How do I click my button or run my function automatically in react native?

Issue

I'm coding in react native and I want to open my button which goes to a website that is specified in my code. I want to open the website automatically by pressing the button or running my function. I tried using the useEffect thing in react native but it didn't work. Can someone show me how to do this.

My code so far is:

// Note the additional import of useEffect
import React, { useState, useEffect,  useRef  } from 'react';
import { TouchableOpacity, Button, Text, View, StyleSheet } from 'react-native';
import * as WebBrowser from 'expo-web-browser';
import Constants from 'expo-constants';

export default function App() {
  const [result, setResult] = useState(null);

  const _handlePressButtonAsync = async () => {
    let result = await WebBrowser.openBrowserAsync('https://vitech-104517.square.site/');
    setResult(result);

  };
  return (
    <View style={styles.container}>
      <Button title="Open WebBrowser" onPress={_handlePressButtonAsync} />
      <Text>{result && JSON.stringify(result)}</Text>
  
    </View>
  );
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    alignItems: 'center',
    justifyContent: 'center',
    paddingTop: Constants.statusBarHeight,
    backgroundColor: '#ecf0f1',
  },
});

Solution

You can useEffect, try this way

export default function App() {
  const [result, setResult] = useState(null);

  useEffect(() => {
    _handlePressButtonAsync();
  }, []);

  const _handlePressButtonAsync = async () => {
    let result = await WebBrowser.openBrowserAsync('https://vitech-104517.square.site/');
    setResult(result);
  };

  return (
    <View style={styles.container}>
      <Text>Website will open automatically</Text>
      <Text>{result && JSON.stringify(result)}</Text>
    </View>
  );
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    alignItems: 'center',
    justifyContent: 'center',
    paddingTop: Constants.statusBarHeight,
    backgroundColor: '#ecf0f1',
  },
});

Answered By - Łukasz D. Mastalerz