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React Native Rich Text Editor

A fully functional Rich Text Editor for both Android and iOS, based off the ZSSRichTextEditor project.

NOTE

We (Headstorm) forked zss-react-native into the Headstorm account. You can find it (here)[https://github.com/Headstorm/react-native-zss-rich-text-editor]. We forked the original because Webview is no longer included in React-Native Core. The process for using this solution is documented in jira here

Development guide overview

This is the basic architecture of how the RTE works within React-Native. If you look through the three core files, RichTextEditor.js, const.js, WebviewMessageHandler.js with the diagram in mind, the way it works should become clear quickly.

As an example, if you want to add a some functionality that can be called from the Mobile_Physician code:

• You will need to create/expose a method on RichTextEditor.js

• You will need to create the constants in const.js

• You will need to include the message WebviewMessageHandler.js

• You will need to create/expose method on the editor in the editor.html file

  Now you can call the the method in step one in ProgressNote.native.tsx and send/recieve data

Update process

Unfortunately, Metro does not seems to support symlinking, so I make my changes locally in Mobile_Physician and then update the source code in the fork.

Be sure to

• Make changes to the repo and push up the changes to master
• run yarn add https://github.com/Headstorm/react-native-zss-rich-text-editor in Mobile_Physician. This will update the commit in the yarn lock, allowing you to access the latest version of the fork

Installation

npm i --save react-native-zss-rich-text-editor

On Android, add the following to the end of your android/app/build.gradle

project.afterEvaluate {
    apply from: '../../node_modules/react-native-zss-rich-text-editor/htmlCopy.gradle';
    copyEditorHtmlToAppAssets(file('../../node_modules/react-native-zss-rich-text-editor'))
}

Also, follow instructions here to add the native react-native-webview-bridge-updated dependency.

Usage

react-native-zss-rich-text-editor exports two Components and one const dictionary:

RichTextEditor

The editor component. Simply place this component in your view hierarchy to receive a fully functional Rich text Editor.

RichTextEditor takes the following optional props:

• initialTitleHTML

  HTML that will be rendered in the title section as soon as the component loads.

• initialContentHTML

  HTML that will be rendered in the content section on load.

• titlePlaceholder

  Text that will be used as a placeholder when no text is present in the title section.

• contentPlaceholder

  Text that will be used as a placeholder when no text is present in the content section.

• customCSS

  Any custom CSS styles that you want to inject to the editor.

• editorInitializedCallback

  A function that will be called when the editor has been initialized.

RichTextEditor also has methods that can be used on its ref to set styling at the current selection or cursor position:

• setBold()
• setItalic()
• setUnderline()
• heading1()
• heading2()
• heading3()
• heading4()
• heading5()
• heading6()
• setParagraph()
• removeFormat()
• alignLeft()
• alignCenter()
• alignRight()
• alignFull()
• insertBulletsList()
• insertOrderedList()
• insertLink(url, title)
• updateLink(url, title)
• insertImage(attributes)
• setSubscript()
• setSuperscript()
• setStrikethrough()
• setHR()
• setIndent()
• setOutdent()
• setBackgroundColor(color)
• setTextColor(color)

This method shows a dialog for setting a link title and url, that will be inserted at the current cursor location.

• showLinkDialog(optionalTitle = '', optionalUrl = '')

To adjust content, placeholders or css, use these methods

• setTitlePlaceholder(placeholder)
• setContentPlaceholder(placeholder)
• setCustomCSS(css)
• setTitleHTML(html)
• setContentHTML(html)

These methods are used when adding content such as images or links that will intefere with the cursor position. prepareInsert saves the current selection, and restoreSelection will replace it after the insertion is done. It is called implicitly by insertImage and insertLink so they should probably never be called directly.

• prepareInsert()
• restoreSelection()

To get the content or title HTML, use these asynchronous methods.

• async getTitleHtml()
• async getTitleText()
• async getContentHtml()
• async getSelectedText()

To focus or blur sections, use these methods

• focusTitle()
• focusContent()
• blurTitleEditor()
• blurContentEditor()

To know when the title or content are in focus, use the following methods.

• setTitleFocusHandler(callbackHandler)
• setContentFocusHandler(callbackHandler)

This method registers a function that will get called whenver the cursor position changes or a change is made to the styling of the editor at the cursor's position., The callback will be called with an array of actions that are active at the cusor position, allowing a toolbar to respond to changes.

• registerToolbar(listener)

Example Usage:

<RichTextEditor
  ref={(r) => this.richtext = r}
  initialTitleHTML={'Title!!'}
  initialContentHTML={'Hello <b>World</b> <p>this is a new paragraph</p> <p>this is another new paragraph</p>'}
  editorInitializedCallback={() => this.onEditorInitialized()}
/>

RichTextToolbar

This is a Component that provides a toolbar for easily controlling an editor. It is designed to be used together with a RichTextEditor component.

The RichTextToolbar has one required property:

• getEditor()

Which must provide a function that returns a ref to a RichTextEditor component.

This is because the ref is not created until after the first render, before which the toolbar is rendered. This means that any ref passed directly will inevitably be passed as undefined.

Other props supported by the RichTextToolbar component are:

• actions

  An array of actions to be provided by this toolbar. The default actions are:

  • actions.insertImage
  • actions.setBold
  • actions.setItalic
  • actions.insertBulletsList
  • actions.insertOrderedList
  • actions.insertLink

• onPressAddLink

• onPressAddImage

  Functions called when the addLink or addImage actions are tapped.

• selectedButtonStyle

• iconTint

• selectedIconTint

• unselectedButtonStyle

  These provide options for styling action buttons.

• renderAction

  Altenatively, you can provide a render function that will be used instead of the default, so you can fully control the tollbar design.

• iconMap

  RichTextToolbar comes with default icons for the default actions it renders. To override those, or to add icons for non-default actions, provide them in a dictionary to this prop.

Example Usage:

<RichTextToolbar
	getEditor={() => this.richtext}
/>

actions

This is a set of consts of all supported actions. These will be passed in arrays to all callbacks registered with the editor using the registerToolbar() method.

{
	setTitleHtml: 'SET_TITLE_HTML',
  	setContentHtml: 'SET_CONTENT_HTML',
  	getTitleHtml: 'GET_TITLE_HTML',
  	getTitleText: 'GET_TITLE_TEXT',
 	getContentHtml: 'GET_CONTENT_HTML',
  	getSelectedText: 'GET_SELECTED_TEXT',
  	blurTitleEditor: 'BLUR_TITLE_EDITOR',
  	blurContentEditor: 'BLUR_CONTENT_EDITOR',
  	focusTitle: 'FOCUS_TITLE',
  	focusContent: 'FOCUS_CONTENT',

  	setBold: 'bold',
  	setItalic: 'italic',
  	setUnderline: 'underline',
  	heading1: 'h1',
  	heading2: 'h2',
  	heading3: 'h3',
  	heading4: 'h4',
  	heading5: 'h5',
  	heading6: 'h6',
  	setParagraph: 'SET_PARAGRAPH',
  	removeFormat: 'REMOVE_FORMAT',
  	alignLeft: 'justifyLeft',
  	alignCenter: 'justifyCenter',
  	alignRight: 'justifyRight',
  	alignFull: 'justifyFull',
  	insertBulletsList: 'unorderedList',
  	insertOrderedList: 'orderedList',
  	insertLink: 'INST_LINK',
  	updateLink: 'UPDATE_LINK',
  	insertImage: 'INST_IMAGE',
  	setSubscript: 'subscript',
  	setSuperscript: 'superscript',
  	setStrikethrough: 'strikeThrough',
  	setHR: 'horizontalRule',
  	setIndent: 'indent',
  	setOutdent: 'outdent',
  	setTitlePlaceholder: 'SET_TITLE_PLACEHOLDER',
  	setContentPlaceholder: 'SET_CONTENT_PLACEHOLDER',
  	setTitleFocusHandler: 'SET_TITLE_FOCUS_HANDLER',
  	setContentFocusHandler: 'SET_CONTENT_FOCUS_HANDLER',
  	prepareInsert: 'PREPARE_INSERT',
  	restoreSelection: 'RESTORE_SELECTION',
  	setCustomCSS: 'SET_CUSTOM_CSS',
  	setTextColor: 'SET_TEXT_COLOR',
  	setBackgroundColor: 'SET_BACKGROUND_COLOR',
}

Attribution

react-native-zss-rich-text-editor is a wrapper around the amazing ZSSRichTextEditor project. It also communicates with the editor using (a tiny fork) of the awesome react-native-webview-bridge project.