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Vertical Content Scroller script

Lets take a look now at the completed code for the scroller, with the script added in that scrolls the absolutely positioned DIV upwards before restarting when it has scrolled its entire height:

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<style type="text/css">

#marqueecontainer{
position: relative;
width: 200px; /*marquee width */
height: 200px; /*marquee height */
background-color: white;
overflow: hidden;
border: 3px solid orange;
padding: 2px;
padding-left: 4px;
}

</style>

<script type="text/javascript">

/***********************************************
* Cross browser Marquee II- Dynamic Drive (www.dynamicdrive.com)
* This notice MUST stay intact for legal use
* Visit http://www.dynamicdrive.com/ for this script and 100s more.
***********************************************/

var delayb4scroll=2000 //Specify initial delay before marquee starts to scroll on page (2000=2 seconds)
var marqueespeed=2 //Specify marquee scroll speed (larger is faster 1-10)
var pauseit=1 //Pause marquee onMousever (0=no. 1=yes)?

////NO NEED TO EDIT BELOW THIS LINE////////////

var copyspeed=marqueespeed
var pausespeed=(pauseit==0)? copyspeed: 0
var actualheight=''

function scrollmarquee(){
if (parseInt(cross_marquee.style.top)>(actualheight*(-1)+8)) //if scroller hasn't reached the end of its height
cross_marquee.style.top=parseInt(cross_marquee.style.top)-copyspeed+"px" //move scroller upwards
else //else, reset to original position
cross_marquee.style.top=parseInt(marqueeheight)+8+"px"
}

function initializemarquee(){
cross_marquee=document.getElementById("vmarquee")
cross_marquee.style.top=0
marqueeheight=document.getElementById("marqueecontainer").offsetHeight
actualheight=cross_marquee.offsetHeight //height of marquee content (much of which is hidden from view)
if (window.opera || navigator.userAgent.indexOf("Netscape/7")!=-1){ //if Opera or Netscape 7x, add scrollbars to scroll and exit
cross_marquee.style.height=marqueeheight+"px"
cross_marquee.style.overflow="scroll"
return
}
setTimeout('lefttime=setInterval("scrollmarquee()",30)', delayb4scroll)
}

if (window.addEventListener)
window.addEventListener("load", initializemarquee, false)
else if (window.attachEvent)
window.attachEvent("onload", initializemarquee)
else if (document.getElementById)
window.onload=initializemarquee


</script>


<div id="marqueecontainer" onMouseover="copyspeed=pausespeed" onMouseout="copyspeed=marqueespeed">
<div id="vmarquee" style="position: absolute; width: 98%;">

<!--YOUR SCROLL CONTENT HERE-->

<h4>Your scroller contents</h4>

<!--YOUR SCROLL CONTENT HERE-->

</div>
</div>

Our content DIV (ID="vmarquee") is originally positioned at (0, 0) within the container DIV (ID="marqueecontainer"). I use a script to incrementally move the content DIV upwards until it's travelled its total height, calculated using:

actualheight=cross_marquee.offsetHeight

Once it has, the DIV is reset back to (0, 0), and the whole process repeats. Refer to the comments inside script to follow the logic.

And there you have it, a cross browser content scroller that's easy to update and search engine friendly.

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