AngularJS with MVC4 CRUD

Posted 2020-07-06 大西瓜3721

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CRUD using MVC Web API and AngularJS

In this article I am going to demonstrate about how can we create basic crud (create, read, update and delete) using MVC Web API, SQL Server and Angular JS.

In this demo application our main concern will be on Angular JS data-binding and routing. I also used a Entity Framework Code First approach for database operation.

Functionalities present in this application:

a) Data Binding using AngularJS

b) Client side routing using Angular Routing

c) Cascading Dropdown using AngularJS

d) Conditional formatting using Angularjs

e) Select, Insert, Update and Delete record in sql server database.

Let’s start step by step so that we can achieve our objective at the end of this article. After completing this demo our application should look like this:

1) Employee List page:

2) Employee Page for Create and Edit a record.

3) Employee Delete Confirmation page with details:

To achieve the above, follow the steps given below:

1) Create a new asp.net mvc empty web application.

2) Add the following package in your application:

a) AngularJS.Core

b) AngularJS.Route

c) Bootstrap

d) EntityFramework

3) Create a Model named Employee in Models folder and replace the code with the following:

public class Employee

{

public int EmployeeId { get; set; }

[Required]

[StringLength(20)]

public string FirstName { get; set; }

[Required]

[StringLength(20)]

public string LastName { get; set; }

[Required]

[StringLength(100)]

public string Description { get; set; }

public float Salary { get; set; }

[Required]

[StringLength(50)]

public string Country { get; set; }

[Required]

[StringLength(50)]

public string State { get; set; }

public DateTime DateofBirth { get; set; }

public bool IsActive { get; set; }

}

public class EmployeeDbContext : DbContext

{

public EmployeeDbContext()

: base()

{

Database.SetInitializer<EmployeeDbContext>(new EmployeeDbContextInitializer());

}

public DbSet<Employee>Employees { get; set; }

}

public class EmployeeDbContextInitializer : DropCreateDatabaseIfModelChanges<EmployeeDbContext>

{

protected override void Seed(EmployeeDbContext context)

{

var list = new List<Employee>

{

new Employee { FirstName = "Rohit", LastName = "Kesharwani", Description = "Rohit Kesharwani", DateofBirth = DateTime.Now.AddYears(-23), Country = "IN", State="UP", Salary = 99999, IsActive = true },

new Employee { FirstName = "Rahul", LastName = "Singh", Description = "Rahul Singh", DateofBirth =DateTime.Now.AddYears(-25), Country = "IN", State="MP", Salary = 49999.28f, IsActive = true }

};

list.ForEach(m =>

{

context.Employees.Add(m);

});

context.SaveChanges();

base.Seed(context);

}

4) Add a connection string with same name of EmployeeDbContext in web.config:

<addname="EmployeeDbContext"connectionString="Data Source=(local);Initial Catalog=EmpDb;Integrated Security=true;"providerName="System.Data.SqlClient"/>

</connectionStrings>

5) Now create a Employee API controller to perform crud in database:

public class EmployeeController : ApiController

{

EmployeeDbContext db = new EmployeeDbContext();

// GET api/employee

[ActionName("get"), HttpGet]

public IEnumerable<Employee>Emps()

{

return db.Employees.ToList();

}

// GET api/employee/5

public Employee Get(int id)

{

return db.Employees.Find(id);

}

// POST api/employee

public HttpResponseMessage Post(Employee model)

{

if (ModelState.IsValid)

{

db.Employees.Add(model);

db.SaveChanges();

HttpResponseMessage response = Request.CreateResponse(HttpStatusCode.Created, model);

return response;

}

else

{

return Request.CreateErrorResponse(HttpStatusCode.BadRequest, ModelState);

}

// PUT api/employee/5

public HttpResponseMessage Put(Employee model)

{

if (ModelState.IsValid)

{

db.Entry(model).State = System.Data.Entity.EntityState.Modified;

db.SaveChanges();

HttpResponseMessage response = Request.CreateResponse(HttpStatusCode.OK, model);

return response;

}

else

{

return Request.CreateErrorResponse(HttpStatusCode.BadRequest, ModelState);

}

// DELETE api/employee/5

public HttpResponseMessage Delete(int id)

{

Employee emp = db.Employees.Find(id);

if (emp == null)

{

return Request.CreateResponse(HttpStatusCode.NotFound);

}

db.Employees.Remove(emp);

db.SaveChanges();

return Request.CreateResponse(HttpStatusCode.OK, emp);

}

6) Also create a Country controller to retrieve country and its states from server side in order to implement cascading dropdown list:

public class CountryController : ApiController

{

// GET api/country

public IEnumerable<System.Web.Mvc.SelectListItem> Get()

{

List<System.Web.Mvc.SelectListItem> countries = new List<System.Web.Mvc.SelectListItem>

{

new System.Web.Mvc.SelectListItem { Text = "India", Value="IN" },

new System.Web.Mvc.SelectListItem { Text = "United States", Value="US" },

new System.Web.Mvc.SelectListItem { Text = "United Kingdom", Value="UK" },

new System.Web.Mvc.SelectListItem { Text = "Australlia", Value="CA" }

};

return countries;

}

// GET api/country/5

public IEnumerable<System.Web.Mvc.SelectListItem> Get(string id)

{

List<System.Web.Mvc.SelectListItem> states = new List<System.Web.Mvc.SelectListItem>();

switch (id)

{

case "IN":

states.Add(new System.Web.Mvc.SelectListItem { Text = "Uttar Pradesh", Value = "UP" });

states.Add(new System.Web.Mvc.SelectListItem { Text = "Madhya Pradesh", Value = "MP" });

states.Add(new System.Web.Mvc.SelectListItem { Text = "Delhi", Value = "DL" });

states.Add(new System.Web.Mvc.SelectListItem { Text = "Kanpur", Value = "KN" });

break;

case "US":

states.Add(new System.Web.Mvc.SelectListItem { Text = "California", Value = "CA" });

states.Add(new System.Web.Mvc.SelectListItem { Text = "Newyork", Value = "NY" });

break;

case "UK":

states.Add(new System.Web.Mvc.SelectListItem { Text = "London", Value = "LN" });

states.Add(new System.Web.Mvc.SelectListItem { Text = "Paris", Value = "PR" });

break;

case "CA":

states.Add(new System.Web.Mvc.SelectListItem { Text = "Sydney", Value = "SD" });

states.Add(new System.Web.Mvc.SelectListItem { Text = "Melbourne", Value = "MB" });

break;

}

return states;

}

7) Now create a Home controller and add an Index view and reference some css and JavaScript files of angularjs and bootstrap to create a view and partial views:

public class HomeController : Controller

{

public ActionResult Index()

{

return View();

}

8) Index view with js and css references:

Layout = null;

}

<!DOCTYPE html>

<head>

<title>Index</title>

</head>

<body>

</div>

</body>

</html>

I have highlighted ng-app and ng-view attribute. This is for initializing module under app and rendering of partial views inside ng-view.

9) Now create an app.js file for configuration of route and controllers. The code of app.js is given below:

var EmpApp = angular.module(‘EmpApp‘, [

‘ngRoute‘,

‘EmpControllers‘

]);

EmpApp.config([‘$routeProvider‘, function ($routeProvider) {

$routeProvider.when(‘/list‘, {

templateUrl: ‘Employee/list.html‘,

controller: ‘ListController‘

}).

when(‘/create‘, {

templateUrl: ‘Employee/edit.html‘,

controller: ‘EditController‘

}).

when(‘/edit/:id‘, {

templateUrl: ‘Employee/edit.html‘,

controller: ‘EditController‘

}).

when(‘/delete/:id‘, {

templateUrl: ‘Employee/delete.html‘,

controller: ‘DeleteController‘

}).

otherwise({

redirectTo: ‘/list‘

});

}]);

10) Now add a folder named Employee under root directory of an application and following three views (html files) list.html, edit.html and delete.html.

a) List.html

<div>

<a href="#/create" class="btn">Create</a>

</div>

<tr>

<th>Employee Id</th>

<th>First Name</th>

<th>Description</th>

<th>Salary</th>

<th>Country</th>

<th>State</th>

<th>Date of Birth</th>

<th>Is Active</th>

</tr>

<td>{{ item.EmployeeId }}</td>

<td>{{ item.FirstName }}</td>

<td>{{ item.LastName }}</td>

<td>{{ item.Description }}</td>

<td>{{ item.Salary | number: 2 }}</td>

<td>{{ item.Country }}</td>

<td>{{ item.State }}</td>

<td>{{ item.DateofBirth | date }}</td>

<td>

{{ item.IsActive ? ‘Active‘ : ‘In Active‘ }}</span>

</td>

<td>

</td>

<td>

</td>

</tr>

</table>

</div>

b) Edit.html

<h3>

{{ title }}</h3>

<hr />

<strong class="error">{{ error }}</strong>

First Name</label>

</div>

Last Name:</label>

</div>

Country:</label>

<option value="">-- Select Country --</option>

</select>

</div>

State:</label>

<option value="">-- Select State --</option>

</select>

</div>

Current Salary:</label>

</div>

Date of Birth:</label>

</div>

Description:</label>

</div>

<label>

<input type="checkbox" ng-model="active" />Active</label>

</div>

Submit</button>

</form>

c) Delete.html

<h3>

Are you want to sure to delete this record?</h3>

<hr />

First Name :</label>

{{ firstname }}</p>

</div>

Last Name :</label>

{{ lastname }}</p>

</div>

Country :</label>

{{ country }}</p>

</div>

State :</label>

{{ state }}</p>

</div>

Salary :</label>

{{ salary }}</p>

</div>

Date of Birth :</label>

{{ dob | date }}</p>

</div>

Description :</label>

{{ description }}</p>

</div>

{{ active ? ‘Active‘ : ‘In Active‘ }}</span>

</div>

Delete</button>

</div>

</form>

We had setup three views for list, create, edit and delete. Now we will implement the functionalities for these three views.

11) Create a controller.js file and add the following code given below:

var EmpControllers = angular.module("EmpControllers", []);

// this controller call the api method and display the list of employees

// in list.html

EmpControllers.controller("ListController", [‘$scope‘, ‘$http‘,

function ($scope, $http) {

$http.get(‘/api/employee‘).success(function (data) {

$scope.employees = data;

});

} ]

);

// this controller call the api method and display the record of selected employee

// in delete.html and provide an option for delete

EmpControllers.controller("DeleteController", [‘$scope‘, ‘$http‘, ‘$routeParams‘, ‘$location‘,

function ($scope, $http, $routeParams, $location) {

$scope.id = $routeParams.id;

$http.get(‘/api/employee/‘ + $routeParams.id).success(function (data) {

$scope.firstname = data.FirstName;

$scope.lastname = data.LastName;

$scope.country = data.Country;

$scope.state = data.State;

$scope.salary = data.Salary;

$scope.active = data.IsActive;

$scope.dob = data.DateofBirth;

$scope.description = data.Description;

});

$scope.delete = function () {

$http.delete(‘/api/Employee/‘ + $scope.id).success(function (data) {

$location.path(‘/list‘);

}).error(function (data) {

$scope.error = "An error has occured while deleting employee! " + data;

});

};

}

]);

// this controller call the api method and display the record of selected employee

// in edit.html and provide an option for create and modify the employee and save the employee record

EmpControllers.controller("EditController", [‘$scope‘, ‘$filter‘, ‘$http‘, ‘$routeParams‘, ‘$location‘,

function ($scope, $filter, $http, $routeParams, $location) {

$http.get(‘/api/country‘).success(function (data) {

$scope.countries = data;

});

$scope.id = 0;

$scope.getStates = function () {

var country = $scope.country;

if (country) {

$http.get(‘/api/country/‘+country).success(function (data) {

$scope.states = data;

});

}

else {

$scope.states = null;

}

$scope.save = function () {

var obj = {

EmployeeId: $scope.id,

FirstName: $scope.firstname,

LastName: $scope.lastname,

Country: $scope.country,

State: $scope.state,

Salary:$scope.salary,

IsActive: $scope.active,

Description: $scope.description,

DateofBirth: $scope.dob

};

if ($scope.id == 0) {

$http.post(‘/api/Employee/‘, obj).success(function (data) {

$location.path(‘/list‘);

}).error(function (data) {

$scope.error = "An error has occured while adding employee! " + data.ExceptionMessage;

});

}

else {

$http.put(‘/api/Employee/‘, obj).success(function (data) {

$location.path(‘/list‘);

}).error(function (data) {

console.log(data);

$scope.error = "An Error has occured while Saving customer! " + data.ExceptionMessage;

});

}

if ($routeParams.id) {

$scope.id = $routeParams.id;

$scope.title = "Edit Employee";

$http.get(‘/api/employee/‘ + $routeParams.id).success(function (data) {

$scope.firstname = data.FirstName;

$scope.lastname = data.LastName;

$scope.country = data.Country;

$scope.state = data.State;

$scope.salary = data.Salary;

$scope.active = data.IsActive;

$scope.description = data.Description;

$scope.dob = new Date(data.DateofBirth);

$scope.getStates();

});

}

else {

$scope.title = "Create New Employee";

}

]);

In this controller.js we have multiple controller for different views. Like ListController for list view (display the list of employees), Edit controller for edit view (create and modify the record), DeleteController for delete view (delete confirmation and delete the record).

Now all we have implement and successfully completed all the steps.

To test the process you can build and run an application. I hope it works fine.

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