使用React.js写一个类似单选框与复选框的功能

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单选框

<!DOCTYPE html>
<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>

在这里插入图片描述















复选框

<!DOCTYPE html>
<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>




作者：Vam的金豆之路

主要领域：前端开发

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