Question 33033 in React native Question posted in
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React Native check if the route is not null

I am getting route from react-native in one component as below:

const { route } = this.props;
const { fromPage } = route.params;

But sometimes the route is null 9perhaps it was not set when navigating), how to check if that is null before getting the value like above?

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3

Answers


  1. 0

    Should look at useNavigationState:

    useNavigationState is a hook which gives access to the navigation state of the navigator which contains the screen. It’s useful in rare cases where you want to render something based on the navigation state.

    documentation

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  2. 0

    Probably you can use a conditional statement, as I have shown below.

    const { route } = this.props;
if (route && route.params) {
  const { fromPage } = route.params;
  // use `fromPage` here
} else {
  // handle the case where `route` or `route.params` is null
}
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  3. 0

    You can write like this:

    const { fromPage } = this.route?.params || {}

    fromPage param has type as string | undefined, you can check the condition of the param before using it

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