jQuery: how to enable droppable again - javascript

I want it to be possible to drag (draggables) several HTML elements into several other HTML elements. (droppables)
I found the jQuery UI draggable/droppable.
Currently, I define all li elements inside an ul as draggable. I also have three divs which accept all the draggable li elements.
<ul>
<li>foo</li>
<li>bar</li>
<li>baz</li>
</ul>
Defining them as draggable:
$('li').draggable({ revert: 'invalid' });
My droppable divs:
<div class="droppable" id="div1"></div>
<div class="droppable" id="div2"></div>
<div class="droppable" id="div3"></div>
Make the divs droppable:
$('div.droppable').droppable({ accept: 'li', drop: funcDrop, out: funcOut });
I now want that only one li element can be dropped into a div at the same time. I am trying to do that by disabling the droppability inside the div element I dropped the draggable, like so:
funcDrop = function(event, ui) {
$(this).droppable('disable');
}
This works. Now I am not able drop any further li elements into this div. The problem is, how/when to enable the div again? Clearly if the contianing draggable was removed. So I tried to enable the div inside funcOut:
funcOut= function(event, ui) {
strIdValue = event.target.id;
$('#' + strIdValue).droppable('enable');
}
But this does not work.
It seems also that I can't work with $(this) selector inside the funcOut.
Does anyone have a hint?
Best regards
I use jQuery 2.1 and UI 1.10.4

I figured out an alternative solution:
It seems if an element once was disabled, the out event does not fire and I am therefore not able to enable it again using the element itself. So what I did, is this:
If you drop a draggable element on a droppable element, the drop event is triggered and does this:
$(this).droppable({ accept: ('#' + $(ui.draggable).attr('id')) });
So the droppable is not disabled, but accepts only the received draggable by its unique HTML id. Because it is not disabled the out event will now be triggered. This is what I do in it:
$(this).droppable({ accept: 'li' });
Now the droppable accepts all HTML li elements as ever. Now each droppable accepts only one draggable. The droppable is now "locked" if it receives a draggable.
I wonder if this is a valid solution or just a dirty hack.

(Possible duplicate/related: jQuery UI - Droppable only accept one draggable)
Based on the JSFiddle you've shared (which currently is not doing what you asked), here is a modified version of the droppable function that you can use to achieve the desired result:
$(".droppable").droppable({
accept: "li",
drop: function(event, ui) {
$(this).droppable('option', 'accept', ui.draggable);
},
out: function(event, ui){
$(this).droppable('option', 'accept', 'li');
}
});
As the other answer stated, the trick is to make our droppable div accept 'ui.draggable', being ui the item that is currently being dragged to our droppable div.
Hope that helps!
(EDITED: Grammar)

Related

Jquery UI. Droppable after element

I have an issue regarding jquery Ui droppable.
I need to drop an element before or after the element it's dragged over. Is there anyway to detect which element it's over, and then append/prepend it in the parent container.
Right now, I just drops in the end of the div, because of append, I'm a little clueless.
I made a fiddle to hopefully better illustrate my issue:
http://jsfiddle.net/tsxzf80u/
$('section').droppable({
accept:'.dragme',
drop:function(event, ui){
var div = $("<div />").addClass('full').html('test');
$(this).append(div);
}
});
Thanks in advance
If you make each of the divs inside of the section individually droppable, then use after(), seems to do what you want.
$('#fullId1, #fullId2').droppable({
accept: '.dragme',
drop: function (event, ui) {
var div = $("<div />").addClass('full').html('test');
$(this).after(div);
}
});
http://jsfiddle.net/tsxzf80u/2/

Jquery UI Droppable: How can I use different hoverClass values based on some logic?

I am using the JQuery UI droppable library features, and I want to provide visual user feedback when they hover over a droppable target. For this I can easily use the hoverClass option to specify which class to use when they have a draggable item hovering over.
But what I want to do is use a different hoverClass value depending on some logic. Basically, there are a number of areas that are "droppable", and there is a number of items that can be dragged and dropped - however, not all items can be dropped on all areas. So I would like to have, for example, a green background if the drop is valid, and a red background if the drop is invalid.
How can this be done? I know what logic I want to use, but where can I add the logic. It obviously needs to be somewhere I can access the element being dragged, and the potential drop target element.
My simple code so far is as follows:
$(".DragItem").draggable({
revert: true,
helper: "clone"
});
$(".DropItem").droppable({
tolerance: "touch",
hoverClass: "DropTargetValid"
});
$(".DropItem").droppable({
tolerance: "touch",
hoverClass: "DropTargetValid",
over: function(event, ui) {
console.log(ui.draggable); // the draggable object
console.log($(this)); // the droppable object
}
});
This should do it. On over that event will be triggered on all .DropItem elements. You can find more about the available events API here: http://api.jqueryui.com/droppable/
I think your issue is trying to do it with the class itself, when droppable has its own hover event, called over jQuery droppable API #over
So you'd want:
$(".DropItem").droppable({
tolerance: "touch",
over: function(event, ui) {
// ... logic goes here
}
});
The other answers are exactly what I was looking for. However, I want to go into a bit further detail here to give a better example of how to process the logic.
Lets say for example, with have some simple HTML as follows. This HTML basically has 4 draggable objects, and 4 possible drop targets:
<div style="margin-bottom:20px;">
<div data-id="1" class="DragItem">I am 1</div>
<div data-id="2" class="DragItem">I am 2</div>
<div data-id="3" class="DragItem">I am 3</div>
<div data-id="4" class="DragItem">I am 4</div>
</div>
<div>
<div data-id="123" class="DropItem">I accept 1, 2 and 3</div>
<div data-id="23" class="DropItem">I accept 2 and 3</div>
<div data-id="34" class="DropItem">I accept 3 and 4</div>
<div data-id="1234" class="DropItem">I accept all</div>
</div>
As can be seen, I have used data-* attributes to store specific identifying values. The IDs on the DragItem identify the drag object, and the IDs on the DropItem contain all valid values.
The javascript that processes this logic, and then applies the correct classes is as follows:
$(".DragItem").draggable({
revert: true,
helper: "clone"
});
$(".DropItem").droppable({
tolerance: "touch",
over: function (event, ui) {
var dropItem = $(this);
var dragItem = $(ui.draggable);
var valid = String(dropItem.data("id")).indexOf(dragItem.data("id")) > -1;
if (valid) {
dropItem.addClass("DropTargetValid");
} else {
dropItem.addClass("DropTargetInvalid");
}
},
out: function (event, ui) {
var dropItem = $(this);
dropItem.removeClass("DropTargetValid");
dropItem.removeClass("DropTargetInvalid");
},
deactivate: function (event, ui) {
var dropItem = $(this);
dropItem.removeClass("DropTargetValid");
dropItem.removeClass("DropTargetInvalid");
}
});
As can be seen, I am doing a simple "does string contain" logic check. This is fine for small numbers but if there is ever a need to do more than 9 object we would need a more reliable string in the DropItem data-id value.
I also use the out and deactivate events to clear up the applied classes. In this example I duplicate the code, but this could easily be replaced with a single function used by both events.
Finally, the moment you have all been waiting for, here is a working example.
Use the Draggable Start/Stop events to add and remove classes to your dropzones.
http://api.jqueryui.com/draggable/#event-start

Two draggables and two droppables on a single page

I have two set of draggable and two sets of dropable elements.
What I want is the first set of draggable elements to be droppable only inside the first set of droppables.
The second set of draggables should be droppable only to inside the second set of droppables.
A code snippet:
// this can be dropped only inside .drop elements
$('.drag').draggable({ revert: true });
$('.drop').droppable({
drop: function() {
//
}
});
// this can be dropped only inside .drop2 elements
$('.drag2').draggable({ revert: true });
$('.drop2').droppable({
drop: function() {
//
}
});
So a user won't be able to drop element with .drag class to .drop2 container.
This is what you want.
Use Accept property of droppable widget and revert property of draggable widget to achieve this.

Multiple drag and drop in JQuery: event after dragging

I am actually trying to make a .php page where I am going to have 3 draggable elements which have to be dragged to 3 droppable elements -each draggable to a droppable, and they are unique, so one each droppable will only accept a certain draggable.
The thing is that I need to control that all of the elements have been dragged to the right spot, in which case I should redirect the user for example to success.php, otherwise, if some of the elements were dragged to the wrong droppable, the user have to go to for example failure.php.
Is there anyway for example to save a certain value in a $_SESSION in PHP in order to know that all the draggables have been dropped in the right place?
This is the code for the drag&drop:
$(function() {
$("#draggableLeiden").draggable();
$("#draggableTheHague").draggable();
$("#draggableRotterdam").draggable();
$("#droppableLeiden").droppable({
accept: '.imgLeiden',
drop: function(event, ui)
{
$(this).addClass('ui-state-highlight');
}
});
$("#droppableTheHague").droppable({
accept: '.imgTheHague',
drop: function(event, ui)
{
$(this).addClass('ui-state-highlight');
}
});
$("#droppableRotterdam").droppable({
accept: '.imgRotterdam',
drop: function()
{
$(this).addClass('ui-state-highlight');
//var activeClass = $(this).droppable('option', 'activeClass','ui-state-highlight');
}
});
});
I am trying to do this for example getting the active class of the droppable elements to see if it matches 'ui-state-highlight', but actually, that tag is gonna be executed everytime the page reloads, so if I try to insert any code into the
drop: function()
it will always execute.
Thanks a lot in advance!
Use the revert option instead. When a draggable element is dropped on anything but the accepted droppable element then it will slide back to its original spot. Does this work for you?
Are you by chance looking for ui.draggable it holds the element that was dropped?
http://jqueryui.com/demos/droppable/
$('#target').droppable({
drop : function(event,ui){
if($(ui.draggable).attr('id') == "correcttarget")
{
window.location = "yay.php";
}
else
{
window.location = "awwww.php";
}
}
})

jQuery drag and drop - how to get at element being dragged

I am using the jQuery library to implement drag and drop.
How do I get at the element that is being dragged when it is dropped?
I want to get the id of the image inside the div. The following element is dragged:
<div class="block">
<asp:Image ID="Image9" AlternateText="10/12/2008 - Retina" Width=81 Height=84 ImageUrl="~/uploads/ImageModifier/retina.jpg" runat=server />
</div>
I have the standard dropped function from their example:
$(".drop").droppable({
accept: ".block",
activeClass: 'droppable-active',
hoverClass: 'droppable-hover',
drop: function(ev, ui) { }
});
I have tried various ui.id etc. which doesn't seem to work.
Is it not the ui.draggable?
If you go here (in Firefox and assuming you have firebug) and look in the firebug console youll see I am doing a console.dir of the ui.draggable object which is the div being dragged
http://jsbin.com/ixizi
Therefore the code you need in the drop function is
drop: function(ev, ui) {
//to get the id
//ui.draggable.attr('id') or ui.draggable.get(0).id or ui.draggable[0].id
console.dir(ui.draggable)
}
$(ui.draggable).attr("id")
...
The ui.draggable() does not seem to work any more. To get the id one can use
$(event.target).attr("id");
ANSWER THAT WORKS IN 2017
A lot of time has passed by, and I found that the current accepted answer no longer works.
A solution that currently works:
$('#someDraggableGroup').draggable({
helper: 'clone',
start: function( event, ui ) {
console.log(ui.helper.context)
console.log(ui.helper.clone())
}
})
Here, ui.helper.context refers to the original object you're trying to drag, and clone() refers to the cloned version.
EDIT
The above is too see which object you're dragging using the draggable() function. For detecting what draggable object was dropped in a droppable(), the following works:
$('#myDroppable').droppable({
drop: function(event, ui){
console.log(ui.draggable.context)
OR
console.log(ui.draggable.clone() )
}
})
I tried most of the above, but in the end only
event.target.id
worked for me.
redquare is right, inside your function refer to ui.draggable:
$(".drop").droppable({ accept: ".block",
activeClass: 'droppable-active',
hoverClass: 'droppable-hover',
drop: function(ev, ui) {
//do something with ui.draggable here
}
});
That property points to the thing being dragged.
Note that if you're using cloned "helpers", the draggable will be the cloned copy, not the original.
i got
drop: function( event, ui ) {alert(ui.draggable.attr("productid"));}
How to manipulate clone object in any jquery ui operation ?
Just target ui outer html and use normal html jquery selectors
var target_ui_object_html=$(ui.item.context).attr("your attributes");
attributes => id ,class ,rel,alt ,title or custom attr like data-name
, data-user

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