Drag And Drop Library

Jan 11, 2006

After a good deal of internal development, I've decided this library will do more good in the wild. It works in IE6, Safari 2, Opera 9, Firefox 1.5, and IE5.5/Mac (sort of buggy behavior with text selection in IE5.5/Mac though). It should also work in virtually any version of Gecko, Opera 6+, Safari 1, and IE5+ (anybody who wants to test those, feel free). The scripting is highly efficient, and only exposes two functions globally, Draggable and Droppable. The below code is licensed under the LGPL, though it is available under other licenses per request.

Let me know if you have any issues with it - this is something I'm interested in maintaining. Also, compared to other scripts, such as script.tac.ulo.us, this is much less code (lots of whitespace/comments could be taken out), and more widely supported across browsers.

Other than below, it can be found here: http://www.jasonkarldavis.com/scripts/dragdropable/dragdropable.html

// dragdropable.js (1.0.1)
//Copyright (C) 2006 Jason Davis, www.jasonkarldavis.com
//This code is licensed under the LGPL:
//http://www.gnu.org/licenses/lgpl.html
//
// Documentation:
//This script exposes two global variables, Draggable and Droppable. To make an
//element draggable, simply call `Draggable(element)`. This sets the necessary
//CSS properties and event handlers. It also overrides the addEventListener and
//and attachEvent methods (if present) to include the following events:
//onstart(When the element begins dragging)
//ondrag(When the element is being dragged)
//onstop(When the element has stopped dragging)
//You may also assign element.onstart, element.ondrag, and element.onstart to
//add event listeners.
//Lastly, if you need to physically prevent an element from dragging, you may
//call event.preventDefault() from within the onstart handler.
//
//To make an element droppable (have things dragged onto it), call
//`Droppable(element)`. This sets the necessary event handlers and coordinate
//searches. Once again, it overrides addEventListener and attachEvent to
//include the following events:
//onhover(When another element has been dragged over the element)
//ondrop(When another element has been dropped onto the element)
//onunhover(When another element has been dragged off the element)
//As before, you may also set element.onhover, element.ondrop, and
//element.onunhover directly.
//To remove all drop points from the current session, call `Droppable.reset()`.
//
//The event object is also extended with the following properties:
//dragTarget(The element being dragged)
//dropTarget(The element being dropped onto)
//
// Known bugs:
//* removeEventListener and detachEvent do not work with the custom events.
//Workaround: Use direct assignment (element.onevent) instead.
//* There is no way to remove a single drop point.
//Workaround: Call Droppable.reset(), then reinitialize the other drop points.
//* There is no way to remove dragging from an element.
//Workaround: element.onstart = function(event) { event.preventDefault() }
//* Changing position of droppable elements after initialization breaks drop
//Workaround: Static droppables are much faster than moving ones. Either call
//Droppable.reset() and reinitialize often, or ask the author to modify the
//script to account for this (and accept the resulting slowdown)


function Draggable(element) {
// initialize drag variable
var x = 0, y = 0, oldMouseMove, oldMouseUp;

// get style properties of element
var computedStyle;
if (typeof document.defaultView != "undefined" && typeof document.defaultView.getComputedStyle != "undefined")
computedStyle = document.defaultView.getComputedStyle(element, "");
else if (typeof element.currentStyle != "undefined")
computedStyle = element.currentStyle;
else
computedStyle = element.style;

// prep element for dragging
if (computedStyle.position == "static" || computedStyle.position == "")
element.style.position = "relative";
if (computedStyle.zIndex == "auto" || computedStyle.zIndex == "")
element.style.zIndex = 1;
element.style.left = isNaN(parseInt(computedStyle.left)) ? "0" : computedStyle.left;
element.style.top = isNaN(parseInt(computedStyle.top )) ? "0" : computedStyle.top;

// default event listeners
function onstart(event) {
event.dragTarget = element;
x = event.clientX;
y = event.clientY;

// Override preventDefault
event.preventDefault = (function(original) {
return function() {
element.ownerDocument.onmousemove = oldMouseMove;
element.ownerDocument.onmouseup = oldMouseUp;
original.call(event);
}
})(event.preventDefault || function() {});

if (element.onstart) element.onstart(event);
}
function ondrag(event) {
event.dragTarget = element;
element.style.left = parseInt(element.style.left) + event.clientX - x + "px";
element.style.top = parseInt(element.style.top) + event.clientY - y + "px";
x = event.clientX;
y = event.clientY;
Droppable.query(event);

if (element.ondrag) element.ondrag(event);
}
function onstop(event) {
event.dragTarget = element;
Droppable.query(event);

if (element.onstop) element.onstop(event);
}

// make listeners active
element.onmousedown = (function(oldMouseDown) {
return function() {
// Call old listener
if (oldMouseDown) oldMouseDown.apply(this, arguments);

// Store old event handlers
oldMouseMove = this.ownerDocument.onmousemove;
oldMouseUp = this.ownerDocument.onmouseup;

// Setup events
this.ownerDocument.onmousemove = function() {
// Call old listener
if (oldMouseMove) oldMouseMove.apply(this, arguments);

// Call ondrag
ondrag.call(element, arguments[0] || event);

return false;
}
this.ownerDocument.onmouseup = function() {
// Call old listener
if (oldMouseUp) oldMouseUp.apply(this, arguments);

// Call onstop
onstop.call(element, arguments[0] || event);

// Restore old event listeners
this.onmousemove = oldMouseMove;
this.onmouseup = oldMouseUp;

return false;
}

// Call onstart
onstart.call(this, arguments[0] || event);

return false;
}
})(element.onmousedown);

// override event attachers
if (element.addEventListener)
element.addEventListener = (function(original) {
return function(event, listener, useCapture) {
switch (event) {
case "start":
onstart = (function(old) {
return function(event) { old.call(element,event); listener.call(element,event); }
})(onstart);
break;
case "drag":
ondrag = (function(old) {
return function(event) { old.call(element,event); listener.call(element,event); }
})(ondrag);
break;
case "stop":
onstop = (function(old) {
return function(event) { old.call(element,event); listener.call(element,event); }
})(onstop);
break;
default:
original.call(element, event, listener, useCapture);
}
}
})(element.addEventListener);

if (element.attachEvent)
element.attachEvent = (function(original) {
return function(event, listener) {
switch (event) {
case "onstart":
onstart = (function(old) {
return function(event) { old.call(element,event); listener.call(element,event); }
})(onstart);
break;
case "ondrag":
ondrag = (function(old) {
return function(event) { old.call(element,event); listener.call(element,event); }
})(ondrag);
break;
case "onstop":
onstop = (function(old) {
return function(event) { old.call(element,event); listener.call(element,event); }
})(onstop);
break;
default:
original.call(element, event, listener);
}
}
})(element.attachEvent);


if (window.attachEvent)
window.attachEvent("onbeforeunload", function() {
onstart = ondrag = onstop = element.onmousedown = element.addEventListener = element.attachEvent = null;
element = null;
});
}


// initialize Droppable in the global scope
var Droppable;

(function() {
if (document.getBoxObjectFor) {
function getOffset(element) {
var box = document.getBoxObjectFor(element);
return { x: box.x, y: box.y };
}
}
else if (document.all && navigator.appName == "Microsoft Internet Explorer" && !window.opera) {
function getOffset(element) {
var range = document.body.createTextRange();
range.moveToElementText(element);
var rect = range.getBoundingClientRect();
return { x: rect.left, y: rect.top };
}
}
else {
function getOffset(element) {
var accumulator = arguments[1] || { x: 0, y: 0 };
if (element && element != document.body) {
accumulator.x += element.offsetLeft;
accumulator.y += element.offsetTop;
return getOffset(element.offsetParent, accumulator);
}
else {
return accumulator;
}
}
}

// initialize private pointers to current target information
var cTarget = null, cHover = null, cUnhover = null, cDrop = null;
function hotSpots(x,y) {
cTarget = cHover = cUnhover = cDrop = null;
}

// declare Droppable within the private scope
Droppable = function(element) {
// Calculate offset
var offset = getOffset(element);

// Calculate other edge offset
var edge = { x: offset.x + element.offsetWidth, y: offset.y + element.offsetHeight };

// Assign a finder function
hotSpots = (function(old) {
return function(x,y) {
if (offset.x <= x && x <= edge.x && offset.y <= y && y <= edge.y) {
cTarget = element;
cHover = onhover;
cUnhover = onunhover;
cDrop = ondrop;
}
else {
old(x,y);
}
}
})(hotSpots);

// default event listeners
function onhover(event) {
event.dropTarget = element;
if (element.onhover) element.onhover(event);
}
function onunhover(event) {
event.dropTarget = element;
if (element.onunhover) element.onunhover(event);
}
function ondrop(event) {
event.dropTarget = element;
if (element.ondrop) element.ondrop(event);
}

// override event attachers
if (element.addEventListener)
element.addEventListener = (function(original) {
return function(event, listener, useCapture) {
switch (event) {
case "hover":
onhover = (function(old) {
return function(event) { old.call(element,event); listener.call(element,event); }
})(onhover);
break;
case "unhover":
onunhover = (function(old) {
return function(event) { old.call(element,event); listener.call(element,event); }
})(onunhover);
break;
case "drop":
ondrop = (function(old) {
return function(event) { old.call(element,event); listener.call(element,event); }
})(ondrop);
break;
default:
original.call(element, event, listener, useCapture);
}
}
})(element.addEventListener);

if (element.attachEvent)
element.attachEvent = (function(original) {
return function(event, listener) {
switch (event) {
case "onhover":
onhover = (function(old) {
return function(event) { old.call(element,event); listener.call(element,event); }
})(onhover);
break;
case "onunhover":
onunhover = (function(old) {
return function(event) { old.call(element,event); listener.call(element,event); }
})(onunhover);
break;
case "ondrop":
ondrop = (function(old) {
return function(event) { old.call(element,event); listener.call(element,event); }
})(ondrop);
break;
default:
original.call(element, event, listener);
}
}
})(element.attachEvent);


if (window.attachEvent)
window.attachEvent("onbeforeunload", function() {
hotSpots = onhover = onunhover = ondrop = element.addEventListener = element.attachEvent = cTarget = cHover = cUnhover = cDrop = null;
element = null;
});
}

// Setup a query method
Droppable.query = function(event) {
var oTarget = cTarget,
oHover = cHover,
oUnhover = cUnhover,
oDrop = cDrop;

var scrollLeft = document.documentElement.scrollLeft || document.body.scrollLeft,
scrollTop = document.documentElement.scrollTop || document.body.scrollTop;


hotSpots(event.clientX + scrollLeft, event.clientY + scrollTop);

switch (event.type) {
case "mousemove": // onhover & onunhover
if (oTarget != null && oTarget != cTarget)
oUnhover.call(oTarget, event);
if (oTarget == null && cTarget != null)
cHover.call(cTarget, event);
break;
case "mouseup": // ondrop
if (cTarget != null) {
cUnhover.call(cTarget, event);
cDrop.call(cTarget, event);
}
break;
}
}

Droppable.reset = function() {
hotSpots = function(x,y) {
cTarget = cHover = cUnhover = cDrop = null;
}
hotSpots();
}
})();

// Fix the function prototype for IE5/Mac
if (typeof Function.prototype.apply == "undefined")
Function.prototype.apply = function(scope, args) {
if (!args) args = [];
var index = 0, result;
do { -- index } while (typeof scope[index] != "undefined");
scope[index] = this;

switch (args.length) {
case 0:
result = scope[index]();
break;
case 1:
result = scope[index](args[0]);
break;
case 2:
result = scope[index](args[0], args[1]);
break;
case 3:
result = scope[index](args[0], args[1], args[2]);
break;
case 4:
result = scope[index](args[0], args[1], args[2], args[3]);
break;
default:
result = scope[index](args[0], args[1], args[2], args[3], args[4]);
break;
}

delete scope[index];
return result;
}

if (typeof Function.prototype.call == "undefined")
Function.prototype.call = function(scope) {
var args = new Array(Math.max(arguments.length-1, 0));
for (var i = 1; i < arguments.length; i++)
args[i-1] = arguments[i];
return this.apply(scope, args);
}

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function window::onload(){
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</script>
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