React native 'Cannot read property of undefined' AsyncStorage

Question

I try to load the ID from a ble device via AsyncStorage that I save in a another component. But then I do this I get the following error:

ExceptionsManager.js:65 Cannot read property 'loadMac' of undefined

This is my loadMac() function:

   export function loadMac() {
  AsyncStorage.getItem(MAC_KEY)
    .then((item) => {
      console.log(item);
      return item;
    })
    .catch((error) => {
      console.log(error);
    });
}

And I call this function in my component like this:

store.loadMac();

Then I try

AsyncStorage.getItem(MAC_KEY)
  .then((item) => {
      console.log(item)});

I will get my ID.. but not from my function that I have in another file.

Any solution ?

store is not defined when you are calling store.loadMac(); — Matt Aft
– Matt Aft, Commented Sep 8, 2017 at 0:51
you've not shown how store would be possibly defined as anything — Jaromanda X
– Jaromanda X, Commented Sep 8, 2017 at 1:04
What is store? Did you import the function as store? If you imported the loadMac module as store, you just call store() — Brr Switch
– Brr Switch, Commented Sep 8, 2017 at 1:27
This is how I import my store => const store = require('../../api/store'); EDIT: Ok sorry I forget this import in my other component <.< — developKinberg
– developKinberg, Commented Sep 8, 2017 at 2:11

soutot · Accepted Answer · 2017-09-08 01:35:45Z

2

The error message says store is not defined, so you should look for a solution checking it. By the code you posted I am assuming you've tried to have 2 different components: one stateless component named 'store' which you are exporting to access its' loadMac function. And another where you are importing the 'store' component. Correct me if I'm wrong. If this is the case, your export syntax is incorrect. It should be something similar to this

export default const Store = () => {...}

And then import it like this:

import Store from './yourPathToStore';

If it's not, then you shouldn't have that export and also clarify what is exactly your 'store'.

Hope it helps.

answered Sep 8, 2017 at 1:35

soutot

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1 Comment

developKinberg Over a year ago

Jeah you right, I forget the import, had this only in one component <.<

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