How to inject JavaScript in WebView React Native

Question

I have different types of scripts that need to be executed through WebView in the app. I followed many other related posts, but those didn't help me much. The first one is executing fine.

setTimeout(function() {
 window.ReactNativeWebView.postMessage(JSON.stringify(${window.CartVue.carts}))
}, 2000);true;

For the second one, can someone help me execute the below JavaScript code in WebView?

async function extractItems(){
   const responsePromise = await fetch('https://www2.hm.com/tr_tr/v1/carts',
  {
    credentials: 'include'});
    const response = await responsePromise.json();
    return response;
  }
  await extractItems();

WebView

<WebView
  ref={webViewRef}
  source={{uri: webUrl}}
  onNavigationStateChange={webViewState => {
    // setWebUrl(webViewState?.url);
  }}
  javaScriptEnabled={true}
  domStorageEnabled={true}
  startInLoadingState={true}
  injectedJavaScript={jsCode}
  onLoadEnd={() => onLoadWebUrl()}
  renderLoading={() => <Loading visible />}
  onError={() => webViewRef.current.reload()}
  onMessage={event => {
    console.log("onMessage event ==> ",);
    if (cartUrl !== '') {
      onMessage(event);
    }
  }}
/>

Adeel Iftikhar · Accepted Answer · 2021-11-15 07:28:25Z

3

After struggling I found the solution for second script. I am using below piece of code for second script to run. Hope it may help others.

  const jsCode = `setTimeout(() => {
    const extractCart = async () => {
      async function extractItems() {
        const responsePromise = await fetch('https://www2.hm.com/tr_tr/v1/carts', {
          credentials: 'include',
        });
        const response = await responsePromise.json();
        return response;
      }
      const res =  await extractItems();
      window.ReactNativeWebView.postMessage(JSON.stringify(res));
    };
    extractCart();
  }, 2000);`;

answered Nov 15, 2021 at 7:28

Adeel Iftikhar

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