User Admin Angular App

In This project we will build step by step a User Admin angular application.

Step 1 - Create a new project

• install the angular cli on your machine BEFORE YOU INSTALL: please read the prerequisites

  npm install -g @angular/cli

• Create a new angular project named "user-admin"

    ng new user-admin
    cd user-admin

• Run the new project with ng serve and Navigate to http://localhost:4200/. The app will automatically reload if you change any of the source files.

Step 2 - Modules And Components

• under the src/app directory create a new directory users
• Create a new component user-container.component inside the above directory.
• To Create a component create a user-container directory with 3 files inside it:
  • user-container.component.ts
  • user-container.component.html
  • user-container.component.css
• the Component should display a simple element displaying static user information.

    <div class="user-item">
      <div>
        id:1
      </div>
      <div>
        username:johndoe
      </div>
      <div>
        email:[email protected]
      </div>
    </div>

• inside the .css file Add a css rule for the class user-item to style the component as you wish.
• implement the OnInit lifecycle hook by implementing OnInit interface and implementing a ngOnInit method inside the component's class. the method should print to console User Container Init.
• Add the component to the app.module and to the app.component template.

Step 3 - Data binding

• Under the the app folder create a new folder models
• inside the folder create a new UserModel class with the following scheme

    {
      "id": 0,
      "username": "john_d",
      "email": "[email protected]",
      "info": {
        "firstName": "john",
        "lastName": "doe",
        "jobTitle": "Developer",
        "avatar": "http://authenticgoods.co/wrapbootstrap/themes/sparks/img/team/avatar-male.png",
        "phoneNumber": "01-234-343434"
      }
    }

• inside the user-container.component add a currentUser property of type 'UserModel' and instantiate it with random data inside the ngOnInit hook.
• replace the template you created in step 2 to display data bound info from the currentUser property.
• Add A simple form to the user-container.component with 2 text fields for the user name and email, and a Save button.
• The input fields should also use data binding to display the currentUser fields, allowing us to edit the fields.
• Clicking the save button should update the currentUser property and that should automatically update all the currentUser data across the template.

Step 4 - Directives

• inside the user-container.component add a users property of type Array<UserModel>instantiate it inside the ngOnInit hook with an array containing random users.
• remove the instantiation of the currentUser.
• use the *ngFor directive to loop over the users array and render the user element for every item in the array.
• For every item add a click event that will set the currentUser to the user item that was clicked.
• The edit form should display only when there is a currentUser selected (use *ngIf).
• When an item is clicked it should be displayed with a colored background (use [ngClass]).

Step 5 - Composition

• break the user-container.component into 2 seperate components.
  • user-list.component handling the user list.
  • user-edit.component handling the user edit form.
• The new component should not handle data but only recieve it as inputs and emit events as outputs.
• The data will be passed from the user-container.component.
• Create a users.module module and declare the 3 components inside it.
• remove declaration user-container.component from app.module and add the user.module module as an import.

Step 6 - Services

• create a new users.service class with 3 methods getUsers,updateUser,deleteUser.
• Add the appropriate provider to the users.module.
• move the users property and it's instantiation from the user-container-component into the service.
• now for the user-container should use the injected service to get the users list and updating the user inside.
• inside the user-edit.component add a delete button that allows you to delete a user.
• the delete button should emit a delete click event that should be handled inside the user-container.component which in turn should invoke the delete method on the service.

Step 7 - Http

Http Server

• Before starting to work with the http client we would require server.
• to run the server, open another terminal window and go to the server folder.
• inside the server folder run:

    npm install
    
    npm start

• now we have restful api running on port 3000
• the server follows restful practices, so for the users resource we will be using the following endpoints

  Get All users - GET http://localhost:3000/users
  Get Specific User - GET http://localhost:3000/users/{id}
  Create user - POST http://localhost:3000/users
  Update user - PUT http://localhost:3000/users/{id}
  Delete user - DELETE http://localhost:3000/users/{id}

Client

• Refactor the user service from the Previous Step to work with Angular's Http client.
• The 3 methods getUsers,updateUser,deleteUser should now use the Http client to call the appropriate api endpoint as detailed above.
• Remember that now the methods are async and should return an Observable that should be subscribed to.

Step 8 - Routing

• Create a new app.routing module the will hold the main root route. -the main route should basically should be a redirect route from the root path to /users.
• Create a new users.routing that will hold the routes for the users views.
• Create 2 new routes
  • /users - will display the list, mapped to the users-container.component
  • /users/{id} - will display the user view containing the user edit form mappaed to the user-edit-container.component.
• Update the components code so that when clicking on a user inside the list we will be recirected to the user edit route.
• in the user edit view clicking on save should now redirect back to the list when saving is finished and clicking on cancel just redirects back to the users list view.

Step 9 - Pipes

• Create a new Pipe named ellipsis.pipe.
• The ellipsis.pipe should to text ellipsis on the input value. And should receive a count parameter for how many characters are allowed.
• Use the ellpisis.pipe in the user items inside the users list.
• Change The users-container.component users list bindings to an observable and use the async pipe on the input binding of the user-list.component.

Step 10 - Forms

• Create a new route:
  • /users/new will display a user form for creating a new user.
• The Form should contain the following user fields:
  • Username - required, minimum 4 characters
  • Email - required, should be a valid email address.
  • First Name
  • Last Name
  • avatar url
• Choose whether to implement this via a Template or Model driven approach.
• Create a new method createUser inside the user.service service.
• the new method should call the Create user endpoint.
• Implement the Form's submit method so that it calls the new user.service method and upon a successful request navigate back to the user list view.