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javascriptjqueryjquery-uijquery-ui-draggablejquery-ui-droppable

JQuery UI: Get ID of source element in drag'n'dop


I am impelemnting a drag'n'drop where you can drag users to a role. I know how I get the user ID and the target role ID but I do not know how to get the role ID where the user is dragged FROM!

<div id="role_1" class="role">
    <h5>Administrator</h5>
    <ul class="users">
        <li id="user_1">Foo</li>
        <li id="user_2">Bar</li>
    </ul>
</div>
<div id="role_2" class="role">
    <h5>Member</h5>
    <ul class="users">
        <li id="user_1337">Baz</li>
    </ul>
</div>

<script type="text/javascript">
$(function() {
    // Get roles and users lists
    var $templates = $(".role"),
        $users = $(".users");

    // let the user items be draggable
    $("li", $users).draggable({
        revert: "invalid", // when not dropped, the item will revert back to its initial position
        containment: "document",
        helper: "clone",
        cursor: "move"
    });

    // let the roles be droppable, accepting the user items
    $templates.droppable({
        accept: ".users > li",
        activeClass: "ui-state-highlight",
        drop: function(event, ui) {
            var $uid = ui.draggable.attr("id"),
                $targetRid = $(this).attr("id"),
                $sourceRid = ???;
                // snip
        }
    });
});
</script>

Thanks for your help in advance.


Solution

  • Hook the start event, and get the closest .role:

    $("li", $users).draggable({
        revert: "invalid", // when not dropped, the item will revert back to its initial position
        containment: "document",
        helper: "clone",
        cursor: "move",
        start: function() {
            var role = $(this).closest(".role").attr("id");
            // Here, role is either the id or undefined if no role could be found
        }
    });
    

    If you need that information when it's dropped, you could store it on the element using data in the start event and then retrieve it when dropped.