Created
April 8, 2017 17:01
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class Counter extends Component { | |
componentWillMount() { | |
let self = this; | |
class IfEven extends Component { | |
render() { | |
let {children} = this.props; | |
return !(self.props.value % 2) ? children : null; | |
} | |
} | |
class IfOdd extends Component { | |
render() { | |
let {children} = this.props; | |
return self.props.value % 2 ? children : null; | |
} | |
} | |
this.IfEven = IfEven; | |
this.IfOdd = IfOdd; | |
} | |
render() { | |
let render = this.props.children; | |
return render({IfEven: this.IfEven, IfOdd: this.IfOdd}); | |
} | |
} | |
class RunIt extends Component { | |
state = {counterVal: 0} | |
inc = () => this.setState(({counterVal}) => ({counterVal: counterVal + 1})); | |
dec = () => this.setState(({counterVal}) => ({counterVal: counterVal - 1})); | |
render() { | |
return ( | |
<div style={{margin: '30px'}}> | |
<button onClick={this.inc}>Up</button> | |
<button onClick={this.dec}>Down</button> | |
<span>Current value {this.state.counterVal}</span> | |
<Counter value={this.state.counterVal}> | |
{({IfEven, IfOdd}) => ( | |
<div> | |
<IfEven><span style={{color: 'blue'}}>Yoooooooo, the value is even</span></IfEven> | |
<IfOdd><span style={{color: 'red'}}>Yoooooooo, the value is odd</span></IfOdd> | |
</div> | |
)} | |
</Counter> | |
</div> | |
); | |
} | |
} | |
render(<RunIt />, document.getElementById('home')); |
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