Completed
Last Updated: 29 Apr 2025 11:23 by ADMIN
Release 2025 Q2 (May)
Created by: Miroslav
Comments: 0
Category: PDFViewer
Type: Bug Report
2

Trying to upload a large file from a mobile device breaks the component.
Step to reproduce:

  1. Open this REPL example on a mobile device
  2. Click the "Load Data" button.

The issue can be reproduced only in version 8.0.0

Completed
Last Updated: 24 Apr 2025 05:23 by ADMIN
Release 2025 Q2 (May)
Created by: Scott
Comments: 0
Category: PDFViewer
Type: Bug Report
2

Rebinding the PDF Viewer multiple times leads to an ever increasing memory usage, which can ultimately cause a browser crash.

The issue started with Telerik UI for Blazor version 8.0.0 and does not occur in 7.1.0.

Test Page: https://blazorrepl.telerik.com/QTayOxvQ090qYPsb50

 

Completed
Last Updated: 16 Apr 2025 10:52 by ADMIN
Release 2025 Q2 (May)
Created by: Evan
Comments: 1
Category: PDFViewer
Type: Bug Report
2

Related to PDF Viewer does not display editable Acro fields, which was fixed in version 8.0, but the problem with readonly Acro fields persisted.

This is a regression in version 7.0.0. Version 6.2.0 displays all the acro field values as expected.

Unplanned
Last Updated: 16 Apr 2025 10:19 by ADMIN
Created by: Nathan
Comments: 0
Category: PDFViewer
Type: Feature Request
4
I'm wondering if there is any plan to implement a URL as an option for loading in a PDF.  I want to be able to display PDFs that are hosted in a Sharepoint drive by URL without having to download a PDF into memory every time.  I know there are viewers that can do this, but I'm just wondering if I'm missing something with Telerik, or if I need to go with a different solution.
Unplanned
Last Updated: 10 Apr 2025 11:43 by ADMIN
Created by: Joel
Comments: 1
Category: PDFViewer
Type: Feature Request
1
When printing a PDF file with the PDF Viewer, there is an "about:blank" title at the top and bottom of the paper sheet. I would like to set a contextual value of my own, or remove this "about:blank" altogether.
Unplanned
Last Updated: 08 Apr 2025 21:03 by Dustin
Created by: Simon
Comments: 9
Category: PDFViewer
Type: Bug Report
9

Hallo,

i want to Render PDF Files with the PDF Viewer Component.

The Data of the PDF is already fetched from the API when the PDF-Viewer starts Rendering the Loading animation appears and freezes.

After a few Seconds the PDF will be Rendered.

The size of the PDF File is about 5MB.

=====

TELERIK EDIT: Here is a possible workaround - replace the built-in PDF Viewer LoaderContainer with another one with a different animation Type.

<div class="pdfviewer-wrapper">
    <TelerikPdfViewer Height="600px" />

    @* With a Loading... label *@
    <TelerikLoaderContainer Class="pdf-loader-container"
                            OverlayThemeColor="@ThemeConstants.Loader.ThemeColor.Light"
                            Size="@ThemeConstants.Loader.Size.Large"
                            Visible="true" />

    @* Without a Loading... label *@
    @*<TelerikLoaderContainer Class="pdf-loader-container"
                                OverlayThemeColor="@ThemeConstants.Loader.ThemeColor.Light"
                                Visible="true">
            <Template>
                <TelerikLoader Size="@ThemeConstants.Loader.Size.Large"
                               Type="@LoaderType.Pulsing" />
            </Template>
        </TelerikLoaderContainer>*@
</div>

<style>
    .pdfviewer-wrapper {
        position: relative;
    }

    .pdf-loader-container,
    .k-pdf-viewer .k-loader-container {
        visibility: hidden;
    }

    .k-pdf-viewer:has(.k-loader-container:not([style*="none"])) + .pdf-loader-container {
        visibility: visible;
    }
</style>

@code {
    private byte[]? PdfViewerData { get; set; }
}


Completed
Last Updated: 28 Mar 2025 11:26 by ADMIN
Release 2025 Q2 (May)
Created by: Miroslav
Comments: 1
Category: PDFViewer
Type: Feature Request
2

When a user invokes a Search tool, their intention is to directly write a text to search, therefore the edit for the search text should be focused immediately. In the current implementation, users have to manually focus the edit all the time, which is really inconvenient.

Unplanned
Last Updated: 19 Mar 2025 11:58 by Joel
Created by: Joel
Comments: 0
Category: PDFViewer
Type: Feature Request
2

I want to detect when a user has added or removed an annotation in the PDF Viewer.

Unplanned
Last Updated: 19 Mar 2025 11:28 by ADMIN

Please expose a parameter to show or hide the "Select files..." button inside the empty PDF Viewer.

Currently, a possible workaround is to use CSS. Additionally, you may configure the Toolbar to not include the "Open" tool.

<style>
    .no-open .k-blank-page {
        display: none;
    }

    /* Use these selectors if you want to separately target the upload or the dropzone */
    /* .no-open .k-external-dropzone,
    .no-open .k-upload{
        display: none;
    } */
</style>

<TelerikPdfViewer Data="@PdfSource"
                  OnOpen="@OnPdfOpen"
                  Height="600px"
                  Class="no-open">
    <PdfViewerToolBar>
        <PdfViewerToolBarDownloadTool />
        <PdfViewerToolBarPrintTool />

        <PdfViewerToolBarSpacer />

        <PdfViewerToolBarPagerTool />

        <PdfViewerToolBarSpacer />

        <PdfViewerToolBarZoomTool />
        <PdfViewerToolBarSelectionTool />
        <PdfViewerToolBarSearchTool />
        <PdfViewerToolBarAnnotationsTool />
    </PdfViewerToolBar>
</TelerikPdfViewer>

@code {
    private byte[] PdfSource { get; set; }

    private bool LoaderVisible { get; set; }

    private async Task OnPdfOpen(PdfViewerOpenEventArgs args)
    {
        // Cancel the event for additional precaution in case someone bypasses the CSS and forces the page to show the button and the dropzone.
        args.IsCancelled = true;
    }
}

Duplicated
Last Updated: 05 Mar 2025 08:34 by ADMIN
Created by: Mindaugas
Comments: 0
Category: PDFViewer
Type: Feature Request
11

We still have some problems with printed pdf quality after the updates in 6.0.0. When pdf is printed using Telerik PDF viewer it seems it gets processed/rasterized and loses quality.

 

Unplanned
Last Updated: 03 Mar 2025 18:39 by Gal
Created by: Gal
Comments: 0
Category: PDFViewer
Type: Bug Report
3
The quality of the PDFViewer document in the print preview popup has declined since version 6.2.0.
Completed
Last Updated: 25 Feb 2025 07:10 by ADMIN
Release 8.0.0
Created by: Evan
Comments: 4
Category: PDFViewer
Type: Bug Report
1

Acro field values don't show in the PDF VIewer, although they display in the print preview dialog.

This is a regression in version 7.0.0. Version 6.2.0 displays the acro field values as expected.

===

TELERIK edit: This public item originally concerned to all Acro fields. We fixed the problem for editable Acro fields, while the fix for readonly ones can be tracked at PDF Viewer does not display readonly Acro fields

Unplanned
Last Updated: 19 Feb 2025 11:59 by Werdna
Created by: Werdna
Comments: 0
Category: PDFViewer
Type: Feature Request
5
I need access to the file the user has open. Also, if the file is changed, like with annotations, I want to access those changes too.
Completed
Last Updated: 12 Feb 2025 16:04 by ADMIN
Release 8.0.0
Created by: Charles
Comments: 1
Category: PDFViewer
Type: Bug Report
23
In version 7.0.0 the Pdf Viewer document content is blurry.
Completed
Last Updated: 12 Feb 2025 16:03 by ADMIN
Release 8.0.0
Open a PDF file in the PDF Viewer. Tap the magnifier icon to initiate the search. Start typing, the component freezes. 
Unplanned
Last Updated: 11 Feb 2025 13:05 by Joel

The PDF Viewer fails to display the loaded document if StateHasChanged() is called when the Data parameter is set.

A possible workaround is to call await Task.Delay(...) after StateHasChanged()

Test Page (run this in a server app):

<h1>PDF Viewer Tests</h1>

<h2>Load Initially</h2>

<TelerikPdfViewer Data="@FileData1"
                  EnableLoaderContainer="true"
                  Height="30vh"
                  Zoom="0.75m">
</TelerikPdfViewer>

<h2>Load On Demand</h2>

<TelerikButton ThemeColor="@ThemeConstants.Button.ThemeColor.Primary"
               OnClick="@( async () => await LoadPdf(2) )">Load PDF</TelerikButton>

<TelerikPdfViewer Data="@FileData2"
                  EnableLoaderContainer="true"
                  Height="30vh"
                  Zoom="0.75m">
</TelerikPdfViewer>

@code {
    private byte[]? FileData1 { get; set; }
    private byte[]? FileData2 { get; set; }

    protected async override Task OnInitializedAsync()
    {
        await LoadPdf(1);
    }

    public async Task LoadPdf(int id)
    {
        await Task.Delay(1000);

        if (id == 2)
        {
            FileData2 = Convert.FromBase64String(PdfBase64);
        }
        else
        {
            FileData1 = Convert.FromBase64String(PdfBase64);
        }

        StateHasChanged();

        await Task.Delay(300);
    }

    private const string PdfBase64 = "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";
}

Unplanned
Last Updated: 23 Jan 2025 10:26 by HyunSoo
Created by: HyunSoo
Comments: 0
Category: PDFViewer
Type: Feature Request
2
I want to detect when a specific page is rendered, so I can extract information from that page. Please expose a render event similar to the one in jQuery.
Unplanned
Last Updated: 15 Dec 2024 19:29 by Marc
Created by: Nicolas
Comments: 4
Category: PDFViewer
Type: Feature Request
32
I would like to be able to control the default zoom level in the PDF viewer. For example, I would like to be able to set it as "Fit to Page". 
Unplanned
Last Updated: 15 Dec 2024 19:20 by Marc
Created by: Marc
Comments: 3
Category: PDFViewer
Type: Feature Request
4
I want to be able to pinch the document in the PDFViewer and zoom it. Similar to how PDF is fluently zoomed in and out on pinch if opened in a web browser.
Unplanned
Last Updated: 09 Dec 2024 14:59 by Mark
Created by: Mark
Comments: 0
Category: PDFViewer
Type: Feature Request
10
When displaying a PDF using the PDFViewer component, I have noticed that, if the PDF being displayed has any website links/hyperlinks in it, the links cannot be clicked. If I download the PDF from the component and open the file, I am able to click the links. Can you add this functionality?
1 2 3