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React Html Editor - Toolbar Customization

This demo shows how to add a custom control to the toolbar. The Show markup button opens a popup that displays the HTML Editor's output markup.

Backend API
import React, { useCallback, useState, useMemo } from 'react'; import HtmlEditor, { Toolbar, Item, type HtmlEditorTypes } from 'devextreme-react/html-editor'; import Popup from 'devextreme-react/popup'; import { markup } from './data.ts'; const headerValues = [false, 1, 2, 3, 4, 5]; const headerOptions = { inputAttr: { 'aria-label': 'Header' } }; export default function App() { const [value, setValue] = useState(markup); const [popupVisible, setPopupVisible] = useState(false); const customButtonClick = useCallback(() => { setPopupVisible(true); }, [setPopupVisible]); const getToolbarButtonOptions = useMemo(() => ({ text: 'Show markup', stylingMode: 'text', onClick: customButtonClick, }), [customButtonClick]); const valueChanged = useCallback((e: HtmlEditorTypes.ValueChangedEvent) => { setValue(e.value); }, [setValue]); const popupHiding = useCallback(() => { setPopupVisible(false); }, [setPopupVisible]); return ( <div className="widget-container"> <HtmlEditor value={value} onValueChanged={valueChanged}> <Toolbar> <Item name="undo" /> <Item name="redo" /> <Item name="separator" /> <Item name="header" acceptedValues={headerValues} options={headerOptions} /> <Item name="separator" /> <Item name="bold" /> <Item name="italic" /> <Item name="strike" /> <Item name="underline" /> <Item name="separator" /> <Item name="alignLeft" /> <Item name="alignCenter" /> <Item name="alignRight" /> <Item name="alignJustify" /> <Item name="separator" /> <Item widget="dxButton" options={getToolbarButtonOptions} /> </Toolbar> </HtmlEditor> <Popup showTitle={true} title="Markup" visible={popupVisible} onHiding={popupHiding} showCloseButton={true}> <div>{value}</div> </Popup> </div> ); }
import React, { useCallback, useState, useMemo } from 'react'; import HtmlEditor, { Toolbar, Item } from 'devextreme-react/html-editor'; import Popup from 'devextreme-react/popup'; import { markup } from './data.js'; const headerValues = [false, 1, 2, 3, 4, 5]; const headerOptions = { inputAttr: { 'aria-label': 'Header' } }; export default function App() { const [value, setValue] = useState(markup); const [popupVisible, setPopupVisible] = useState(false); const customButtonClick = useCallback(() => { setPopupVisible(true); }, [setPopupVisible]); const getToolbarButtonOptions = useMemo( () => ({ text: 'Show markup', stylingMode: 'text', onClick: customButtonClick, }), [customButtonClick], ); const valueChanged = useCallback( (e) => { setValue(e.value); }, [setValue], ); const popupHiding = useCallback(() => { setPopupVisible(false); }, [setPopupVisible]); return ( <div className="widget-container"> <HtmlEditor value={value} onValueChanged={valueChanged} > <Toolbar> <Item name="undo" /> <Item name="redo" /> <Item name="separator" /> <Item name="header" acceptedValues={headerValues} options={headerOptions} /> <Item name="separator" /> <Item name="bold" /> <Item name="italic" /> <Item name="strike" /> <Item name="underline" /> <Item name="separator" /> <Item name="alignLeft" /> <Item name="alignCenter" /> <Item name="alignRight" /> <Item name="alignJustify" /> <Item name="separator" /> <Item widget="dxButton" options={getToolbarButtonOptions} /> </Toolbar> </HtmlEditor> <Popup showTitle={true} title="Markup" visible={popupVisible} onHiding={popupHiding} showCloseButton={true} > <div>{value}</div> </Popup> </div> ); }
import React from 'react'; import ReactDOM from 'react-dom'; import App from './App.tsx'; ReactDOM.render( <App />, document.getElementById('app'), );
export const markup = ` <h2> <img src="../../../../images/widgets/HtmlEditor.svg" alt="HtmlEditor"> Formatted Text Editor (HTML Editor) </h2> <br> <p>DevExtreme JavaScript HTML Editor is a client-side WYSIWYG text editor that allows its users to format textual and visual content and store it as HTML.</p> <p>Supported features:</p> <ul> <li>Inline formats: <ul> <li><strong>Bold</strong>, <em>italic</em>, <s>strikethrough</s> text formatting</li> <li>Font, size, color changes (HTML only)</li> </ul> </li> <li>Block formats: <ul> <li>Headers</li> <li>Text alignment</li> <li>Lists (ordered and unordered)</li> <li>Code blocks</li> <li>Quotes</li> </ul> </li> <li>Custom formats</li> <li>Mail-merge placeholders (for example, %username%)</li> <li>Adaptive toolbar for working images, links, and color formats</li> <li>Image upload: drag-and-drop images onto the form, select files from the file system, or specify a URL.</li> <li>Copy-paste rich content (unsupported formats are removed)</li> <li>Tables support</li> </ul> `;
import React from 'react'; import ReactDOM from 'react-dom'; import App from './App.js'; ReactDOM.render(<App />, document.getElementById('app'));
export const markup = ` <h2> <img src="../../../../images/widgets/HtmlEditor.svg" alt="HtmlEditor"> Formatted Text Editor (HTML Editor) </h2> <br> <p>DevExtreme JavaScript HTML Editor is a client-side WYSIWYG text editor that allows its users to format textual and visual content and store it as HTML.</p> <p>Supported features:</p> <ul> <li>Inline formats: <ul> <li><strong>Bold</strong>, <em>italic</em>, <s>strikethrough</s> text formatting</li> <li>Font, size, color changes (HTML only)</li> </ul> </li> <li>Block formats: <ul> <li>Headers</li> <li>Text alignment</li> <li>Lists (ordered and unordered)</li> <li>Code blocks</li> <li>Quotes</li> </ul> </li> <li>Custom formats</li> <li>Mail-merge placeholders (for example, %username%)</li> <li>Adaptive toolbar for working images, links, and color formats</li> <li>Image upload: drag-and-drop images onto the form, select files from the file system, or specify a URL.</li> <li>Copy-paste rich content (unsupported formats are removed)</li> <li>Tables support</li> </ul> `;
<!DOCTYPE html> <html lang="en"> <head> <title>DevExtreme Demo</title> <meta http-equiv="X-UA-Compatible" content="IE=edge" /> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=5.0" /> <link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/26.1.5/css/dx.light.css" /> <link rel="stylesheet" type="text/css" href="./bundle.css" /> </head> <body class="dx-viewport"> <div class="demo-container"> <div id="app"></div> </div> <script src="bundles/vendor/react.vendor.js"></script> <script src="./bundle.js"></script> </body> </html>
.dx-htmleditor-content img { vertical-align: middle; padding-right: 10px; }