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Randell Dawson 1494a50123 fix(guide): restructure curriculum guide articles (#36501)
* fix: restructure certifications guide articles
* fix: added 3 dashes line before prob expl
* fix: added 3 dashes line before hints
* fix: added 3 dashes line before solutions
2019-07-24 13:29:27 +05:30

75 lines
1.4 KiB
Markdown

---
title: Use State to Toggle an Element
---
# Use State to Toggle an Element
---
## Problem Explanation
You can toggle an element by checking and changing its state.
---
## Hints
### Hint 1
- Remember to bind ```this``` to the method constructor.
```javascript
this.toggleVisibility = this.toggleVisibility.bind(this);
```
### Hint 2
- Remember, you can use a JavaScript function to check for the state of an element.
---
## Solutions
<details><summary>Solution 1 (Click to Show/Hide)</summary>
```jsx
class MyComponent extends React.Component {
constructor(props) {
super(props);
this.state = {
visibility: false
};
// change code below this line
this.toggleVisibility = this.toggleVisibility.bind(this);
// change code above this line
}
// change code below this line
toggleVisibility() {
if (this.state.visibility == true) {
this.setState({
visibility: false
});} else {
this.setState({
visibility: true
})
}
}
// change code above this line
render() {
if (this.state.visibility) {
return (
<div>
<button onClick={this.toggleVisibility}>Click Me</button>
<h1>Now you see me!</h1>
</div>
);
} else {
return (
<div>
<button onClick={this.toggleVisibility}>Click Me</button>
</div>
);
}
}
};
```
</details>