44 lines
1.5 KiB
Markdown
44 lines
1.5 KiB
Markdown
|
---
|
||
|
|
title: Pass a Callback as Props
|
||
|
|
---
|
||
|
|
## Pass a Callback as Props
|
||
|
|
|
||
|
|
<!-- The article goes here, in GitHub-flavored Markdown. Feel free to add YouTube videos, images, and CodePen/JSBin embeds -->
|
||
|
|
### Description
|
||
|
|
- Add the `GetInput` component to the render method in MyApp, then pass it a prop called `inpu`t assigned to `inputValue` from MyApp's state. Also create a prop called `handleChange` and pass the input handler `handleChange` to it.
|
||
|
|
- Add `RenderInput` to the render method in MyApp, then create a prop called `input` and pass the `inputValue` from state to it.
|
||
|
|
|
||
|
|
### Hints
|
||
|
|
- `state` is a property of `Myapp` class, so use 'this.state' to get the object value
|
||
|
|
- To learn more about state and props, read [State and Lifecycle](https://reactjs.org/docs/state-and-lifecycle.html) and [Components and Props](https://reactjs.org/docs/components-and-props.html).
|
||
|
|
|
||
|
|
### Solution
|
||
|
|
```javascript
|
||
|
|
class MyApp extends React.Component {
|
||
|
|
constructor(props) {
|
||
|
|
super(props);
|
||
|
|
this.state = {
|
||
|
|
inputValue: ''
|
||
|
|
}
|
||
|
|
this.handleChange = this.handleChange.bind(this);
|
||
|
|
}
|
||
|
|
handleChange(event) {
|
||
|
|
this.setState({
|
||
|
|
inputValue: event.target.value
|
||
|
|
});
|
||
|
|
}
|
||
|
|
render() {
|
||
|
|
return (
|
||
|
|
<div>
|
||
|
|
{ /* change code below this line */
|
||
|
|
<GetInput input={this.state.inputValue} handleChange={this.handleChange}/>
|
||
|
|
}
|
||
|
|
{ /* change code above this line */
|
||
|
|
<RenderInput input={this.state.inputValue}/>
|
||
|
|
}
|
||
|
|
</div>
|
||
|
|
);
|
||
|
|
}
|
||
|
|
};
|
||
|
|
```
|