在React中显示或隐藏元素

Question

我第一次弄乱React.js，找不到通过click事件在页面上显示或隐藏内容的方法。我没有在页面上加载任何其他库，所以我正在寻找使用React库的本机方法。到目前为止，这就是我所拥有的。当点击事件触发时，我想显示结果div。

var Search= React.createClass({
    handleClick: function (event) {
        console.log(this.prop);
    },
    render: function () {
        return (
            <div className="date-range">
                <input type="submit" value="Search" onClick={this.handleClick} />
            </div>
        );
    }
});

var Results = React.createClass({
    render: function () {
        return (
            <div id="results" className="search-results">
                Some Results
            </div>
        );
    }
});

React.renderComponent(<Search /> , document.body);

Answer 1

大约在2020年做出反应

在onClick回调中，调用状态挂钩的
setter函数以更新状态并重新渲染：

const Search = () => {

  const [showResults, setShowResults] = React.useState(false)

  const onClick = () => setShowResults(true)

  return (

    <div>

      <input type="submit" value="Search" onClick={onClick} />

      { showResults ? <Results /> : null }

    </div>

  )

}



const Results = () => (

  <div id="results" className="search-results">

    Some Results

  </div>

)



ReactDOM.render(<Search />, document.querySelector("#container"))


<script src="https://cdnjs.cloudflare.com/ajax/libs/react/16.13.1/umd/react.production.min.js"></script>

<script src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/16.13.1/umd/react-dom.production.min.js"></script>



<div id="container">

  <!-- This element's contents will be replaced with your component. -->

</div>

JSFiddle

反应约2014年

关键是使用来更新点击处理程序中组件的状态setState。应用状态更改后，将render使用新状态再次调用该方法：

var Search = React.createClass({

    getInitialState: function() {

        return { showResults: false };

    },

    onClick: function() {

        this.setState({ showResults: true });

    },

    render: function() {

        return (

            <div>

                <input type="submit" value="Search" onClick={this.onClick} />

                { this.state.showResults ? <Results /> : null }

            </div>

        );

    }

});



var Results = React.createClass({

    render: function() {

        return (

            <div id="results" className="search-results">

                Some Results

            </div>

        );

    }

});



ReactDOM.render( <Search /> , document.getElementById('container'));


<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.6.2/react.min.js"></script>

<script src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/15.6.2/react-dom.min.js"></script>



<div id="container">

  <!-- This element's contents will be replaced with your component. -->

</div>

JSFiddle