Completed
Last Updated: 26 Jul 2022 08:11 by ADMIN
I am using a Groupable ComboBox and I would like access to the list of the available groups so that I can create a custom group name sort order.
Completed
Last Updated: 12 Jul 2022 07:27 by ADMIN
Release 3.5.0
Created by: Kristofer
Comments: 0
Category: ComboBox
Type: Bug Report
1

If my browser culture is set to Swedish, I can no longer tab through multiple ComboBoxes.

 

<AdminEdit>

You can manually add the TabIndex parameter to each ComboBox and set their values to non-negative integers.

</AdminEdit>

Unplanned
Last Updated: 11 Jul 2022 22:29 by Kees

If the AllowCustom parameter is set to true and the OnChange fires during the data load, the value in the OnChange handler is null. Press Enter before the data load ends and the OnChange handler will give null instead of the current input value.

If I enter a text and press enter when there are no items (yet), I expect it to call the OnChange with that text. Even with a static list of zero items (replace 'Read=' with 'Data=' en provide a new List<>()), the OnChange is passed a null value.

If the OnChange fires before the empty dropdown get opened, it passes a null value, if it fires after the empty dropdown opens, it passes the entered text. That doesn't sound logical to me. Why needs the (empty) dropdown to be open before the data gets passed? And if that is necessary, why gets the OnChange fired before the dropdown is opened, and doesn't wait till it is open and then fire with the entered data?

Unplanned
Last Updated: 30 Jun 2022 01:30 by n/a

I would like to use an event that fires only when the user clicks on an item from the dropdown. 

=====

ADMIT EDIT:

Here is a possible way to achieve this now:

<TelerikComboBox @bind-Value=@SelectedValue
                 Data="@ComboBoxData"
                 ValueField="ProductId"
                 TextField="ProductName">
    <ItemTemplate>
        @{
            var currentItem = context as Product;

            <div onclick="@(() => OnClickHandler(currentItem))" style="width:100%">
                @currentItem.ProductName
            </div>
        }
    </ItemTemplate>
</TelerikComboBox>

@code {
    private void OnClickHandler(Product item)
    {
        //the application logic here
    }

    public IEnumerable<Product> ComboBoxData { get; set; }
    public int SelectedValue { get; set; } = 2;

    protected override void OnInitialized()
    {
        List<Product> products = new List<Product>();
        for (int i = 1; i < 10; i++)
        {
            products.Add(new Product()
                {
                    ProductId = i,
                    ProductName = $"Product {i}",
                    UnitPrice = (decimal)(i * 3.14)
                });
        }

        ComboBoxData = products;
        base.OnInitialized();
    }

    public class Product
    {
        public int ProductId { get; set; }
        public string ProductName { get; set; }
        public decimal UnitPrice { get; set; }
    }
}

Unplanned
Last Updated: 21 Jun 2022 16:45 by Adam

I have a ComboBox that allows me to select different entities that I want to edit data for.  Some of this data involves selecting other options from ComboBoxes.  When I type in my cascading filterable ComboBox to select an item, its value changes accordingly, but when I change the entity I'm editing, that ComboBox doesn't display the selected value, even though there is a selected value present.

Reproduction: https://blazorrepl.telerik.com/GGYgmlFA45guzWlg06.

Steps to reproduce:

  1. Run the snippet - selected Person is Adam
  2. Start typing "Green" in the Fav Colour ComboBox
  3. Press Enter to select it
  4. Change the Person to John
  5. Fav Colour appears empty while it should display "Yellow"
Completed
Last Updated: 31 May 2022 06:54 by ADMIN
Release 3.4.0

In my data, I have multiple identical values for the TextField of the ComboBox. When the user selects one of them and focuses away from the component the selected value changes to the first instance of the items with the same TextFields, although they have different ValueFields.

Reproduction:

<TelerikComboBox Data="@myDdlData" 
                 TextField="MyTextField" 
                 ValueField="MyValueField" 
                 Value="selectedValue" 
                 ValueChanged="@((int? id) => ValueChangedHandler(id))" 
                 FilterOperator="StringFilterOperator.Contains"
                 Filterable="true">
</TelerikComboBox>

@code {
    private List<MyDdlModel> myDdlData { get; set; }

    private void ValueChangedHandler(int? id)
    {
        selectedValue = id;
    }

    public class MyDdlModel
    {
        public int? MyValueField { get; set; }
        public string MyTextField { get; set; }
    }

    int? selectedValue { get; set; }

    protected override void OnInitialized()
    {
        myDdlData = new List<MyDdlModel>()
        {
            new MyDdlModel()
            {
                MyValueField = 1,
                MyTextField = "John Smith"
            },
            new MyDdlModel()
            {
                MyValueField = 2,
                MyTextField = "John Smith"
            },
            new MyDdlModel()
            {
                MyValueField = 3,
                MyTextField = "John Smith"
            },
            new MyDdlModel()
            {
                MyValueField = 4,
                MyTextField = "Alice Jones"
            },
            new MyDdlModel()
            {
                MyValueField = 5,
                MyTextField = "Alice Jones"
            },
        };
    }
}

Unplanned
Last Updated: 30 May 2022 12:12 by Miroslav

Description

When the user types a value in the input and wishes to navigate to the beginning or end (by pressing Home/End buttons) of the input to make a correction, a value from the popup is actually selected and the value in the input is overridden.

Reproduction

1. Create a ComboBox and enable filtering.

2. Start typing in the input. Popup is opened.

3 Try to navigate in the input via the Home/End buttons. A value from the popup is selected that overrides the value in the input. 


Unplanned
Last Updated: 24 May 2022 13:45 by ADMIN
Created by: Harrison
Comments: 1
Category: ComboBox
Type: Feature Request
4

Hi Telerik Team,

One of the requirements for my team project is that the ComboBox needs to be sorted in descending order to list dates. We need to sort the groups and the options inside the groups.

Ideally, the ComboBox can have a SortDirection parameter that defines the order as SortAscending or SortDescending, and can display the ComboBox groups and options accordingly.

Completed
Last Updated: 06 May 2022 13:23 by ADMIN
Release 3.3.0

A ComboBox is databound via OnRead. It has an initial value, but no data arrives after the first OnRead call. We call Rebind() to fetch data and then it populates, but the component value doesn't show.

Click the button. The ComboBox should show its initial value, but doesn't. A similar scenario worked until version 2.30, when there was no Rebind(), but we set Data directly.

The workaround is to set raise a flag in OnRead and set the value in OnAfterRenderAsync.

@using Telerik.DataSource.Extensions

<TelerikButton OnClick="@BindCombo">Rebind Combo</TelerikButton>

<TelerikComboBox TItem="@ComboItem"
                 TValue="int"
                 @ref="@ComboRef"
                 TextField="Text"
                 ValueField="Id"
                 OnRead="OnComboRead"
                 Width="200px"
                 @bind-Value="@ComboValue">
</TelerikComboBox>

@code {
    string FilterValue { get; set; } = "A";
    int ComboValue { get; set; } = 2;
    bool BindFlag { get; set; }
    bool ShouldResetValue { get; set; }
    IEnumerable<ComboItem> LegacyComboData { get; set; }

    TelerikComboBox<ComboItem, int> ComboRef { get; set; }

    void BindCombo()
    {
        BindFlag = true;
        ComboRef.Rebind();
    }

    protected override async Task OnAfterRenderAsync(bool firstRender)
    {
        if (ShouldResetValue)
        {
            // comment out the initially set value above to make the following line work
            ComboValue = 2;
            StateHasChanged();
        }

        await base.OnAfterRenderAsync(firstRender);
    }

    async Task OnComboRead(ComboBoxReadEventArgs args)
    {
        if (BindFlag)
        {
            var service = new MyService();

            var data = await service.GetComboItem(FilterValue);
            var result = await data.ToDataSourceResultAsync(args.Request);

            args.Data = result.Data;

            //ShouldResetValue = true;
        }
    }

    public class ComboItem
    {
        public int Id { get; set; }
        public string Code { get; set; }
        public string Text { get; set; }
    }

    public class MyService
    {
        public async Task<IEnumerable<ComboItem>> GetComboItem(string code)
        {
            await Task.Delay(300);

            var data = new[]
            {
                    new ComboItem{ Id = 1, Code = "A", Text = "ValueA1" },
                    new ComboItem{ Id = 2, Code = "A", Text = "ValueA2" },
                    new ComboItem{ Id = 3, Code = "A", Text = "ValueA3" },
                    new ComboItem{ Id = 4, Code = "B", Text = "ValueB4" },
                    new ComboItem{ Id = 5, Code = "B", Text = "ValueB5" },
                    new ComboItem{ Id = 6, Code = "B", Text = "ValueB6" },
                    new ComboItem{ Id = 7, Code = "C", Text = "ValueC7" },
                    new ComboItem{ Id = 8, Code = "C", Text = "ValueC8" },
                    new ComboItem{ Id = 9, Code = "C", Text = "ValueC9" },
                };

            return data.Where(x => x.Code == code).ToList();
        }
    }
}

 

Completed
Last Updated: 04 May 2022 07:40 by ADMIN
Release 3.3.0

The ComboBox will not display an initial selected item, if the value is equal to the type's default. Applies to integers, guids, etc.

This used to work until version 2.30.

Here is a REPL test page.

If the value type is nullable, a zero int value will work for initial item selection.

Declined
Last Updated: 23 Mar 2022 11:06 by ADMIN
Created by: John af P
Comments: 3
Category: ComboBox
Type: Feature Request
2

Hello, I would like to have a mutiselect dropdown like you have for ajax:

https://demos.telerik.com/aspnet-ajax/combobox/examples/functionality/checkboxes/defaultcs.aspx

Syncfusion and radzen have this support for blazor :

https://blazor.syncfusion.com/demos/multiselect-dropdown/checkbox?theme=bootstrap5

https://blazor.radzen.com/dropdown

I know that you have a proposed solution for the MultiSelect component:

CheckBox in Multiselect

But the design of this one is not what I'm after, the box still expands downwards when selecting multiple items and it makes it hard to design a coherent page that does not make the dom "jump around". Also the implementation is cumbersome for more complex objects .

It would be better with a solution like you have for ajax where it just shows the first items that fits and then "+X items".

Declined
Last Updated: 22 Mar 2022 09:44 by ADMIN
I have bound the ComboBox to a List<int> and when I set the FIlterable parameter to true, I get an application crash. I would like to be able to filter by integers too. 
Declined
Last Updated: 26 Jan 2022 04:08 by ADMIN

See this REPL:

https://blazorrepl.telerik.com/QmOFQTbW46QegjwX11

Run the program and scroll so that new data will be requested.  The page variable does not change, so I'm not able to request new data from my datasource.

Planned
Last Updated: 06 Jan 2022 06:27 by ADMIN
Created by: Andrew
Comments: 2
Category: ComboBox
Type: Feature Request
27

I would like to change the text in the ComboBox dropdown when there is no data in the source collection.

At the moment the only option is through localization for all instances like here.

Completed
Last Updated: 16 Dec 2021 06:20 by ADMIN

GitHub Repo - https://github.com/benhysell/BlazorGridPagingIssue

Expected Behavior - In the ComboBox ItemTemplate show the user's email address along with user name

Actual Behavior - Works fine debugging in Visual Studio, however in a published application the browser throws exception and will not display user's email address in the ItemTemplate.

Steps To Reproduce

  • Clone and start debugging application
  • Navigate to https://localhost:5001/createWeather
  • This is a simple form with two ComboBoxes, one for weather data and one for user data
  • In debug the ComboBoxes work as expected, each has an ItemTemplate that shows the desired data.
  • Stop debugging and publish the applicaiton
  • ie -- dotnet publish -o "YOUR DESIRED OUPUT DIRECTORY" -r win-x64 --self-contained
  • Navigate to the output directory and run .\BlazorGrid.Server.exe
  • In the browser navigate to https://localhost:5001/createWeather
  • The page now throws an exception
  • Also notice how the user's email address is no longer shown for the User in the comobobox drop down.

Details

Ran across this in a larger application...I have a class that inherits from Microsoft.AspNetCore.Identity.IdentityUser<Guid> and wanted to display all of my users in a ComboBox with a custom ItemTemplate consisting of the Name and Email.  This works great in debug, however every time I publish/deploy the Email address is not shown.  The example repo is a stripped down version of the larger application reproducing the error.

The application is making an OData call to the backend to retrieve the Users...in the repo we do not goto a database, in the live application we do.  In both instances the user's Email is not shown in the ItemTemplate, even though one can see via the browser's network traffic tab the results from the OData call include the email address for the users.

This issue does not just affect the email property, I was unable to get any of the properties listed on Microsoft.AspNetCore.Identity.IdentityUser<Guid> to render in a published application in the ItemTemplate for the Combobox. 

Note - all of the properties in Microsoft.AspNetCore.Identity.IdentityUser<Guid> are marked as 'virtual'.  I attempted to re-create this issue with a different class, in the repo I used the WeatherForecast class and created a virtual TemperatureK property...this however worked in debug and release without issue.  One can see this in the OData Weather Forecasts ComboBox on the same page, https://localhost:5001/createWeather.

Completed
Last Updated: 05 Dec 2021 09:40 by ADMIN
Release 2.24.0

Issue - Setting the selected element of a combo box inside a form worked in 2.22.0 and no longer works in 2.23.0 

Repo - https://github.com/benhysell/BlazorGridPagingIssue

Steps to Reproduce 

  • In the test repo start the application and navigate to https://localhost:5001/updateWeather
  • The selected value in the combo box should be the 8th value, "summary 8"
  • Stop the application, in BlazorGrid.Client.csproj 
    • Replace <PackageReference Include="Telerik.UI.for.Blazor" Version="2.22.0" />
    • With <PackageReference Include="Telerik.UI.for.Blazor" Version="2.23.0" />
  • Do a clean/rebuild to ensure the latest version of Telerik Blazor is being used
  • Run the application in a new incognito window and navigate back to https://localhost:5001/updateWeather, notice how nothing is selected in the combo box

 

Details

This is a contrived example pulled out of a larger application.  Almost all of our combo boxes are backed by OData calls.  When we 'create or POST' an element the first time we load the form we have the combo box make an OData call to retrieve the top 200 elements.  On a subsequent 'edit or PUT', where we have a thing we want to update we first go get the thing we want to work with, and then fill in the comobo box with that element.

In this example application we simulate this load by deciding if a value was passed in or not for the combo box.  https://localhost:5001/updateWeather always passes in an 8 to load the 8th element.  https://localhost:5001/createWeather does not pass in any value, leaving the form value unbound.

This all worked as expected in 2.22.0, however once we upgraded to 2.23.0 we could no longer set the value of the combo box on load when combined with an OData call.

Unplanned
Last Updated: 02 Dec 2021 12:23 by ADMIN

I have a ComboBox/DropDownList that gets data from a remote service, using virtualization. When the PageSize property is big enough (in my case 20), I have issues scrolling up the selection box dropdown list. I'm trying to scroll but then resets to the currently selected item making it almost impossible to scroll up. You can use your own demo examples to replicate this issue.

To reproduce the issue, try the ComboBox - Virtualization, in Telerik REPL (Demo), change the PageSize from 10 to 20. Open the dropdown and select an item. Then, open again the dropdown and scroll slowly up.

Duplicated
Last Updated: 11 Nov 2021 21:27 by ADMIN

 

Thanks for adding more new controls to Blazor. That help us to move to it from ASPX AJAX.

Can we have the Multi-Column ComboBox, like the ASPX AJAX that one, please?

https://www.telerik.com/products/aspnet-ajax/ajax-multicolumncombobox.aspx

 

Completed
Last Updated: 02 Sep 2021 12:52 by ben

Example Repo: https://github.com/benhysell/BlazorGridPagingIssue

Steps To Reproduce

  • Run application and navigate to https://localhost:5001/updateweather
  • Examine the ComboBoxes 'OData Weather Forecasts' and 'OData User' appears correct
  • Stop application, change package reference for Telerik.UI.for.Blazor from version 2.25.0 to version 2.26.0
  • Clean/Rebuild/run application and navigate back to https://localhost:5001/updateweather
  • ComboBox now appears 'doubled', there are two boarders around the ComboBox
Unplanned
Last Updated: 10 May 2021 07:28 by ADMIN

I am working on a form where experienced agents need to input data quickly. Often enough they know the codes and so they can type them in the combo box, but they shouldn't have to look for the mouse to select the item, the combo box should select it when the user presses Tab to move to the next field.

This should happen only when the user has filtered the combo box so they see some items (and so the dropdown is open) - I want them to be able to select only items from the available options, AllowCustom does not work for me.

---

ADMIN EDIT

Here is one workaround you can consider:

 

@inject IJSRuntime _js

@* Move this script to a proper place in your project, the suppress-error hack is to keep it here in the component for easy copy-paste *@
<script suppress-error="BL9992">
    function getComboHighligtedItem() {
        // gets the currently focused item in this particular combobox
        var selItemElem = document.querySelector(".special-combobox .k-item.k-state-focused");
        if (selItemElem) {
            return selItemElem.innerText;
        }
    }
</script>

Selected value: @selectedValue
<br />

<TelerikComboBox OnBlur="@Test" PopupClass="special-combobox"
                 
                 Data="@myComboData" TextField="MyTextField" ValueField="MyValueField" @bind-Value="@selectedValue" 
                    Placeholder="Select an item..." ClearButton="true" Filterable="true" FilterOperator="@StringFilterOperator.Contains">
</TelerikComboBox>

<input placeholder="other form elements" />

@code {
    async Task Test()
    {
        string currInput = await _js.InvokeAsync<string>("getComboHighligtedItem");
        Console.WriteLine("--------------");
        Console.WriteLine(currInput);
        Console.WriteLine("--------------");
        // note - this relies on the item template of the combo rendering the text, or not being used at all
        // if you use other item templates, you may need to delve deeper in the DOM or otherwise recognize the item
        if (!string.IsNullOrEmpty(currInput))
        {
            // match the filter operation to the filter operator of the combo box - Contains in this sample
            var matchingItem = myComboData.Where(itm => itm.MyTextField.ToLowerInvariant().Contains(currInput.ToLowerInvariant())).FirstOrDefault();
            if (matchingItem != null)
            {
                selectedValue = matchingItem.MyValueField;
            }
        }

    }
   
    // just dummy data follows

    IEnumerable<MyDdlModel> myComboData = Enumerable.Range(1, 20).Select(x => new MyDdlModel { MyTextField = "item " + x, MyValueField = x });

    int selectedValue { get; set; }

    public class MyDdlModel
    {
        public int MyValueField { get; set; }
        public string MyTextField { get; set; }
    }
}

 

---

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