We are trying to make our website accessible using Wave and one thing we are struggling with is TreeViews with checkboxes enabled. Sometimes the checkbox is rendered as a span element and sometimes as an input element. In the second case Wave is recognizing an error for each node as the input element is not associated with its neighbouring text. You can see this on your own website: https://demos.telerik.com/aspnet-ajax/treeview/examples/functionality/checkboxes/defaultcs.aspx. For the server side tree the checkboxes are rendered as inputs and there is no label associated with it.

This behaviour doesn't change when I set EnableAriaSupport="true".

I have enabled aria settings for the treeview control, but when I am trying to navigate via key board it announces some thing like  {level} {selected value/text} {checked/not checked} or {selected value/text} {checked/not checked} {level},

I don't want {checked/not checked}, to be announced.

http://screencast.com/t/CySy2iAoiG4n

Reproduction: 

• online demo - https://demos.telerik.com/aspnet-ajax/treeview/examples/functionality/draganddropnodes/defaultcs.aspx 
• code:

  <telerik:RadTreeView runat="server" RenderMode="Lightweight" ID="RadTreeView2" EnableDragAndDrop="true" EnableDragAndDropBetweenNodes="true">

Workaround from admin: Use the following OnClientLoad client-side event handler for the RadTreeView

function OnClientLoad(sender) {
    if ($telerik.isTouchDevice && Telerik.Web.Platform.android) {
        $telerik.$(sender.get_element()).off("scroll")
    }
}

On IPAD, for treeview rootnode when expanded. It calls the client side event, fetches the records from the service and do the databinding as exected. But after completing all the binding ClientNodeCollapsing event is fired which causes the node to collapse.


Same control works fine on desktop.

Reproduction:
Subscribe to Node Click event and set EnableDragAndDrop=true.

Temporary Workaround: Placing the following script below the ScriptManager:

var $ = $telerik.$,
$T = Telerik.Web.UI,
$J = Sys.Serialization.JavaScriptSerializer,
CLICK = $telerik.isTouchDevice ? "touchend" : "click",
MOUSEDOWN = $telerik.isTouchDevice ? "touchstart" : "mousedown",
MOUSEMOVE = $telerik.isTouchDevice ? "touchmove" : "mousemove",
MOUSEUP = $telerik.isTouchDevice ? "touchend" : "mouseup",
DOMActivate = "DOMActivate",
treeviewRegEx;

Telerik.Web.UI.RadTreeView.prototype._click = function (e) {
    if (this._eventMap.skipElement(e, "rtIn"))
        return;
    if (this._preventClick) {
        // Dragging and dropping over the same node produces unwanted click
        this._preventClick = false;
        return;
    }

    var node = this._extractNodeFromDomElement(e.eventMapTarget);
    if ($telerik.isTouchDevice) {
        if (!this._treeTouchScroll._dragCanceled) {
            clearTimeout(this.longTouchID);
            this.longTouchID = 0;
        }
        /*if (this._scrolledInMobileDevice) {
                           
            this._scrolledInMobileDevice = false;
            return;
        }
        else */ if (this._dragging) {
            return;
        }
    }


    if (this._raiseCancelEvent("nodeClicking", node, e)) {
        e.preventDefault();
        return;
    }
                    
    if (!node.get_isEnabled()) {
        this._raiseEvent("nodeClicked", node, e);
        e.preventDefault();
        return;
    }

    var ctrlKey = e.ctrlKey || e.rawEvent && e.rawEvent.metaKey;

    this._hideContextMenus();

    if (this.get_multipleSelect() && (ctrlKey || e.shiftKey || $telerik.isTouchDevice)) {
        if ($telerik.isTouchDevice) {
            if (node && node.get_isEnabled() && !this._touchDragEnd) {
                node.set_selected(!node.get_selected());
            }
            this._touchDragEnd = false;
        }

        if (ctrlKey) {
            node.set_selected(!node.get_selected());
        }
        else if (e.shiftKey) {
            this._handleShiftSelection(node);
        }

        this._raiseEvent("nodeClicked", node, e);
        return;
    }
    else {
        if (this.get_allowNodeEditing() && node.get_selected() && node.get_allowEdit()) {
            this._clearSelectedNodes();
            node.set_selected(true);
            this._startEdit(node, e);
            e.preventDefault();
            e.stopPropagation();
        }
        else {
            this._clearSelectedNodes();
            node.set_selected(true);
        }
    }

    this._raiseEvent("nodeClicked", node, e);

    this._postClickCommand(node);
}
function fixGridSchedulerComboBoxDropDownList() {
    // https://www.telerik.com/support/kb/aspnet-ajax/details/cannot-scroll-telerik-control-in-ios-11.3---the-page-scrolls-instead
    var fixed = $telerik.$(".RadTreeView.RadTouchExtender");
    fixed.on('touchmove', function (e) {
        e.preventDefault();
    });
}
Sys.Application.add_load(fixGridSchedulerComboBoxDropDownList);

The ClientNodeClicking and server-side NodeClick events are triggered when tap-to-scroll the Treeview in Android (taphold event).

Steps to reproduce:
1. Open http://demos.telerik.com/aspnet-ajax/treeview/examples/overview/defaultcs.aspx in mobile Chrome of Android device (or in Chrome emulator)
2. Tap over a node to Scroll the Treeview

Result - the tapped node gets selected

Expected - the Treeview detect the tap from holdtap events and the node is not selected when scrolling occurs

Workaround: 

function OnClientLoad(sender, args) {
    sender._isEditableElementInTemplate = function (target) {

        return target && $(target).closest(".rtTemplate").length > 0 &&
                (target.tagName.toUpperCase() == 'INPUT' ||
                target.tagName.toUpperCase() == 'TEXTAREA' ||
                (target.isContentEditable));
    }
}

<telerik:RadTreeView OnClientLoad="OnClientLoad" ID="RadTreeView1" runat="server" ... >

The TreeView wrapper is not expanded depending on its nodes width when used in LightWeight render mode. As a result of that the horizontall scrollers of the control's parent element are never shown thus the nodes of the control appear truncated.


The problem can be reproduced with the following configuration:
ASPX:

        <div style="width: 100px; height: 400px; border: 1px solid black; overflow: auto;">
            <telerik:RadTreeView ID="RadTreeView" runat="server" RenderMode="Lightweight">
            </telerik:RadTreeView>
        </div>

C#:

    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            string[] cars = new string[] { "Porsche Carrera", "Ferrari F430", "Aston Martin DB9 and some more words foe a long node" };
            RadTreeView.DataSource = cars;
            RadTreeView.DataBind();
        }
    }