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
This question is related to
javascript
reactjs
onclick
event-handling
state
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)
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>);
}
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)
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.
Your box doesn't have a size. If you set the width and height, it works just fine:
var Box = React.createClass({_x000D_
getInitialState: function() {_x000D_
return {_x000D_
color: 'black'_x000D_
};_x000D_
},_x000D_
_x000D_
changeColor: function() {_x000D_
var newColor = this.state.color == 'white' ? 'black' : 'white';_x000D_
this.setState({_x000D_
color: newColor_x000D_
});_x000D_
},_x000D_
_x000D_
render: function() {_x000D_
return (_x000D_
<div>_x000D_
<div_x000D_
style = {{_x000D_
background: this.state.color,_x000D_
width: 100,_x000D_
height: 100_x000D_
}}_x000D_
onClick = {this.changeColor}_x000D_
>_x000D_
</div>_x000D_
</div>_x000D_
);_x000D_
}_x000D_
});_x000D_
_x000D_
ReactDOM.render(_x000D_
<Box />,_x000D_
document.getElementById('box')_x000D_
);
_x000D_
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react.min.js"></script>_x000D_
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react-dom.min.js"></script>_x000D_
_x000D_
<div id='box'></div>
_x000D_
Source: Stackoverflow.com