Open a WebView after a button pressed with reactNative - react-native

Question

I am developing a mobile app with React Native. I want to open a WebView after a button pressed. Here is my code, but its not working. The button onPress method is not working.
import React, { Component } from 'react';
import { View, StyleSheet, Button, WebView } from 'react-native';
import { Constants } from 'expo';
export default class webView extends Component {
onNavigationStateChange = navState => {
if (navState.url.indexOf('https://www.google.com') === 0) {
const regex = /#access_token=(.+)/;
const accessToken = navState.url.match(regex)[1];
console.log(accessToken);
}
};
renderContent() {
return (
<WebView
source={{
uri: '',
}}
onNavigationStateChange={this.onNavigationStateChange}
startInLoadingState
scalesPageToFit
javaScriptEnabled
style={{ flex: 1 }}
/>
);
}
render() {
return (
<View style={styles.container}>
<Button
style={styles.paragraph}
title="Login"
onPress={() => this.renderContent()}
/>
</View>
);
}
}
const styles = StyleSheet.create({
container: {
flex: 1,
alignItems: 'center',
justifyContent: 'center',
paddingTop: Constants.statusBarHeight,
backgroundColor: '#ecf0f1',
},
});
I tried onPress={this.renderContent()} this also, but it give an exception. What can I do ?

Answer 1

You aren't rendering your WebView in the the render() method of the Component. Just think of render as your DOM of the webpage. You need to provide the component a place in the render component, than you can remove it or add it, see i am calling the renderContent from the render method. So whenever the state variable showWebView is true it will render the WebView You should do something like this:
import React, { Component } from 'react';
import { View, StyleSheet, Button, WebView } from 'react-native';
import { Constants } from 'expo';
export default class webView extends Component {
state={
showWebView: false
}
onNavigationStateChange = navState => {
if (navState.url.indexOf('https://www.google.com') === 0) {
const regex = /#access_token=(.+)/;
const accessToken = navState.url.match(regex)[1];
console.log(accessToken);
}
};
renderContent() {
return (
<WebView
source={{
uri: '',
}}
onNavigationStateChange={this.onNavigationStateChange}
startInLoadingState
scalesPageToFit
javaScriptEnabled
style={{ flex: 1 }}
/>
);
}
render() {
return (
<View style={styles.container}>
{ this.state.showWebView && this.renderContent() }
<Button
style={styles.paragraph}
title="Login"
onPress={() => this.setState({showWebView: true})}
/>
</View>
);
}
}
const styles = StyleSheet.create({
container: {
flex: 1,
alignItems: 'center',
justifyContent: 'center',
paddingTop: Constants.statusBarHeight,
backgroundColor: '#ecf0f1',
},
});

Answer 2

I think you must import the following
import { WebView } from 'react-native-webview'
instead of
'react'