How can I send a data to webview by clicking on react native button

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I have used the componentDidMount method which sending data properly to webview but i want to send data webview when I click on particular react native button.

In this webview is displaying the local html page and in this I’m sending the data to webview and on load event in html page alert the data which sent by react native in this componentdidmount method is succesfully sending data to webview html page but when I’m trying same code in method which saying that this.input is undefined.

   export default class HtmlRender extends Component {

   //error:this.input is undefined
   sendData() {
         this.input.postMessage( data )
   }

// This Is working
 componentDidMount(){
         this.input.postMessage( data)
   }


 render(){
      return (
          <View style={styles.fullContainer}>
               <View style={styles.webviewBorder}  >

                  <WebView
                    ref={(input) => this.input = input}
                    source={{uri:'file:///android_asset/Page.html'}}
                   />
               </View>
           <View  >
                <Button  onPress={this.sendData}>
                   <Text>
                      Data
                   </Text>
               </Button>
            </View>
  </View  >

)}

Answer

you can do it with injectedJavaScript. just define your html page source in const

const htmlData = require('./page.html');

and create a method like below

injectedToHtml() {
    const myData = {planet: 'earth', galaxy: 'milkyway'};
    let injectedData = `document.getElementById('container').value = '${myData.planet+myData.galaxy}';`;
    return injectedData;
   }

and return your web view like this in your component

<WebView
    source={htmlData}
    javaScriptEnabled={true}
    injectedJavaScript={injectedToHtml()}
    style={{flex: 1}}
/>

that’s it! let me know if you still have any question.

your html file look like this..

<!DOCTYPE html>
<html>
    <head>
      <style>
          #container {
              width:100%;
              height:100vh;
              display: flex;
              align-items:center;
              justify-content: center;
          }
      </style>
    </head>
    <body>
        <div id="container"></div>
    </body>
</html>


Source: stackoverflow