92 lines
4.5 KiB
JavaScript
92 lines
4.5 KiB
JavaScript
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//Style Sheet Switcher version 1.1 Oct 10th, 2006
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//Author: Dynamic Drive: http://www.dynamicdrive.com
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//Usage terms: http://www.dynamicdrive.com/notice.htm
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var manual_or_random="manual" //"manual" or "random"
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var randomsetting="3 days" //"eachtime", "sessiononly", or "x days (replace x with desired integer)". Only applicable if mode is random.
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//////No need to edit beyond here//////////////
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function getCookie(Name) {
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var re=new RegExp(Name+"=[^;]+", "i"); //construct RE to search for target name/value pair
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if (document.cookie.match(re)) //if cookie found
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return document.cookie.match(re)[0].split("=")[1] //return its value
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return null
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}
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function setCookie(name, value, days) {
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var expireDate = new Date()
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//set "expstring" to either future or past date, to set or delete cookie, respectively
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var expstring=(typeof days!="undefined")? expireDate.setDate(expireDate.getDate()+parseInt(days)) : expireDate.setDate(expireDate.getDate()-5)
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document.cookie = name+"="+value+"; expires="+expireDate.toGMTString()+"; path=/";
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}
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function deleteCookie(name){
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setCookie(name, "moot")
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}
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function setStylesheet(title, randomize){ //Main stylesheet switcher function. Second parameter if defined causes a random alternate stylesheet (including none) to be enabled
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var i, cacheobj, altsheets=[""]
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for(i=0; (cacheobj=document.getElementsByTagName("link")[i]); i++) {
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if(cacheobj.getAttribute("rel").toLowerCase()=="alternate stylesheet" && cacheobj.getAttribute("title")) { //if this is an alternate stylesheet with title
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cacheobj.disabled = true
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altsheets.push(cacheobj) //store reference to alt stylesheets inside array
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if(cacheobj.getAttribute("title") == title) //enable alternate stylesheet with title that matches parameter
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cacheobj.disabled = false //enable chosen style sheet
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}
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}
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if (typeof randomize!="undefined"){ //if second paramter is defined, randomly enable an alt style sheet (includes non)
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var randomnumber=Math.floor(Math.random()*altsheets.length)
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altsheets[randomnumber].disabled=false
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}
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return (typeof randomize!="undefined" && altsheets[randomnumber]!="")? altsheets[randomnumber].getAttribute("title") : "" //if in "random" mode, return "title" of randomly enabled alt stylesheet
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}
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function chooseStyle(styletitle, days){ //Interface function to switch style sheets plus save "title" attr of selected stylesheet to cookie
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if (document.getElementById){
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setStylesheet(styletitle)
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setCookie("mysheet", styletitle, days)
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}
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}
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function indicateSelected(element){ //Optional function that shows which style sheet is currently selected within group of radio buttons or select menu
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if (selectedtitle!=null && (element.type==undefined || element.type=="select-one")){ //if element is a radio button or select menu
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var element=(element.type=="select-one") ? element.options : element
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for (var i=0; i<element.length; i++){
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if (element[i].value==selectedtitle){ //if match found between form element value and cookie value
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if (element[i].tagName=="OPTION") //if this is a select menu
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element[i].selected=true
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else //else if it's a radio button
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element[i].checked=true
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break
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}
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}
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}
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}
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if (manual_or_random=="manual"){ //IF MANUAL MODE
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var selectedtitle=getCookie("mysheet")
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if (document.getElementById && selectedtitle!=null) //load user chosen style sheet from cookie if there is one stored
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setStylesheet(selectedtitle)
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}
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else if (manual_or_random=="random"){ //IF AUTO RANDOM MODE
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if (randomsetting=="eachtime")
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setStylesheet("", "random")
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else if (randomsetting=="sessiononly"){ //if "sessiononly" setting
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if (getCookie("mysheet_s")==null) //if "mysheet_s" session cookie is empty
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document.cookie="mysheet_s="+setStylesheet("", "random")+"; path=/" //activate random alt stylesheet while remembering its "title" value
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else
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setStylesheet(getCookie("mysheet_s")) //just activate random alt stylesheet stored in cookie
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}
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else if (randomsetting.search(/^[1-9]+ days/i)!=-1){ //if "x days" setting
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if (getCookie("mysheet_r")==null || parseInt(getCookie("mysheet_r_days"))!=parseInt(randomsetting)){ //if "mysheet_r" cookie is empty or admin has changed number of days to persist in "x days" variable
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setCookie("mysheet_r", setStylesheet("", "random"), parseInt(randomsetting)) //activate random alt stylesheet while remembering its "title" value
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setCookie("mysheet_r_days", randomsetting, parseInt(randomsetting)) //Also remember the number of days to persist per the "x days" variable
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}
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else
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setStylesheet(getCookie("mysheet_r")) //just activate random alt stylesheet stored in cookie
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}
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}
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;
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