问题描述:

I have Kendo TreeView in which parent nodes have children nodes.

Rules that I want are that a user can

  1. Drag parent node above or below the current position , thus change the sort order
  2. Not allow a parent to be dragged onto another parent node
  3. Not allow a parent to be dragged onto any child node
  4. DO allow a child node item to be dragged under another parent node

I certainly prefer javascript or jquery

This code simply prevents all parent nodes from being dragged and thus it is not want I am wanting. Anyone have any samples on this?

 $(".k-treeview").data("kendoTreeView").bind("dragstart", function (e) {

if ($(e.sourceNode).parentsUntil(".k-treeview", ".k-item").length == 0) {

e.preventDefault();

}

});

UPDATE from answer

Seems that almost all the code it working correcting from the answer if I place it in my $(document).ready(function() { ...

But If I place that code under the onDrop is does not get called up.

e.g.

 var treeview = $("#treeview").kendoTreeView({

expanded: true,

dragAndDrop: true,

select: onSelect,

loadOnDemand: false,

dataSource: homogeneous,

dataTextField: "ReportGroupName",

template: kendo.template($("#treeview-template").html()) //,

,

onDrop: function(e) {

kendoTreeView = $(".k-treeview").data("kendoTreeView");

kendoTreeView.bind("drag", function (e) {

//Check if we're trying to add the node as a child

var dropAsChild = $(e.dropTarget).hasClass("k-in k-state-hover");

var sourceDataItem = kendoTreeView.dataItem(e.sourceNode);

var destinationDataItem = kendoTreeView.dataItem(e.dropTarget);

if ($(e.sourceNode).is(e.dropTarget)) {

//Dropping on itself

e.setStatusClass("k-denied");

} else if (destinationDataItem && !dropAsChild) {

//Dropping as a sibling... that's ok if it's the same parent

if (sourceDataItem.parent().uid != destinationDataItem.parent().uid) {

//Not the same parent

e.setStatusClass("k-denied");

}

} else {

e.setStatusClass("k-denied");

}

});

}

}).data("kendoTreeView");

IMAGE

Here is an image red arrow is pointing at child that I was to move to another parent ( to be a child of that parent with blue arrow)

网友答案:

The problem with the dragstart event is that it won't provide you the drop target as it's to early in the event sequence.

The best way to do achieve this would be to deny the drop action based on the source and destination node. You can do this by calling the setStatusClass (with a k-denied) on the event object passed to the drag event.

var treeview = $("#treeview").kendoTreeView({
    expanded: true,
    dragAndDrop: true,
    select: onSelect,
    loadOnDemand: false,
    dataSource: homogeneous,
    dataTextField: "ReportGroupName",
    template: kendo.template($("#treeview-template").html()),
    drag: function (e) {
        //Check if we're trying to add the node as a child
        var kendoTreeView = $("#treeview").data("kendoTreeView");
        var dropAsChild = $(e.dropTarget).hasClass("k-in k-state-hover");

        var sourceDataItem = kendoTreeView.dataItem(e.sourceNode);
        var destinationDataItem = kendoTreeView.dataItem(e.dropTarget);

        if ($(e.sourceNode).is(e.dropTarget)) {
            //Dropping on itself
            e.setStatusClass("k-denied");
        } else if (destinationDataItem && !dropAsChild) {
            //Dropping as a sibling... that's ok if it's the same parent
            if (sourceDataItem.parent().uid != destinationDataItem.parent().uid) {
                //Not the same parent
                e.setStatusClass("k-denied");
            }
        } else {
            e.setStatusClass("k-denied");
        }
    }
}).data("kendoTreeView");

I can't test the code above right now so they may be some error... I'm sure you'll still understand the logic behind it.

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