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Angular封装WangEditor富文本组件的方法

2024-04-02 19:55

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富文本组件是web程序中很常用的一个组件，特别是要开发一个博客，论坛这类的网站后台。

得益于Angular的强大，封装WangEditor组件非常简单

1.使用yarn或者npm安装wangeditor

yarn add wangeditor

2.创建一个Angular的组件

ng g c q-wang-editor

3.封装组件逻辑

3.1 模板

<div #wang></div>

3.2 ts逻辑


import { Component, ElementRef, EventEmitter, Input, OnDestroy, OnInit, Output, ViewChild, ViewEncapsulation } from '@angular/core';
import { ControlValueAccessor } from '@angular/forms';

import E from "wangeditor"
import hljs from 'highlight.js'
import "node_modules/highlight.js/styles/xcode.css"

@Component({
  selector: 'q-wang-editor',
  templateUrl: './q-wang-editor.component.html',
  styleUrls: [
    './q-wang-editor.component.less',
    '../../../../../node_modules/highlight.js/styles/xcode.css'],
  encapsulation: ViewEncapsulation.None,
})
export class QWangEditorComponent implements OnInit, ControlValueAccessor,OnDestroy {

  @ViewChild("wang")
  editor!: ElementRef;

  @Input() value: string = '';

  @Input() height = 300;

  @Output() valueChange = new EventEmitter();

  onChange: ((value: string) => {}) | undefined;

  html = ''

  wangEditor: E | undefined;

  constructor() { }
  ngOnDestroy(): void {
    this.wangEditor?.destroy();
  }
  writeValue(obj: any): void {
    this.html = obj;
    this.wangEditor?.txt.html(this.html)
  }
  registerOnChange(fn: any): void {
  }
  registerOnTouched(fn: any): void {
  }

  ngOnInit(): void {
    setTimeout(() => {
      this.wangEditor = new E(this.editor.nativeElement)
      this.wangEditor.config.zIndex = 500;
      this.wangEditor.config.height = this.height
      this.wangEditor.highlight = hljs;
      this.wangEditor.config.onchange = (html: any) => {
        this.valueChange.emit(html)
        if (this.onChange) {
          this.onChange(html);
        }
      }
      this.wangEditor.config.onchangeTimeout = 500;
      this.wangEditor.create();
      this.wangEditor.txt.html(this.html)
    }, 200);
  }

}

大致思路：

使用ViewChild引用html的dom元素
在OnInit的成功后，初始化WangEditor编辑器，把模板中的ElementRef放入到WangEditor的容器中去，让WangEditor去控制界面的dom操作。
实现ControlValueAccessor，让这个组件支持Angular的表单验证。
实现ngOnDestroy，组件在销毁的时候，调用WangEditor的destory

4.使用组件