Jquery – Prevent drop of list item in JqueryUI sortable

drag and dropjqueryjquery-uijquery-ui-sortable

I have two lists #sortable1 and #sortable 2 which are connected sortables, as shown in this example.

You can drag and drop list items from sortable1 to sortable 2. However, if an item in sortable 1 contains the class "number", I want to prevent the drop on Sortable2 and thus make the dragged item drop back into sortable 1.

I have used the following on sortable2:

receive: function (event, ui) {
            if ($(ui.item).hasClass("number")) {
                $(ui.item).remove();
            }

but it deletes the list item from both tables altogether. Any help will be appreciated.

Best Answer

For anyone reading this in future, as mentioned by briansol in comments for the accepted answer, it throws error

Uncaught TypeError: Cannot read property 'removeChild' of null

The the documentation particularly says

cancel()

Cancels a change in the current sortable and reverts it to the state prior to when the current sort was started. Useful in the stop and receive callback functions.

Canceling the sort during other events is unreliable, So it's better use the receive event as shown in Mj Azani's answer or use the stop event as follows:

$('#list1').sortable({
  connectWith: 'ul',
  stop: function(ev, ui) {
    if(ui.item.hasClass("number"))
      $(this).sortable("cancel");
   }
}); 

$('#list2').sortable({
   connectWith: 'ul',
});

Demo

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You want the splice function on the native array object.

arr.splice(index, 0, item); will insert item into arr at the specified index (deleting 0 items first, that is, it's just an insert).

In this example we will create an array and add an element to it into index 2:

var arr = [];
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Javascript – jQuery UI Sortable — How to cancel the click event on an item that’s dragged/sorted

I had the same problem and since my sortable items contained three or four clickable items (and the number was variable) binding/unbinding them on the fly didn't really seem an option. However, by incident I specified the

helper : 'clone'

option, which behaved identically to the original sortable in terms of interface but apparently does not fire click events on the dragged item and thus solves the problem. It's as much a hack as anything else, but at least it's short and easy..

Best Answer

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