react-codemirror2

What is react-codemirror2?

The react-codemirror2 package is a React component wrapper for CodeMirror, a versatile text editor implemented in JavaScript for the browser. It allows you to integrate CodeMirror into your React applications, providing a rich text editor with syntax highlighting, autocompletion, and other advanced features.

What are react-codemirror2's main functionalities?

Basic Usage

This code demonstrates the basic usage of the react-codemirror2 package. It sets up a CodeMirror editor with JavaScript syntax highlighting and a material theme. The editor's value is controlled by React state.

import React from 'react';
import { Controlled as CodeMirror } from 'react-codemirror2';
import 'codemirror/lib/codemirror.css';
import 'codemirror/theme/material.css';

const MyEditor = () => {
  const [value, setValue] = React.useState('');

  return (
    <CodeMirror
      value={value}
      options={{
        mode: 'javascript',
        theme: 'material',
        lineNumbers: true
      }}
      onBeforeChange={(editor, data, value) => {
        setValue(value);
      }}
    />
  );
};

export default MyEditor;

Event Handling

This code demonstrates how to handle events in the react-codemirror2 package. It logs messages to the console when the content changes or when the editor loses focus.

import React from 'react';
import { Controlled as CodeMirror } from 'react-codemirror2';
import 'codemirror/lib/codemirror.css';
import 'codemirror/theme/material.css';

const MyEditor = () => {
  const [value, setValue] = React.useState('');

  return (
    <CodeMirror
      value={value}
      options={{
        mode: 'javascript',
        theme: 'material',
        lineNumbers: true
      }}
      onBeforeChange={(editor, data, value) => {
        setValue(value);
      }}
      onChange={(editor, data, value) => {
        console.log('Content changed:', value);
      }}
      onBlur={(editor, event) => {
        console.log('Editor lost focus');
      }}
    />
  );
};

export default MyEditor;

Custom Key Bindings

This code demonstrates how to set custom key bindings in the react-codemirror2 package. It uses the 'sublime' keymap for the CodeMirror editor.

import React from 'react';
import { Controlled as CodeMirror } from 'react-codemirror2';
import 'codemirror/lib/codemirror.css';
import 'codemirror/theme/material.css';
import 'codemirror/keymap/sublime';

const MyEditor = () => {
  const [value, setValue] = React.useState('');

  return (
    <CodeMirror
      value={value}
      options={{
        mode: 'javascript',
        theme: 'material',
        lineNumbers: true,
        keyMap: 'sublime'
      }}
      onBeforeChange={(editor, data, value) => {
        setValue(value);
      }}
    />
  );
};

export default MyEditor;

Other packages similar to react-codemirror2

react-ace

react-ace is a React component for the Ace editor. It provides similar functionalities to react-codemirror2, such as syntax highlighting, autocompletion, and customizable themes. However, it uses the Ace editor instead of CodeMirror, which may have different performance characteristics and feature sets.

react-monaco-editor

react-monaco-editor is a React component for the Monaco editor, which is the editor that powers Visual Studio Code. It offers advanced features like IntelliSense, parameter hints, and a rich API for customization. Compared to react-codemirror2, it provides a more feature-rich editing experience but may have a steeper learning curve.

react-simple-code-editor

react-simple-code-editor is a lightweight code editor component for React. It provides basic syntax highlighting and editing capabilities using Prism.js. It is simpler and more lightweight compared to react-codemirror2, making it suitable for use cases where a full-fledged editor is not required.

README

react-codemirror2

import CodeMirror from 'react-codemirror2'

<CodeMirror
  defaultValue='react-codemirror2'
  options={{theme: 'material', lineNumbers: true}}
  editorWillMount={(cm) => {
  }}
  editorDidMount={(cm) => {
  }}
  editorDidConfigure={(cm) => {
  }}
  editorWillUnmount={(cm) => {
  }}
  onSetDefaultValue={(defaultValue) => {
  }}
  onChange={(internalValue) => {
  }}
  onCursorActivity={() => {
  }}
  onViewportChange={(cm, viewportStart, viewportEnd) => {
  }}
  onGutterClick={(cm, lineNumber, event) => {
  }}
  onFocus={() => {
  }}
  onBlur={() => {
  }}
  onScroll={() => {
  }}
  onUpdate={() => {
  }}
/>

// better docs coming soon. all props are optional...