Error evaluating injectedJavaScript: This is possibly due to an unsupported return type. Try adding true to the end of your injectedJavaScript string.

Hello,

We’re trying to migrate from react-native WebView. Replacing import { WebView } from 'react-native' with import { WebView } from 'react-native-webview' gives us this error when the component is mounted:

Error evaluating injectedJavaScript: This is possibly due to an unsupported return type. Try adding true to the end of your injectedJavaScript string.

I’ve tried to add ; true or ; return true at the end of the injected script but we still get the same error.

Do you know how we can fix it or identify the underlying problem?

Issue Analytics

State:
Created 5 years ago
Reactions:22
Comments:30 (1 by maintainers)

Top GitHub Comments

104reactions

sillysachincommented, Feb 23, 2019

Fixed using a timer.

const jsCode = `
    setTimeout(() => {
        document.getElementById("name").value = "${name}"; 
        document.f1.submit(); 
    }, 100);
`;

58reactions

legion-zvercommented, Feb 18, 2019

See your JS code carefully, this error is due to the fact that WebView can not execute JS code!

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