Mini library to help you easily integrate existing web library into React Native!
npm install --save react-native-html5-loader
This is indeed a mini library, but it offers some good stuff to you:
- Create base HTML template inside Webview, let you easily inject the part you need for customization
- Hook up basic communication channel between the WebView and React Native using the
postMessage. The message format is redux like:typeandpayload, so you won't need to manually stringify or parse anything youself. - Handle WebView initialization to
avoid the possible race condition between WebView and React Native, since there're running in their own JS runtime - You can
write JS function for web directly in your React Native project(NOTICE: es5 syntax only)
Please see examples directory, we have provided 3 examples for now:
- A simple
Counterexample - An example to integrate
SignaturePadjs library - An example to integrate
ThreeJsto show 3D object
Let's use a simple Counter example to explain the usage.
What we want to accomplish is:
- Create the counter UI inside
WebView - Increment or decrement the counter value in
React Nativeside.
The full code is here, very short and clean:
import React, {Component} from 'react';
import {View, Text, TouchableOpacity, WebView} from 'react-native';
import Html5Loader from 'react-native-html5-loader';
export default class App extends Component {
render() {
return (
<Html5Loader
head={`
<style>
body { margin:0; padding: 20px; }
h1 { font-size: 100px; }
</style>
`}
body={`
<h1>0</h1>
`}
webHandler={function webHandler(action, callRN, window) {
var count = parseInt(window.document.querySelector('h1').innerHTML, 10);
if (action.type === 'inc') {
window.document.querySelector('h1').innerHTML = (count + 1);
} else if (action.type === 'dec') {
window.document.querySelector('h1').innerHTML = (count - 1);
}
callRN('ack', 'message ' + action.type + ' received')
}}
rnHandler={(action, callWeb) => console.log(action.type, action.payload)}
>
{({callWeb, webViewProps}) => (
<View style={{flex: 1}}>
<WebView
{...webViewProps}
style={{flex: 1, alignSelf: 'stretch'}}
/>
<View style={{flexDirection: 'row', height: 60, justifyContent: 'space-around'}}>
<TouchableOpacity onPress={() => callWeb('inc', null)}>
<Text>+1</Text>
</TouchableOpacity>
<TouchableOpacity onPress={() => callWeb('dec', null)}>
<Text>-1</Text>
</TouchableOpacity>
</View>
</View>
)}
</Html5Loader>
);
}
}- head (
string): will be injected into the<head>section of WebView HTML. - body (
string): will be injected into the<body>section of WebView HTML. - webHandler (
es5 function): the code to execute inside Web when receiving message from React Native side. The signature:- action: JS object with format
{type, payload} - callRN: used to send message back to React Native side.
callRNalso has two positional paramstype(string) andpayload(any) - window: injected global
windowobject for WebView.
- action: JS object with format
- rnHandler (
function): the code to execute inside RN when receiving message from Web side. The signature:- action: JS object with format
{type, payload} - callWeb: used to send message to web side.
callWebalso has two positional paramstype(string) andpayload(any)
- action: JS object with format
This library uses render props pattern and the props.children should be a function returning JSX, with a single param which is an object containing following properties:
- callWeb: used to send message to web side.
callWebalso has two positional paramstype(string) andpayload(any) - webViewProps: calculated props for the actual
WebView, use spread operator to pass those props to let the magic happen!
Welcome!