In many scenarios you want to display a completely different component inside a screen, when a button or link is clicked.
Think about a navigation structure, for example.
How can you do so?
In this example I’m managing the state centralized in the App component.
import React from 'react'
const AddTripButton = (props) => {
return <button onClick={props.addTrip}>Add a trip</button>
}
export default AddTripButton
Then in the App component, handle the addTrip event by assigning it the triggerAddTripState method:
<AddTripButton addTrip={this.triggerAddTripState} />
With React hooks, first import useState:
import { useState } from 'react'
then declare a “state” variable:
const [state, setState] = useState('start')
In the JSX you show and hide different components based on this state value:
function App() {
const [state, setState] = useState('start')
triggerAddTripState = () => {
setState('add-trip')
}
return (
<div>
{state === 'start' && (
<AddTripButton addTrip={this.triggerAddTripState} />
)}
{state === 'add-trip' && <AnotherComponent />}
</div>
)
}
With class-based components, in triggerAddTripState you edit the state of the component:
class App extends Component {
constructor(props) {
super(props)
this.state = { isEmptyState: true }
}
triggerAddTripState = () => {
this.setState({
...this.state,
isEmptyState: false,
isAddTripState: true
})
}
}
See, here I create a default state, which contains isEmptyState: true. When the triggerAddTripState method is run, the state is edited so that property is set to false, and a new isAddTripState property is set to true.
Now in the JSX we can use those 2 state properties to show and hide parts of the component by using this syntax:
render() {
return (
<div>
{this.state.isEmptyState && <AddTripButton addTrip={this.triggerAddTripState} />}
{this.state.isAddTripState && <AnotherComponent />}
</div>
)
}
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