Questions on UI for Blazor Forum

1 answer

17 views

Select the only remaining option in a Filterable Combobox.

I have a TelerikComboBox where the Data is a list of objects with Text and Value parameters, AllowCustom="false," and Filterable="true." The user can start typing in their desired selection to narrow down the list of options in the dropdown. After a while, they will narrow the dropdown options to a single value. If they press enter, click on the item in the dropdown, press down, or finish typing the entire Text associated with that selection's Value, the selection will be made. However, if they tab to or click on the next component, the selection will NOT be made. My request is for a way to automatically select the only remaining item in the filtered dropdown list when the component loses focus.

ComboBox

answered on 10 Jun 2024

1 answer

45 views

Trouble with Event Propagation in Blazor using Telerikeditor in a Telerikgrid with Incell editing

Hello everyone,

I am experiencing an issue with my Blazor application and am seeking advice or solutions from anyone who might have had the same issue.

When interacting with the Telerik Editor within a Telerik Grid, clicking inside the editor unexpectedly exits the edit mode. This seems to be linked to event propagation issues, where clicking the editor triggers a propagation that causes the grid to exit edit mode.

Error Messages:

When my issue triggers, I also see the following error in the console:

Uncaught TypeError: Cannot read properties of null (reading 'state')
This occurs within the telerik-blazor.js script and seems related to handling state changes or events.

I already looked trough Troubleshooting but removing all "StateHasChanged" didn't solve the issue.

What I've Tried:

Implemented JavaScript to stop event propagation using event.stopPropagation() within various event handlers (click, mousedown, etc.).
Checked that the event handlers are correctly assigned and that the JavaScript is initialized at the correct life cycle phase in Blazor (OnAfterRenderAsync).
Removed any redundant StateHasChanged() calls as per Telerik's recommendations to prevent unnecessary re-rendering and potential race conditions.

Code:

The Telerikgrid with the Telerikeditor:

<TelerikGrid Data="ProzessSubPosListe"
             EditMode="@GridEditMode.Incell"
             OnUpdate="@UpdateHandlerProzessPos"
             OnDelete="@DeleteHanlderProzessPos"
             Size="@ThemeConstants.Grid.Size.Small"
             PageSize="100"
             Sortable="true"
             Pageable="false"
             Resizable="true"
             >
    <GridColumns>
        <GridColumn Field="@nameof(ProzessPosClass.Nr)" Title="Nr" Width="10%"></GridColumn>
        <GridColumn Field="@nameof(ProzessPosClass.Title)" Title="Thema" Width="20%"></GridColumn>
        <GridColumn Field="@nameof(ProzessPosClass.ProzessContent)" Title="Beschreibung" Width="20%">
            <EditorTemplate Context="dataItem">
                <div @onclick:stopPropagation="true" @onclick:preventDefault="true">
                @{
                    var item = dataItem as ProzessPosClass;
                    <TelerikEditor @bind-Value="@item.ProzessContent" Width="650px" Height="400px" ></TelerikEditor>
                }
                </div>
            </EditorTemplate>
        </GridColumn>
        <GridCommandColumn Context="Journal" Width="100px">
            <GridCommandButton Command="Save" Icon="@("save")" ShowInEdit="true"></GridCommandButton>
            <GridCommandButton Command="Delete" Icon="@("trash")"></GridCommandButton>
            <GridCommandButton Command="Cancel" Icon="@("cancel")" ShowInEdit="true"></GridCommandButton>
        </GridCommandColumn>
    </GridColumns>
    <NoDataTemplate>
        <strong>Kein Prozessschritt vorhanden</strong>
    </NoDataTemplate>
</TelerikGrid>

OnAfterRenderAsync Method to call the Javascript function.

protected override async Task OnAfterRenderAsync(bool firstRender)
{
    if (firstRender)
    {
        await JSRuntime.InvokeVoidAsync("setupEditorEventHandling");
    }
}

My Javascript inside of _Layout.cshtml trying to resolve the issue:

 <script>
     function setupEditorEventHandling() {
         console.log("Setup editor event handling");
         document.addEventListener('click', function (event) {
             try {
                 var editor = event.target.closest('.k-editor.telerik-blazor');
                 if (editor) {
                     event.stopPropagation();
                 }
             } catch (error) {
                 console.error('Error handling editor click:', error);
             }
         }, true);
     }
 </script>

How the issue looks like:

Has anyone encountered similar issues with event handling in Blazor applications using that setup?

Any insights or suggestions would be greatly appreciated.

Editor

Grid

answered on 10 Jun 2024

1 answer

22 views

ComboBox with AllowCustom is losing keystrokes randomly at normal typing speed

This ComboBox, with filtering and custom values enabled, glitches when typing in the box. At a normal typing speed, I'm seeing that about 10% of keystrokes are skipped, or appear briefly and then disappear.

<TelerikComboBox Data="@_data"
                 @bind-Value="@_value"
                 AllowCustom="true"
                 Filterable="true"
                 FilterOperator="@StringFilterOperator.Contains"
                 Enabled="@Enabled"></TelerikComboBox>
...
List<string> _data = new() { "Lorem", "ipsum", "dolor", "sit", "amet", "consectetur", "adipiscing", "elit" };
string _value { get; set; }

Dropped letters are slightly less frequent with DebounceDelay="0" ; it's worse with more items in the list. It seems to occur if you type more than 3-4 letters per second.

Also, clicking the cursor in the middle of the text and typing can cause the cursor to jump to the end of the input and jumble your letters around.

ComboBox

MultiColumnComboBox

updated question on 07 Jun 2024

0 answers

13 views

How do I clear the PDFViewer?

Right now it is previewing a PDF, and neither rebinding, matching its data with array[0] or null, nor even matching the component reference with a new one works.

PDFViewer

updated question on 07 Jun 2024

1 answer

14 views

Change scheduler event cell size

How can I change the height of the scheduler event? All I could find for changing event template was ItemTemplate but that doesn't help to change the height of the cell. Is there a way to achieve that?

Scheduler

answered on 06 Jun 2024

1 answer

15 views

Problems with the Telerik version

Hi, recently i got the licese, ive been working with the "Trial version", but when i activate the licese my proyect warns me that some componetn called "InitCart" is no initialized

General Discussions

Grid

answered on 06 Jun 2024

0 answers

15 views

TelerikGrid drag and drop between grids does not fire OnRowDrop for destination grid

I'm trying to use TelerikGrid to drag and drop items from subgrid to subgrid (Using another TelerikGrid in the DetailTemplate). I have gotten it to work well when moving rows around the same grid, but it doesn't work when I try to drag from one grid to another. The event only fires for the source grid and not the destination grid, whereas the documentation says it should fire for both.

I'm not sure whether I'm doing something wrong or if this function just doesn't work if the two grids don't have the same parent component.

Here's a sample of my code:

                <TelerikGrid Data=@_items
                             Height=@GetHeightValue()
                             Width=@GetWidthValue()
                             FilterMode="@GridFilterMode.FilterMenu"
                             Pageable=@Pageable
                             PageSize=@(PageSize ?? DefaultPageSize)
                             OnRowClick="@OnRowClick"
                             DetailTemplate="@GetGridDetailContent()"
                             RowDraggable=@RowDraggable
                             OnRowDrop="@((GridRowDropEventArgs<DataType> args) => OnRowDropHandler(args))"
                             @ref=@_grid>
                    <GridSettings>
                        <GridRowDraggableSettings DragClueField="@nameof(DataType.Name)">
                        </GridRowDraggableSettings>
                    </GridSettings>

In this case GetGridDetailContent() returns another component of the same type to be able to display three levels of hierarchical data. Am I missing anything, or does this just not work unless, like in the examples, both grids are part of the same component?

Grid

asked on 05 Jun 2024

1 answer

11 views

Blazor TelerikGrid formatted numbers (e.g. 1,234,567.89) not able to paste.

I have a grid with bound columns of numeric fields, when we go to edit mode and try to paste the any formatted numbers (e.g. 1,234,567.89), its not getting pasted.

urgent solution is required to accomplish this task.

Grid

answered on 05 Jun 2024

2 answers

19 views

Tooltip showing with null or empty

Hi we have been trying to utilise the TelerikTooltip dynamically for a number of different reasons across various controls and buttons. We notice part of the tooltip icon will still display if the controls tooltip property is either null or empty (see the code snippit from the REPL below.

Is there an existing way with the TelerikTooltip (without too much hacking) that it will NOT show the tooltip if the target title is null or empty or whitespace?

With this snippit you may also notice an issue with trying to use dynamic tooltips in that the tooltip on the button does not update when pressed. Similar to the question found here: https://feedback.telerik.com/blazor/1460642-the-tooltip-should-be-able-to-re-evaluate-targets-tooltip-not-working-for-elements-not-present-at-first-rendering

@if (RepaintTooltipFlag)
{
    <TelerikTooltip TargetSelector=".tooltip-target">
    </TelerikTooltip>
}
<TelerikButton class="tooltip-target" title="@buttonTooltip" OnClick="@AddMoreContent">show more content</TelerikButton>
@code{
    string buttonTooltip {get;set;} = "";
    bool AllContentVisible { get; set; }
    //part of workaround
    bool RepaintTooltipFlag { get; set; } = true;
    async Task AddMoreContent()
    {
        AllContentVisible = true;
        buttonTooltip = "More Content Tip";
        //workaround
        RepaintTooltipFlag = false;
        await Task.Delay(30);
        RepaintTooltipFlag = true;
    }
}