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Check image size in JavaScript RichTextEditor control

06 Jun 2023 / 1 minute to read

By using the Rich text editor’s imageUploading event, you can get the image size before uploading and restrict the image to upload, when the given image size is greater than the allowed size.

In the following, we have validated the image size before uploading and determined whether the image has been uploaded or not.

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index.ts
index.html
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import { RichTextEditor, Toolbar, Image,  Link, HtmlEditor, QuickToolbar, NodeSelection } from '@syncfusion/ej2-richtexteditor';
import { UploadingEventArgs } from '@syncfusion/ej2-inputs';
RichTextEditor.Inject(Toolbar, Image,  Link, HtmlEditor, QuickToolbar );

let defaultRTE: RichTextEditor = new RichTextEditor({
        height: 400,
        toolbarSettings: {
        items: ['Undo', 'Redo', '|',
                'Bold', 'Italic', 'Underline', 'StrikeThrough', '|',
                'FontName', 'FontSize', 'FontColor', 'BackgroundColor', '|',
                'SubScript', 'SuperScript', '|',
                'LowerCase', 'UpperCase', '|',
                'Formats', 'Alignments', '|', 'OrderedList', 'UnorderedList', '|',
                'Indent', 'Outdent', '|', 'Image', '|', 'SourceCode',
                '|', 'ClearFormat', 'Print']
        },
         insertImageSettings: {
            saveUrl: "https://aspnetmvc.syncfusion.com/services/api/uploadbox/Save",
            path: "../Images/"
        },
        imageUploading: onImageUploading
    });
    defaultRTE.appendTo("#defaultRTE");

    function onImageUploading(args: UploadingEventArgs): void {
    console.log("file is uploading");
    let imgSize = 500000;
    let sizeInBytes: number = args.fileData.size;
    if ( imgSize < sizeInBytes ) {
        args.cancel = true;
    }
    }
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<!DOCTYPE html>
<html lang="en">

<head>
            
    <title>Essential JS 2 Rich Text Editor</title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Typescript UI Controls" />
    <meta name="author" content="Syncfusion" />
    <link href="index.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/21.2.3/ej2-base/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/21.2.3/ej2-richtexteditor/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/21.2.3/ej2-inputs/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/21.2.3/ej2-lists/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/21.2.3/ej2-navigations/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/21.2.3/ej2-popups/styles/material.css" rel="stylesheet" />
     <link href="//cdn.syncfusion.com/ej2/21.2.3/ej2-buttons/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/21.2.3/ej2-splitbuttons/styles/material.css" rel="stylesheet" />
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css">
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="systemjs.config.js"></script>

</head>

<body>
    <div id='loader'>Loading....</div>
    <div id='container'>
        <script src="https://cdn.jsdelivr.net/npm/marked/marked.min.js"></script>
        <div id='defaultRTE'>

        </div>

    </div>
</body>

</html>
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