PDA

View Full Version : JavaScript image effect.



auriaks
03-09-2010, 05:45 PM
hi,

I want to make nice icon effect with JavaScript. Firstly, the icon is grey, but when you took your mouse over it, in 5 seconds it will fade to its real colors.

It becomes grey again, when you put your mouse away. (also in 5 seconds)
(I will use that Icon as a button)

Can someone help me with this? Thanks. :)

auriaks
03-11-2010, 10:27 PM
Or maybe it will be easier with jQuery?? Like when mouseon - image will fadeout, mouseout - fadein as it was...

BLiZZaRD
03-12-2010, 12:14 AM
You will need the images, and a way to change them on hover. Have a look at this menu example (http://www.cssplay.co.uk/menus/flickerfree_mk3.html) for ways to do that.

You will need JavaScript to do the timing though. Or Flash. I will look into the JS for timed events though while you wait. :)

<edit>
Here is a JS example of using setTimeOut.. you can combine the two to get what you need.



<script type="text/javascript">

function setToRed ( )
{
document.getElementById("colourButton").style.color = "#FF0000";
setTimeout ( "setToBlack()", 2000 );
}

function setToBlack ( )
{
document.getElementById("colourButton").style.color = "#000000";
}

</script>

<input type="button" name="clickMe" id="colourButton" value="Click me and wait!" onclick="setToRed()"/>

vwphillips
03-12-2010, 10:51 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>
<style type="text/css">
/*<![CDATA[*/
.fade {
position:relative;width:115px;height:86px;
}

.fade IMG{
position:absolute;left:0px;top:0px;
}
/*]]>*/
</style>

</head>

<body>
<div class="fade" >
<img src="http://www.cssplay.co.uk/menus/../toys/toy1.jpg" />
<img src="http://www.cssplay.co.uk/menus/../toys/toy1_bw.jpg" />
</div>
<div class="fade" >
<img src="http://www.cssplay.co.uk/menus/../toys/toy2.jpg" />
<img src="http://www.cssplay.co.uk/menus/../toys/toy2_bw.jpg" />
</div>
<script type="text/javascript">
// Animate (11-January-2010)
// 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.

// **** 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.
//

// **** Initialising the Script.
//
// The script is initialised by assigning an instance of the script to a variable.
// e.g A = new zxcAnimate('left','id1')
// where:
// A = a global variable (variable)
// parameter 0 = the mode(see Note 1). (string)
// parameter 1 = the unique ID name or element object. (string or element object)
// parameter 1 = the initial value. (digits, default = 0)

// **** Executing the Effect
//
// The effect is executed by an event call to function 'A.animate(10,800 ,5000,[10,800]);'
// where:
// A = the global referencing the script instance. (variable)
// parameter 0 = the start value. (digits, for opacity minimum 0, maximum 100)
// parameter 1 = the finish value. (digits, for opacity minimum 0, maximum 100)
// parameter 2 = period of time between the start and finish of the effect in milliseconds. (digits or defaults to previous or 0(on first call) milliSeconds)
// parameter 3 = (optional) to scale the effect time on a specified minimum/maximum. (array, see Note 3)
// field 0 the minimum value. (digits)
// field 1 the maximum value. (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.
//
// Note 1: Examples modes: 'left', 'top', 'width', 'height', 'opacity.
// Note 2: The default units(excepting opacity) are 'px'.
// For hyphenated modes, the first character after the hyphen must be upper case, all others lower case.
// Note 3: The scale is of particular use when re-calling the effect
// in mid progression to retain an constant rate of progression.
// Note 4: The current effect value is recorded in A.data[0].
// Note 5: A function may be called on completion of the effect by assigning the function
// to the animator intance property .Complete.
// e.g. [instance].Complete=function(){ alert(this.data[0]); };
//



// **** Functional Code(1.58K) - NO NEED to Change

function zxcAnimate(mde,obj,srt){
this.to=null;
this.obj=typeof(obj)=='object'?obj:document.getElementById(obj);
this.mde=mde.replace(/\W/g,'');
this.data=[srt||0];
return this;
}

zxcAnimate.prototype.animate=function(srt,fin,ms,scale,c){
clearTimeout(this.to);
this.time=ms||this.time||0;
this.neg=srt<0||fin<0;
this.data=[srt,srt,fin];
this.mS=this.time*(!scale?1:Math.abs((fin-srt)/(scale[1]-scale[0])));
this.c=typeof(c)=='string'?c.charAt(0).toLowerCase():this.c?this.c:'';
this.inc=Math.PI/(2*this.mS);
this.srttime=new Date().getTime();
this.cng();
}

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

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

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 FadeImg(cls,ms){
var objs=zxcByClassName(cls);
for (var z0=0;z0<objs.length;z0++){
new Fade(objs[z0],ms);
}

}

function Fade(obj,ms){
var imgs=obj.getElementsByTagName('IMG');
imgs[0].style.zIndex='0';
imgs[1].style.zIndex='1';
this.img=new zxcAnimate('opacity',imgs[0],0);
this.img.Complete=function(){
if (this.data[0]==0){
this.obj.style.zIndex='0';
}
}
this.addevt(obj,'mouseover','Fade');
this.addevt(obj,'mouseout','Fade');
this.ms=ms||1000;
}

Fade.prototype.Fade=function(e){
this.img.obj.style.zIndex='2';
this.img.animate(this.img.data[0],e.type=='mouseover'?100:0,this.ms,[0,100]);
}


Fade.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 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;
}

FadeImg('fade',5000);
/*]]>*/
</script>
</body>

</html>

auriaks
03-12-2010, 07:15 PM
Vic :) two forums - same problem :D Good work... Thanks for your time.