【实战】React 必会第三方插件 —— Ace editor 中 删除部分内容后，代码提示依旧显示（不用重输）

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• 文档： [ace-builds/README.md]：(https://github.com/ajaxorg/ace-builds/blob/master/README.md)

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一、问题

Ace editor 在输入关键字时，每次键入都会有提示变动，一旦删除一个字母，提示即刻消失，必须再次输入后才会有提示

二、解决

editor 保存到 state 中，监听onChange事件，执行 startAutocomplete 命令即可：

handleOnChange() {
	editor.execCommand('startAutocomplete')
}

这样不管是输入还是删除都会自动触发提示（自动完成）

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over

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三、拓展学习

1.AceEditor

示例demo：https://securingsincity.github.io/react-ace/

在 react 中使用 AceEditor 需要引入以下两个依赖：

npm install react-ace ace-builds

或

yarn add react-ace ace-builds

截止2023.02.20，最新版本号为：

• react-ace：10.1.0
• ace-builds：1.15.2

代码仓库地址：

• react-ace：https://github.com/securingsincity/react-ace
• ace-builds：https://github.com/ajaxorg/ace

使用样例：

// 核心组件
import AceEditor from 'react-ace'
// 引入对应的语言
import 'ace-builds/src-noconflict/mode-javascript'
//以下import的是风格
import 'ace-builds/src-noconflict/theme-eclipse'
// 代码提示
import 'ace-builds/src-noconflict/ext-language_tools'
import 'ace-builds/webpack-resolver'
import './code.less'
 
const CodeView = () => {
  return (
	<AceEditor
      // name类似于id和key需要保持唯一性
      name='myCodeView'
      // 字体大小
      fontSize={16}
      style={{ width: '80%', height: '80%', minHeight: 80 }}
      mode='javascript'
	  theme='eclipse'
	 />
  )
}
 
export default CodeView

常用属性：

mode：编辑器的整体模式或样式，这里取值为 markdown，表明需要用这个编辑器来输入 markdown文本，这样编辑器就会进行相应的初始设置。
theme：编辑器主题，这里使用了 github这个主题。
wrapEnabled：当输入的一句文本比一行的长度要长时，是否允许换行。
tabSize：使用几个空格来表示表示一次 Tab按键。
fontSize：文本的字体大小
height：编辑器的高度，单位为 px。
width：编辑器的宽度，单位为 px。
debounceChangePeriod：多长时间对输入响应一次，单位为 ms，类似于节流。
onChange：文本框内容发生变化时的回调函数。
onScroll：文本框内容发生滚动时的回调函数。
name：编辑器的 id。
editorProps：当在文本框内输入内容时，是否需要滚动条进行响应的滚动定位。

全部属性：

Prop	Default	Type	Description
name	‘ace-editor’	String	Unique Id to be used for the editor
placeholder	null	String	Placeholder text to be displayed when editor is empty
mode	‘’	String	Language for parsing and code highlighting
theme	‘’	String	theme to use
value	‘’	String	value you want to populate in the code highlighter
defaultValue	‘’	String	Default value of the editor
height	‘500px’	String	CSS value for height
width	‘500px’	String	CSS value for width
className		String	custom className
fontSize	12	Number	pixel value for font-size
showGutter	true	Boolean	show gutter
showPrintMargin	true	Boolean	show print margin
highlightActiveLine	true	Boolean	highlight active line
focus	false	Boolean	whether to focus
cursorStart	1	Number	the location of the cursor
wrapEnabled	false	Boolean	Wrapping lines
readOnly	false	Boolean	make the editor read only
minLines		Number	Minimum number of lines to be displayed
maxLines		Number	Maximum number of lines to be displayed
enableBasicAutocompletion	false	Boolean	Enable basic autocompletion
enableLiveAutocompletion	false	Boolean	Enable live autocompletion
enableSnippets	false	Boolean	Enable snippets
tabSize	4	Number	tabSize
debounceChangePeriod	null	Number	A debounce delay period for the onChange event
onLoad		Function	called on editor load. The first argument is the instance of the editor
onBeforeLoad		Function	called before editor load. the first argument is an instance of ace
onChange		Function	occurs on document change it has 2 arguments the value and the event.
onCopy		Function	triggered by editor copy event, and passes text as argument
onPaste		Function	Triggered by editor paste event, and passes text as argument
onSelectionChange		Function	triggered by editor selectionChange event, and passes a Selection as it’s first argument and the event as the second
onCursorChange		Function	triggered by editor changeCursor event, and passes a Selection as it’s first argument and the event as the second
onFocus		Function	triggered by editor focus event
onBlur		Function	triggered by editor blur event.It has two arguments event and editor
onInput		Function	triggered by editor input event
onScroll		Function	triggered by editor scroll event
onValidate		Function	triggered, when annotations are changed
editorProps		Object	properties to apply directly to the Ace editor instance
setOptions		Object	options to apply directly to the Ace editor instance
keyboardHandler		String	corresponding to the keybinding mode to set (such as vim or emacs)
commands		Array	new commands to add to the editor
annotations		Array	annotations to show in the editor i.e. [{ row: 0, column: 2, type: 'error', text: 'Some error.'}], displayed in the gutter.(type:‘error’,‘info’,‘warning’)
markers		Array	markers to show in the editor, i.e. [{ startRow: 0, startCol: 2, endRow: 1, endCol: 20, className: 'error-marker', type: 'background' }]. Make sure to define the class (eg. “.error-marker”) and set position: absolute for it.
style		Object	camelCased properties

不同文件中可以引入不同的语言支持包：

import 'brace/mode/javascript';//
import 'brace/mode/html';//
import 'brace/mode/java';//
import 'brace/mode/python';//
import 'brace/mode/lua';//
import 'brace/mode/xml';//
import 'brace/mode/ruby';//
import 'brace/mode/sass';
import 'brace/mode/markdown';//
import 'brace/mode/mysql';
import 'brace/mode/json';//
import 'brace/mode/css';//
import 'brace/mode/typescript';

2.其他代码编辑器

CodeMirror

• 官网：https://codemirror.net/
• github：https://github.com/codemirror/CodeMirror
• 示例代码：https://uiwjs.github.io/react-codemirror/

Monaco

• github：https://github.com/microsoft/monaco-editor

diff2html

• 官网：https://diff2html.xyz/
• gitbub：https://github.com/rtfpessoa/diff2html

ace中的命令

主要内容说完，结尾列举一些 ace.js 中定义的命令:

命令	描述	快捷键
addCursorAbove	Add cursor above	:Ctrl-Alt-Up
addCursorBelow	Add cursor below	Ctrl-Alt-Down
addCursorAboveSkipCurrent	Add cursor above (skip current)	Ctrl-Alt-Shift-Up
addCursorBelowSkipCurrent	Add cursor below (skip current)	Ctrl-Alt-Shift-Down
selectMoreBefore	Select more before	Ctrl-Alt-Left
selectMoreAfter	Select more after	Ctrl-Alt-Right
selectNextBefore	Select next before	Ctrl-Alt-Shift-Left
selectNextAfter	Select next after	Ctrl-Alt-Shift-Right
toggleSplitSelectionIntoLines	Split into lines	Ctrl-Alt-L
splitSelectionIntoLines	Split into lines
alignCursors	Align cursors	Ctrl-Alt-A
findAll	Find all	Ctrl-Alt-K
singleSelection	Single selection
startAutocomplete	Start auto complete	Ctrl-Space / Ctrl-Shift-Space / Alt-Space

其他还有些命令是根据主题定制的，这里就不再赘述

其他命令来源（可以自定义命令来处理一组自定义操作）：

• https://github.com/ajaxorg/ace-builds/blob/master/src/keybinding-vscode.js
• https://github.com/ajaxorg/ace-builds/blob/master/src/keybinding-sublime.js
• https://github.com/ajaxorg/ace-builds/blob/master/src/keybinding-emacs.js
• …