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I would like to change the variable of an object with a slider. For example, I have an object with variable zoom, how would I add a slider function to the script to change this variable? I am a little confused about event handling. Any help would be much appreciated.
I am posting the code (which actually was done by one of this forum's members) in case it may make understanding/explanation simpler.
I am posting the code (which actually was done by one of this forum's members) in case it may make understanding/explanation simpler.
Code:
<!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[*/
.tstparent {
position:relative;overflow:hidden;left:50px;top:50px;width:800px;height:500px;border:solid red 1px;
}
#tst {
position:relative;left:0px;top:0px;width:700px;height:500px;
}
.window {
width:200px;height:150px;border:solid white 2px;
}
/*]]>*/
</style>
<script type="text/javascript">
/*<![CDATA[*/
// Zoom Image (28-August-2011)
// by Vic Phillips http://www.vicsjavascripts.org.uk/
function zxcZoomImage(o){
var img = document.getElementById(o.ID);
var obj = img.parentNode;
var window = document.createElement('DIV');
var zimg = document.createElement('IMG');
var src = o.ZoomSRC;
var zoom = o.Zoom;
zoom = typeof(zoom)=='number'?zoom:2;
var os=o.ZoomWindowOffset;
window.style.position = 'absolute';
window.style.overflow = 'hidden';
window.style.visibility = 'hidden';
window.style.zIndex= '2' ;
window.className = o.WindowClassName;
zimg.style.position = 'absolute';
zimg.style.width = img.width*zoom+'px';
zimg.style.height = img.height*zoom+'px';
zimg.src = typeof(src)=='string'?src:img.src;
window.appendChild(zimg);
obj.appendChild(window);
this.window = window;
this.zimg = zimg;
this.wh = [obj.offsetWidth,obj.offsetHeight];
this.zoom = zoom;
this.os = typeof(os)=='object'&& os.constructor==Array && typeof(os[0])=='number'&& typeof(os[1])=='number'?os:[-window.offsetWidth/2,-window.offsetHeight/2];
this.wos = [-(zoom-1)*window.offsetWidth/2,-(zoom-1)*window.offsetHeight/2]; // to center the zoom on the pointer
this.addevt(document,'mousemove','imgzoom',obj);
}
zxcZoomImage.prototype={
imgzoom:function(e,obj){
var mse=this.mse(e);
var pos=this.pos(obj);
var x=mse[0]-pos[0];
var y=mse[1]-pos[1];
var wh=this.wh;
var os=this.os;
var wos=this.wos;
var window=this.window;
var zimg=this.zimg;
var zoom=this.zoom;
if (x>0&&x<wh[0]&&y>0&&y<wh[1]){
x+=os[0];
y+=os[1];
window.style.left=x+'px';
window.style.top=y+'px';
zimg.style.left=-x*zoom+wos[0]+'px';
zimg.style.top=-y*zoom+wos[1]+'px';
window.style.visibility='visible';
}
else {
window.style.visibility='hidden';
}
},
mse:function(e){
if (window.event){
var docs=[document.body.scrollLeft,document.body.scrollTop];
if (!document.body.scrollTop){
docs=[document.documentElement.scrollLeft,document.documentElement.scrollTop];
}
return [e.clientX+docs[0],e.clientY+docs[1]];
}
return [e.pageX,e.pageY];
},
pos:function(obj){
var rtn=[0,0];
while(obj){
rtn[0]+=obj.offsetLeft;
rtn[1]+=obj.offsetTop;
obj=obj.offsetParent;
}
return rtn;
},
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); });
}
} // end of prototype declarations
/*]]>*/
</script>
<script type="text/javascript">
/*<![CDATA[*/
function Init(){
new zxcZoomImage({
ID:'tst', // the unique ID name of the image to zoom. (string)
WindowClassName:'window', // the class name of the zoom window DIV element. (string)
Zoom:4, //(optional) the zoom factor. (number, default = 2)
ZoomSRC:'scia_no2_trop_2009.gif', //(optional) the file path and name of the zoom image.
//... (string, default = the src of the image to zoom)
ZoomWindowOffset:[-100,-75] //(optional) the zoom window x and y offsets from the mouse position.
//... (array, default = centered on the mouse position)
});
}
if (window.addEventListener){
window.addEventListener('load',Init, false);
}
else if (window.attachEvent){
window.attachEvent('onload',Init);
}
/*]]>*/
</script>
</head>
<body>
<noscript>
<!-- <meta http-equiv="refresh" content="0;url=index2.htm;" /> -->
<b>Your browser does not support JavaScript or it is disabled. <br>
Please enable JavaScript to be able to zoom the map. </b>
</noscript>
<div class="tstparent" >
<img id="tst" src="scia_no2_trop_2009.gif" alt="img" />
</div>
</body>
</html>
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