jquery remove from droppable when dragged out

问题

I have implemented jQuery's draggable and droppable based on the example shopping cart demo. I would like to be able to remove the <li> from the droppable when you drag it out of the droppable. I thought this might have something to do with the droppable out event but the ui parameter is empty. Does anyone know the solution?

回答1:

This is a complete working solution, not completly tested, you should still debug it maybe: {reassign draggable to dropped element to fired drop out event} {you should reassign droppable too!}

SEE DEMO

EDITABLE DEMO

$(function () {
    $("#catalog").accordion();
    $("#catalog li").draggable({
        appendTo: "body",
        helper: "clone"
    });
    $("#cart ol").droppable({
        out: function (event, ui) {
            var self = ui;
            ui.helper.off('mouseup').on('mouseup', function () {
                $(this).remove();
                self.draggable.remove();
            });
        },
        activeClass: "ui-state-default",
        hoverClass: "ui-state-hover",
        accept: ":not(.ui-sortable-helper)",
        drop: function (event, ui) {
            if (ui.draggable.is('.dropped')) return false;
            $(this).find(".placeholder").remove();
            $("<li></li>").text(ui.draggable.text()).appendTo(this).draggable({
                appendTo: "body",
                helper: "clone"
            }).addClass('dropped');
        }
    }).sortable({
        items: "li:not(.placeholder)",
        sort: function () {
            // gets added unintentionally by droppable interacting with sortable
            // using connectWithSortable fixes this, but doesn't allow you to customize active/hoverClass options
            $(this).removeClass("ui-state-default");
        }
    });


});

回答2:

You can use CSS to change the list style. Something like this should work:

.ui-droppable .ui-sortable ol { list-style: none outside none; }

or better yet

#cart ol { list-style: none outside none; }

Hope this helps!

回答3:

A.Wolff's solution got me on the right track, but using the sortable.out function via Drew's solution from this post: How to remove an item that is pulled away from it's list? is a better solution

$(function () {
    var removeIntent = false;
    
    $("#catalog").accordion();
    $("#catalog li").draggable({
        appendTo: "body",
        helper: "clone"
    });
    $("#cart ol").droppable({
        activeClass: "ui-state-default",
        hoverClass: "ui-state-hover",
        accept: ":not(.ui-sortable-helper)",
        drop: function (event, ui) {
            $(this).find(".placeholder").remove();
            $("<li></li>").text(ui.draggable.text()).appendTo(this);
        }
    }).sortable({
        items: "li:not(.placeholder)",
        sort: function () {
            // gets added unintentionally by droppable interacting with sortable
            // using connectWithSortable fixes this, but doesn't allow you to customize active/hoverClass options
            $(this).removeClass("ui-state-default");
        },
        over: function () {
            removeIntent = false;
        },
        out: function () {
            removeIntent = true;
        },
        beforeStop: function (event, ui) {
            if(removeIntent == true){
                ui.item.remove();   
            }
        }
    });


});

来源：https://stackoverflow.com/questions/16305713/jquery-remove-from-droppable-when-dragged-out