How to use onClick with divs in React.js

问题

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

回答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'));

回答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)

回答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>

回答4:

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>);
}

回答5:

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)

回答6:

Whilst this can be done with react, be aware that using onClicks with divs (instead of Buttons or Anchors, and others which already have behaviours for click events) is bad practice and should be avoided whenever it can be.

来源：https://stackoverflow.com/questions/40535444/how-to-use-onclick-with-divs-in-react-js