DZone Snippets is a public source code repository. Easily build up your personal collection of code snippets, categorize them with tags / keywords, and share them with the world

Snippets Manager

Snippets has posted 5883 posts at DZone. View Full User Profile

Javascript Drag And Drop

06.03.2007

| 6889 views |

        Ever wanted to drag an element or image on your webpage? You can try using this very lightweight <A href="http://www.webtoolkit.info/javascript-drag-and-drop.html">javascript drag and drop</a>. You can attach this drag handler to any relative or absolute positioned element. More code snippets you can find on <a href="http://www.webtoolkit.info/">free code and tutorials website</a>.

/**
*
*  Crossbrowser Drag Handler
*  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;
	}

}

Tags: