Is there a way to asynchronously set a value in local storage while using an ionic app to validate token-based authentication? Currently, it is taking some time to store the token in local storage before moving on to the next state.
window.localStorage.setItem('ChemistloggedInUser', JSON.stringify(data))
localStorage operates synchronously. To introduce an asynchronous behavior, you can utilize the Promise object to defer the execution of the setItem method:
const asyncLocalStorage = {
setItem(key, value) {
return Promise.resolve().then(function () {
localStorage.setItem(key, value);
});
},
getItem(key) {
return Promise.resolve().then(function () {
return localStorage.getItem(key);
});
}
};
// Example
const data = Date.now() % 1000;
asyncLocalStorage.setItem('mykey', data).then(function () {
return asyncLocalStorage.getItem('mykey');
}).then(function (value) {
console.log('Value has been set to:', value);
});
console.log('waiting for value to become ' + data +
'. Current value: ', localStorage.getItem('mykey'));
(You can also use queueMicrotask instead of Promise.resolve().then. It achieves the same outcome without creating or returning a promise, so you cannot chain a then call).
With the newer async/await syntax, the asyncLocalStorage can be defined as:
const asyncLocalStorage = {
async setItem(key, value) {
await null;
return localStorage.setItem(key, value);
},
async getItem(key) {
await null;
return localStorage.getItem(key);
}
};
It's important to note that while the above approach allows you to proceed with other code immediately, the local storage access will still occur on the same thread after the call stack is empty. This means it doesn't run in the background in parallel with your JavaScript code, but simply delays the task. Keep in mind that it may still block the GUI as it processes the job.
If you require parallel access, consider alternatives like the IndexedDB API:
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