Creating a Sign Up and Log In Functionality with Netlify and JavaScript
To create a sign up page that allows users to log in, we can start by creating an async function that will handle the login functionality. We'll use this function when the user presses the "Log In" button on the sign up page.
First, let's define our sign up button with the label "Log In". We'll also add an onclick event to call our login function.
```javascript
// Define the log in button
let logInButton = document.createElement('button');
logInButton.textContent = 'Log In';
logInButton.onclick = async () => {
// Call the login function here
};
```
Next, we need to define our login function. This function will be called when the user presses the "Log In" button.
```javascript
// Define the login function
async function logIn(email, password) {
try {
const response = await fetch('/api/login', {
method: 'POST',
headers: { 'Content-Type': 'application/json' },
body: JSON.stringify({ email, password }),
});
if (!response.ok) throw new Error(`HTTP error! status: ${response.status}`);
const data = await response.json();
// Set cookies and user ID
document.cookie = `token=${data.token}; expires=${data.expires}`;
document.cookie = `user_id=${data.userId}; expires=${data.expires}`;
window.location.href = '/dashboard';
} catch (error) {
console.log(error);
}
}
```
In the login function, we use the Fetch API to send a POST request to our `/api/login` endpoint. We pass in the email and password as JSON data.
We also set the cookies for the token and user ID using the `document.cookie` property.
Finally, we redirect the user to the dashboard page.
Let's test our login function by calling it with an example email and password.
```javascript
// Test the login function
logIn('annie@example.com', '1 2 3');
```
When we call the login function, it should set the cookies and redirect us to the dashboard page.
However, we need to make sure that our code is properly handling errors. We can do this by adding a try-catch block around our fetch request.
```javascript
// Test the login function with errors
logIn('annie@example.com', 'wrongpassword').catch(error => console.log(error));
```
This will catch any errors that occur during the login process and log them to the console.
Next, we need to prevent the default behavior of the button click. We can do this by adding an event listener to the button's onclick property.
```javascript
// Prevent the default behavior
logInButton.onclick = (e) => {
e.preventDefault();
// Call the login function here
};
```
We also need to import the `useCookies` hook from our environment module.
```javascript
import { useCookies } from 'react-cookie';
```
This hook will allow us to access and modify the cookies stored on the user's browser.
Finally, let's clean up our code by formatting it and adding a DOT get ignore file to our project.
We'll also add an EnV file to our project to make sure that we can use environment variables in our code.
By following these steps, we've created a basic sign up and log in functionality using Netlify and JavaScript. This is just a starting point, and there are many ways we can improve and expand on this functionality.