Help with Drop Down/ Overlapping Content script

**qwikad.com** · 01-09-2014, 11:36 PM

It says there that the drop down can be positioned in 4 different ways: "left-bottom", "right-bottom", "left-top", and "right-top"

Is there a way to center it? Something like "center-bottom"?

http://www.dynamicdrive.com/dynamici...lapcontent.htm

Thanks.

**vwphillips** · 01-10-2014, 11:23 AM

see red lines

Code:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">

<head>
  <title></title>
<script type="text/javascript">
/*<![CDATA[*/
//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):subobj.dropposition[0]=="center"?(anchorobj.offsetWidth-subobj.offsetWidth)/2 : 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)}
	}
}
/*]]>*/
</script></head>

<body>






<!--Example #2: -->

<p align="center" style="margin-top: 400px">Demo #2 (click): <a href="http://www.dynamicdrive.com/resources/" id="contentlink" rel="subcontent2">Additional Resources</a> </p>

<p align="center" style="margin-top: 400px">Demo #3 (click): <a href="http://www.dynamicdrive.com/resources/" id="contentlink3" rel="subcontent3">Additional Resources</a> </p>

<DIV id="subcontent2" style="position:absolute; visibility: hidden; border: 9px solid black; background-color: lightyellow; width: 350px; height: 120px; padding: 4px;">

<div style="width: 49%; float: left">
<ul>
<li><a href="http://www.dynamicdrive.com">Dynamic Drive</li>
<li><a href="http://www.javascriptkit.com">JavaScript Kit</li>
<li><a href="http://www.cssdrive.com">CSS Drive</li>
<li><a href="http://www.codingforums.com">Coding Forums</li>
</ul>
</div>

<div style="width: 49%; float: left">
<ul>
<li><a href="http://www.cnn.com">CNN</li>
<li><a href="http://www.msnbc.com">MSNBC</li>
<li><a href="http://www.news.bbc.co.uk">BBC News</li>
<li><a href="http://www.slashdot.org">Slashdot</li>
</ul>
</div>

<div align="right"><a href="javascript:dropdowncontent.hidediv('subcontent2')">Hide this DIV manually</a></div>

</DIV>

<DIV id="subcontent3" style="position:absolute; visibility: hidden; border: 9px solid black; background-color: lightyellow; width: 350px; height: 120px; padding: 4px;">

<div style="width: 49%; float: left">
<ul>
<li><a href="http://www.dynamicdrive.com">Dynamic Drive</li>
<li><a href="http://www.javascriptkit.com">JavaScript Kit</li>
<li><a href="http://www.cssdrive.com">CSS Drive</li>
<li><a href="http://www.codingforums.com">Coding Forums</li>
</ul>
</div>

<div style="width: 49%; float: left">
<ul>
<li><a href="http://www.cnn.com">CNN</li>
<li><a href="http://www.msnbc.com">MSNBC</li>
<li><a href="http://www.news.bbc.co.uk">BBC News</li>
<li><a href="http://www.slashdot.org">Slashdot</li>
</ul>
</div>

<div align="right"><a href="javascript:dropdowncontent.hidediv('subcontent2')">Hide this DIV manually</a></div>

</DIV>

<script type="text/javascript">
//Call dropdowncontent.init("anchorID", "positionString", glideduration, "revealBehavior") at the end of the page:

dropdowncontent.init("searchlink", "right-bottom", 500, "mouseover")
dropdowncontent.init("contentlink", "left-top", 300, "click")
dropdowncontent.init("contentlink3", "center-top", 300, "click")

</script>
</body>

</html>

**qwikad.com** · 01-10-2014, 01:37 PM

Did you test it? I tried it just now and it is not centering it.

**vwphillips** · 01-10-2014, 04:31 PM

there are two on the page

Code:

dropdowncontent.init("contentlink", "left-top", 300, "click")
dropdowncontent.init("contentlink3", "center-top", 300, "click")

the second(the lower link on the page) one is "center-top" and has been tested with IE and FF

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