Currently, the parameters' editors of the WRD's internal viewer cannot be changed. A report parameter with available values is always rendered with the ListView widget.

I would like to be able to use the viewer's built-in ComboBox widget as shown in the HTML5 Report Viewer Options Overview - Telerik Reporting article, and to also be able to use a custom one.

Standalone Report Designer crashes on start when opening TRDP reports from Visual Studio. See the images below:

The stack trace came about after trying to open multiple files through VS and popped up after about report number 3 or 4. Lastly, for us "sometimes" the reports open, sometimes they don't. If it does open the report going through VS, then the Standalone Report Designer will randomly shut down/crash with no errors (after 5 to 30 minutes of active use. We haven't found a pattern for what makes the Designer crash.

So far, the Designer doesn't crash if started from the Windows Explorer.

A lot of errors or warnings from Web Report Designer or Viewer are in English, please provide options to translate them.
Tour on start Web Report Designer cannot be translated as well.

https://docs.telerik.com/reporting/designing-reports/report-designer-tools/web-report-designer/localizing-the-web-report-designer

When HtmlTextBox is empty and i click some expression is added like this " = Len("bla")", but when something is already put is added like this "{Len("bla")}

Problem with version " =" is it does not work with neither text.

This is my scenerio, I pick some function for example Len(), and then i want to add some info, and i've got

= Len("numbers") numbers

and there is error in viewer


but when i put first "numbers" and click expresion len
expression is added with {} and it works ok in viewer

this behavior is annoying, in htmltextbox expressions should always be added with {}

If I do not have any report opened in the Web Report Designer, and then open the Asset Manager, I am not able to close the Asset Manager afterward.

Instead, when I click on the 'X' button to close the Asset Manager screen, I get the following error:

Uncaught TypeError: this.designSurfaceManager.ActiveDesignSurface is null
    updatePreviewButtonState http://localhost:51864/api/reportdesigner/designerresources/js/webReportDesigner-17.1.23.718.min.js/:9
    restoreMainMenu http://localhost:51864/api/reportdesigner/designerresources/js/webReportDesigner-17.1.23.718.min.js/:9
    createAssetManagerOverlay http://localhost:51864/api/reportdesigner/designerresources/js/webReportDesigner-17.1.23.718.min.js/:9

The 'Workspace Preferences' view also cannot be loaded in this scenario(no report).

When the Report has a Picture Watermark or BackgroundOveray with Opacity 1, in the preview of the viewer, in PDF and PPTX the watermark is displayed behind the text. In DOCX though, the watermark covers the text.

In some scenarios, it is necessary to execute a special code when the user cancels report rendering in Report Viewers.
A special event raised when the report rendering is canceled will be very useful for these scenarios.

I have cascading parameters, and in some cases, the data set for the dependent parameters is empty. In these cases, the parameter editor of the second parameter is displayed as an input/textbox rather than a dropbox without data.
In the Standalone Designer, the parameter editor is displayed as expected, with a dropdown without data.

The report for reproducing the issue is Product Line Sales-01.zip

When I am sending an email through the native Blazor Report Viewer and I type in the CC field, even if I delete what I have typed there, an "Email format is not valid" error will be displayed below the input and I will be unable to send the email.

This does not occur if I do not type in the CC input at all and it also works if I provide a valid email there.

Currently, the Map's TileProvider UrlTemplate property may be set only to a hard-coded string. It would be very useful to be configurable as an Expression to allow for dynamic values.

If cells grow or shrink, if there are hidden cells, any time a report section grows vertically, the next section/table is not respecting the growing of the previous item and text prints in the wrong spot or the table overlaps the previous table.

A potential workaround is to manually convert the troublesome tables to lists where possible.

As documented slightly comically here: https://www.telerik.com/forums/can-not-for-the-life-of-me-get-a-report-to-run  , and confirmed by other users on that thread, Telerik reporting can be incredibly unintuitive in the configuration steps.

Having just been through the wringer yet again - I just wanted to copy the configuration from one working project to another, and it's taken me about 6 hours of tearing my hair out to get it working, I'm giving some suggestions for improving this. These really are bugs, not features, hence the bug report.

My use case is the HTML5 report viewer running off the REST service in dotNet 6.

(1) Try systematically breaking one component at a time of the configuration, and check that the error message is correct.

eg. in builder.Services.AddControllersWithViews().AddNewtonsoftJson();

if .AddNewtonsoftJson() is left out, we get the error:

Cannot access the Reporting REST service. (serviceUrl = '/api/TelerikReportHandler/'). Make sure the service address is correct and enable CORS if needed. (https://enable-cors.org)

It is almost impossible to diagnose this - there is no reason that error could not indicate that NewtonsoftJson is not available. I working it out by going through the white paper, and thought 'that's in there but it's surely not going to fix that error message' but I added it anyway and hey presto, fixed.

Another example, not having the .css file referenced correctly in the HTML file referencing the viewer template, displayed a message telling me that the report viewer did not match the REST service version number, a completely incorrect error. Again, I realised the error, thought 'there is no way this is going to fix it', and it did. That's how misleading the errors are.

(2) Don't cache everything

Once I finally got it all working, I decided to break things deliberately to get the error messages so I could record them for my information next time I have to go around this loop. However, I then found that nothing on the client side could be broken. That .css file that was missing a minute ago and causing the error, now I could delete it completely and the reports ran just fine. I could delete the entire template folder and same behaviour, even after closing and restarting the project.

So clearly, once it's working your code is caching the files and/or config internally somewhere. That's a really, really astoundingly bad idea.

The reason I had all these problems in the first place was that I copied all the configuration code and files from a working project, and then the project I copied it to didn't work. I triple checked everything. No go.

I now realise that the working project had probably cached all the files it needed, but then I must have updated the project with non working files, but the project ignored all that and continued to work with its cached files. When I copied the files to a new project, only then did the problem become evident. This is incredibly unintuitive, frustrating and undocumented.

Telerik is not a bad product, but I have never failed to take less than half a day every time I have needed to change anything. If I thought the competitiors were any better, I'd jump ship but frankly I think they're all probably the same.

But if you took this advice, the process would become way, way easier to work through. All we need is good, clear, specific error messages and, for the love of god, *no* caching.

In a cascading dropdown, we noticed that the child dropdown is not populated until the parent dropdown is closed after selection. There is a second delay between selecting the parent dropdown and populating the child dropdown. Between this small interval of time, the preview button can be clicked, as it is not disabled, due to which wrong values (previously selected values) are passed in the parameters resulting in incorrect results.

I'm changing the font color to Transparent based on a condition in my report.
This works in the Standalone Designers for .NET and for .NET Framework.
In the WPF Report Viewers for .NET and .NET Framework though the Transparent color is not respected. Other Font colors like green are properly shown conditionally in the WPF viewers.

Running the Native Blazor Viewer page VS item template in a project that has authentication and authorization configured, breaks the application.

If the application contains an authorize attribute in its _Imports.razor file, the Reporting-related usings are placed in the middle of it.

@attribute [Authorize@using Telerik.Blazor
@using Telerik.Blazor.Components
@using Telerik.ReportViewer.BlazorNative
]

Additionally, the declaration that introduces the EndpointMiddleware in the Program.cs file of the application is added directly after the UseRouting declaration. This breaks applications that already have the UseAuthentication and UseAuthorization declarations because the UseAuthorization call needs to appear between the UseRouting and UseEndpoints calls.

app.UseRouting();
app.UseEndpoints(endpoints =>
{
	endpoints.MapControllers();
	// ... 
});

app.UseAuthentication();
app.UseAuthorization();

Currently, the desktop viewers don't allow adding custom headers to their requests to the service.
In HTML5-based web viewers, this is possible through the AjaxPrefilter event.

The following warning is shown in the browser console when starting my Blazor application when I use the native Blazor Report Viewer:

WARNING: Processing source-maps of https://localhost:7025/_content/Telerik.ReportViewer.BlazorNative/js/reporting-blazor-viewer.js took longer than 11000 ms so we continued execution without waiting for all the breakpoints for the script to be set.Could not read source map for https://localhost:7025/_content/Telerik.ReportViewer.BlazorNative/js/reporting-blazor-viewer.js: Unexpected 404 response from https://localhost:7025/_content/Telerik.ReportViewer.BlazorNative/js/reporting-blazor-viewer.js.map: 

In PDF rendering, my SVG image does not get clipped according to the design-time look of the report while in Excel(XLSX), the same SVG content appears almost correctly.