Session in JavaScript

Question

I am trying to store the logged in user as a session in react native. Here is the code where I check for the login credential:

login = () => {
    // code to retrieve from firebase
    query.once( 'value', data => {
        data.forEach(userSnapshot => {
          let userKey = userSnapshot.key;
          var accountData = userSnapshot.val();
          var password = accountData.password;

          if(passwordInput != password){
            console.log('invalid credential.');
          }else{
            console.log('successful logged in.');
            // store the userKey as session to be used in other pages
          }
        });
    });
  }

I managed to grab the unique push ID for user if successfully logged in. Any idea on how to store it as a session?

Thanks in advance

Jeffrey · Accepted Answer · 2017-07-20 09:17:27Z

1

You can use AsyncStorage to store your data. Here is some example

Persisting data

try {
  await AsyncStorage.setItem('Key', 'I like to save it.');
} catch (error) {
  // Error saving data
}

Fetching data:

try {
  const value = await AsyncStorage.getItem('Key');
  if (value !== null){
    // We have data!!
    console.log(value);
  }
} catch (error) {
  // Error retrieving data
}

Remove Data

try {
  AsyncStorage.removeItem('Key');
} catch (error) {
  // Error retrieving data
}

Clear All Data

try {
 AsyncStorage.clear();
} catch (error) {
 // Error retrieving data
}

answered Jul 20, 2017 at 9:17

Jeffrey

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5 Comments

QWERTY Over a year ago

@JeffereyRajan But the error message told me that await is a reserved word.

Jeffrey Over a year ago

if you want to use await functionality then you have to use async before starting the function example: async function fetchJSONAsync(url) { let response = await fetch(url); let body = await response.json(); return body; }

QWERTY Over a year ago

So in my case, login = async() => {} ? if I don't put the await, the code can be compiled perfectly, just that when I tried to getItem(), it returns me [object Object]

Jeffrey Over a year ago

yes like this. const login = asyn () => { try { await AsyncStorage.setItem('Key', 'I like to save it.'); } catch (error) { // Error saving data } }

QWERTY Over a year ago

I see but how do I retrieve it? Because the getItem[] is currently returning me [object Object] rather than its value

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