See the attached file (I changed the extension to .txt to get past my
company's email security -- it doesn't like .js files)
My dragdrop.js file is quite different from the official released
versions.. so beware, you might want to spend some time looking at a
side by side diff before trying to deploy it or copy changes over.
Basically, what I did to overcome the problem you described, is on drag
init, if the draggable has the option "ghosting" and "floating" both set
to true, I clone the element and attach it at the document level instead
of the container level. Therefore, it can now be dragged throughout the
entire document instead of just within the container it was originally
created within...
My dragdrop.js file also contains general optimizations to the droppales
processing (makes dragging MUCH smoother when you have multiple
droppables on the page... see my past posts on the same topic).
Hopefully, you'll at least be able to see what I did to solve the
problem you are having, and if anything copy that logic to your own
application...
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Robin
Haswell
Sent: Wednesday, February 15, 2006 3:16 PM
To: rails-spinoffs@lists.rubyonrails.org
Subject: [Rails-spinoffs] Draggables and overflow:auto
Hey guys. I'm trying to drag between two lists, except one list is
really long so I set a height on the <ul> with overflow:auto.
Unfortunately when I drag between the lists I can't drag items outside
of the <ul> with the overflow on. Does anyone know how I can make this
work? I think I might be able to hack up something with rico's live
tables, but that seems a bit overkill. Any advice appreciated :-)
Oh the ul is in a div with a width that is floated right. Dunno if that
makes a difference, some people on the intarweb have mentioned it
though.
Cheers
-Rob
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// Copyright (c) 2005 Thomas Fuchs (http://script.aculo.us, http://mir.aculo.us)
//
// See scriptaculous.js for full license.
/*--------------------------------------------------------------------------*/
var Droppables = {
drops: [],
remove: function(element) {
this.drops = this.drops.reject(function(d) { return d.element==$(element)
});
},
add: function(element) {
element = $(element);
var options = Object.extend({
greedy: true,
hoverclass: null
}, arguments[1] || {});
// cache containers
if(options.containment) {
options._containers = [];
var containment = options.containment;
if((typeof containment == 'object') &&
(containment.constructor == Array)) {
containment.each( function(c) { options._containers.push($(c)) });
} else {
options._containers.push($(containment));
}
}
if(options.accept) options.accept = [options.accept].flatten();
Element.makePositioned(element); // fix IE
options.element = element;
if (element.className)
element.originalClassName = element.className;
this.drops.push(options);
},
isContained: function(element, drop) {
var parentNode = element.parentNode;
return drop._containers.detect(function(c) { return parentNode == c });
},
isAffected: function(point, element, drop) {
return (
(drop.element!=element) &&
((!drop._containers) ||
this.isContained(element, drop)) &&
((!drop.accept) ||
(Element.classNames(element).detect(
function(v) { return drop.accept.include(v) } ) )) &&
Position.within(drop.element, point[0], point[1]) );
},
deactivate: function(drop) {
if(drop.hoverclass)
{
if (drop.element.originalClassName)
drop.element.className = drop.element.originalClassName;
else
Element.removeClassName(drop.element, drop.hoverclass);
}
this.last_active = null;
},
activate: function(drop) {
if(drop.hoverclass)
{
if (drop.element.originalClassName)
drop.element.className = drop.hoverclass;
else
Element.addClassName(drop.element, drop.hoverclass);
}
this.last_active = drop;
},
show: function(point, draggable) {
if(!this.drops.length) return;
if(this.last_active) this.deactivate(this.last_active);
try
{
this.drops.each( function(drop) {
if (Draggables.mouseMoveTimerValue)
throw $break;
//give the draggable a chance to tell us if we should even bother
checking this droppable
if (!draggable.options.checkDropRelevance ||
(draggable.options.checkDropRelevance &&
draggable.options.checkDropRelevance(drop)))
{
if(Droppables.isAffected(point, draggable.element, drop)) {
if(drop.onHover)
drop.onHover(draggable.element, drop.element,
Position.overlap(drop.overlap, drop.element));
if(drop.greedy) {
Droppables.activate(drop);
throw $break;
}
}
}
});
}
catch (e)
{
//this catch block lets the application continue executing if a drop
element is no longer valid in the DOM tree
}
},
fire: function(event, element) {
if(!this.last_active) return;
Position.prepare();
if (this.isAffected([Event.pointerX(event), Event.pointerY(event)],
element, this.last_active))
if (this.last_active.onDrop)
this.last_active.onDrop(element, this.last_active.element, event);
},
reset: function() {
if(this.last_active)
this.deactivate(this.last_active);
}
}
var Draggables = {
drags: [],
observers: [],
register: function(draggable) {
if(this.drags.length == 0) {
this.eventMouseUp = this.endDrag.bindAsEventListener(this);
this.eventMouseMove = this.updateDrag.bindAsEventListener(this);
this.eventKeypress = this.keyPress.bindAsEventListener(this);
Event.observe(document, "mouseup", this.eventMouseUp);
Event.observe(document, "mousemove", this.eventMouseMove);
Event.observe(document, "keypress", this.eventKeypress);
// prevent text selection while dragging.
document.onselectstart = document.ondragstart = function() { return
this.activeDraggable == null; }.bind(this);
}
this.drags.push(draggable);
},
unregister: function(draggable) {
this.drags = this.drags.reject(function(d) { return d==draggable });
if(this.drags.length == 0) {
Event.stopObserving(document, "mouseup", this.eventMouseUp);
Event.stopObserving(document, "mousemove", this.eventMouseMove);
Event.stopObserving(document, "keypress", this.eventKeypress);
}
},
activate: function(draggable) {
window.focus(); // allows keypress events if window isn't currently
focused, fails for Safari
this.activeDraggable = draggable;
},
deactivate: function(draggable) {
this.activeDraggable = null;
},
updateDrag: function(event) {
if(!this.activeDraggable) return;
var pointer = [Event.pointerX(event), Event.pointerY(event)];
// Mozilla-based browsers fire successive mousemove events with
// the same coordinates, prevent needless redrawing (moz bug?)
if(this._lastPointer && (this._lastPointer.inspect() == pointer.inspect()))
return;
this._lastPointer = pointer;
this.mouseMoveTimerValue = 1;
this.activeDraggable.updateDrag(event, pointer);
if (this.mouseMoveTimer)
clearTimeout(this.mouseMoveTimer)
this.mouseMoveTimer = setTimeout(function() {
this.decrementMouseMoveTimer(); }.bind(this), 50);
},
decrementMouseMoveTimer: function()
{
if (this.mouseMoveTimerValue > 0)
{
this.mouseMoveTimerValue--;
this.mouseMoveTimer = setTimeout(function() {
this.decrementMouseMoveTimer(); }.bind(this), 50);
}
else
{
this.mouseMoverTimer = null;
if (this._lastPointer && this.activeDraggable)
Droppables.show(this._lastPointer, this.activeDraggable);
}
},
endDrag: function(event) {
if(!this.activeDraggable) return;
this._lastPointer = null;
this.activeDraggable.endDrag(event);
this.activeDraggable = null;
},
keyPress: function(event) {
if(this.activeDraggable)
this.activeDraggable.keyPress(event);
},
addObserver: function(observer) {
this.observers.push(observer);
this._cacheObserverCallbacks();
},
removeObserver: function(element) { // element instead of observer fixes mem
leaks
this.observers = this.observers.reject( function(o) { return
o.element==element });
this._cacheObserverCallbacks();
},
notify: function(eventName, draggable, event) { // 'onStart', 'onEnd',
'onDrag'
if(this[eventName+'Count'] > 0)
this.observers.each( function(o) {
if(o[eventName]) o[eventName](eventName, draggable, event);
});
},
_cacheObserverCallbacks: function() {
['onStart','onEnd','onDrag'].each( function(eventName) {
Draggables[eventName+'Count'] = Draggables.observers.select(
function(o) { return o[eventName]; }
).length;
});
}
}
/*--------------------------------------------------------------------------*/
var Draggable = Class.create();
Draggable.prototype = {
initialize: function(element) {
var options = Object.extend({
handle: false,
starteffect: function(element) {
new Effect.Opacity(element, {duration:0.2, from:1.0, to:0.7});
},
reverteffect: function(element, top_offset, left_offset) {
var dur =
Math.sqrt(Math.abs(top_offset^2)+Math.abs(left_offset^2))*0.02;
element._revert = new Effect.Move(element, { x: -left_offset, y:
-top_offset, duration: dur});
},
endeffect: function(element) {
new Effect.Opacity(element, {duration:0.2, from:0.7, to:1.0});
},
zindex: 1000,
revert: false,
scroll: false,
scrollSensitivity: 20,
scrollSpeed: 15,
snap: false // false, or xy or [x,y] or function(x,y){ return [x,y] }
}, arguments[1] || {});
this.element = $(element);
if(options.handle && (typeof options.handle == 'string'))
this.handle = Element.childrenWithClassName(this.element,
options.handle)[0];
if(!this.handle) this.handle = $(options.handle);
if(!this.handle) this.handle = this.element;
if(options.scroll) options.scroll = $(options.scroll);
Element.makePositioned(this.element); // fix IE
this.delta = this.currentDelta();
this.options = options;
this.dragging = false;
this.eventMouseDown = this.initDrag.bindAsEventListener(this);
Event.observe(this.handle, "mousedown", this.eventMouseDown);
Draggables.register(this);
},
destroy: function() {
Event.stopObserving(this.handle, "mousedown", this.eventMouseDown);
Draggables.unregister(this);
},
currentDelta: function() {
return([
parseInt(Element.getStyle(this.element,'left') || '0'),
parseInt(Element.getStyle(this.element,'top') || '0')]);
},
initDrag: function(event) {
if(Event.isLeftClick(event)) {
// abort on form elements, fixes a Firefox issue
var src = Event.element(event);
if(src.tagName && (
src.tagName=='INPUT' ||
src.tagName=='SELECT' ||
src.tagName=='OPTION' ||
src.tagName=='BUTTON' ||
src.tagName=='TEXTAREA')) return;
if(this.element._revert) {
this.element._revert.cancel();
this.element._revert = null;
}
Draggables.activate(this);
if(this.options.ghosting) {
this._clone = this.element.cloneNode(true);
Position.absolutize(this.element);
if (this.options.floating)
{
var node = document.body.lastChild;
node = (node.nodeType == 3) ? node.nextSibling : node;
document.body.insertBefore(this._clone, node);
var tempNode = this.element;
this.element = this._clone;
this._clone = tempNode;
tempNode = null;
var cloneStyle = this._clone.style;
Element.setStyle(this.element,
{
width: cloneStyle.width,
height: cloneStyle.height,
visibility: "hidden"
});
Position.absolutize(this.element);
Position.clone(this._clone, this.element);
Position.relativize(this._clone);
}
else
this.element.parentNode.insertBefore(this._clone, this.element);
}
var pointer = [Event.pointerX(event), Event.pointerY(event)];
var pos = Position.cumulativeOffset(this.element);
this.offset = [0,1].map( function(i) { return (pointer[i] - pos[i]) });
//Event.stop(event);
}
},
startDrag: function(event) {
this.dragging = true;
Element.setStyle(this.element, {visibility: ""});
if(this.options.zindex) {
this.originalZ = parseInt(Element.getStyle(this.element,'z-index') || 0);
this.element.style.zIndex = this.options.zindex;
}
if(this.options.scroll) {
this.originalScrollLeft = this.options.scroll.scrollLeft;
this.originalScrollTop = this.options.scroll.scrollTop;
}
Draggables.notify('onStart', this, event);
if(this.options.starteffect) this.options.starteffect(this.element);
},
updateDrag: function(event, pointer) {
if(!this.dragging) this.startDrag(event);
Position.prepare();
this.draw(pointer);
Draggables.notify('onDrag', this, event);
if(this.options.change) this.options.change(this);
if(this.options.scroll) {
//if(this.scrollInterval) this.scroll();
this.stopScrolling();
//var p = Position.page(this.options.scroll);
var p = Position.cumulativeOffset(this.options.scroll);
//p[0] += this.options.scroll.scrollLeft;
//p[1] += this.options.scroll.scrollTop;
p.push(p[0]+this.options.scroll.offsetWidth);
p.push(p[1]+this.options.scroll.offsetHeight);
var speed = [0,0];
if(pointer[0] < (p[0]+this.options.scrollSensitivity)) speed[0] =
pointer[0]-(p[0]+this.options.scrollSensitivity);
if(pointer[1] < (p[1]+this.options.scrollSensitivity)) speed[1] =
pointer[1]-(p[1]+this.options.scrollSensitivity);
if(pointer[0] > (p[2]-this.options.scrollSensitivity)) speed[0] =
pointer[0]-(p[2]-this.options.scrollSensitivity);
if(pointer[1] > (p[3]-this.options.scrollSensitivity)) speed[1] =
pointer[1]-(p[3]-this.options.scrollSensitivity);
this.startScrolling(speed);
}
// fix AppleWebKit rendering
if(navigator.appVersion.indexOf('AppleWebKit')>0) window.scrollBy(0,0);
Event.stop(event);
},
finishDrag: function(event, success) {
this.dragging = false;
if(this.options.ghosting) {
if (this.options.floating)
{
var tempNode = this.element;
this.element = this._clone;
this._clone = tempNode;
tempNode = null;
}
Position.relativize(this.element);
Element.remove(this._clone);
this._clone = null;
}
if(success) Droppables.fire(event, this.element);
Draggables.notify('onEnd', this, event);
var revert = this.options.revert;
if(revert && typeof revert == 'function') revert = revert(this.element);
var d = this.currentDelta();
if(revert && this.options.reverteffect) {
this.options.reverteffect(this.element,
d[1]-this.delta[1], d[0]-this.delta[0]);
} else {
this.delta = d;
}
if(this.options.zindex)
this.element.style.zIndex = this.originalZ;
if(this.options.endeffect)
this.options.endeffect(this.element);
Draggables.deactivate(this);
Droppables.reset();
},
keyPress: function(event) {
if(!event.keyCode==Event.KEY_ESC) return;
this.finishDrag(event, false);
Event.stop(event);
},
endDrag: function(event) {
if(!this.dragging) return;
this.stopScrolling();
this.finishDrag(event, true);
Event.stop(event);
},
draw: function(point) {
var pos = Position.cumulativeOffset(this.element);
var d = this.currentDelta();
pos[0] -= d[0]; pos[1] -= d[1];
if(this.options.scroll && !this.options.floating)
{
pos[0] -= this.options.scroll.scrollLeft-this.originalScrollLeft;
pos[1] -= this.options.scroll.scrollTop-this.originalScrollTop;
}
var p = [0,1].map(function(i){
return (point[i]-pos[i]-this.offset[i])
}.bind(this));
if(this.options.snap) {
if(typeof this.options.snap == 'function') {
p = this.options.snap(p[0],p[1]);
} else {
if(this.options.snap instanceof Array) {
p = p.map( function(v, i) {
return Math.round(v/this.options.snap[i])*this.options.snap[i]
}.bind(this))
} else {
p = p.map( function(v) {
return Math.round(v/this.options.snap)*this.options.snap }.bind(this))
}
}}
var style = this.element.style;
if((!this.options.constraint) || (this.options.constraint=='horizontal'))
style.left = p[0] + "px";
if((!this.options.constraint) || (this.options.constraint=='vertical'))
style.top = p[1] + "px";
if(style.visibility=="hidden") style.visibility = ""; // fix gecko rendering
},
stopScrolling: function() {
if(this.scrollInterval) {
clearInterval(this.scrollInterval);
this.scrollInterval = null;
}
},
startScrolling: function(speed) {
this.scrollSpeed =
[speed[0]*this.options.scrollSpeed,speed[1]*this.options.scrollSpeed];
this.lastScrolled = new Date();
this.scrollInterval = setInterval(this.scroll.bind(this), 10);
},
scroll: function() {
var current = new Date();
var delta = current - this.lastScrolled;
this.lastScrolled = current;
this.options.scroll.scrollLeft += this.scrollSpeed[0] * delta / 1000;
this.options.scroll.scrollTop += this.scrollSpeed[1] * delta / 1000;
Position.prepare();
Draggables.notify('onDrag', this);
this.draw(Draggables._lastPointer);
if(this.options.change) this.options.change(this);
}
}
/*--------------------------------------------------------------------------*/
var SortableObserver = Class.create();
SortableObserver.prototype = {
initialize: function(element, observer) {
this.element = $(element);
this.observer = observer;
this.lastValue = Sortable.serialize(this.element);
},
onStart: function() {
this.lastValue = Sortable.serialize(this.element);
},
onEnd: function() {
Sortable.unmark();
if(this.lastValue != Sortable.serialize(this.element))
this.observer(this.element)
}
}
var Sortable = {
sortables: new Array(),
options: function(element){
element = $(element);
return this.sortables.detect(function(s) { return s.element == element });
},
destroy: function(element){
element = $(element);
this.sortables.findAll(function(s) { return s.element == element
}).each(function(s){
Draggables.removeObserver(s.element);
s.droppables.each(function(d){ Droppables.remove(d) });
s.draggables.invoke('destroy');
});
this.sortables = this.sortables.reject(function(s) { return s.element ==
element });
},
create: function(element) {
element = $(element);
var options = Object.extend({
element: element,
tag: 'li', // assumes li children, override with tag:
'tagname'
dropOnEmpty: false,
tree: false, // fixme: unimplemented
overlap: 'vertical', // one of 'vertical', 'horizontal'
constraint: 'vertical', // one of 'vertical', 'horizontal', false
containment: element, // also takes array of elements (or id's); or
false
handle: false, // or a CSS class
only: false,
hoverclass: null,
ghosting: false,
format: null,
onChange: Prototype.emptyFunction,
onUpdate: Prototype.emptyFunction
}, arguments[1] || {});
// clear any old sortable with same element
this.destroy(element);
// build options for the draggables
var options_for_draggable = {
revert: true,
ghosting: options.ghosting,
constraint: options.constraint,
handle: options.handle };
if(options.starteffect)
options_for_draggable.starteffect = options.starteffect;
if(options.reverteffect)
options_for_draggable.reverteffect = options.reverteffect;
else
if(options.ghosting) options_for_draggable.reverteffect =
function(element) {
element.style.top = 0;
element.style.left = 0;
};
if(options.endeffect)
options_for_draggable.endeffect = options.endeffect;
if(options.zindex)
options_for_draggable.zindex = options.zindex;
// build options for the droppables
var options_for_droppable = {
overlap: options.overlap,
containment: options.containment,
hoverclass: options.hoverclass,
onHover: Sortable.onHover,
greedy: !options.dropOnEmpty
}
// fix for gecko engine
Element.cleanWhitespace(element);
options.draggables = [];
options.droppables = [];
// make it so
// drop on empty handling
if(options.dropOnEmpty) {
Droppables.add(element,
{containment: options.containment, onHover: Sortable.onEmptyHover,
greedy: false});
options.droppables.push(element);
}
(this.findElements(element, options) || []).each( function(e) {
// handles are per-draggable
var handle = options.handle ?
Element.childrenWithClassName(e, options.handle)[0] : e;
options.draggables.push(
new Draggable(e, Object.extend(options_for_draggable, { handle: handle
})));
Droppables.add(e, options_for_droppable);
options.droppables.push(e);
});
// keep reference
this.sortables.push(options);
// for onupdate
Draggables.addObserver(new SortableObserver(element, options.onUpdate));
},
// return all suitable-for-sortable elements in a guaranteed order
findElements: function(element, options) {
if(!element.hasChildNodes()) return null;
var elements = [];
$A(element.childNodes).each( function(e) {
if(e.tagName && e.tagName.toUpperCase()==options.tag.toUpperCase() &&
(!options.only || (Element.hasClassName(e, options.only))))
elements.push(e);
if(options.tree) {
var grandchildren = this.findElements(e, options);
if(grandchildren) elements.push(grandchildren);
}
});
return (elements.length>0 ? elements.flatten() : null);
},
onHover: function(element, dropon, overlap) {
if(overlap>0.5) {
Sortable.mark(dropon, 'before');
if(dropon.previousSibling != element) {
var oldParentNode = element.parentNode;
element.style.visibility = "hidden"; // fix gecko rendering
dropon.parentNode.insertBefore(element, dropon);
if(dropon.parentNode!=oldParentNode)
Sortable.options(oldParentNode).onChange(element);
Sortable.options(dropon.parentNode).onChange(element);
}
} else {
Sortable.mark(dropon, 'after');
var nextElement = dropon.nextSibling || null;
if(nextElement != element) {
var oldParentNode = element.parentNode;
element.style.visibility = "hidden"; // fix gecko rendering
dropon.parentNode.insertBefore(element, nextElement);
if(dropon.parentNode!=oldParentNode)
Sortable.options(oldParentNode).onChange(element);
Sortable.options(dropon.parentNode).onChange(element);
}
}
},
onEmptyHover: function(element, dropon) {
if(element.parentNode!=dropon) {
var oldParentNode = element.parentNode;
dropon.appendChild(element);
Sortable.options(oldParentNode).onChange(element);
Sortable.options(dropon).onChange(element);
}
},
unmark: function() {
if(Sortable._marker) Element.hide(Sortable._marker);
},
mark: function(dropon, position) {
// mark on ghosting only
var sortable = Sortable.options(dropon.parentNode);
if(sortable && !sortable.ghosting) return;
if(!Sortable._marker) {
Sortable._marker = $('dropmarker') || document.createElement('DIV');
Element.hide(Sortable._marker);
Element.addClassName(Sortable._marker, 'dropmarker');
Sortable._marker.style.position = 'absolute';
document.getElementsByTagName("body").item(0).appendChild(Sortable._marker);
}
var offsets = Position.cumulativeOffset(dropon);
Sortable._marker.style.left = offsets[0] + 'px';
Sortable._marker.style.top = offsets[1] + 'px';
if(position=='after')
if(sortable.overlap == 'horizontal')
Sortable._marker.style.left = (offsets[0]+dropon.clientWidth) + 'px';
else
Sortable._marker.style.top = (offsets[1]+dropon.clientHeight) + 'px';
Element.show(Sortable._marker);
},
serialize: function(element) {
element = $(element);
var sortableOptions = this.options(element);
var options = Object.extend({
tag: sortableOptions.tag,
only: sortableOptions.only,
name: element.id,
format: sortableOptions.format || /^[^_]*_(.*)$/
}, arguments[1] || {});
return $(this.findElements(element, options) || []).map( function(item) {
return (encodeURIComponent(options.name) + "[]=" +
encodeURIComponent(item.id.match(options.format) ?
item.id.match(options.format)[1] : ''));
}).join("&");
}
}_______________________________________________
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