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View Full Version : Adding fadeout to existing function



piers
06-26-2009, 02:34 PM
I'm using a script I've found that adds a bullet to links on a page:



<script type="text/javascript">

/***********************************************
* Bullet Link script- Dynamic Drive DHTML code library (www.dynamicdrive.com)
* This notice MUST stay intact for legal use
* Visit Dynamic Drive at http://www.dynamicdrive.com/ for full source code
***********************************************/

//Define your bullet image(s) via arbitrary variables, where bulletimg=["imagepath", imagewidth, offsetxfromroot, offsetyfromroot]
var bulletimg1=["pp_images/White_Orb.png", 10, 4, 0]
var bulletimg2=["pp_images/Blue_Orb.png", 10, 4, 8]

////Stop editting here/////////////////////
var classnameRE=/(^|\s+)ddbullet($|\s+)/i //regular expression to screen for classname within element

function caloffset(what, offsettype){
var totaloffset=(offsettype=="left")? what.offsetLeft : what.offsetTop;
var parentEl=what.offsetParent;
while (parentEl!=null){
totaloffset=(offsettype=="left")? totaloffset+parentEl.offsetLeft : totaloffset+parentEl.offsetTop;
parentEl=parentEl.offsetParent;
}
return totaloffset;
}

function displaybullet(linkobj){
var reltovar=window[linkobj.getAttribute("rel")]
bulletobj.setAttribute("src", reltovar[0])
bulletobj.style.left=caloffset(linkobj, "left")-reltovar[1]-reltovar[2]+"px"
bulletobj.style.top=caloffset(linkobj, "top")-reltovar[3]+"px"
bulletobj.style.visibility="visible"
}

function modifylinks(){
bulletobj=document.createElement("img")
bulletobj.setAttribute("id", "bulletimage")
bulletobj.className="bulletimagestyle"
document.body.appendChild(bulletobj)
for (i=0; i<document.links.length; i++){
if (typeof document.links[i].className=="string" && document.links[i].className.search(classnameRE)!=-1){
document.links[i].onmouseover=function(){displaybullet(this)}
document.links[i].onmouseout=function(){bulletobj.style.visibility="hidden"}
}
}
}

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

</script>


and what I'd love to do is add a function whereby the bullet fades out on mouseout.

I've tried injecting a simple fadeout function at the following line of the script above:


document.links[i].onmouseout=function(){bulletobj.style.visibility="hidden"

but it just breaks the script.

The function I tried to add was:


function setOpacity(level) {
element.style.opacity = level;
element.style.MozOpacity = level;
element.style.KhtmlOpacity = level;
element.style.filter = "alpha(opacity=" + (level * 100) + ");";
}
var duration = 1000;
var steps = 20;
var delay = 500;

function fadeOut() {
for (i = 0; i <= 1; i += (1 / steps)) {
setTimeout("setOpacity(" + (1 - i) + ")", i * duration);
}


And then tried to insert it:


document.links[i].onmouseout=function fadeOut()


But, probably because I'm clueless, I couldn't get it to work...

Does anyone have a better approach? Or see my glaring error..? :)

vwphillips
06-26-2009, 05:58 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>
<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.
//

// **** Advanced Applications
//
// Calling function 'zxcBAnimator' returns the instance of the script,
// this may be assigned to a variable and used to access the current value of the effect or to control the effect.
// alternatively the script instance by elementobject[mode.replace(/\W/g,'')+'oop'];
// where mode is parameter 0 of the initial call.
// An array storing the current, start and finish values of the element effect may be accessed
// from the element [instance].data as fields 0, 1 and 2 respectively where [instance] is the instance of the script.
//
// Once initialised the effect may be updated by calling function
// [instance].update([100,200])
// where:
// parameter 0 = an array defining the start and finish values. (array)
// field[0] =the start position of the effect. (digits, for opacity minimum 0, maximum 100)
// field[0] = the finish position of the effect. (digits, for opacity minimum 0, maximum 100)
// parameter 1 = (optional) period of time between the start and finish of the effect in milliseconds. (digits or defaults to 2000 milliSeconds)
// parameter 2 = (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 3 = (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.
//
// ** Bounce
// A 'bounce' effect may be applied by assigning the script instance property 'Bounce' an array
// defining the 'bounce' properties.
// e.g.
// [instance].Bounce=[100,90,4,200];
// where:
// field[0] = the 'bounce' maximum. (digits)
// field[1] = the 'bounce' minimum. (digits)
// field[2] = the number of bounces. (digits)
// field[3] = the 'bounce' duration. (digits)
//


// **** General
//
// Function names are prefixed with 'zxc' to minimise conflicts with other JavaScripts.
// These characters may be changed to characters of choice using global find and replace.
//
// The Functional Code, about 2.41K with 'bounce' and 'opacity' or 1.97K without is best as an External JavaScript.
//
// Tested with IE7 and Mozilla FireFox on a PC.
//

// **** 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 zxcBullet(cls){
var as=zxcByClassName(cls,null,'A')
for (var rel,oop,z0=0;z0<as.length;z0++){
rel=as[z0].getAttribute('rel');
if (rel){
oop=new zxcBOOP(as[z0],rel);
}
}
}

function zxcBOOP(obj,rel){
rel=rel.split(',');
this.img=zxcES('IMG',{position:'absolute',zIndex:'101',visibility:'hidden',width:rel[1]+'px'},document.body);
this.img.src=rel[0];
this.os=[rel[2]*1,rel[3]*1,rel[4]*1];
this.addevt(obj,'mouseover','ShowHide',true);
this.addevt(obj,'mouseout','ShowHide',false);
this.oop=zxcBAnimator('opacity',this.img,5,0,10);
this.obj=obj;
this.to=null;
}

zxcBOOP.prototype.ShowHide=function(e,ud){
clearTimeout(this.to);
zxcES(this.img,{visibility:'visible',left:zxcPos(this.obj)[0]+this.os[0]+'px',top:zxcPos(this.obj)[1]+this.os[1]+'px'});
this.oop.update([this.oop.data[0],ud?100:0],this.os[2]);
if (!ud){
var oop=this;
this.to=setTimeout(function(){ zxcES(oop.img,{visibility:'hidden'}); },this.os[2]);
}
}

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;
}


zxcBOOP.prototype.addevt=function(o,t,f,p){
var oop=this;
if (o.addEventListener) o.addEventListener(t,function(e){ return oop[f](e,p);}, false);
else if (o.attachEvent) o.attachEvent('on'+t,function(e){ return oop[f](e,p); });
else {
var prev=o['on'+t];
if (prev) o['on'+t]=function(e){ prev(e); oop[f](e,p); };
else o['on'+t]=o[f];
}
}

function zxcES(ele,style,par,txt){
if (typeof(ele)=='string') ele=document.createElement(ele);
for (key in style) ele.style[key]=style[key];
if (par) par.appendChild(ele);
if (txt) ele.appendChild(document.createTextNode(txt));
return ele;
}

function zxcByClassName(nme,el,tag){
if (typeof(el)=='string') el=document.getElementById(el);
el=el||document;
for (var tag=tag||'*',reg=new RegExp('\\b'+nme+'\\b'),els=el.getElementsByTagName(tag),ary=[],z0=0; z0<els.length;z0++){
if(reg.test(els[z0].className)) ary.push(els[z0]);
}
return ary;
}

/*]]>*/
</script>

</head>

<body onload="zxcBullet('bullet');">
<a href="http://dynamicdrive.com" class="bullet" rel="http://www.vicsjavascripts.org.uk/StdImages/One.gif,30,100,0,1000">Dynamic Drive</a></body>
<br />
<a href="http://dynamicdrive.com" class="bullet" rel="http://www.vicsjavascripts.org.uk/StdImages/Two.gif,30,100,0,1000">Dynamic Drive</a></body>
</form>

</html>

vwphillips
06-26-2009, 06:14 PM
or


<!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[*/

function zxcBullet(cls){
var as=zxcByClassName(cls,null,'A')
for (var rel,oop,z0=0;z0<as.length;z0++){
rel=as[z0].getAttribute('rel');
if (rel){
oop=new zxcBOOP(as[z0],rel);
}
}
}

function zxcBOOP(obj,rel){
rel=rel.split(',');
this.img=zxcES('IMG',{position:'absolute',zIndex:'101',visibility:'hidden',width:rel[1]+'px'},document.body);
this.img.src=rel[0];
this.os=[rel[2]*1,rel[3]*1,rel[4]*1];
this.addevt(obj,'mouseover','ShowHide',true);
this.addevt(obj,'mouseout','ShowHide',false);
this.obj=obj;
this.to=null;
}

zxcBOOP.prototype.ShowHide=function(e,ud){
clearTimeout(this.to);
zxcES(this.img,{visibility:'visible',left:zxcPos(this.obj)[0]+this.os[0]+'px',top:zxcPos(this.obj)[1]+this.os[1]+'px'});
this.cnt=100;
zxcOpacity(this.img,100)
if (!ud) this.opc();
}

zxcBOOP.prototype.opc=function(e,ud){
var oop=this;
zxcOpacity(this.img,this.cnt--);
if (this.cnt>0) this.to=setTimeout(function(){ oop.opc(); },this.ms);
else zxcES(oop.img,{visibility:'hidden'});
}

zxcBOOP.prototype.addevt=function(o,t,f,p){
var oop=this;
if (o.addEventListener) o.addEventListener(t,function(e){ return oop[f](e,p);}, false);
else if (o.attachEvent) o.attachEvent('on'+t,function(e){ return oop[f](e,p); });
else {
var prev=o['on'+t];
if (prev) o['on'+t]=function(e){ prev(e); oop[f](e,p); };
else o['on'+t]=o[f];
}
}

function zxcES(ele,style,par,txt){
if (typeof(ele)=='string') ele=document.createElement(ele);
for (key in style) ele.style[key]=style[key];
if (par) par.appendChild(ele);
if (txt) ele.appendChild(document.createTextNode(txt));
return ele;
}

function zxcByClassName(nme,el,tag){
if (typeof(el)=='string') el=document.getElementById(el);
el=el||document;
for (var tag=tag||'*',reg=new RegExp('\\b'+nme+'\\b'),els=el.getElementsByTagName(tag),ary=[],z0=0; z0<els.length;z0++){
if(reg.test(els[z0].className)) ary.push(els[z0]);
}
return ary;
}

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 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>

</head>

<body onload="zxcBullet('bullet');">
<a href="http://dynamicdrive.com" class="bullet" rel="http://www.vicsjavascripts.org.uk/StdImages/One.gif,30,100,0,10">Dynamic Drive</a></body>
<br />
<a href="http://dynamicdrive.com" class="bullet" rel="http://www.vicsjavascripts.org.uk/StdImages/Two.gif,30,100,0,150">Dynamic Drive</a></body>
</form>

</html>

piers
06-26-2009, 06:42 PM
Wow, Vic - that's amazing... thanks for helping me, and so quickly.

I'm gonna be checking out your site first thing in the am....

piers
06-27-2009, 04:28 AM
Vic, I've incorporated the second of your two scripts into my page and it's really starting to look great - thanks!

Just a couple of quick questions though :P

So far I can't quite figure out what the final value in


rel="http://www.vicsjavascripts.org.uk/StdImages/One.gif,30,100,0,10"

stands for (ie the "10")...

and I'm wondering if there's any way to easily adjust the rate of fade out - (if not, no big deal... it looks way cool).

I am noticing one oddity though: when the page loads there seems to be a slight over-height on the page content that produces a vertical scroll bar. After a few seconds it disappears (but with the corresponding jump in content position)... any ideas what might cause that? (it's not a major issue, perhaps, as I'm considering hiding all scrollbars with overflow:hidden anyway...)

Really appreciate your time and skills, thanks again.

piers
07-01-2009, 03:19 AM
Okay... I actually took the time to read your earlier post more carefully :p

I think I have it all figured out... thanks!

vwphillips
07-01-2009, 10:04 AM
<!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[*/
// rel="http://www.vicsjavascripts.org.uk/StdImages/One.gif,30,100,0,1"
// src, width, left, top, speed
function zxcBullet(cls){
var as=zxcByClassName(cls,null,'A')
for (var rel,oop,z0=0;z0<as.length;z0++){
rel=as[z0].getAttribute('rel');
if (rel){
oop=new zxcBOOP(as[z0],rel);
}
}
}

function zxcBOOP(obj,rel){
rel=rel.split(',');
this.img=zxcES('IMG',{position:'absolute',zIndex:'101',visibility:'hidden',width:rel[1]+'px'},document.body);
this.img.src=rel[0];
rel[4]=rel[4]||1;
this.os=[rel[2]*1,rel[3]*1,rel[4]*1];
this.addevt(obj,'mouseover','ShowHide',true);
this.addevt(obj,'mouseout','ShowHide',false);
this.obj=obj;
this.to=null;
}

zxcBOOP.prototype.ShowHide=function(e,ud){
clearTimeout(this.to);
zxcES(this.img,{visibility:'visible',left:zxcPos(this.obj)[0]+this.os[0]+'px',top:zxcPos(this.obj)[1]+this.os[1]+'px'});
this.cnt=100;
zxcOpacity(this.img,100)
if (!ud) this.opc();
}

zxcBOOP.prototype.opc=function(e,ud){
var oop=this;
zxcOpacity(this.img,(this.cnt-=this.os[2]));
if (this.cnt>0) this.to=setTimeout(function(){ oop.opc(); },10);
else zxcES(oop.img,{visibility:'hidden'});
}

zxcBOOP.prototype.addevt=function(o,t,f,p){
var oop=this;
if (o.addEventListener) o.addEventListener(t,function(e){ return oop[f](e,p);}, false);
else if (o.attachEvent) o.attachEvent('on'+t,function(e){ return oop[f](e,p); });
else {
var prev=o['on'+t];
if (prev) o['on'+t]=function(e){ prev(e); oop[f](e,p); };
else o['on'+t]=o[f];
}
}

function zxcES(ele,style,par,txt){
if (typeof(ele)=='string') ele=document.createElement(ele);
for (key in style) ele.style[key]=style[key];
if (par) par.appendChild(ele);
if (txt) ele.appendChild(document.createTextNode(txt));
return ele;
}

function zxcByClassName(nme,el,tag){
if (typeof(el)=='string') el=document.getElementById(el);
el=el||document;
for (var tag=tag||'*',reg=new RegExp('\\b'+nme+'\\b'),els=el.getElementsByTagName(tag),ary=[],z0=0; z0<els.length;z0++){
if(reg.test(els[z0].className)) ary.push(els[z0]);
}
return ary;
}

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 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>

</head>

<body onload="zxcBullet('bullet');">
<a href="http://dynamicdrive.com" class="bullet" rel="http://www.vicsjavascripts.org.uk/StdImages/One.gif,30,100,0,.5">Dynamic Drive</a></body>
<br />
<a href="http://dynamicdrive.com" class="bullet" rel="http://www.vicsjavascripts.org.uk/StdImages/Two.gif,30,100,0,4">Dynamic Drive</a></body>
</form>

</html>

piers
07-01-2009, 11:52 AM
Excellent... thx :)



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