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07.07.2008 at 01:06PM PDT, ID: 23544580
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7.0

Firefox 3.0 Zoom / Drag & Drop on Div problem

Asked by a1programmer in JavaScript

Tags:

I wrote some custom zoom functionality with drag / drop to move the image around.

However, in the new firefox 3, the first time you drag/drop the larger image, it works fine...  But the next time you try it, you get the error icon (circle / slash thingy ) so that you can no longer drag / drop over the div.    I already fixed IE related issues by adding a transparent div overtop of the IMG, but it doesn't work either way in FF3.

Anyone have any idea what is up?

demo:  http://www.derricksimpson.com/zoom2.0/
Start Free Trial 
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= = = = = = = = = zoom.js = = = = = = = = = = =
 
	var zoomLevel = 1.00;
	var MAX_ZOOM = 3.10;
	var MIN_ZOOM = 1.00;
	
	var width = 386;
	var height = 386;
	
	var zoomWidth = 386;
	var zoomHeight = 386;
	
	var zoomed = false;
	var zooming = false; 
	
	var mouseDown = false;
	
	var pos = new Object();
	pos.x = 0;
	pos.y = 0;
	
 
	function zoomIn(){
		
		zoomLevel += .1;
		
		if (zoomLevel > MAX_ZOOM){
			zoomLevel = MAX_ZOOM;
			zoomed = true;
			zooming = false;
			
			document.getElementById('zoom').style.width = zoomLevel * width;
			document.getElementById('zoom').style.height = zoomLevel * height;
			
			// calculate new left / top
			var newLeft=  ((zoomLevel * width) - width) / 2;
			var newTop =  ((zoomLevel * height) - height) / 2;
			pos.x = newLeft;
			pos.y = newTop;
			document.getElementById('zoom').style.left = newLeft * -1;
			document.getElementById('zoom').style.top = newTop * -1;
 
				
			return;
			
		}
		
		document.getElementById('zoom').style.width = zoomLevel * width;
		document.getElementById('zoom').style.height = zoomLevel * height;
		
		// calculate new left / top
		var newLeft=  ((zoomLevel * width) - width) / 2;
		var newTop =  ((zoomLevel * height) - height) / 2;
		pos.x = newLeft;
		pos.y = newTop;
		document.getElementById('zoom').style.left = newLeft * -1;
		document.getElementById('zoom').style.top = newTop * -1;
 
		setTimeout("zoomIn()",10);
	
	}
	
	function zoomOut(x, y){
		zoomLevel -= .1;
		
		if (zoomLevel < MIN_ZOOM){
			zoomLevel = MIN_ZOOM;
			
			placeImage();
			document.getElementById('zoom').style.left  = 0;
			document.getElementById('zoom').style.top = 0;
			document.getElementById('zoom').style.width = zoomLevel * width;
			document.getElementById('zoom').style.height = zoomLevel * height;
			zoomed = false;
			zooming = false;
			return;
		}
		
		placeImage();
		
		var percent = ( (zoomLevel - MIN_ZOOM) *  47.6190 ) ;
		
		// calculate new left
	
		document.getElementById('zoom').style.left  = x / 100 * (percent );
		document.getElementById('zoom').style.top = y / 100 * (percent );
		
		// calculate new right
		
		setTimeout("zoomOut(" + x * 1.0 + "," + y * 1.0 + ")", 10);
	}
	
	function placeImage(){
		document.getElementById('zoom').style.width = zoomLevel * width;
		document.getElementById('zoom').style.height = zoomLevel * height;
		
	}
	
	function toggleZoom() {
		if (zooming) return;
		
		zooming = true;
		
		if (zoomed){
		
			var left = document.getElementById('zoom').style.left.replace('px','') ;
			var top = document.getElementById('zoom').style.top.replace('px','')  ;
			
			zoomOut(left, top);
			
		} else {
			zoomIn();
		}
		
		
	}
	
	function move(e){
		if (! mouseDown || ! zoomed || zooming) {
			return;
		} 
		
		var newPos = getMousePos(e);
		
		var oldLeft = document.getElementById('zoom').offsetLeft;
		var oldTop = document.getElementById('zoom').offsetTop;
		
		var newLeft = oldLeft + ( newPos.x - pos.x );
		var newTop = oldTop + ( newPos.y - pos.y );
 
		var actualWidth = zoomLevel * width;
		var actualHeight = zoomLevel * height;
		
		if (newLeft <= 0 && ( (newLeft + actualWidth) > (width)) ){
			document.getElementById('zoom').style.left = newLeft;
		}
		
		if (newTop <= 0 && ( (newTop + actualHeight) > (height)) ) {
			document.getElementById('zoom').style.top  = newTop;
		}
		
		
		//zoomLevel * width;
		//zoomLevel * height;
		
		pos = getMousePos(e);
 
	}
	
	function down(e){
		// get mouse position when clicked;
		pos = getMousePos(e);
 
		mouseDown = true;
	}
	
	function up(e){
		
		mouseDown = false;
	}
	
	function getMousePos(e){
	
		if (!e) var e = window.event;
		var pos = Object();
		
		if (e.pageX && e.pageY) {
			pos.x = e.pageX; 
			pos.y = e.pageY;
		}
 
		else if (e.clientX && e.clientY) {
			pos.x = e.clientX;
			pos.y = e.clientY;
		}
		
		return pos;
	}
	
	function log(t){
	
		document.getElementById('log').innerHTML = t;
	}
 
 
 
 
 
 = = = = = = =  index.html = = = = = = = = =
 
 
 
 
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>zoom</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<meta http-equiv="Content-Script-Type" content="text/javascript">
 
<script type="text/JavaScript" src="zoom.js"></script>
 
<!--[if IE]>
<style>
	#zoomContainer{
	 filter: alpha(opacity=1);
	 background:#FFF;
	}
</style>
<![endif]-->
 
</head>
 
<body >
<a href="#" onClick="toggleZoom(); return false;">zoom</a>
<br />
<div id="container1" onMouseMove="move(event);" onMouseDown="down(event);" onMouseUp="up(event);" style="position:relative; overflow:hidden; float:left; width:386px; height:386px; ">
	<div id="zoomContainer" style="left:0px; top:0px; position:absolute; width:386px; height:386px; z-index:5;"></div>
	<img onFocus="blur();" id="zoom" style="left:0px; top:0px; position:absolute; width:386px; height:386px; z-index:1; " src="zoom.jpg"  border="0">
	
 
</div>
 
<br clear="all" />
<div id="log"></div>
 
</body>
</html>
[+][-]07.08.2008 at 02:17AM PDT, ID: 21952107

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[+][-]07.08.2008 at 06:25AM PDT, ID: 21953526

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[+][-]07.08.2008 at 06:31AM PDT, ID: 21953585

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[+][-]07.08.2008 at 08:02AM PDT, ID: 21954471

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[+][-]07.08.2008 at 11:13AM PDT, ID: 21956451

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[+][-]07.14.2008 at 10:56AM PDT, ID: 22000367

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About this solution

Zone: JavaScript
Tags: javascript zoom
Sign Up Now!
Solution Provided By: a1programmer
Participating Experts: 1
Solution Grade: A
 
 
[+][-]07.14.2008 at 11:37PM PDT, ID: 22004571

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