继续旅程:使用AngularJS和Firebase从头构建Web应用程序:第2部分。

In the first part of this Series. we delved into starting an application with AngularJS and Firebase, creating a login page and utilizing Firebase as the backend for user authentication. Now, let’s elevate our series to the next level. In this tutorial, we’ll create and set up a registration page and explore form validation in AngularJS.

To begin, clone the code from the first part of the tutorial on GitHub:
“`bash
git clone https://github.com/jay3dec/AngularJS_Firebase_Part1.git
cd AngularJS_Firebase_Part1
npm install
“`
Start the server with `npm start` and navigate to `http://localhost:8000/app/#/home` to ensure the application is running.

**Creating the Registration Screen**
First, create a registration page for guests. Inside the `AngularJS_Firebase_Part1/app` folder, make a new directory called `register`. Within the `register` folder, create two files: `register.htML` and `register.js`.

Here’s a basic structure for `register.html`:
“`html

“`
In `register.js`, declare the route for the registration view using `$routeProvider`. The `when` method will be used to create a route for the registration view, setting a template URL that will be rendered in `index.html`. AdDiTionally, we’ll set a controller for the newly created `$scope` within the registration view. Controllers govern logic specific to a view.
“`javascript
angular.module(‘myApp.register’, [])
“`
**Linking the Registration Screen**
Link the registration screen to the login screen by adding a “Register” link in both `home.html` and `register.html`. Set the `href` sources to allow access from both pages.

In `home.html`:
“`html
Register
“`
In `register.html`:
“`html
Login
“`
**Form Validation in AngularJS**
When users enter their emAIl address and password during registration, validation is necessary. First, the email ID input should have a valid format, and second, the password should have a minimum length. AngularJS provides a FormController that tracks each element within a form and its state, such as validity, dirtiness, or pristine status.

Modify the registration form in `register.html` to include validation messages:
“`html

Register

“`
Now, the validation messages will display when the email and password inputs are invalid. Use `$invalid`, `$dirty`, `$invalid`, and `$valid` properties of the FormController to implement form validation, and AngularJS directives like `ngShow` and `ngMinlength` to control the visibility of validation messages and enforce input constraints.

For example, the `ng-show` directive is used to display the validation message only when the input is invalid. The `ng-minlength` directive sets the minimum length for the password field. The `ng-disabled` directive disables the registration button until both email and password are valid.

After making these changes, restart the server and browse to the registration page to see the form validation in Action. In the upcoming sections, we’ll dive deeper into implementing registration functionality and other features. You can find the source code for this tutorial on GitHub.

Let us know your thoughts and feedback in the comments below!