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Ever wanted to drag an element or image around on your Web page? Just attach this drag handler to any number of elements on the page and you will be able to drag them all. Note that the elements must be positioned either relatively or absolutely.

Label: Crossbrowser Drag Handler

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<script type="text/javascript">
// Created by: Justas | http://www.webtoolkit.info/

var DragHandler = {

// private property.
_oElem : null,

// public method. Attach drag handler to an element.
attach : function(oElem) {
		oElem.onmousedown = DragHandler._dragBegin;
		// callbacks
		oElem.dragBegin = new Function();
		oElem.drag = new Function();
		oElem.dragEnd = new Function();
		return oElem;
},

// private method. Begin drag process.
_dragBegin : function(e) {
		var oElem = DragHandler._oElem = this;
		if (isNaN(parseInt(oElem.style.left))) { oElem.style.left = '0px'; }
		if (isNaN(parseInt(oElem.style.top))) { oElem.style.top = '0px'; }
		var x = parseInt(oElem.style.left);
		var y = parseInt(oElem.style.top);
		e = e ? e : window.event;
		oElem.mouseX = e.clientX;
		oElem.mouseY = e.clientY;
		oElem.dragBegin(oElem, x, y);
		document.onmousemove = DragHandler._drag;
		document.onmouseup = DragHandler._dragEnd;
		return false;
},

// private method. Drag (move) element.
_drag : function(e) {
		var oElem = DragHandler._oElem;
		var x = parseInt(oElem.style.left);
		var y = parseInt(oElem.style.top);
		e = e ? e : window.event;
		oElem.style.left = x + (e.clientX - oElem.mouseX) + 'px';
		oElem.style.top = y + (e.clientY - oElem.mouseY) + 'px';
		oElem.mouseX = e.clientX;
		oElem.mouseY = e.clientY;
		oElem.drag(oElem, x, y);
		return false;
},

// private method. Stop drag process.
_dragEnd : function() {
		var oElem = DragHandler._oElem;
		var x = parseInt(oElem.style.left);
		var y = parseInt(oElem.style.top);
		oElem.dragEnd(oElem, x, y);
		document.onmousemove = null;
		document.onmouseup = null;
		DragHandler._oElem = null;
	}
};

// =============

function beginScript() {
  function begin (element, x, y) {
  		var s = '#' + element.id + ' (begin drag)' + ' x:' + x + ', y:' + y;
  		updateInfo(s);
  }

  function drag (element, x, y) {
  		var s = '#' + element.id + ' (dragging)' + ' x:' + x + ', y:' + y;
  		updateInfo(s);
  }

  function end (element, x, y) {
  		var s = '#' + element.id + ' (end drag)' + ' x:' + x + ', y:' + y;
  		updateInfo(s);
  }

  function updateInfo(s) {
  // Comment out the line below to stop displaying the location
  		document.getElementById('info').innerHTML = s;
  }

  var dragable1 = DragHandler.attach(document.getElementById('dragable1'));
  var dragable2 = DragHandler.attach(document.getElementById('dragable2'));
  var dragable3 = DragHandler.attach(document.getElementById('dragable3'));

  dragable1.dragBegin = begin;
  dragable1.drag = drag;
  dragable1.dragEnd = end;

  dragable2.dragBegin = begin;
  dragable2.drag = drag;
  dragable2.dragEnd = end;

  dragable3.dragBegin = begin;
  dragable3.drag = drag;
  dragable3.dragEnd = end;
}

// =============

// Multiple onload function created by: Simon Willison
// http://simon.incutio.com/archive/2004/05/26/addLoadEvent
function addLoadEvent(func) {
  var oldonload = window.onload;
  if (typeof window.onload != 'function') {
    window.onload = func;
  } else {
    window.onload = function() {
      if (oldonload) {
        oldonload();
      }
      func();
    }
  }
}

addLoadEvent(function() {
  beginScript();
});


</script>
	<!--
    	This script downloaded from www.JavaScriptBank.com
    	Come to view and download over 2000+ free javascript at www.JavaScriptBank.com
	-->

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<div id="info">Start drag process...</div>

<div id="dragable1" style="position: relative; width: 50px; height: 50px; background: silver; border: 1px dashed red; font-size: 11px; padding: 5px; text-align: center;"><br>Drag me!</div>
<div id="dragable2" style="position: relative; width: 90px; height: 40px; background: silver; border: 1px dashed red; font-size: 11px; padding: 5px; text-align: center;"><br>Drag me too!</div>
<div id="dragable3" style="position: relative; width: 126px; height: 64px;"><img src="../image/logojsb.gif"></div>
	<!--
    	This script downloaded from www.JavaScriptBank.com
    	Come to view and download over 2000+ free javascript at www.JavaScriptBank.com
	-->

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20/04/2008
Justas [more]
6,592
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JavaScript Crossbrowser Drag Handler

3.7/5 11 votes / 6,592 previews / 0 comment 20/04/2008 Ever wanted to drag an element or image around on your Web...JavaScript Crossbrowser Drag Handler - Crossbrowser Drag Handler

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