Load Local HTML File or URL in React Native using react-native-webview

React Native WebView

Load Local HTML File or URL in React Native using react-native-webview is the updated and combined post of our last 2 posts Open any Website in React Native WebView and React Native Load Local HTML File in WebView.

In this example, we will use the WebView component from react-native-webview. We will make a single page where we will have 3 buttons which will load the data in WebView from different resources.

Tasks

Different tasks that you can see in this example are:

1. Loading of WebPage from URL

<WebView
  style={{flex: 1}}
  originWhitelist={['*']}
  source={{ uri: "https://aboutreact.com" }}
  style={{ marginTop: 20 }}
  javaScriptEnabled={true}
  domStorageEnabled={true}
/>

2. Load HTML Page from a variable with HTML String

<WebView
  style={{flex: 1}}
  originWhitelist={['*']}
  source={{ html: '<h1>Hello</h1>' }}
  style={{ marginTop: 20 }}
  javaScriptEnabled={true}
  domStorageEnabled={true}
/>

3. Load a Local HTML File

if(isAndroid){
  return (
      <WebView
        style={{flex: 1}}
        originWhitelist={['*']}
        source={{uri:'file:///android_asset/index.html'}}
        style={{ marginTop: 20 }}
        javaScriptEnabled={true}
        domStorageEnabled={true}
      />
  )
}else{
  return(
    <WebView
      style={{flex: 1}}
      originWhitelist={['*']}
      source={'./resources/index.html'}
      style={{ marginTop: 20 }}
      javaScriptEnabled={true}
      domStorageEnabled={true}
    />
  );
}

To Make a React Native App

Getting started with React Native will help you to know more about the way you can make a React Native project. We are going to use react-native init to make our React Native App. Assuming that you have node installed, you can use npm to install the react-native-cli command line utility. Open the terminal and go to the workspace and run

npm install -g react-native-cli

Run the following commands to create a new React Native project

react-native init ProjectName

If you want to start a new project with a specific React Native version, you can use the --version argument:

react-native init ProjectName --version X.XX.X

react-native init ProjectName --version react-native@next

This will make a project structure with an index file named App.js in your project directory.

Installation of Dependency

To use WebView you need to install react-native-webview dependency.
To install this dependency open the terminal and jump into your project

cd ProjectName

Run the following commands

npm install react-native-webview --save

This command will copy the dependency into your node_module directory. –save is optional, it is just to update the dependency in your package.json file.

CocoaPods Installation

After the updation of React Native 0.60, they have introduced autolinking so we do not require to link the library but need to install pods. So to install pods use

cd ios && pod install && cd ..

Project File Structure

If you want to load the HTML from the local HTML file into the WebView then you need to put them in the below-described directory.  You have to make 2 copies of the HTML file and have to put them on a different location for Android and IOS. If the directories are not there then please make the directory and then put the HTML file.

Code

Now open App.js in any code editor and replace the code with the following code

App.js

//This is an example code to Load Local HTML File or URL in React Native WebView//
import React, { Component } from "react";
import { StyleSheet, Text, View, Button,Platform } from "react-native";
import { WebView } from "react-native-webview";
import HTML_FILE from "./resources/index.html";
const isAndroid= Platform.OS==='android';
type Props = {};
export default class App extends Component<Props> {
  constructor(props) {
    super(props);
    this.state = { val: 1 };
  }
  renderElement() {
    if (this.state.val === 1) {
      return (
        <WebView
          style={{flex: 1}}
          originWhitelist={['*']}
          source={{ uri: "https://aboutreact.com" }}
          style={{ marginTop: 20 }}
          javaScriptEnabled={true}
          domStorageEnabled={true}
        />
      );
    } else if (this.state.val === 2) {
      return (
        <WebView
          style={{flex: 1}}
          originWhitelist={['*']}
          source={{ html: '<h1>Hello</h1>' }}
          style={{ marginTop: 20 }}
          javaScriptEnabled={true}
          domStorageEnabled={true}
        />
      );
    } else {
      if(isAndroid){
        return (
            <WebView
              style={{flex: 1}}
              originWhitelist={['*']}
              source={{uri:'file:///android_asset/index.html'}}
              style={{ marginTop: 20 }}
              javaScriptEnabled={true}
              domStorageEnabled={true}
            />
        )
      }else{
        return(
          <WebView
            style={{flex: 1}}
            originWhitelist={['*']}
            source={HTML_FILE}
            style={{ marginTop: 20 }}
            javaScriptEnabled={true}
            domStorageEnabled={true}
          />
        );
      }
    }
  }
  render() {
    return (
      <View style={{flex: 1, marginTop:30, backgroundColor:'white'}}>
        <Button title="Load from URL" onPress={() => this.setState({ val: 1 })}/>
        <Button title="Load HTML Text" onPress={() => this.setState({ val: 2 })}/>
        <Button title="Load from Local HTML FIle" onPress={() => this.setState({ val: 3 })}/>
        <View style={{flex: 1}}>
          {this.renderElement()}
        </View>
      </View>
    );
  }
}

To Run the React Native App

Open the terminal again and jump into your project using.

cd ProjectName

To run the project on an Android Virtual Device or on real debugging device

react-native run-android

or on the iOS Simulator by running

react-native run-ios (macOS only).

Output Screenshots

IOS

      

Android

      

This is how you can Load Local HTML File or URL in React Native using react-native-webview. If you have any doubts or you want to share something about the topic you can comment below or contact us here. There will be more posts coming soon. Stay tuned!

Hope you liked it. 🙂