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Check image size in JavaScript (ES5) RichTextEditor control

20 Apr 2021 / 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.js
index.html
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var defaultRTE = new rich_text_editor_1.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) {
        console.log("file is uploading");
        var sizeInBytes = args.fileData.size;
        var imgSize = 500000;
        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/ej2-base/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/ej2-richtexteditor/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/ej2-inputs/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/ej2-lists/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/ej2-navigations/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/ej2-popups/styles/material.css" rel="stylesheet">
     <link href="//cdn.syncfusion.com/ej2/ej2-buttons/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/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://cdn.syncfusion.com/ej2/dist/ej2.min.js" type="text/javascript"></script>
</head>

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

        </div>

    </div>


<script>
var ele = document.getElementById('container');
if(ele) {
    ele.style.visibility = "visible";
 }   
        </script>
<script src="index.js" type="text/javascript"></script>
</body></html>