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Images in JavaScript DocumentEditor control

30 Jul 2021 / 2 minutes to read

Document editor supports common raster format images like PNG, BMP, JPEG, and GIF. You can insert an image file or online image in the document using the insertImage() method. Refer to the following sample code.

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index.ts
index.html
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import { DocumentEditor, Editor, Selection, ImageResizer, EditorHistory } from '@syncfusion/ej2-documenteditor';
import { Button } from '@syncfusion/ej2-buttons';
DocumentEditor.Inject(Editor, Selection, ImageResizer, EditorHistory);
let documenteditor: DocumentEditor = new DocumentEditor({
    isReadOnly: false,
    enableEditor: true,
    enableSection: true,
    enableImageResizer: true,
    enableEditorHistory: true
});
documenteditor.appendTo('#DocumentEditor');
let insertPictureButton: Button = new Button();
insertPictureButton.appendTo('#insert-picture');
document.getElementById('insert-picture').addEventListener('click', () => {
    let pictureUpload: HTMLInputElement = document.getElementById("insertImageButton") as HTMLInputElement;
    pictureUpload.value = '';
    pictureUpload.click();
});
document.getElementById('insertImageButton').addEventListener('change', onInsertImage);
function onInsertImage(args: any): void {
    if (navigator.userAgent.match('Chrome') || navigator.userAgent.match('Firefox') || navigator.userAgent.match('Edge') || navigator.userAgent.match('MSIE') || navigator.userAgent.match('.NET')) {
        if (args.target.files[0]) {
            let path = args.target.files[0];
            let reader = new FileReader();
            reader.onload = function (frEvent: any) {
                let base64String = frEvent.target.result;
                let image = document.createElement('img');
                image.addEventListener('load', function () {
                    documenteditor.editor.insertImage(base64String, this.width, this.height);
                })
                image.src = base64String;
            };
            reader.readAsDataURL(path);
        }
        //Safari does not Support FileReader Class
    } else {
        let image = document.createElement('img');
        image.addEventListener('load', function () {
            documenteditor.editor.insertImage(args.target.value);
        })
        image.src = args.target.value;
    }
}
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<!DOCTYPE html>
<html lang="en">

<head>
    <title>EJ2 Animation</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-documenteditor/styles/fabric.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-buttons/styles/fabric.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-base/styles/fabric.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-dropdowns/styles/fabric.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-inputs/styles/fabric.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-lists/styles/fabric.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-navigations/styles/fabric.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-popups/styles/fabric.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-splitbuttons/styles/fabric.css" rel="stylesheet" />
    <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'>
        <input type="file" id="insertImageButton" style="position:fixed; left:-110em" accept=".jpg,.jpeg,.png,.bmp" />
        <div id='toolbar'>
            <button id="insert-picture">Image</button>
        </div>
        <div style="width:100%;height: 100%">
            <!--Element which will render as DocumentEditor -->
            <div id="DocumentEditor"></div>
        </div>
    </div>
</body>


</html>

Image files will be internally converted to base64 string. Whereas, online images are preserved as URL.

Image resizing

Document editor provides built-in image resizer that can be injected into your application based on the requirements. This allows you to resize the image by dragging the resizing points using mouse or touch interactions. This resizer appears as follows.

Image

Changing size

Document editor expose API to get or set the size of the selected image. Refer to the following sample code.

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documenteditor.selection.imageFormat.width = 800;
documenteditor.selection.imageFormat.height = 800;

Note: Images are stored and processed(read/write) as base64 string in DocumentEditor. The online image URL is preserved as a URL in DocumentEditor upon saving.

Text wrapping style

Text wrapping refers to how images fit with surrounding text in a document. Please refer to this page for more information about text wrapping styles available in Word documents.

Positioning the image

DocumentEditor preserves the position properties of the image and displays the image based on position properties. It does not support modifying the position properties. Whereas the image will be automatically moved along with text edited if it is positioned relative to the line or paragraph.

See Also