Radio buttons

<! DOCTYPEhtml>
<html>

<head>
    <meta charset="UTF-8" />
    <title>Hello React!</title>
    <script src="https://cdn.staticfile.org/react/16.4.0/umd/react.development.js"></script>
    <script src="https://cdn.staticfile.org/react-dom/16.4.0/umd/react-dom.development.js"></script>
    <script src="https://cdn.staticfile.org/babel-standalone/6.26.0/babel.min.js"></script>
    <style>
        .item{
            width: 20px;
            height: 20px;
            margin: 20px 0;
            border: 1px solid # 666;
        }
        .item>div{
            height: 20px;
        }
        .checked{
            background: red;
        }
    </style>
</head>

<body>
    <div id="root"></div>
    <script type="text/babel">
        class CheckBox extends React.Component {
            constructor(props) {
                super(props);
                this.state = {
                    tagIndexList: [].value: [].index:null.arr: [{item: "item1"
                        },
                        {
                            item: "item2"
                        },
                        {
                            item: "item3"
                        },
                        {
                            item: "item4"}};this.handleClick = this.handleClick.bind(this);
            }
            handleClick(num,item){
             this.setState({
                index:num
             })
             console.log(item);
            }

            render() {
                return (
                    <div>
                        {
                            this.state.arr.map((item, index) => {
                                return (
                                    <div key={item.item}  className="item">
                                       <div className={this.state.index= = =index?"checked":""} onClick={()= >this.handleClick(index,item.item)}></div><span>{item.item}</span>
                                    </div>)})}</div>
                )
            }
        }
        ReactDOM.render(
            <CheckBox />.document.getElementById('root'))</script>
</body>

</html>
Copy the code

Check box

<! DOCTYPEhtml>
<html>

<head>
    <meta charset="UTF-8" />
    <title>Hello React!</title>
    <script src="https://cdn.staticfile.org/react/16.4.0/umd/react.development.js"></script>
    <script src="https://cdn.staticfile.org/react-dom/16.4.0/umd/react-dom.development.js"></script>
    <script src="https://cdn.staticfile.org/babel-standalone/6.26.0/babel.min.js"></script>
    <style>
        .item{
            width: 20px;
            height: 20px;
            margin: 20px 0;
            border: 1px solid # 666;
        }
        .item>div{
            height: 20px;
        }
        .checked{
            background: red;
        }
    </style>
</head>

<body>
    <div id="root"></div>
    <script type="text/babel">
        class CheckBox extends React.Component {
            constructor(props) {
                super(props);
                this.state = {
                    tagIndexList: [].value: [].index:null.arr: [{item: "item1"
                        },
                        {
                            item: "item2"
                        },
                        {
                            item: "item3"
                        },
                        {
                            item: "item4"}};this.handleClick = this.handleClick.bind(this);
            }
            handleClick(num,item){
               let items = this.state.value.slice();
               let index = items.indexOf(item);
               index === -1 ? items.push(item) : items.splice(index, 1);
               this.setState(({ tagIndexList }) = > ({
                    tagIndexList: tagIndexList.includes(num)
                        ? tagIndexList.filter(item= >item ! == num) : [...tagIndexList, num],value: items
                }));
                console.log(items);
            }
            render() {
                return (
                    <div>
                        {
                            this.state.arr.map((item, index) => {
                                return (
                                    <div key={item.item}  className="item">
                                       <div className={this.state.tagIndexList.includes(index)?"checked":""} onClick={()= >this.handleClick(index,item.item)}></div><span>{item.item}</span>
                                    </div>)})}</div>
                )
            }
        }
        ReactDOM.render(
            <CheckBox />.document.getElementById('root'))</script>
</body>

</html>
Copy the code

Welcome to pay attention to my public account “front-end history robbery Road”

​

Reply keyword e-books, you can get nearly 12 front-end popular e-books.

​

Reply keywords little Red Book 4th edition, you can get the latest “JavaScript advanced Programming” (4th edition) ebook.

​

You can also add me to wechat. I have wooed many IT bigwigs and created a technical exchange and article sharing group. Welcome to join.

​

  • Author: Vam’s Golden Bean Road

  • Main area: front-end development

  • My wechat account is Maomin9761

  • Wechat public number: the front end of the road through robbery

​