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adammcintyre
06-10-2009, 11:58 AM
Hello there,

I have searched hi and low for help with this issue.

I would like a part of my sidebar to scroll, like the scrolling media player on http://www.trackitdown.net

I followed this tutorial on Net Tuts (http://net.tutsplus.com/tutorials/html-css-techniques/creating-a-floating-html-menu-using-jquery-and-css/)

It was insightful, however it makes a menu which scrolls constantly.

Is there a way to make a part of my blog/section/div etc, only begin to scroll down when the screen reaches a certain point? Like the one on TrackItDown (http://www.trackitdown.net)?

Any help massively appreciated! =)

Thanks folks!

vwphillips
06-10-2009, 05:59 PM
<!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>
<style type="text/css">
/*<![CDATA[*/
.tstp {
position:absolute;left:100px;top:100px;width:100px;height:900px;border:solid black 1px;
}

#tst {
position:absolute;left:0px;top:10px;width:100px;height:100px;background-Color:red;
}


/*]]>*/
</style>

<script type="text/javascript">
/*<![CDATA[*/
// Basic Element Animator (14-May-2009)
// by Vic Phillips http://www.vicsjavascripts.org.uk

// To progressively change the Left, Top, Width, Height or Opacity of an element over a specified period of time.
// With the ability to scale the effect time on specified minimum/maximum values
// and with three types of progression 'sin' and 'cos' and liner and an optional 'Bounce'.

// **** Application Notes

// **** The HTML Code
//
// when moving an element the inline or class rule style position of the element should be assigned as
// 'position:relative;' or 'position:absolute;'.
//
// The element would normally be assigned a unique ID name.
//

// **** Executing the Effect(Script)
//
// The effect is executed by an event call to function 'zxcBAnimator('width#',document.getElementById('tst'),10,800,5000,[10,800],'sin');'
// where:
// parameter 0 = the mode(see Note 2). (string)
// parameter 1 = the unique ID name or element object. (string or element object)
// parameter 2 = the start position of the effect. (digits, for opacity minimum 0, maximum 100)
// parameter 3 = the finish position of the effect. (digits, for opacity minimum 0, maximum 100)
// parameter 4 = (optional) period of time between the start and finish of the effect in milliseconds. (digits or defaults to 2000 milliSeconds)
// parameter 5 = (optional) to scale the effect time on a specified minimum/maximum. (array, see Note 5)
// field 0 the minimum. (digits)
// field 1 the maximum. (digits)
// parameter 6 = (optional) the type of progression, 'sin', 'cos' or 'liner'. (string, default = 'liner')
// 'sin' progression starts fast and ends slow.
// 'cos' progression starts slow and ends fast.
//
// Note 1: The default units(excepting opacity) are 'px'.
// Note 2: Examples modes: 'left', 'top', 'width', 'height', 'opacity.
// For hyphenated modes, the first character after the hyphen must be upper case, all others lower case.
// Note 3: To 'toggle' the effect include '#' in parameter 0.
// The first call will set the toggle parameters.
// Subsequent calls with '#' in parameter 0 and the same start and finish parameters will 'toggle' the effect.
// Note 4: The function may be re-executed with a different set of parameters (start/finish time or period)
// whenever required, say from an onclick/mouseover/out event.
// The period parameter will be retained unless re-specified.
// Note 5: parameter 5 is of particular use when re-calling the effect
// in mid travel to retain an constant rate of progression.
// Note 6: parameters 2 and 3 must be different values to execute the script.
//


// **** Functional Code - NO NEED to Change


function zxcBAnimator(mde,obj,srt,fin,ms,scale,curve){
if (typeof(obj)=='string'){ obj=document.getElementById(obj); }
if (!obj) return;
var oop=obj[mde.replace(/\W/g,'')+'oop'];
if (oop){
if (oop.srtfin[0]==srt&&oop.srtfin[1]==fin&&mde.match('#')) oop.update([oop.data[0],(oop.srtfin[0]==oop.data[2])?fin:srt],ms,scale,curve);
else oop.update([srt,fin],ms,scale,curve);
}
else oop=obj[mde.replace(/\W/g,'')+'oop']=new zxcBAnimatorOOP(mde,obj,srt,fin,ms,scale,curve);
return oop;
}

function zxcBAnimatorOOP(mde,obj,srt,fin,ms,scale,curve){
this.srtfin=[srt,fin];
this.to=null;
this.obj=obj;
this.mde=mde.replace(/\W/g,'');
this.update([srt,fin],ms,scale,curve);
}

zxcBAnimatorOOP.prototype.update=function(srtfin,ms,scale,curve){
clearTimeout(this.to);
this.time=ms||this.time||2000;
this.data=[srtfin[0],srtfin[0],srtfin[1]];
this.mS=this.time*(!scale?1:Math.abs((srtfin[1]-srtfin[0])/(scale[1]-scale[0])));
this.ms=this.mS;
this.curve=(typeof(curve)=='string')?curve.charAt(0).toLowerCase():(this.curve)?this.curve:'x';
this.inc=Math.PI/(2*this.mS);
this.srttime=new Date().getTime();
this.cng();
}

zxcBAnimatorOOP.prototype.cng=function(){
this.ms=new Date().getTime()-this.srttime;
this.data[0]=(this.curve=='s')?Math.floor((this.data[2]-this.data[1])*Math.sin(this.inc*this.ms)+this.data[1]):(this.curve=='c')?(this.data[2])-Math.floor((this.data[2]-this.data[1])*Math.cos(this.inc*this.ms)):(this.data[2]-this.data[1])/this.mS*this.ms+this.data[1];
this.apply();
if (this.ms<this.mS) this.to=setTimeout(function(oop){return function(){oop.cng();}}(this),10);
else {
this.data[0]=this.data[2];
this.apply();
if (this.Bounce&&this.Bounce[2]>0) this.bounce();
}
}

zxcBAnimatorOOP.prototype.apply=function(){
if (isFinite(this.data[0])){
if (this.mde!='left'&&this.mde!='top'&&this.data[0]<0) this.data[0]=0;
if (this.mde!='opacity') this.obj.style[this.mde]=this.data[0]+'px';
else zxcOpacity(this.obj,this.data[0]);
}
}

zxcBAnimatorOOP.prototype.bounce=function(){
if (this.Bounce[2]%2==0)
this.Bounce[1]+=(this.Bounce[0]-this.Bounce[1])/(this.Bounce[2])
this.update([this.data[0],this.Bounce[this.Bounce[2]%2==0?1:0]],this.Bounce[3]/this.Bounce[2]);
this.Bounce[2]--;
}

function zxcOpacity(obj,opc){
if (opc<0||opc>100) return;
obj.style.filter='alpha(opacity='+opc+')';
obj.style.opacity=obj.style.MozOpacity=obj.style.KhtmlOpacity=opc/100-.001;
}

/*]]>*/
</script>

<script type="text/javascript">
/*<![CDATA[*/
function Float(id,ms){
this.obj=document.getElementById(id);
this.parent=this.obj.parentNode
this.mm=[this.obj.offsetTop,this.parent.offsetHeight-this.obj.offsetHeight];
this.check();
this.top=zxcWWHS()[3];
this.ms=ms||1000;
}

Float.prototype.check=function(){
var oop=this,top=zxcWWHS()[3];
if (top==this.top){
var pos=Math.min(Math.max(top-zxcPos(this.parent)[1]+this.mm[0],this.mm[0]),this.mm[1]);
zxcBAnimator('top',this.obj,this.obj.offsetTop,pos,this.ms,this.mm);
setTimeout(function(){ oop.check(); },this.ms);
}
else {
this.top=top;
setTimeout(function(){ oop.check(); },200);
}
}

function zxcPos(obj){
var rtn=[obj.offsetLeft,obj.offsetTop];
while(obj.offsetParent!=null){
var objp=obj.offsetParent;
rtn[0]+=objp.offsetLeft;
rtn[1]+=objp.offsetTop;
obj=objp;
}
return rtn;
}


function zxcWWHS(){
if (window.innerHeight) return [window.innerWidth-10,window.innerHeight-10,window.pageXOffset,window.pageYOffset];
else if (document.documentElement.clientHeight) return [document.documentElement.clientWidth-10,document.documentElement.clientHeight-10,document.documentElement.scrollLeft,document.documentElement.scrollTop];
return [document.body.clientWidth,document.body.clientHeight,document.body.scrollLeft,document.body.scrollTop];
}

/*]]>*/
</script>

</head>

<body onload="F1=new Float('tst');">
<div class="tstp" >
<div id="tst" >tt</div>
</div>
<div style="height:5000px;" ></div>
</body>

</html>