This tutorial explains how to inject custom javascript in webview component in react native application.The injectedJavaScript is a custom prop of the React native Webview component. You can pass any JavaScript code ( as string ) to this prop, and React native will inject this JavaScript code into the Webview. The injected JavaScript will get executed once the Webview is finished loading.

React Native Injecting Custom JavaScript In WebView  Component :

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

import React, { Component } from "react";
import { Platform, StyleSheet, View, WebView } from "react-native";

export default class App extends Component {

  render() {
let html = `
 This is skptricks blog 
`;
let jsCode = `document.querySelector('#myContent').style.backgroundColor = '#C2DFFF'; `;

return (
View style={styles.container}>
WebView
          style={styles.webView}          
          html={html}
 injectedJavaScript={jsCode}
          javaScriptEnabledAndroid={true}
/>
View>
);
}
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    justifyContent: 'center',
},
  headerText: {
    fontSize: 20,
    textAlign: "center",
    margin: 10,
    fontWeight: "bold"
},
});

Screenshot :


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