页面编辑器CodeMirror初始化不显示行号或文本内容

 延迟刷新

本来想延迟100毫秒的，但是会出现样式向左偏移的情况，于是试了试500毫秒，发现就没有问题了，可能是样式什么是需要一个加载过程吧。

  useEffect(() => {editorRef.current?.setValue(value || '');setTimeout(() => {editorRef.current?.refresh();}, 500);}, [value]);

另外记录一下写的编辑器组件

npm install codemirror  --save

import CodeMirror, { EditorFromTextArea } from 'codemirror';
import 'codemirror/lib/codemirror.css';
import React, { forwardRef, useEffect, useImperativeHandle, useRef } from 'react';// 导入需要的语言模式和样式主题
import 'codemirror/addon/fold/foldgutter.css';
import 'codemirror/addon/hint/javascript-hint.js'; // 自动提示
import 'codemirror/mode/htmlmixed/htmlmixed';
import 'codemirror/mode/javascript/javascript';
import 'codemirror/mode/xml/xml';
import 'codemirror/theme/material.css'; // 加载的样式主题 https://codemirror.net/5/theme/// 折叠代码块
import 'codemirror/addon/fold/brace-fold.js';
import 'codemirror/addon/fold/comment-fold.js';
import 'codemirror/addon/fold/foldcode.js';
import 'codemirror/addon/fold/foldgutter.js';import 'codemirror/addon/selection/active-line.js'; // 当前行高亮import 'codemirror/addon/hint/anyword-hint.js'; // end
import 'codemirror/addon/hint/show-hint.css'; // start-ctrl+空格代码提示补全
import 'codemirror/addon/hint/show-hint.js';// 定义组件属性类型
interface CodeMirrorEditorProps {ref: any;readOnly: boolean;value: string;language: string;theme?: 'default' | 'material';height?: number;width?: number;onChange: (value: string) => void;onShiftEnter?: () => void;onBlur?: (value: string) => void;onChangeLine?: () => void;
}const CodeMirrorEditor: React.FC<CodeMirrorEditorProps> = forwardRef((props, ref) => {const { language, readOnly, value, theme, width, height } = props;const textareaRef = useRef<HTMLTextAreaElement>(null);const editorRef = useRef<EditorFromTextArea>();useImperativeHandle(ref, () => ({refresh: () => {editorRef.current?.refresh();},}));/** 失焦 */const blur = (instance: any) => {if (props.onBlur) {props.onBlur(instance.doc.getValue());}};/** 键盘按键按下 */const keydown = (_: any, change: any) => {if (change.shiftKey === true && change.keyCode === 13) {if (props.onShiftEnter) {props.onShiftEnter();}change.preventDefault();}};/** 编辑内容变化 */const codemirrorValueChange = (doc: any, change: any) => {doc.eachLine((line: any) => {if (line.text.startsWith('//') || line.text.startsWith('#')) {doc.addLineClass(line, 'wrap', 'notes');} else if (line.wrapClass === 'notes') {doc.removeLineClass(line, 'wrap', 'notes');}});if (change.origin !== 'setValue') {if (props.onChange) {props.onChange(doc.getValue());}}};const initCodeMirror = () => {const editorConfig = {readOnly: readOnly,tabSize: 4, // 制表符的宽度。默认为 4。fontSize: '16px', // 字体大小styleActiveLine: !readOnly, // 选中行高亮autoCloseBrackets: true, // 在键入时自动关闭括号和引号showCursorWhenSelecting: true, // 当选择处于活动状态时是否应绘制光标。默认为 false。这里设置成自动补全lineWrapping: true, // ，CodeMirror 是否应该滚动或换行。默认为false(滚动)。这里设置成换行lineNumbers: true, // 是否在编辑器左侧显示行号firstLineNumber: 1,fullScreen: true, //当设置为 时true，将使编辑器全屏显示（如占据整个浏览器窗口）。mode: language, // 使用模式// theme: 'default' // 编辑器样式的主题 必须确保.cm-s-[name] 加载定义相应样式的 CSS 文件。默认值为"default"，颜色包含在 中codemirror.css。可以一次使用多个主题类，例如将和类"foo bar"都分配给编辑器。cm-s-foocm-s-bartheme: theme || 'default', // 编辑器样式的主题 必须确保.cm-s-[name] 加载定义相应样式的 CSS 文件。默认值为"default"，颜色包含在 中codemirror.css。可以一次使用多个主题类，例如将和类"foo bar"都分配给编辑器。cm-s-foocm-s-barfoldGutter: true,gutters: ['CodeMirror-linenumbers', 'CodeMirror-foldgutter'],extraKeys: { Ctrl: 'autocomplete' },};editorRef.current = CodeMirror.fromTextArea(textareaRef.current!, editorConfig);// 监听编辑器内容变化事件editorRef.current.on('change', codemirrorValueChange);editorRef.current.on('keydown', keydown);editorRef.current.on('blur', blur);// const { value, width, height } = props;editorRef.current.setValue(value || '');if (width || height) {editorRef.current.setSize(width, height);}};useEffect(() => {if (textareaRef.current) {initCodeMirror();}return () => {// 清理和销毁编辑器实例editorRef.current?.toTextArea();};}, [readOnly, textareaRef, theme, width, height, language]);useEffect(() => {editorRef.current?.setValue(value || '');setTimeout(() => {editorRef.current?.refresh();}, 500);}, [value]);return <textarea ref={textareaRef} />;
});export default CodeMirrorEditor;

使用

import { CodeMirrorEditor } from '@/components';
<CodeMirrorEditorheight={550}theme={'default'}readOnly={false}value={content || ''}language="javascript"onChange={(value) => {console.log('值'，value)}}/>