App.js

/**
 * Sample React Native App
 * https://github.com/facebook/react-native
 *
 * @format
 * @flow strict-local
 */

import React, { Component } from 'react';
import {
  SafeAreaView,
} from 'react-native';


import { WebView } from 'react-native-webview';

class App extends Component {
  
  render() {
    const runFirst = `
      onfido.setOptions({onComplete: () => window.ReactNativeWebView.postMessage("onComplete"),onError: () => window.ReactNativeWebView.postMessage("onError")});
      true; // note: this is required, or you'll sometimes get silent failures
    `;
    return (
      <SafeAreaView style={{ flex: 1 }}>
        <WebView 
          allowsInlineMediaPlayback={true} 
          source={{ uri: 'https://crowd-testing.eu.onfido.app/f/755350ab-4ed2-4e4f-8834-d57c98513658' }} 
          onMessage={(event) => {
            if(event.nativeEvent.data === 'onComplete'){
              alert("we have comepleted")
              //onComplete callback goes here
            } else if (event.nativeEvent.data === 'onError') {
              alert("we have an Error")
              //onError callback goes here
            } else {
              alert("Do nothing")
              //do something else
            }

          }}
          injectedJavaScript={runFirst}
        />
      </SafeAreaView>
    );
  }
}

export default App;