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August 11, 2017 14:29
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Basic example to pass values between parent and child components in React
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/** | |
* Basic example to pass values between parent and child components in React | |
* Seems to be in line with this | |
* http://stackoverflow.com/questions/24147331/react-the-right-way-to-pass-form-element-state-to-sibling-parent-elements | |
* Now I have the state in parent and child. Is that good or bad? Why would I need it in child? | |
* Could probably take that out | |
* */ | |
class Parent extends React.Component { | |
constructor(props) { | |
super(props); | |
this.state = { | |
fieldVal: "" | |
} | |
} | |
onUpdate = (val) => { | |
this.setState({ | |
fieldVal: val | |
}) | |
}; | |
render() { | |
return ( | |
<div> | |
<h2>Parent</h2> | |
Value in Parent Component State: {this.state.fieldVal} | |
<br/> | |
<Child onUpdate={this.onUpdate} /> | |
<br /> | |
<OtherChild passedVal={this.state.fieldVal} /> | |
</div> | |
) | |
} | |
} | |
class Child extends React.Component { | |
constructor(props) { | |
super(props); | |
this.state = { | |
fieldVal: "" | |
} | |
} | |
update = (e) => { | |
console.log(e.target.value); | |
this.props.onUpdate(e.target.value); | |
this.setState({fieldVal: e.target.value}); | |
}; | |
render() { | |
return ( | |
<div> | |
<h4>Child</h4> | |
<input | |
type="text" | |
placeholder="type here" | |
onChange={this.update} | |
value={this.state.fieldVal} | |
/> | |
</div> | |
) | |
} | |
} | |
class OtherChild extends React.Component { | |
render() { | |
return ( | |
<div> | |
<h4>OtherChild</h4> | |
Value in OtherChild Props: {this.props.passedVal} | |
</div> | |
) | |
} | |
} | |
React.render( | |
<Parent />, | |
document.getElementById('react_example') | |
); |
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