---
sidebar_position: 2
title: User Login Function
slug: RnOw-user-login-function
createdAt: Fri Jul 19 2024 03:45:40 GMT+0000 (Coordinated Universal Time)
updatedAt: Fri Jul 19 2024 03:56:00 GMT+0000 (Coordinated Universal Time)
---

# User Login Function

This documentation provides a detailed explanation of the `login` function, which handles user login in an asynchronous manner, including checks for user authentication, showing loading indicators, and emitting events upon successful login.

## Function: `login`

### Description

The `login` function is designed to check if a user is logged in, and if not, it will attempt to log the user in by repeatedly checking for owned users. It uses asynchronous operations to ensure the login process is smooth and non-blocking.

### Code

```javascript
async function login() {
	try {
		let user = new User();
		let temp = await user.islogin();
		if (!temp) {
			
			for (let i = 0; i < 5; i++) {
				let result = await user.getOwnedUsers();
				let userid = result && result._userIds && result._userIds.length && result._userIds[0];
				if (userid && userid.length) {
					break;
				}
				await sleep(300);
			}

			temp = await user.islogin();
			if (!temp) {
				console.log("login failed, please try again later");
				return;
			}
		}
	} catch (error) {
		console.log("index demo error", error);
		if (error && typeof error == 'string') {
			console.log(error);
		} else {
			console.log(error.message);
		}
	}
}
```

### Detailed Explanation

1. **User Object and Initial Login Check:**
   - Creates a new `User` object.
   - Checks if the user is already logged in by calling `user.islogin()` and logs the result.
2. **Repeated Attempts to Get Owned Users:**
   - Attempts to get the list of owned users up to 5 times, with a 300ms delay between each attempt.
   - Breaks the loop if a valid user ID is found.
3. **Error Handling:**
   - Catches any errors that occur during the login process.
   - Logs the error to the console.
   - Closes the toast and shows an appropriate error message to the user.


This setup ensures that the user login status is checked and handled as soon as the component is ready, providing a seamless experience for the user.
