Team:Imperial College London/dropdowncontent

From 2011.igem.org

//Drop Down/ Overlapping Content: http://www.dynamicdrive.com //**Updated: Dec 19th, 07': Added ability to dynamically populate a Drop Down content using an external file (Ajax feature) //**Updated: Feb 29th, 08': //1) Added ability to reveal drop down content via "click" of anchor link (instead of default "mouseover") //2) Added ability to disable drop down content from auto hiding when mouse rolls out of it //3) Added hidediv(id) public function to directly hide drop down div dynamically

//**Updated: Sept 11th, 08': Fixed bug whereby drop down content isn't revealed onClick of anchor in Safari/ Google Chrome //**Updated: April 9th, 10': Minor change

var dropdowncontent={ disableanchorlink: true, //when user clicks on anchor link, should link itself be disabled (always true if "revealbehavior" above set to "click")

hidedivmouseout: [true, 200], //Set hiding behavior within Drop Down DIV itself: [hide_div_onmouseover?, miliseconds_before_hiding]

ajaxloadingmsg: "Loading content. Please wait...", //HTML to show while ajax page is being feched, if applicable ajaxbustcache: true, //Bust cache when fetching Ajax pages?

getposOffset:function(what, offsettype){ return (what.offsetParent)? what[offsettype]+this.getposOffset(what.offsetParent, offsettype) : what[offsettype] },

isContained:function(m, e){ var e=window.event || e var c=e.relatedTarget || ((e.type=="mouseover")? e.fromElement : e.toElement) while (c && c!=m)try {c=c.parentNode} catch(e){c=m} if (c==m) return true else return false },

show:function(anchorobj, subobj, e){ if (!this.isContained(anchorobj, e) || (e && e.type=="click")){ var e=window.event || e if (e.type=="click" && subobj.style.visibility=="visible"){ subobj.style.visibility="hidden" return } var horizontaloffset=(subobj.dropposition[0]=="left")? -(subobj.offsetWidth-anchorobj.offsetWidth) : 0 //calculate user added horizontal offset var verticaloffset=(subobj.dropposition[1]=="top")? -subobj.offsetHeight : anchorobj.offsetHeight //calculate user added vertical offset subobj.style.left=this.getposOffset(anchorobj, "offsetLeft") + horizontaloffset + "px" subobj.style.top=this.getposOffset(anchorobj, "offsetTop")+verticaloffset+"px" subobj.style.clip=(subobj.dropposition[1]=="top")? "rect(auto auto auto 0)" : "rect(0 auto 0 0)" //hide drop down box initially via clipping subobj.style.visibility="visible" subobj.startTime=new Date().getTime() subobj.contentheight=parseInt(subobj.offsetHeight) if (typeof window["hidetimer_"+subobj.id]!="undefined") //clear timer that hides drop down box? clearTimeout(window["hidetimer_"+subobj.id]) this.slideengine(subobj, (subobj.dropposition[1]=="top")? "up" : "down") } },

curveincrement:function(percent){ return (1-Math.cos(percent*Math.PI)) / 2 //return cos curve based value from a percentage input },

slideengine:function(obj, direction){ var elapsed=new Date().getTime()-obj.startTime //get time animation has run if (elapsed<obj.glidetime){ //if time run is less than specified length var distancepercent=(direction=="down")? this.curveincrement(elapsed/obj.glidetime) : 1-this.curveincrement(elapsed/obj.glidetime) var currentclip=(distancepercent*obj.contentheight)+"px" obj.style.clip=(direction=="down")? "rect(0 auto "+currentclip+" 0)" : "rect("+currentclip+" auto auto 0)" window["glidetimer_"+obj.id]=setTimeout(function(){dropdowncontent.slideengine(obj, direction)}, 10) } else{ //if animation finished obj.style.clip="rect(0 auto auto 0)" } },

hide:function(activeobj, subobj, e){ if (!dropdowncontent.isContained(activeobj, e)){ window["hidetimer_"+subobj.id]=setTimeout(function(){ subobj.style.visibility="hidden" subobj.style.left=subobj.style.top=0 clearTimeout(window["glidetimer_"+subobj.id]) }, dropdowncontent.hidedivmouseout[1]) } },

hidediv:function(subobjid){ document.getElementById(subobjid).style.visibility="hidden" },

ajaxconnect:function(pageurl, divId){ var page_request = false var bustcacheparameter="" if (window.XMLHttpRequest) // if Mozilla, IE7, Safari etc page_request = new XMLHttpRequest() else if (window.ActiveXObject){ // if IE6 or below try { page_request = new ActiveXObject("Msxml2.XMLHTTP") } catch (e){ try{ page_request = new ActiveXObject("Microsoft.XMLHTTP") } catch (e){} } } else return false document.getElementById(divId).innerHTML=this.ajaxloadingmsg //Display "fetching page message" page_request.onreadystatechange=function(){dropdowncontent.loadpage(page_request, divId)} if (this.ajaxbustcache) //if bust caching of external page bustcacheparameter=(pageurl.indexOf("?")!=-1)? "&"+new Date().getTime() : "?"+new Date().getTime() page_request.open('GET', pageurl+bustcacheparameter, true) page_request.send(null) },

loadpage:function(page_request, divId){ if (page_request.readyState == 4 && (page_request.status==200 || window.location.href.indexOf("http")==-1)){ document.getElementById(divId).innerHTML=page_request.responseText } },

init:function(anchorid, pos, glidetime, revealbehavior){

var anchorobj=document.getElementById(anchorid) if (anchorobj) var subobj=document.getElementById(anchorobj.getAttribute("rel")) if (!anchorobj || !subobj) return var subobjsource=anchorobj.getAttribute("rev") if (subobjsource!=null && subobjsource!="") this.ajaxconnect(subobjsource, anchorobj.getAttribute("rel")) subobj.dropposition=pos.split("-") subobj.glidetime=glidetime || 1000 subobj.style.left=subobj.style.top=0 if (typeof revealbehavior=="undefined" || revealbehavior=="mouseover"){ anchorobj.onmouseover=function(e){dropdowncontent.show(this, subobj, e)} anchorobj.onmouseout=function(e){dropdowncontent.hide(subobj, subobj, e)} if (this.disableanchorlink) anchorobj.onclick=function(){return false} } else anchorobj.onclick=function(e){dropdowncontent.show(this, subobj, e); return false} if (this.hidedivmouseout[0]==true) //hide drop down DIV when mouse rolls out of it? subobj.onmouseout=function(e){dropdowncontent.hide(this, subobj, e)} } }