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Print Editor Content

Environment

Product Editor for Blazor

Description

How to print the contents of the Blazor Editor? The user should print only the Editor value, without the page content around the component.

Solution

Programmatic printing relies on the JavaScript print() method of the window object.

The example below shows three possible techniques:

  1. If the Editor's EditMode is Iframe, then call the print() method of the iframe window object.
  2. If EditMode is Div, there are two options:
    • Call the print() method of the current page's window object. Use CSS @media query to implement print-only styles and hide everything outside the Editor's content area.
    • Open a new browser window with JavaScript. Inject the Editor value as content of the new window. Call the print() method of the new window object. Note that browser popups may be disabled by the user.

Print the Editor Content

@using Telerik.Blazor.Components.Editor

@inject IJSRuntime js

<div class="noprint">
    <p>Iframe EditMode:</p>

    <TelerikEditor EditMode="@EditorEditMode.Iframe"
                   Class="editor-iframe"
                   Tools="@EditorTools"
                   @bind-Value="@EditorValue">
        <EditorCustomTools>
            <EditorCustomTool Name="Print">
                <TelerikButton OnClick="@PrintIframe" Icon="print">Print iframe</TelerikButton>
            </EditorCustomTool>
        </EditorCustomTools>
    </TelerikEditor>

    <p>Div EditMode:</p>
</div>

<TelerikEditor EditMode="@EditorEditMode.Div"
               Class="editor-div"
               Tools="@EditorTools"
               @bind-Value="@EditorValue">
    <EditorCustomTools>
        <EditorCustomTool Name="Print">
            <TelerikButton OnClick="@PrintDiv" Icon="print">Print via CSS media</TelerikButton>
            <TelerikButton OnClick="@PrintWindow" Icon="print">Print via popup window</TelerikButton>
        </EditorCustomTool>
    </EditorCustomTools>
</TelerikEditor>

@* suppress-error allows <script> tags inside Razor components as a workaround. *@
@* Move this script to an external file in production environment. *@
<script suppress-error="BL9992">
    function printIframe() {
        var editorIframe = document.querySelector(".editor-iframe iframe");
        if (editorIframe) {
            editorIframe.contentWindow.print();
        }
    }

    function printDiv() {
        var editorDiv = document.querySelector(".editor-div .k-content");
        if (editorDiv) {
            window.print();
        }
    }

    function printExtraWindow(editorValue) {
        var printWin = window.open('', '', 'left=0,top=0,width=800,height=500,toolbar=0,scrollbars=0,status=0');
        printWin.document.write(editorValue);
        printWin.document.close();
        printWin.focus();
        printWin.print();
        printWin.close();
    }
</script>

<style>
    @@media print {
        /* hide the Editor toolbar and everything outside the component */
        .noprint,
        .k-editor .k-toolbar {
            display: none;
        }

        /* expand Editor and disable scrollability */
        .k-editor-content {
            height: auto;
            overflow: visible;
        }
    }
</style>

@code {
    string EditorValue { get; set; } = "<p>foo <strong>bar</strong> baz</p>";
    List<IEditorTool> EditorTools { get; set; } = new List<IEditorTool>() { new CustomTool("Print") };

    async Task PrintIframe()
    {
        await js.InvokeVoidAsync("printIframe");
    }

    async Task PrintDiv()
    {
        await js.InvokeVoidAsync("printDiv");
    }

    async Task PrintWindow()
    {
        await js.InvokeVoidAsync("printExtraWindow", EditorValue);
    }
}
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