react項目中實現搜索關鍵字呈現高亮狀態（一）

最近有個需求，在一個react項目中，實現搜索關鍵字呈現高亮狀態。這個在普通的html文件中還好操作些，在react項目中有點懵逼了，因為react項目中很少操作dom，有點無從下手。但最后還是實現了效果，如下：

 

首先來看看如何在react中操作dom,廣大網友給出兩種方案：

一：使用選擇器：

1、引入react-dom     import ReactDom from 'react-dom' 2、給react節點設置id或類名等標識     <span id='tip'></span> 3、定義變量保存dom元素     var span = document.getElementById('tip') 4、通過ReactDom的findDOMNode()方法修改dom的屬性     ReactDom.findDOMNode(span).style.color = 'red'

二：使用ref屬性

1、給指定標簽設置ref屬性     <span ref='tip'></span> 2、通過this.refs.ref屬性值來修改標簽的屬性     this.refs.tip.style.color = "red"

我用第二種方案來操作的：

import React from 'react';
import {  Input } from 'antd';

const { Search } = Input;

// 高亮測試
class Highlight extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      text:<p>writing to a TLS enabled socket, node::StreamBase::Write calls node::TLSWrap::DoWrite with a freshly allocated WriteWrap object as first argument. If the DoWrite method does not return an error, this object is passed back to the caller as part of a StreamWriteResult structure. This may be exploited to corrupt memory leading to a Denial of Service or potentially other exploits\n" +
        HTTP Request Smuggling in nodejs Affected versions of Node.js allow two copies of a header field in a http request. For example, two Transfer-Encoding header fields. In this case Node.js identifies the first header field and ignores the second. This can lead to HTTP Request Smuggling (https://cwe.mitre.org/data/definitions/444.html).\n" +
        OpenSSL - EDIPARTYNAME NULL pointer de-reference (High) This is a vulnerability in OpenSSL which may be exploited through Node.js. You can read more about it in https://www.openssl.org/news/secadv/20201208.txt</p>
    };
  }

  findHighlight = (keyWord)=>{
      const str=keyWord.replace(/^(\s|\xA0)+|(\s|\xA0)+$/g, '');
    // eslint-disable-next-line react/no-string-refs
    const val= this.refs.tip.innerHTML;
    const content = this.searchdo(val, str);
    // eslint-disable-next-line react/no-string-refs
    this.refs.tip.innerHTML=content;
  };

  searchdo=(content,keyWord)=>{
    const keyWordArr = keyWord.split(' ');
    let re;
    for(let n = 0; n < keyWordArr.length; n +=1) {
      re = new RegExp(`${keyWordArr[n]}`,"gmi");
      // eslint-disable-next-line no-param-reassign
      content = content.replace(re,`<span style="color:#0f0;${keyWordArr[n]}</span>`);
    }
    return content;
  };

  render() {
    const { text} = this.state;
    return (
      <div>
        <Search
          placeholder="請輸入查找內容"
          onSearch={value => this.findHighlight(value)}
          style={{ width: 200 }}
        />
        <br />
        <br />
        <div
          style={{
            border:"1px solid #ccc",
            borderRadius:"4px",
            padding:"5px"
          }}
          ref="tip"
        >
          {text}
        </div>
      </div>
    );
  }
}

export default Highlight;

　　

然后就實現了上面的效果，但是這只是最初步的，如果需要完善功能還需要自己進一步改造。