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2021
04-07

react实现Radio组件的示例代码

本文旨在用最清楚的结构去实现一些组件的基本功能。希望和大家一起学习，共同进步

效果展示：

测试组件：

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class Test extends Component {
  constructor(props) {
    super(props)
    this.state = {
      active:1
    }
  }
  onGroupChange(value) {
    this.setState({
      active: value
    })
  }
  render() {
    return (
     <div>
      <RadioGroup onChange={this.onGroupChange.bind(this)} active={this.state.active}>
         <Radio value={1}>使用余额支付</Radio>
         <Radio value={2}>使用微信支付</Radio>
      </RadioGroup>
      <Button onClick={()=>{
             console.log("此时选中的是:"+this.state.active)
           }}>下一步</Button>
     </div>
      )
  }
}
export default Test;

RadioGroup：

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import React, { Component } from 'react';
class RadioGroup extends Component {
  handleActiveChange(value) {
    console.log(`${value}被选中了`)
    this.props.onChange(value)
  }
  render() {
    return (
      <div>
        {
          React.Children.map(this.props.children, child => {
            let isActive = this.props.active === child.props.value ? true : false
            return React.cloneElement(child, {
              label: child.props.children,
              value: child.props.value,
              active: isActive,
              onClick: this.handleActiveChange.bind(this)
            })
          })
        }
      </div>
    )
  }
}
export default RadioGroup;

Radio.jsx：

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import React, { Component } from 'react';
import "./radio.scss"
class Radio extends Component {
  render() {
    return (
      <div className="radio-wrap" onClick={this.props.onClick.bind(this,this.props.value)}>
        <div className="left">
          <div className={`circle ${this.props.active === true ? 'active' : ''} `}>
            <div className="fork"></div>
          </div>
          <div className="label">{this.props.label}</div>
        </div>
      </div>
    )
  }
}
export default Radio;

Radio.scss：

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.radio-wrap {
  height: 40px;
  background-color: #ffffff;
  display: flex;
  align-items: center;
  padding: 0px 30px;
 
  &:active {
    background-color: rgb(221, 221, 221);
  }
 
  .left {
    display: inline-block;
 
    .circle {
      display: inline-block;
      height: 22px;
      width: 22px;
      box-sizing: border-box;
      border: 1px solid #c5c9cd;
      border-radius: 50%;
      background-color: #ffffff;
      position: relative;
 
       
    }
    .active{
      background-color: #1eb94a;
      .fork {
        height: 12px;
        width: 5px;
        border-right: 1.5px solid #ffffff;
        border-bottom: 1.5px solid #ffffff;
        position: absolute;
        top: 40%;
        left: 50%;
        transform: translate(-50%, -50%) rotate(45deg);
      }
    }
 
    .label {
      vertical-align: top;
      margin-left: 10px;
      display: inline-block;
      height: 22px;
      line-height: 22px;
      font-size: 14px;
    }
  }
}

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