This is a step by step tutorial on how to implement Angular 5 CRUD Operations with Firebase project. So let’s demonstrate Create Read Update and Delete Operations in an Angular 5 project. In one of my other article we discussed on CRUD Operations in Angular 5 with Web API.
Application Demo :
Following tools and modules are used for this project :
– Angular CLI
– Angular 5
– Firebase project
– Firebase and AngularFire2 (npm packages)
– ngx-Toastr (npm package)
– Bootstrap and Font-Awesome Icons
– VS Code Editor
we assume that you have installed required packages and software for angular 5 development.
Create Angular 5 Application
In-order to create an Angular 5 application, you can use following Angular CLI command
it will create an angular 5 application in the current directory and install some default npm packages.
To run this application
it will open this project in your default web browser from 4200 port.
Create Firebase Project
Goto Firebase Console. it will automatically log in with your gmail account.
Click On Add Project. it will open a pop-up window, inside that name your project, then click on Add Project button.After creating firebase project, Project Dashboard / Project Overview will be opened like this.
Click on ‘Add Firebase to your web app’, it will open another popup window with firebase project configuration. copy config object from there.
then past inside environment.ts file as firebaseConfig.
Change FirebaseDB Permission
Goto Database > Rules Tab (if not showing click on ‘get started’)
Set following read & write permission
Install Firebase & Angularfire2 Modules
Firebase and Angularfire2 are official packages to interact with firebase project from angular applications.
In-order to install these packages use following npm commands
Open appmodule.ts file, then initialize firebase module with firebase project configuration.
Add Required Angular 5 CRUD Components, Model and Service Classes
Now we need to add 3 components, to add angular components you can use following Angular-CLI commands
remaining two components will be child components for this employees component.
Open app.module.ts file, Add newly added components into declarations array.
Let’s Start the Design
We’ll use Bootstrap and Font-Awesome Icons For Application Design. So first of all add CDN reference for the style sheets inside index.html .
Update app.component.html as follows
Add Following to employees.component.html file.
We need Model and Services to design remaining child components.
Create Service and Model Classes
To create these classes let’s add a new folder with name shared inside employees folder (/src/app/employees/ ).
Now create employee model class
In this application, we deals with employee details like
- Full Name
- Office Location
So let’s add properties corresponding to these employee’s details inside employee.model.ts file.
$key is used to store unique key automatically generated by firebase DB when we insert a new record.
Inside the service file we will do Firebase CRUD Operation as follows
EmployeeService contains selectedEmployee property of the type employee model class Employee, to store currently active employee details. employeeList variable store all the employee records from Firebase DB.
In-order to interact with firebase project we have injected AngularFireDatabase as firebase. getData function initialize employeeList from firebase node ’employees’. we will store employee records under this node. rest of the functions are self explanatory.
Using selectedEmployee property we can design form for insert and update operation inside employee component,
In-order to list inserted employees we can use employeeList property in employee-list component. So first of all we have to Inject this service class inside child components. Before that we have to discuss our application structure.
This our application structure, component employees will be the parent component for employee and employee-list component.
We are going to inject EmployeeService inside the Parent Component Employees. and there by we can access the same injected service instance from child components Employee and Employee-List. so whenever we make make changes in one child component same change can be seen from other child component also.
Inject Employee Service in Components :
first of all inject the service class inside parent component Employees
To inject a class inside a component , mention the class inside component providers array and then create private parameter inside component constructor.
Now we can use this injected instance in child components, for that you can do this, Inside employee.component.ts file
Inside employee-list.component.ts file
Angular 5 CRUD Operations Form
We’ll create an employee form to implement Insert and Update Operation with employee Component. For that, let’s create a Template Driven Form(TDF) using selectedEmployee property from injected EmployeeService Class.
So first of all we have to import FormsModule in appmodule.ts file.
You can use following html in employee.component.html file.
and this employee form with data looks like this
This form is a collection of label – text box pair with Submit and Reset button. We have an extra hidden field to store $key of current employee. Same form is used for Insert and Update Operation.
required attribute is set to name text box, so employee name is mandatory to submit this form. When name text-box is invalid, ng-invalid and ng-dirty classes are added to it. So based on these we have implemented form validation.
when name is empty, employee form as whole is not valid so we add conditional disable attribute to Submit Button.
to show validation error indication we’ll show red border around the text box using CSS. Here is the complete css rules for this application
Insert, Update and Reset Operation
Inside employee.component.ts file we’ll write code for Insert and Update Operation. Before that I’m going to install ngx-toastr from npm package, this package helps us to show notification message inside angular applications.
In-order to install the package, you can use following npm command.
then add ToastrModule inside app.module.ts file.
Open .angular-cli.json, then update styles array.
Now you can add following code inside employee component.
restForm() function is used reset form controls value to initial stage, we called this function from reset button click event and from ngOnint Lifecycle Hook to initialise the form.
Inside the form submit event function OnSubmit, we implement both insert and update operation based on $key value. To show the success message, we use ToastrService class object tostr.
List Inserted Records and Delete Operation
Using employee-list component, we’ll list all inserted employees and then implement Delete Operation.
you can add following inside employee-list component.
Inside this we have injected EmployeeService and ToastrService Classes. Also we created an Employee array employeeList. Inside the ngOnint Lifecycle Hook, we subscribe to firebase db collection and we store employee records inside an array. Using this array variable, we will display inserted employees inside employee-list component.
employee-list.component.html looks like this.
Component design will look like this
when we click on pencil button, it will call onEdit() function to populate the corresponding record inside the employee form, after changing user’s details,he can update record as we discussed before(inside employee component).Using trash icon we implemented delete operation with onDelete() function.
Download Project Source Code : https://goo.gl/83tyjH
Step by Step Video Tutorial
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