react写一个select组件的实现代码

<select onChange={(value) => {this.value=value}}
  <option value='1'>man</option>
  <option value='0'>woman</option>
</select>

import {MobileSelect, MobileOption} from '../../components/MobileSelect';

 <MobileSelect
  disabled={isDisabled}
  value={data.clarity || ringResponse.clarity || 'Flawless'}
  style={{ width: '132px' }}
  onChange={(v) => this.changeDataValue('clarity', v)}
 >
  {
   (clarity || []).map((item, i) => {
    return (
     <MobileOption key={i + ''} value={item.code}>{item.title}</MobileOption>
    );
   })
  }
 </MobileSelect>

import {observable} from 'mobx';
import {observer} from 'mobx-react';
import React from 'react';
import {Icon} from 'antd';
import './index.less';

interface IProps {
 disabled"htmlcode">

.Mobile-Select {
 display: inline-block;
 min-width: 100px;
 margin: 0 6px;
 .select-wrap {
  border: 1px solid #e0c0a2;
  border-radius: 4px;
  padding: 5px 11px;
  display: flex;
  flex-direction: row-reverse;
  justify-content: space-between;
  align-items: center;
  .select-icon {
   transition: .3s;
   float: right;
  }
 }
 .option-wrap {
  box-shadow: 0 0 5px #333;
  z-index: 1000;
  border-radius: 5px;
  .option-item {
   background-color: #fff;
   padding: 2px 11px;
   min-width: 100px;
   &.selected {
    background-color: #fbe6d0;
   }
  }
 }
}


总的来说只实现了select的基本功能。有改进的地方请指点一二。
PS：React Select默认值选中问题


import React from "react";
import { render } from "react-dom";

class App extends React.Component {
 constructor(props) {
  super(props);
  this.state = {
   projects: [],
   value: ""
  };
 }
 componentDidMount() {
  // 模拟ajax调用，成功之后把需要改变的默认值赋值给this.state.value
  setTimeout(() => {
   this.setState({
    projects: [
     { id: 1, name: "花生" },
     { id: 2, name: "苹果" },
     { id: 3, name: "杨桃" }
    ],
    value: 1
   });
  }, 3000);
 }
 handleClick() {
  this.setState({
   projects: [
    { id: 4, name: "水果" },
    { id: 5, name: "西瓜" },
    { id: 6, name: "哈哈哈" }
   ],
   value: 4
  });
 }
 handleChange = e => {
  this.setState({
   value: e.target.value
  });
 };
 render() {
  let projects = this.state.projects;
  return (
   <div>
    <button onClick={this.handleClick.bind(this)}>异步拉取数据</button>
    {/* 这里不用再去判断project的长度是否大于0，在ajax里面做判断就行，如果小于零或者不存在它就是默认值 */}
    <select
     defaultValue=""
     value={this.state.value}
     onChange={this.handleChange}
    >
     {projects.length > 0 &&
      projects.map((item, i) => {
       return (
        <option key={i} value={item.id}>
         {item.name}
        </option>
       );
      })}
    </select>
   </div>
  );
 }
}

render(<App />, document.getElementById("root"));


以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。