67 lines
1.5 KiB
Markdown
67 lines
1.5 KiB
Markdown
|
---
|
||
|
|
title: Set State with this.setState
|
||
|
|
---
|
||
|
|
## Set State with this.setState
|
||
|
|
|
||
|
|
#### Hint 1:
|
||
|
|
```JSX
|
||
|
|
class MyComponent extends React.Component {
|
||
|
|
constructor(props) {
|
||
|
|
super(props);
|
||
|
|
this.state = {
|
||
|
|
name: 'Initial State'
|
||
|
|
};
|
||
|
|
this.handleClick = this.handleClick.bind(this);
|
||
|
|
}
|
||
|
|
handleClick() {
|
||
|
|
// change code below this line
|
||
|
|
// Update the state data by using "this.setState()" method.
|
||
|
|
// You can look to the sample inside the description for calling "setState()" method.
|
||
|
|
// change code above this line
|
||
|
|
}
|
||
|
|
render() {
|
||
|
|
return (
|
||
|
|
<div>
|
||
|
|
<button onClick={this.handleClick}>Click Me</button>
|
||
|
|
<h1>{this.state.name}</h1>
|
||
|
|
</div>
|
||
|
|
);
|
||
|
|
}
|
||
|
|
};
|
||
|
|
```
|
||
|
|
|
||
|
|
## Solution
|
||
|
|
```JSX
|
||
|
|
class MyComponent extends React.Component {
|
||
|
|
constructor(props) {
|
||
|
|
super(props);
|
||
|
|
this.state = {
|
||
|
|
name: 'Initial State'
|
||
|
|
};
|
||
|
|
this.handleClick = this.handleClick.bind(this);
|
||
|
|
}
|
||
|
|
handleClick() {
|
||
|
|
// change code below this line
|
||
|
|
this.setState({
|
||
|
|
name: 'React Rocks!'
|
||
|
|
});
|
||
|
|
// change code above this line
|
||
|
|
}
|
||
|
|
render() {
|
||
|
|
return (
|
||
|
|
<div>
|
||
|
|
<button onClick={this.handleClick}>Click Me</button>
|
||
|
|
<h1>{this.state.name}</h1>
|
||
|
|
</div>
|
||
|
|
);
|
||
|
|
}
|
||
|
|
};
|
||
|
|
```
|
||
|
|
### Code Explanation:
|
||
|
|
|
||
|
|
when users click the button the "handleClick()" method will be called and
|
||
|
|
inside this method the data of the constuctor\`s state will be updated by "setState()" method.
|
||
|
|
then h1 tag will be changed with the new data of the constructor\`s state.
|
||
|
|
|
||
|
|
|