I have a Multiselect as an editor in the Grid. When I click in the multiselect the popup with the choices stays hidden behind the window. 

<AdminEdit>

Workaround:

You can increase the z-index of the k-animation-container

<style>
    .k-animation-container {
        z-index: 15000;
    }
</style>


<TelerikGrid Data=@MyData EditMode="@GridEditMode.Popup" Pageable="true" Height="300px" OnUpdate="@UpdateHandler">
    <GridColumns>
        <GridColumn Field=@nameof(SampleData.ID) Editable="false" Title="ID" />
        <GridColumn Field=@nameof(SampleData.Name) Title="Name" />
        <GridColumn Field=@nameof(SampleData.Roles) Title="Position">
            <Template>
                @{
                    var item = context as SampleData;

                    @if (item.Roles.Any())
                    {
                        foreach (var role in item.Roles)
                        {
                            <span>@role</span>
                        }
                    }
                }
            </Template>
            <EditorTemplate>
                @{
                    CurrentlyEditedEmployee = context as SampleData;
                    <TelerikMultiSelect @bind-Value="@selectedValues" Data="@CurrentlyEditedEmployee.Roles"></TelerikMultiSelect>
                }
            </EditorTemplate>
        </GridColumn>
        <GridCommandColumn>
            <GridCommandButton Command="Save" Icon="save" ShowInEdit="true">Update</GridCommandButton>
            <GridCommandButton Command="Edit" Icon="edit">Edit</GridCommandButton>
        </GridCommandColumn>
    </GridColumns>
</TelerikGrid>

@code {
    List<SampleData> MyData { get; set; }
    List<string> Roles { get; set; }
    SampleData CurrentlyEditedEmployee { get; set; }

    private List<string> selectedValues { get; set; }

    public async Task UpdateHandler(GridCommandEventArgs args)
    {
        SampleData item = (SampleData)args.Item;

        // perform actual data source operations here through your service
        await MyService.Update(item);

        // update the local view-model data with the service data
        await GetGridData();
    }

    //in a real case, keep the models in dedicated locations, this is just an easy to copy and see example
    public class SampleData
    {
        public int ID { get; set; }
        public string Name { get; set; }
        public List<string> Roles { get; set; } = new List<string>() { "Test" };
    }

    async Task GetGridData()
    {
        MyData = await MyService.Read();
        Roles = await MyService.GetRoles();
    }

    protected override async Task OnInitializedAsync()
    {
        await GetGridData();
    }

    // the following static class mimics an actual data service that handles the actual data source
    // replace it with your actual service through the DI, this only mimics how the API can look like and works for this standalone page
    public static class MyService
    {
        private static List<SampleData> _data { get; set; } = new List<SampleData>();
        private static List<string> Roles = new List<string> { "Manager", "Employee", "Contractor" };

        public static async Task<List<SampleData>> Read()
        {
            if (_data.Count < 1)
            {
                for (int i = 1; i < 50; i++)
                {
                    _data.Add(new SampleData()
                    {
                        ID = i,
                        Name = "Name " + i.ToString()
                    });
                }
            }

            return await Task.FromResult(_data);
        }

        public static async Task<List<string>> GetRoles()
        {
            return await Task.FromResult(Roles);
        }

        public static async Task Update(SampleData itemToUpdate)
        {
            var index = _data.FindIndex(i => i.ID == itemToUpdate.ID);
            if (index != -1)
            {
                _data[index] = itemToUpdate;
            }
        }
    }
}

</AdminEdit>

Window border styling via css has no effect - no border shows at all - I don't need help, just reporting. Tried it on Edge, Chrome and Firefox

.MyClass { /* targets the entire popup element */

        border: 5px solid red;
    }
Microsoft Visual Studio Community 2019 Version 16.9.2
Progress® Telerik® UI for Blazor Extension - 2021.1.218.1
.NET Framework 4.8.04084

I would imagine most applications would use the Alert, Confim, Prompt concepts so it would be nice if they were built in.
It would further be nice if they were styleable and callable from c# code very similar to the wpf.
Of course as a default they could follow whatever css style is being used already.

RadWindow.Alert(text);
RadWindow.Confirm(text, () => {});
RadWindow.Prompt(text, result => {});

https://docs.telerik.com/devtools/wpf/controls/radwindow/features/predefined-dialogs

You can move a modal window past the bottom and out of view. At that point the only way to get back to it is to zoom out on the browser. Similarly, if you drag a window to the top, you can move it so high that the title bar is out of view. You can still see the bottom part of the window but even if you zoom out you can't get back to the title bar so the only thing you can do is to either escape out of the window or hope you have Ok/Cancel still visible.

---

ADMIN EDIT

Until a feature is implemented that can do this automatically (whether behind a flag like in our WebForms suite or not), you can handle the window events to check the Top and Left values and compare them with the viewport and the window size.

Here is a basic example:

<TelerikWindow Left="@TheLeft" Top="@TheTop" Draggable="true"
               LeftChanged="@LeftChangedHandler" TopChanged="@TopChangedHandler"
               Visible="true" Width="400px" Height="300px">
    <WindowTitle>Drag me!</WindowTitle>
    <WindowContent>When using Left and Top, make sure to update them in the view-model.</WindowContent>
    <WindowActions>
        <WindowAction Name="Minimize"></WindowAction>
        <WindowAction Name="Maximize"></WindowAction>
    </WindowActions>
</TelerikWindow>

@code{
    string TheLeft { get; set; } = "50px";
    string TheTop { get; set; } = "50px";

    async Task LeftChangedHandler(string currLeft)
    {
        float leftValue = float.Parse(currLeft.Replace("px", ""));
        Console.WriteLine("left " + leftValue);
        //left boundary
        if (leftValue < 0)
        {
            currLeft = "0px";
        }
        //right boundary - replace hardcoded values with current values from the viewport size
        //and take into account the dimensions of your window. This sample hardcodes values for brevity and clarity
        //you may find useful packages like this to get the viewport size https://www.nuget.org/packages/BlazorPro.BlazorSize/
        if (leftValue > 1000)
        {
            currLeft = "1000px";
        }


        TheLeft = currLeft;

        await DelayedRender();
    }

    async Task TopChangedHandler(string currTop)
    {
        float topValue = float.Parse(currTop.Replace("px", ""));
        Console.WriteLine("top: " + topValue);

        //top boundary
        if (topValue < 0)
        {
            currTop = "0px";
        }
        //bottom boundary - replace hardcoded values with current values from the viewport size
        //and take into account the dimensions of your window
        if (topValue > 600)
        {
            currTop = "600px";
        }

        TheTop = currTop;

        await DelayedRender();
    }

    async Task DelayedRender()
    {
        await Task.Run(async () =>
        {
            await Task.Delay(30);
            await InvokeAsync(StateHasChanged);
        });
    }
}

---

At the moment, a second modal window does not "block" the first.

For example, a static variable in aTelerik Window class can be used to track the z-index and render the dialog and modal background with increasing values when a new one is shown.

If you have other suggestions on handling the situation, share them below. Also, comment whether you would like that static class/variable to be public so you can set its initial value.

The Window-Component provides parameters for setting width and height.

In addition to that, it would be great if parameters for MaxWidth, MaxHeight + MinWidth, MinHeight would be provided.

I'm especially missing a MaxHeight parameter for creating popups that grow with the content (only known at runtime) but do not become larger than the screen. 
To make sure that the whole content is reachable by the users I'm setting the Height to 95vh but this leaves white space if there is not enough content to fill the screen.

Regards,

René

---

admin edit

At the moment this is not guaranteed and if you want to customize the behavior you should use a custom action to get the OnClick handler, and control the window through its parameters.

Here is an example of implementing a custom close button that also fires an event:

<TelerikWindow Visible="@IsWindowVisible" Modal="true" Centered="true">
    <WindowTitle>WindowTitle</WindowTitle>
    <WindowContent>
        lorem ipsum
    </WindowContent>
    <WindowActions>
        <WindowAction Name="MyCustomAction" Icon="close" OnClick="@HandleCancel" />
    </WindowActions>
</TelerikWindow>

@code{
    bool IsWindowVisible { get; set; } = true;

    async Task HandleCancel()
    {
        Console.WriteLine("my custom click happened");
        IsWindowVisible = false;//hide the window with your own code if you also want to do that
    }
}

I am running into an issue with what I believe is the default behaviour of the TelerikWindow, namely capturing @onkeydown - events and closing the window when the user presses escape.

Is there any way to disable this default behaviour of the dialog / overwrite its onkeydown event handler?

---
ADMIN EDIT

Include the ability to :

• Disable keyboard shortcuts altogether
• Use custom keyboard shortcuts
• Use a combination of several keys (e.g. Shift + ESC)
• Define several keyboard shortcuts at the same time for the same action

If you have any preferences how to expose this functionality please leave a comment. Any feedback on how to handle this on a Mac for the Ctrl and CMD keys is welcome (e.g. should the shortcut for the Ctrl key handle the CMD key for the Mac automatically).

In the meantime you could use the following snippet as a workaround to disable the Esc key:

@result

<TelerikButton OnClick="@ToggleWindow">Toggle the Window</TelerikButton>

<TelerikWindow Visible="@isVisible" VisibleChanged="@VisibleChangedHandler">
    <WindowTitle>
        <strong>The Title</strong>
    </WindowTitle>
    <WindowContent>
        This is my window <strong>popup</strong> content.
    </WindowContent>
    <WindowActions>
        <WindowAction Name="MyCustomClose" Icon="@IconName.Close" OnClick="@MyCustomCloseHandler" />
    </WindowActions>
</TelerikWindow>

@code {
    bool isVisible { get; set; }
    string result { get; set; }

    void VisibleChangedHandler(bool currVisible)
    {
        // if you don't do this, the window won't close because of the user action
        // so if you don't update the view-model here, the window will not close when Esc is pressed

        //isVisible = currVisible;

        result = $"the window is now visible: {isVisible}";

        Console.WriteLine($"Closing because of Esc key");
    }

    void MyCustomCloseHandler()
    {
        //will fire on click only
        isVisible = false;
        //since the built-in window UI didn't invoke this change, the event will not fire
    }

    public void ToggleWindow()
    {
        isVisible = !isVisible;

        result = $"the window is now visible: {isVisible}";
    }
}

---

I'm working on blazor server side application.
After update Telerik.UI.for.Blazor from 2.1 to 2.5 (before I updated .net core from 3.0 to 3.1) it shows following error:
InvalidOperationException: The current thread is not associated with the Dispatcher. Use InvokeAsync() to switch execution to the Dispatcher when triggering rendering or component state.

I investigated that it's cause by Telerik window.
The error occurs when window is on start page or when the page is refreshed.
Below code for Index.razor which cause the error:

I would like to be to allow the user to resize the Blazor Telerik Window component to their individual liking. For example, like a resizable textbox but for a window/modal. I would assume this would function the same way as I would resize a window in Windows OS by dragging the corner or sides of an open window.

Currently, when the window is minimized the content is lost. The content area is detached from the DOM and re-initialized when it is shown again.

<AdminEdit>

Workaround:

You can workaround that issue by creating custom minimize and maximize actions for the window, where you hide the content area with CSS.

Code snippet:

<TelerikWindow Class="@( isMinimized ? "minimize-window" : "maximize-window" )"
               Width="500px"
               Height="@Height"
               Top="40%"
               Left="45%"
               Visible="true">
    <WindowTitle>
        <strong>Status</strong>
    </WindowTitle>
    <WindowActions>
        <WindowAction Name="MyCustomMinimize" OnClick="@CustomMinimize" Icon="@IconName.WindowMinimize"></WindowAction>
        @if (isMinimized)
        {
            <WindowAction Name="MyCustomMaximize" OnClick="@CustomMaximize" Icon="@IconName.Window"></WindowAction>
        }
        <WindowAction Name="Close"></WindowAction>
    </WindowActions>
    <WindowContent>
        <form class="k-form">
            <fieldset class="k-form-fieldset">
                <legend class="k-form-legend">User Details</legend>

                <label class="k-form-field">
                    <span>First Name</span>
                    <input class="k-textbox" placeholder="Your Name" />
                </label>
                <label class="k-form-field">
                    <span>Last Name</span>
                    <input class="k-textbox" placeholder="Your Last Name" />
                </label>
            </fieldset>
        </form>
    </WindowContent>
</TelerikWindow>

@code {
    public bool isMinimized { get; set; }

    public string Height { get; set; } = "350px";

    private void CustomMinimize()
    {
        isMinimized = true;
        Height = "auto";
    }

    private void CustomMaximize()
    {
        isMinimized = false;
        Height = "350px";
    }

}

<style>
    .minimize-window .k-content {
        display: none;
        padding: 0px !important;
    }

    .maximize-window .k-content {
        display: block;
        padding: 16px 16px;
    }
</style>

</AdminEdit>

When I host a TelerikWindow in a component that is itself hosted in a TelerikWindow the main window does not display.

VS shows continuous, never ending, memory consumption.

This behavior just started with the 2.0.0 release.

Dear team,

we use a BlazoredTypeahead control inside a TelerikWindow and have this problem.

When you open the result dropdown of BlazoredTypeahead and click on the scrollbar in the result dropdown, the result dropdown is closed suddenly.

This only happens when a BlazoredTypeahead control is inside a TelerikWindow. If I remove the Telerik Window everything works as expected.

Attached is a running example, which demonstrates the issue. In the example just click on the "New" button in the grid, this will open the TelerikWindow, which contains the BlazoredTypeahead control.

Thanks for your help.

Can we please have an [Open] or [Init] or [OnVisible] event exposed for Blazor Windows?

There is a whole bunch of stuff that I need to do in a Window (e.g. custom modal editing form that needs a lot of temporary supporting data structures) and I am having to do the work in a method that that opens the window, before the Window is opened and passing many data structures to the Window as parameters (there could be more than 20 of these). This is messy.

It would be much simpler, neater and efficient to have the Window create these resources on the fly when the Window is made visible and to dispose of them when the window closes. I would then only need to pass a few essential parameters.

I'm guessing this is a new feature request because I cannot see any way of detecting, in the code for a Window, that it has just been opened (or am I missing something?).

Kind regards,

Paul

==============

Counter.razor:

==============

@page "/counter"

<h1>Counter</h1>

<p>Current count: @currentCount</p>

<button class="btn btn-primary" @onclick="IncrementCount">Click me</button>

<button class="btn btn-danger" @onclick="OpenMiniWin">Open a kendo window</button>

<TelerikButton>Say Hello</TelerikButton>

<div>
    <ul>
        <li>All work and no play makes Jack a dull boy</li>
        <li>All work and no play makes Jack a dull boy</li>
        <li>All work and no play makes Jack a dull boy</li>
    </ul>
</div>


<Tree IsSpecialIcons="true"></Tree>

<TelerikWindow Modal="true" Visible="@isVisibleMiniWin">
    <WindowTitle>
        <strong>The Title</strong>
    </WindowTitle>
    <WindowContent>
        I am modal so the page behind me is not available to the user.
    </WindowContent>    
    <WindowActions>
        <WindowAction Name="Minimize" />
        <WindowAction Name="Maximize" />
        <WindowAction Name="Close" />
    </WindowActions>
</TelerikWindow>



@code {
    int currentCount = 0;
    bool isVisibleMiniWin = false;

    void IncrementCount()
    {
        currentCount++;
    }

    void OpenMiniWin()
    {
        isVisibleMiniWin = true;
    }
}

==============

Tree.razor:

==============

<TelerikTreeView Data="@FlatData" >
    <TreeViewBindings>
        <TreeViewBinding IdField="Id" ParentIdField="ParentIdValue" ExpandedField="Expanded" TextField="Text" HasChildrenField="HasChildren" IconField="Icon" />
    </TreeViewBindings>
</TelerikTreeView>

@code {
    public class TreeItem
    {
        public int Id { get; set; }
        public string Text { get; set; }
        public int? ParentIdValue { get; set; }
        public bool HasChildren { get; set; }
        public string Icon { get; set; }
        public bool Expanded { get; set; }
    }

    [Parameter]
    public bool IsSpecialIcons { get; set; } = false;

    public IEnumerable<TreeItem> FlatData { get; set; }

    protected override void OnInitialized()
    {
        LoadFlatData();
    }

    private void LoadFlatData()
    {
        List<TreeItem> items = new List<TreeItem>();

        items.Add(new TreeItem()
        {
            Id = 1,
            Text = "Project",
            ParentIdValue = null,
            HasChildren = true,
            Icon = "folder",
            Expanded = true
        });

        items.Add(new TreeItem()
        {
            Id = 2,
            Text = "Design",
            ParentIdValue = 1,
            HasChildren = true,
            Icon = "brush",
            Expanded = true
        });
        items.Add(new TreeItem()
        {
            Id = 3,
            Text = "Implementation",
            ParentIdValue = 1,
            HasChildren = true,
            Icon = "folder",
            Expanded = true
        });

        items.Add(new TreeItem()
        {
            Id = 4,
            Text = "site.psd",
            ParentIdValue = 2,
            HasChildren = false,
            Icon = "psd",
            Expanded = true
        });
        items.Add(new TreeItem()
        {
            Id = 5,
            Text = "index.js",
            ParentIdValue = 3,
            HasChildren = false,
            Icon = "js"
        });
        items.Add(new TreeItem()
        {
            Id = 6,
            Text = "index.html",
            ParentIdValue = 3,
            HasChildren = false,
            Icon = "html"
        });
        items.Add(new TreeItem()
        {
            Id = 7,
            Text = "styles.css",
            ParentIdValue = 3,
            HasChildren = false,
            Icon = "css"
        });

        FlatData = items;
    }
}