如何在 React.js 中使用带有 div 的 onClick

Question

I'm making a very simple application where you can click on square divs to change their color from white to black. However, I'm having trouble. I'd like to use the onClick function to allow a user to click on a square to change its color, but it doesn't seem to be working. I've tried using spans and empty p tags, but that doesn't work either.

Here is the code in question:

var Box = React.createClass({
    getInitialState: function() {
        return {
            color: 'white'
        };
    },

    changeColor: function() {
        var newColor = this.state.color == 'white' ? 'black' : 'white';
        this.setState({
            color: newColor
        });
    },

    render: function() {
        return (
            <div>
                <div
                    style = {{background: this.state.color}}
                    onClick = {this.changeColor}
                >
                </div>
            </div>
        );
    }
});

Here's a link to my small project on CodePen. http://codepen.io/anfperez/pen/RorKge

Answer 1

This works

var Box = React.createClass({
    getInitialState: function() {
        return {
            color: 'white'
        };
    },

    changeColor: function() {
        var newColor = this.state.color == 'white' ? 'black' : 'white';
        this.setState({ color: newColor });
    },

    render: function() {
        return (
            <div>
                <div
                    className='box'
                    style={{background:this.state.color}}
                    onClick={this.changeColor}
                >
                    In here already
                </div>
            </div>
        );
    }
});

ReactDOM.render(<Box />, document.getElementById('div1'));
ReactDOM.render(<Box />, document.getElementById('div2'));
ReactDOM.render(<Box />, document.getElementById('div3'));

and in your css, delete the styles you have and put this

.box {
  width: 200px;
  height: 200px;
  border: 1px solid black;
  float: left;
}

You have to style the actual div you are calling onClick on. Give the div a className and then style it. Also remember to remove this block where you are rendering App into the dom, App is not defined

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

Answer 2

For future googlers (thousands have now googled this question) :

To set your mind at ease, the onClick event does work with divs in react, so double-check your code syntax.

These are right:

<div onClick={doThis}>
<div onClick={() => doThis()}>

These are wrong:

<div onClick={doThis()}>
<div onClick={() => doThis}>

(and don't forget to close your tags... Watch for this:

<div onClick={doThis}

missing closing tag on the div)

Answer 3

Your box doesn't have a size. If you set the width and height, it works just fine:

 var Box = React.createClass({ getInitialState: function() { return { color: 'black' }; }, changeColor: function() { var newColor = this.state.color == 'white' ? 'black' : 'white'; this.setState({ color: newColor }); }, render: function() { return ( <div> <div style = {{ background: this.state.color, width: 100, height: 100 }} onClick = {this.changeColor} > </div> </div> ); } }); ReactDOM.render( <Box />, document.getElementById('box') );

 <script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react.min.js"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react-dom.min.js"></script> <div id='box'></div>

Answer 4

The Following code works now !!!

const test = () => {
const onClick = () => console.log('hi');

return (
<div onClick={onClick} aria-hidden="true">
  Content here
</div>
)};

Answer 5

虽然这可以通过 react 来完成，但请注意，将 onClicks 与 div（而不是按钮或锚点，以及其他已经具有点击事件行为的）一起使用是不好的做法，应该尽可能避免。

Answer 6

I just needed a simple testing button for react.js. Here is what I did and it worked.

function Testing(){
 var f=function testing(){
         console.log("Testing Mode activated");
         UserData.authenticated=true;
         UserData.userId='123';
       };
 console.log("Testing Mode");

 return (<div><button onClick={f}>testing</button></div>);
}

Answer 7

This also works:

I just changed with this.state.color==='white'?'black':'white' .

You can also pick the color from drop-down values and update in place of 'black';

( CodePen )