because reloading the page deletes the vuex data, having used mutations, vuejs?

Question

Currently I have the following configuration in my vuex, what I do is through the userAuth action verify the user's role and assign it to a property of the state 'rol_user', using the UPDATEROL mutation. I execute this action when I log in so that the user's role is recorded in vuex.

here the vuex configuration:

import Vue from "vue";
import Vuex from "vuex";
import firebase from 'firebase';

Vue.use(Vuex);

export default new Vuex.Store({
    state: {
        rol_user: ''
    },
    mutations: {
        UPDATEROL: function (state, payload) {
            state.rol_user = payload.rol_user;
        }
    },
    actions: {
        userAuth: async (context) =>{
            let user = firebase.auth().currentUser;
            if(user){
                let user_info = await firebase.database().ref('users').child(user.uid).once('value');
                let val_user = user_info.val();
                console.log("USER AUTH - VUEX");
                console.log(val_user.rol);
                context.commit('UPDATEROL',{
                    rol_user: val_user.rol
                });
            }
        }
    }
});

It effectively assigns the user's role to the state property, rol_user. The problem I have is when reloading the page. When I reload the page rol_user returns to its initial state, that is empty. How can I do so that the value of the role is not lost even when reloading the page, but rather that it is changed to empty only until I log out

Answer 1

You need to use some sort of storage mechanism and check that storage everytime the app is first mounted. For example, you could store a session key in localStorage or just store the user state that you want to persist.

Note, I do not know what kind of data you are storing, I am assuming rol_user is an object, if it is a string, you do not need JSON serialization/deserialization as I've done in the example below:

import Vue from "vue";
import Vuex from "vuex";
import firebase from 'firebase';

Vue.use(Vuex);

export default new Vuex.Store({
    state: {
        rol_user: ''
    },
    mutations: {
        UPDATEROL: function (state, payload) {
            state.rol_user = payload.rol_user;
            localStorage && (localStorage.rol_user = JSON.stringify(state.rol_user)); 
               //^ try to store the user role in localStorage
        },

    },
    actions: {
        userAuth: async (context) =>{
            if(localStorage && localStorage.rol_user) { 
               //^ if it's in localStorage, log the user back in/update state to match what it is in localStorage
                 context.commit('UPDATEROL', { rol_user: JSON.parse(localStorage.rol_user)});
                 return;
            }
            let user = firebase.auth().currentUser;
            if(user){
                let user_info = await firebase.database().ref('users').child(user.uid).once('value');
                let val_user = user_info.val();
                console.log("USER AUTH - VUEX");
                console.log(val_user.rol);
                context.commit('UPDATEROL',{
                    rol_user: val_user.rol
                });
            }
        }
    }
});

You could also use Cookies (cookies are generally more common for this purpose, but localStorage also works just fine)