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This JavaScript code example displays a JavaScript swimming fish in your browser window. When the fish hits a wall he 'turns' around and goes the other way.

This JavaScript swimming fish script is very easy to setup and it works perfectly on modern browsers such as Opera, Firefox, Chrome, Safari.

And you can also change the picture of fish by others if you want easily. But this is swimming fish animation, you may check JavaScript Swimming Fish Backgrounder if you need background swimming fish JavaScript effect.

Label: JavaScript swimming fish, swimming fish script, download javascript swimming fish, web swimming fish, HTML swimming fish, background swimming fish, swimming fish balloon

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<script type=text/javsacript>
var speed=50;                         // SPEED OF ANIMATION IN MILLISECONDS.
var change=5000;                   // MAX TIME BETWEEN DIRECTION CHANGES IN MILLISECONDS. 
var xmax=5;                             // MAX NUMBER OF PIXEL STEPS LEFT OR RIGHT.        
var ymax=3;                             // MAX NUMBER OF PIXEL STEPS UP OR DOWN.
var fishRurl="fish_right.gif";   // THE URL OF THE RIGHT-FACING FISH
var fishLurl="fish_left.gif";      // THE URL OF THE LEFT-FACING FISH

var w3c=(document.getElementById)?true:false;
var ns4=(document.layers)?true:false;
var ie4=(document.all && !w3c)?true:false;
var ie5=(document.all && w3c)?true:false;
var ns6=(w3c && navigator.appName.indexOf("Netscape")>=0)?true:false;
var w_x, w_y, bothfish,pich,picw;
var incrx=Math.floor(Math.random()*xmax);
var incry=Math.floor(Math.random()*ymax);
var xdir=true;
var ydir=true;
var imagex=new Image(); imagex.src=fishLurl;
var t=(ns4)? '<layer name="bothfish" top="-100" left="0">' : '<div id="bothfish" style="position:absolute; top:0px; left;0px; width:1px; height:1px">'; 
t+='<img src="'+fishRurl+'" border="0" name="fishpic">';
t+=(ns4)?'</layer>':'</div>';
document.write(t);

function getid(id){
if(ns4) return document.layers[id];
else if(ie4)return document.all[id];
else return document.getElementById(id);
}

function moveidto(id,x,y){
if(ns4)id.moveTo(x,y);
else{
id.style.left=x+'px';
id.style.top=y+'px';
}}

function moveidby(id,x,y){
if(ns4)id.moveBy(x,y);
else{
id.style.left=parseInt(id.style.left)+x+'px';
id.style.top=parseInt(id.style.top)+y+'px';
}}

function getwindowsize(){
if(ie4||ie5){
w_x=document.body.clientWidth;
w_y=document.body.clientHeight;
}else{
w_x=window.innerWidth-15;
w_y=window.innerHeight-15;
}}

function changedirs(){
if(Math.floor(Math.random()*5)>2)xdir=(Math.floor(Math.random()*2)==0);
if(Math.floor(Math.random()*5)>2)ydir=(Math.floor(Math.random()*2)==0);
if(Math.floor(Math.random()*5)>2)incrx=Math.floor(Math.random()*xmax);
if(Math.floor(Math.random()*5)>2)incry=Math.floor(Math.random()*ymax);
checkdirs();
setTimeout('changedirs()',Math.ceil(Math.random()*change));
}

function checkdirs(){
if(xdir) (ns4)? bothfish.document.images["fishpic"].src=fishRurl:document.images["fishpic"].src=fishRurl;
else (ns4)? bothfish.document.images["fishpic"].src=fishLurl:document.images["fishpic"].src=fishLurl;
}

function animate(){
tx=(ns4)?bothfish.left:parseInt(bothfish.style.left);
ty=(ns4)?bothfish.top:parseInt(bothfish.style.top);
if(ie4||ie5){
xo=document.body.scrollLeft;
yo=document.body.scrollTop;
}else{
xo=window.pageXOffset;
yo=window.pageYOffset;
}
if(ydir) if((ty+incry+pich)>(w_y+yo)){ydir=false; checkdirs(); moveidby(bothfish,0,-incry);}else{ moveidby(bothfish,0,incry); }
else if((ty-incry)<yo){ ydir=true; checkdirs(); moveidby(bothfish,0,incry); }else{ moveidby(bothfish,0,-incry); }
if(xdir) if((tx+incrx+picw)>(w_x+xo)){ xdir=false; checkdirs(); moveidby(bothfish,-incrx,0); }else{ moveidby(bothfish,incrx,0); }
else if((tx-incrx)<xo){ xdir=true; checkdirs(); moveidby(bothfish,incrx,0); }else{ moveidby(bothfish,-incrx,0); }
}

window.onresize=function(){
if(ns4)setTimeout('history.go(0)',400);
else getwindowsize();
}

window.onload=function(){
bothfish=getid('bothfish');
if(ns4){
picw=bothfish.document.images['fishpic'].width;
pich=bothfish.document.images['fishpic'].height;
}else{
picw=document.images['fishpic'].width;
pich=document.images['fishpic'].height;
}
getwindowsize();
moveidto(bothfish,(w_x-picw)/2,(w_y-pich)/2);
setInterval('animate()',speed);
changedirs();
}
</script>
	<!--
    	This script downloaded from www.JavaScriptBank.com
    	Come to view and download over 2000+ free javascript at www.JavaScriptBank.com
	-->

Comment (1)
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by Cao Phong, 11/12/2012 07:12 AM
thank Jason for alerting Reply

I updated the image URLs, more options about the fish with

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30/01/2007
Brian Gosselin [more]
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JavaScript Swimming Fish

3/5 1 votes / 12,410 previews / 1 comment 30/01/2007 This JavaScript code example displays a JavaScript swimming fish in your browser window. When the fish h...JavaScript Swimming Fish - JavaScript Swimming Fish

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