && navigator.__ice_version ) { return document.styleSheets; } if( document.getElementsByTagName ) { var Lt = document.getElementsByTagName('link'), St = document.getElementsByTagName('style'); } else if( document.styleSheets && document.all ) { var Lt = document.all.tags('LINK'), St = document.all.tags('STYLE'); } else { return []; } for( var x = 0, os = []; Lt[x]; x++ ) { var rel = Lt[x].rel ? Lt[x].rel : Lt[x].getAttribute ? Lt[x].getAttribute('rel') : ''; if( typeof( rel ) == 'string' && rel.toLowerCase().indexOf('style') + 1 ) { os[os.length] = Lt[x]; } } for( var x = 0; St[x]; x++ ) { os[os.length] = St[x]; } return os; } function changeStyle() { window.userHasChosen = window.MWJss; for( var x = 0, ss = getAllSheets(); ss[x]; x++ ) { if( ss[x].title ) { ss[x].disabled = true; } for( var y = 0; y < arguments.length; y++ ) { if( ss[x].title == arguments[y] ) { ss[x].disabled = false; } } } } function rememberStyle( cookieName, cookieLife ) { for( var viewUsed = false, ss = getAllSheets(), x = 0; window.MWJss && MWJss[x] && ss[x]; x++ ) { if( ss[x].disabled != MWJss[x] ) { viewUsed = true; break; } } if( !window.userHasChosen && !viewUsed ) { return; } for( var x = 0, outLine = '', doneYet = []; ss[x]; x++ ) { if( ss[x].title && ss[x].disabled == false && !doneYet[ss[x].title] ) { doneYet[ss[x].title] = true; outLine += ( outLine ? ' MWJ ' : '' ) + escape( ss[x].title ); } } if( ss.length ) { document.cookie = escape( cookieName ) + '=' + escape( outLine ) + ( cookieLife ? ';expires=' + new Date( ( new Date() ).getTime() + ( cookieLife * 86400000 ) ).toGMTString() : '' ) + ';path=/'; } } function useStyleAgain( cookieName ) { for( var x = 0; x < document.cookie.split( "; " ).length; x++ ) { var oneCookie = document.cookie.split( "; " )[x].split( "=" ); if( oneCookie[0] == escape( cookieName ) ) { var styleStrings = unescape( oneCookie[1] ).split( " MWJ " ); for( var y = 0, funcStr = ''; styleStrings[y]; y++ ) { funcStr += ( y ? ',' : '' ) + 'unescape( styleStrings[' + y + '] )'; } eval( 'changeStyle(' + funcStr + ');' ); break; } } window.MWJss = []; for( var ss = getAllSheets(), x = 0; ss[x]; x++ ) { MWJss[x] = ss[x].disabled; } }