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Home » Ajax Jquery In Mvc | Example Explained – The Html Page

Ajax Jquery In Mvc | Example Explained – The Html Page

(#39) Get data using ajax in mvc | mvc tutorial for beginners in .net c#

The ASP File – “gethint.asp”

The ASP file checks an array of names, and returns the corresponding name(s) to the browser:

response.expires=-1

dim a(30)

‘Fill up array with names

a(1)=”Anna”

a(2)=”Brittany”

a(3)=”Cinderella”

a(4)=”Diana”

a(5)=”Eva”

a(6)=”Fiona”

a(7)=”Gunda”

a(8)=”Hege”

a(9)=”Inga”

a(10)=”Johanna”

a(11)=”Kitty”

a(12)=”Linda”

a(13)=”Nina”

a(14)=”Ophelia”

a(15)=”Petunia”

a(16)=”Amanda”

a(17)=”Raquel”

a(18)=”Cindy”

a(19)=”Doris”

a(20)=”Eve”

a(21)=”Evita”

a(22)=”Sunniva”

a(23)=”Tove”

a(24)=”Unni”

a(25)=”Violet”

a(26)=”Liza”

a(27)=”Elizabeth”

a(28)=”Ellen”

a(29)=”Wenche”

a(30)=”Vicky”

‘get the q parameter from URL

q=ucase(request.querystring(“q”))

‘lookup all hints from array if length of q>0

if len(q)>0 then

hint=””

for i=1 to 30

if q=ucase(mid(a(i),1,len(q))) then

if hint=”” then

hint=a(i)

else

hint=hint & ” , ” & a(i)

end if

end if

next

end if

‘Output “no suggestion” if no hint were found

‘or output the correct values

if hint=”” then

response.write(“no suggestion”)

else

response.write(hint)

end if

%>

AJAX can be used for interactive communication with a database.

Demonstration: Implementation of Ajax using jQuery

Step 1

Create a new Project and choose ASP.NET MVC web application.

Step 2

Just Ignore the built-in Models and Controllers and make your own model.

Here I am creating a model called “Students” having properties studentID, studentName and studentAddress as shown below,


public class Student
{
[Key]
public int studentID { get; set; }
[Required]
public string studentName { get; set; }
[Required]
public string studentAddress { get; set; }
}

Add “using System.ComponentModel.DataAnnotations;” Attributes to Validate Model Data and then build the project once.

Step 3

Let’s create another model by inheriting the DbContext. It is a class that manages all the database operations, like database connection, and manages various entities of the Entity Model.

We can also say DbContext is a wrapper of ObjectContext. So, DbContext is a lightweight version of the ObjectContext and is exposes only the common features that are really required in programming.

Here I am creating a model called “StudentContext” as shown below,


public class StudentContext : DbContext
{
public DbSet

Students { get; set; }
}

Add “using System.Data.Entity;” that provides access to the core functionality of the entity framework.

Step 4

Now create a controller to written the code for inserting data into database, displaying data into view.

Here I am creating “Student” controller. Inside the Controller, I am creating an object of StudentContext for inserting and retrieving data from database. Also add the necessary namespace.


StudentContext context = new StudentContext();

Step 5

Now I’m creating the action methods for Inserting and retrieving the data to/from the database.

Here I am creating an [HttpPost] action method “createStudent” for inserting the JSON-Formatted data to database. I am Using [HttpPost] attribute to Save/Post the data as below:


[HttpPost]
public ActionResult createStudent(Student std)
{
context.Students.Add(std);
context.SaveChanges();
string message = "SUCCESS";
return Json(new { Message = message, JsonRequestBehavior.AllowGet });
}

Similarly, I am also creating JSON method “getStudent” to retrieve data from database and returning raw JSON data to be consumed by JavaScript in view as shown below,


public JsonResult getStudent(string id)
{
List

students = new List

();
students = context.Students.ToList();
return Json(students, JsonRequestBehavior.AllowGet);
}


Step 6

Now add a view to display the data and data inserting field. Here, I am adding a view named “Index.cshtml”. Then, write the HTML codes for making the data input field, submit button and also for displaying the data in same page. You can use bootstrap classes for designing. Here I am using bootstrap. My designing code is as below:

Please enter the details below.

ID Student Name Student Address

We can simply use the bootstrap class and call jQuery functions in ASP.NET MVC because during the project creation it will by default added to project and also linked to the template.

Step 7

Now I will write the script for inserting the data as well as retrieving and displaying it to the view. Just after the HTML code finished add the script shown below,


@section Scripts
{

}

We are using Ajax to refresh “tblStudent” so it refreshes only the particular table, rather than refreshing entire page. After clicking the “submitButton” the data from the input fields are taken in variable and redirected to action “createStudent” of “StudentController” to insert into the database. And, I have written a function “LoadData” to display the data from database to view continuously after inserting data. Inside “LoadData” function I am calling “getStudent” method which returns result in JSON and the JSON-Formatted data are presented in html by the underlying statements.

Step 8

Now, configure the Database connectionStrings in “web.config” file of the particular project as shown below,

In the above connectingString “StudentContext” is the name of class inherited from abstract Class “DbContext” in “StudentContext.cs” file. “RAVI-KANDEL” is the name of the Database Server and “Student” is the name of the Database. Change “RAVI-KANDEL” with your Database Server name. Finally, run your application and navigate to Student controller. Also you can configure “RouteConfig.cs” and set the controller to “Student” for direct navigation to the Student controller when loading the application.

You can add the records and can see added data in the table after the form-control as shown below,

Also, you can open the database server and see the data stored in database over there.

Please feel free to comment/feedback.

Happy Coding!

ASP AJAX

AJAX is about updating parts of a web page, without reloading the whole page.

(#39) Get data using ajax in mvc | mvc tutorial for beginners in .net c#
(#39) Get data using ajax in mvc | mvc tutorial for beginners in .net c#

What is AJAX?

AJAX = Asynchronous JavaScript and XML.

AJAX is a technique for creating fast and dynamic web pages.

AJAX allows web pages to be updated asynchronously by exchanging small amounts of data with the server behind the scenes. This means that it is possible to update parts of a web page, without reloading the whole page.

Classic web pages, (which do not use AJAX) must reload the entire page if the content should change.

Examples of applications using AJAX: Google Maps, Gmail, Youtube, and Facebook tabs.

Sử dụng jQuery Ajax trong ASP.NET MVC

Sử dụng jQuery Ajax trong ASP.NET MVC

Trong bài viết này hướng dẫn sử dụng jQuery ajax với các phương thức Action sử dụng http verbs tương ứng.

Địa chỉ URL trong jQuery Ajax
  • Được sử dụng truy cập thông qua trình duyệt url
  • Được sử dụng để gọi trong JQuery ajax


public JsonResult UrlResponse() //truy cập sử dụng Url { return Json(new { Name = "UrlResponse", Response = "Response from Get", Date = DateTime.Now.ToString("dd/MM/yyyy hh:mm:ss tt") }, JsonRequestBehavior.AllowGet); }

Loại giao thức trong jQuery Ajax
  • Có thể chỉ sử dụng cho gọi thông qua Ajax.
  • Nếu sử dụng trình duyệt truy cập sẽ tạo ra lỗi.


[HttpGet] public JsonResult TypedResponse() //Lỗi nếu truy cập sử dụng Url { return Json(new { Name = "TypedResponse", Response = "Response from Get", Date = DateTime.Now.ToString("dd/MM/yyyy hh:mm:ss tt") }, JsonRequestBehavior.AllowGet); }

Bây giờ chúng ta sẽ bắt đầu sử dụng phương thức action trong MVC, và sử dụng JQuery Ajax gọi $.ajax.
Một số thành phần trong cách gọi ajax

1. Xác định phương thức action trong MVC được gọi trong Ajax.Thuộc tính url trong $.ajax xác định controller và action trong MVC, theo định dạng /{controller}/{action}

Ví dụ:


url: ‘/User/Create’ url: ‘/User/Get/20’

Hoặc có thể sử dụng phương thức Url.Action để xác định controller và action.


url: ‘@Url.Action(“User”,”Create”)’

2. Xác định http verb sử dụng trong Ajax.Thuộc tính type với các giá trị ‘GET/ POST/ PUT/ DELETE’ sử dụng trong Ajax tương ứng với HttpVerbs trong phương thức action MVC.

Ví dụ:

Type : “POST”

3. Xác định tham số nếu phương thức action trong MVC có sử dụng tham số.

Thuộc tính data xác định dữ liệu được truyền cho tham số trong phương thức action.

Ví dụ:


data: JSON.stringify({ user: { name: ‘Rintu’, email: ‘[email protected]’ } }), data: { name: ‘Rintu’, email: ‘[email protected]’ },

4. Nhận dữ liệu trả về sau khi thực hiện thành công.

Thuộc tính success xác định hàm nhận dữ liệu trả về.

Ví dụ:


success: function (data) { alert(data); },

5. Nếu xảy ra lỗi, thuộc tính error xác định hàm nhận lỗi trả về.

Ví dụ:


error: function (xhr) { alert(‘error’); }

Truyền tham số cơ bản từ jQuery ajax đến phương thức action MVC

Trong UserController MVC chứa phương thức action:


[HttpGet] public JsonResult Get(int id) { return Json("Response from Get", JsonRequestBehavior.AllowGet); }

Cách gọi phương thức action Get trong ajax:


$.ajax({ url: '@Url.Action(“User”,”Get”), dataType: "json", type: "GET", contentType: 'application/json; charset=utf-8', data: {id:1}, async: true, processData: false, cache: false, success: function (data) { alert(data); }, error: function (xhr) { alert('error'); } });

Truyền tham số là đối tượng json từ jQuery ajax đến phương thức action MVC

Phương thức action Create trong UserController nhận đối tượng user làm tham số.


// POST: /User/Create [HttpPost] public JsonResult Create(User user) { return Json("Response from Create"); }

Cách gọi trong jQuery ajax.

Tạo dữ liệu kiểu json trong ajax để truyền cho phương thức Create trong MVC.


/*POST*/ $.ajax({ url: '@Url("User","Create"), dataType: "json", type: "POST", contentType: 'application/json; charset=utf-8', data: JSON.stringify({ user: { name: 'Rintu', email: '[email protected]' } }), async: true, processData: false, cache: false, success: function (data) { alert(data); }, error: function (xhr) { alert('error'); } })

Truyền tham số phức hợp từ jQuery ajax đến phương thức action MVC

Phương thức action Edit trong UserController nhận 2 tham sô: id và đối tượng user.


[HttpPost] public JsonResult Edit(int id, User user) { return Json("Response from Edit"); }

Cách gọi phương thức action Edit trong jQuery ajax.


$.ajax({ url: '/User/Edit', dataType: "json", type: "POST", contentType: 'application/json; charset=utf-8', data: JSON.stringify({ id: 100, user: {name: 'Rintu', email: '[email protected]'} }), async: true, processData: false, cache: false, success: function (data) { alert(data); }, error: function (xhr) { alert('error'); } });


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Ajax calls to .Net5 MVC Controllers (using JQuery)
Ajax calls to .Net5 MVC Controllers (using JQuery)

Example Explained – The HTML Page

When a user selects a customer in the dropdown list above, a function called “showCustomer()” is executed. The function is triggered by the “onchange” event:

Customer info will be listed here…

Source code explanation:

If no customer is selected (str.length==0), the function clears the content of the txtHint placeholder and exits the function.

If a customer is selected, the showCustomer() function executes the following:

  • Create an XMLHttpRequest object
  • Create the function to be executed when the server response is ready
  • Send the request off to a file on the server
  • Notice that a parameter (q) is added to the URL (with the content of the dropdown list)

Benefits of Ajax

  • Callbacks
  • Making Asynchronous Calls
  • User-Friendly
  • Improve the speed, performance and usability of a web application

Implementation of Ajax can be done in two way in ASP.Net Application

  • using Update Panel and,
  • using jQuery

What Advances have Been Made to Ajax?

JavaScript is the client-side scripting language and XML is a mark-up language to define data. And we have, JSON(JavaScript Object Notation) as another mark-up language to define data as well. JSON is much easier to use with JavaScript than XML. After the combination of JavaScript and Ajax, the XML Web Services are being replaced by JSON Web Services.

Another major advance to JavaScript and Ajax is the JavaScript object library called jQuery, which is the free, open-source software. It is a wrapper for JavaScript. jQuery is used to write the JavaScript to navigate and manipulate a page and make asynchronous Ajax callbacks.

Hence, Ajax callbacks have become standard programming practices by using jQuery and JSON Web Services for designing and developing web applications.

Use jQuery AJAX in ASP.NET CORE 6?  You NEED to see how it´s done!
Use jQuery AJAX in ASP.NET CORE 6? You NEED to see how it´s done!

The ASP File

The page on the server called by the JavaScript above is an ASP file called “getcustomer.asp”.

The source code in “getcustomer.asp” runs a query against a database, and returns the result in an HTML table:

response.expires=-1

sql=”SELECT * FROM CUSTOMERS WHERE CUSTOMERID=”

sql=sql & “‘” & request.querystring(“q”) & “‘”

set conn=Server.CreateObject(“ADODB.Connection”)

conn.Provider=”Microsoft.Jet.OLEDB.4.0″

conn.Open(Server.Mappath(“/datafolder/northwind.mdb”))

set rs=Server.CreateObject(“ADODB.recordset”)

rs.Open sql,conn

response.write(”

“)

do until rs.EOF

for each x in rs.Fields

response.write(”


” & x.name & ”

“)

response.write(”

” & x.value & ”

“)

next

rs.MoveNext

loop

response.write(“”)

%>

In this article I will explain with an example, how to use jQuery AJAX and JSON in ASP.Net MVC 5 Razor.
The Controller action method will be called using jQuery AJAX and JSON from View in ASP.Net MVC 5 Razor.

Model

Following is a Model class named PersonModel with two properties i.e. Name and DateTime.

public class PersonModel

///

/// Gets or sets Name.

///

public string Name { get; set; }

///

/// Gets or sets DateTime.

///

public string DateTime { get; set; }

Controller

The Controller consists of two Action methods.

Action method for handling GET operation

Inside this Action method, simply the View is returned.

Action method for handling jQuery AJAX operation

This Action method handles the call made from the jQuery AJAX function from the View.

Note: The following Action method handles AJAX calls and hence the return type is set to JsonResult.

The value of the name parameter is assigned to the Name property of the PersonModel object along with the Current DateTime and finally the PersonModel object is returned back as JSON to the jQuery AJAX function.

public class HomeController : Controller

// GET: Home

public ActionResult Index()

return View();

[HttpPost]

public JsonResult AjaxMethod(string name)

PersonModel person = new PersonModel

Name = name,

DateTime = DateTime.Now.ToString()

};

return Json(person);

View

Next step is to add a View for the Controller and while adding you will need to select the PersonModel class created earlier.

Inside the View, in the very first line the PersonModel class is declared as Model for the View. The View consists of an HTML TextBox element and a Button. The Button has been assigned a jQuery click event handler and when the Button is clicked a jQuery AJAX called is made to the Controller’s action method.

The following figure describes a jQuery AJAX call in ASP.Net MVC

The URL for the jQuery AJAX call is set to the Controller’s action method i.e. /Home/AjaxMethod. The value of the TextBox is passed as parameter and the returned response is displayed using JavaScript Alert Message Box.

@model jQuery_AJAX_MVC.Models.PersonModel

@{

Layout = null;

<br /> Index<br />

Screenshot

Downloads

What is Ajax?

As we all know, AJAX means Asynchronous JavaScript and XML. It is a client-side script that communicates to and from a server/database without the need for a postback or a complete page refresh. The Ajax speeds up response time.

In other words, Ajax is the method of exchanging data with a server, and updating parts of a web page, without reloading the entire page.

MVC 5 Master Details Using Jquery Ajax | Entity Framework
MVC 5 Master Details Using Jquery Ajax | Entity Framework

Demonstration: Implementation of Ajax using jQuery

Step 1

Create a new Project and choose ASP.NET MVC web application.

Step 2

Just Ignore the built-in Models and Controllers and make your own model.

Here I am creating a model called “Students” having properties studentID, studentName and studentAddress as shown below,


public class Student
{
[Key]
public int studentID { get; set; }
[Required]
public string studentName { get; set; }
[Required]
public string studentAddress { get; set; }
}

Add “using System.ComponentModel.DataAnnotations;” Attributes to Validate Model Data and then build the project once.

Step 3

Let’s create another model by inheriting the DbContext. It is a class that manages all the database operations, like database connection, and manages various entities of the Entity Model.

We can also say DbContext is a wrapper of ObjectContext. So, DbContext is a lightweight version of the ObjectContext and is exposes only the common features that are really required in programming.

Here I am creating a model called “StudentContext” as shown below,


public class StudentContext : DbContext
{
public DbSet

Students { get; set; }
}

Add “using System.Data.Entity;” that provides access to the core functionality of the entity framework.

Step 4

Now create a controller to written the code for inserting data into database, displaying data into view.

Here I am creating “Student” controller. Inside the Controller, I am creating an object of StudentContext for inserting and retrieving data from database. Also add the necessary namespace.


StudentContext context = new StudentContext();

Step 5

Now I’m creating the action methods for Inserting and retrieving the data to/from the database.

Here I am creating an [HttpPost] action method “createStudent” for inserting the JSON-Formatted data to database. I am Using [HttpPost] attribute to Save/Post the data as below:


[HttpPost]
public ActionResult createStudent(Student std)
{
context.Students.Add(std);
context.SaveChanges();
string message = "SUCCESS";
return Json(new { Message = message, JsonRequestBehavior.AllowGet });
}

Similarly, I am also creating JSON method “getStudent” to retrieve data from database and returning raw JSON data to be consumed by JavaScript in view as shown below,


public JsonResult getStudent(string id)
{
List

students = new List

();
students = context.Students.ToList();
return Json(students, JsonRequestBehavior.AllowGet);
}


Step 6

Now add a view to display the data and data inserting field. Here, I am adding a view named “Index.cshtml”. Then, write the HTML codes for making the data input field, submit button and also for displaying the data in same page. You can use bootstrap classes for designing. Here I am using bootstrap. My designing code is as below:

Please enter the details below.

ID Student Name Student Address

We can simply use the bootstrap class and call jQuery functions in ASP.NET MVC because during the project creation it will by default added to project and also linked to the template.

Step 7

Now I will write the script for inserting the data as well as retrieving and displaying it to the view. Just after the HTML code finished add the script shown below,


@section Scripts
{

}

We are using Ajax to refresh “tblStudent” so it refreshes only the particular table, rather than refreshing entire page. After clicking the “submitButton” the data from the input fields are taken in variable and redirected to action “createStudent” of “StudentController” to insert into the database. And, I have written a function “LoadData” to display the data from database to view continuously after inserting data. Inside “LoadData” function I am calling “getStudent” method which returns result in JSON and the JSON-Formatted data are presented in html by the underlying statements.

Step 8

Now, configure the Database connectionStrings in “web.config” file of the particular project as shown below,

In the above connectingString “StudentContext” is the name of class inherited from abstract Class “DbContext” in “StudentContext.cs” file. “RAVI-KANDEL” is the name of the Database Server and “Student” is the name of the Database. Change “RAVI-KANDEL” with your Database Server name. Finally, run your application and navigate to Student controller. Also you can configure “RouteConfig.cs” and set the controller to “Student” for direct navigation to the Student controller when loading the application.

You can add the records and can see added data in the table after the form-control as shown below,

Also, you can open the database server and see the data stored in database over there.

Please feel free to comment/feedback.

Happy Coding!

Khóa học này là một khóa học ngắn giúp các bạn tạo một màn hình thêm sửa xóa tìm kiếm phân trang sử dụng ASP.NET MVC và JQuery AJAX để thao tác là chính.

Nhằm giúp các bạn hiểu cách làm việc từ backend đến frontend, TEDU làm một khóa học nhỏ giúp các bạn tập làm việc với JQuery AJAX sử dụng ASP.NET MVC làm controller backend để truy cập dữ liệu. Trong khóa học có sử dụng Entity Framework CodeFirst để migration dữ liệu.

Kết thúc khóa học này học viên có thể thêm sửa xóa tìm kiếm và phân trang dữ liệu trong bảng với Bootstrap modal popup và Jquery AJAX. Đồng thời hiểu được cách phân trang dữ liệu lớn trong AJAX MVC.

Họ và tên: Toàn Bạch

Nghề nghiêp: Senior Fullstack .NET Developer

Kỹ năng: Có hơn 8 năm làm dự án về ASP.NET MVC, WebForm, Web Service, Web API, ASP.NET Core, Angular SQL Server, JQuery, SOLID, Design Pattern, DevOps.

On my MVC View I have button:

When I click this button I need call one Action, do some stuff there and then Submit my form.

I have this jQuery:


$('#btnSave').click(function () { $.ajax({ url: "/Home/SaveDetailedInfo", type: "POST", data: JSON.stringify({ 'Options': someData}), dataType: "json", traditional: true, contentType: "application/json; charset=utf-8", success: function (data) { if (data.status == "Success") { alert("Done"); } else { alert("Error occurs on the Database level!"); } }, error: function () { alert("An error has occured!!!"); } }); });

Then I want to submit my form. In Controller I have 2 Actions:


public ActionResult SaveDetailedInfo(Option[] Options) { return Json(new { status = "Success", message = "Success" }); } [HttpPost] public ActionResult Save() { return RedirectToAction("Index", "Home"); }

The problem is when I have

type="submit"

in my button, I can’t reach

SaveDetailedInfo

Action, cause ajax gives me

error

, but when I remove

type="submit"

, ajax works fine, but

Save

Action never executes.

Please, any ideas how to execute both Actions? I thought maybe after

Ajax > Success

try to add

type=submit

through jquery and use

.click()

, but it sounds strange to me.

Before diving into the core topic let’s have an overview about JQuery and Ajax. What is it? What is JQuery? Well, JQuery is a framework (tools) for writing JavaScript, Written as “write less, do more”, jQuery is to make easier to use JavaScript. What is JavaScript? JavaScript is an object-oriented computer programming (Scripting) language commonly used to create interactive effects within web browsers. Let’s have a sample example: We have a submit button in our JQuery AJAX MVC application. Let’s try to show a message when it is clicked. Here is our button with defined id=”btnSubmit”:

Now we need to write some script to do that, here is some JavaScript code:

  1. var myBtn = document.getElementById(‘btnSubmit’);
  2. myBtn.addEventListener(‘click’, function(e) {
  3. e.preventDefault();
  4. alert(‘Hello’);
  5. });

By this code the result will show “Hello”: Now if we can get the same result by using jQuery instead of it. Let’s have a look:

  1. $(‘#btnSubmit’).click(function(event) {
  2. event.preventDefault();
  3. alert(“Hello”);
  4. });

Note: Here use of ‘e’ is just a short for event which raised the event. We can pass any variable name. Notice that the ‘e’ is changed to name ‘event’ in JQuery part. This piece of code is also producing the same result “Hello”. This is why jQuery is known as “write less, do more”. Finally the script:

Let’s focus on Ajax: AJAX stands for “Asynchronous JavaScript and XML”. AJAX is about exchanging data with a server, without reloading the whole page. It is a technique for creating fast and dynamic web pages. In .NET, we can call server side code using two ways:

  1. ASP .NET AJAX
  2. jQuery AJAX

In this article we will focus on JQuery Ajax. $.ajax () Method: JQuery’s core method for creating Ajax requests. Here are some jQuery AJAX methods:

  • $.ajax() Performs an async AJAX request.
  • $.get() Loads data from a server using an AJAX HTTP GET request.
  • $.post() Loads data from a server using an AJAX HTTP POST request.

To know more click. $.ajax () Method Configuration option: Options that we use:

  • async:
  • type:
  • url:
  • data:
  • datatype:
  • success:
  • error:

Let’s have details overview: async Set to false if the request should be sent synchronously. Defaults to true. Note that if you set this option to false, your request will block execution of other code until the response is received. Example:

type This is type of HTTP Request and accepts a valid HTTP verb. The type of the request, “POST” or “GET” defaults to “GET”. Other request types, such as “PUT” and “DELETE” can be used, but they may not be supported by all the web browsers. Example:

url The URL for the request. Example:

data The data to be sent to the server. This can either be an object or a query string. Example:

  1. data: JSON.stringify(model_data),

dataType The type of data you expect back from the server. By default, jQuery will look at the MIME type of the response if no dataType is specified. Accepted values are text, xml, json, script, html jsonp. Example:

contentType This is the content type of the request you are making. The default is ‘application/x-www-form-urlencoded’. Example:

  1. contentType: ‘application/json; charset=utf-8’,

success A callback function to run if the request succeeds. The function receives the response data (converted to a JavaScript object if the DataType was JSON), as well as the text status of the request and the raw request object.

  1. Success: function (result) {
  2. $(‘#result’).html(result);

error A callback function to run if the request results in an error. The function receives the raw request object and the text status of the request.

  1. error: function (result) {
  2. alert(‘Error occured!!’);
  3. },

Let’s Post Values using JQuey,Ajax: We often use the jQuery Ajax method in ASP.NET Razor Web Pages. Here is a sample code:

Controller Action:

  1. [HttpPost]
  2. public ActionResult JqAJAX(Student st) {
  3. try {
  4. return Json(new {
  5. msg = “Successfully added ” + st.Name
  6. });
  7. } catch (Exception ex) {
  8. throw ex;

Posting JSON JSON is a data interchange format where values are converted to a string. The recommended way to create JSON is include the JSON.stringify method. In this case we have defined:

And the data type set to:

And the content type set to application/json

  1. contentType: ‘application/json; charset=utf-8’

Syntax: JSON.stringify(value[, replacer[, space]]) Post Script:

  1. var Student = {
  2. ID: ‘10001’,
  3. Name: ‘Shashangka’,
  4. Age: 31
  5. };
  6. $.ajax({
  7. type: “POST”,
  8. url: “/Home/JqAJAX”,
  9. data: JSON.stringify(Student),
  10. contentType: ‘application/json; charset=utf-8’,
  11. success: function(data) {
  12. alert(data.msg);
  13. },
  14. error: function() {
  15. alert(“Error occured!!”)
  16. });

Controller Action:

  1. [HttpPost]
  2. public ActionResult JqAJAX(Student st) {
  3. try {
  4. return Json(new {
  5. msg = “Successfully added ” + st.Name
  6. });
  7. } catch (Exception ex) {
  8. throw ex;

JSON Response Result: Sent data format: {“ID”:”10001″,”Name”:”Shashangka”,”Age”:31} Received Data format: {“msg”:”Successfully added Shashangka”} Let’s Post JavaScript Objects: To send JavaScript Objects we need to omit the JSON.stringify(Student) method and we need to pass the plain object to the data option. In this case we have defined:

And the datatype set to:

And the content type set to default.

  1. contentType: ‘application/x-www-form-urlencoded’

Post Script:

  1. var Student = {
  2. ID: ‘10001’,
  3. Name: ‘Shashangka’,
  4. Age: 31
  5. };
  6. $.ajax({
  7. type: “POST”,
  8. url: “/Home/JqAJAX”,
  9. data: Student,
  10. contentType: ‘application/x-www-form-urlencoded’,
  11. datatype: “html”,
  12. success: function(data) {
  13. alert(data.msg);
  14. },
  15. error: function() {
  16. alert(“Error occured!!”)
  17. });

Controller Action:

  1. [HttpPost]
  2. public ActionResult JqAJAX(Student st) {
  3. try {
  4. return Json(new {
  5. msg = “Successfully added ” + st.Name
  6. });
  7. } catch (Exception ex) {
  8. throw ex;

JavaScript Objects Response Result: Sent data format: ID=10001&Name=Shashangka&Age=31 Received Data format: {“msg”:”Successfully added Shashangka”} Let’s Post JavaScript Arrays: To send Array we need to omit the JSON.stringify(Student) method and we need to pass the plain object to the data option. In this case we have defined:

And the datatype set to:

And the content type set to default

  1. contentType: ‘application/x-www-form-urlencoded’

Post Script:

  1. var ID = [“Shashangka”, “Shekhar”, “Mandal”];
  2. $.ajax({
  3. type: “POST”,
  4. url: “/Home/JqAJAX”,
  5. data: {
  6. values: ID
  7. },
  8. datatype: “html”,
  9. contentType: ‘application/x-www-form-urlencoded’,
  10. success: function(data) {
  11. alert(data.msg);
  12. },
  13. error: function() {
  14. alert(“Error occured!!”)
  15. });

Controller Action:

  1. [HttpPost]
  2. public ActionResult JqAJAX(string[] values) {
  3. try {
  4. return Json(new {
  5. msg = String.Format(“Fist Name: {0}”, values[0])
  6. });
  7. } catch (Exception ex) {
  8. throw ex;

Array Response Result: Sent data format: values[]=Shashangka&values[]=Shekhar&values[]=Mandal Received Data format: {“msg”:”Fist Name: Shashangka”} Hope this will help to understand different datatypes and Ajax posting. Thanks!

Tiếp tục với các bài viết trước, nay mình chia sẻ cách phân trang bằng Ajax trong ASP.NET MVC 5. Bài trước mình làm phân trang đơn giản bạn có thể xem lại tại đây

Bài này mình dùng code của bài trước chỉ sửa lại xiu là được! ::)Bạn mở file HomeController.cs trong thư mục Controllers lên và chỉnh thêm cho mình như code sau:

public ActionResult Lists() { return View(); } [HttpGet] public JsonResult getAllPost(string txtSearch, int? page) { var data = (from s in _db.Posts select s); if (!String.IsNullOrEmpty(txtSearch)) { ViewBag.txtSearch = txtSearch; data = data.Where(s => s.Title.Contains(txtSearch)); } if (page > 0) { page = page; } else { page = 1; } int start = (int)(page – 1) * pageSize; ViewBag.pageCurrent = page; int totalPage = data.Count(); float totalNumsize = (totalPage / (float)pageSize); int numSize = (int)Math.Ceiling(totalNumsize); ViewBag.numSize = numSize; var dataPost = data.OrderByDescending(x => x.Id).Skip(start).Take(pageSize); List listPost = new List (); listPost = dataPost.ToList(); // return Json(listPost); return Json(new { data = listPost,pageCurrent = page,numSize=numSize }, JsonRequestBehavior.AllowGet); }

+ getAllPost(): return về dữ liệu Json cho phía client xử lý, đồng thời cũng nhận dữ liệu từ client gửi đến để xử lý phân trang+ Lists(): return về View, do đó đồi hỏi bạn phải tạo một khung nhìn(View), sau khi tạo xong bạn sẽ được file Lists.cshtml trong thư mục Views/Post/Lists.cshtmlbạn open và chỉnh sửa giao điện file như sau:

@model MVC5_HelloWorld.Models.Post

List Posts

Add
Search
STT Title Body Created_at Updated_at Edit Delete

Chú ý: chổ class=”load-list” và id=”load-pagination” dùng để hiển thị nội dùng ra và hiển thị nút phân trang

Xong giờ ta thiết lập code Ajax để xử lý phân trang trong ASP.NET MVC 5 thôi nào, trong đoạn code dưới đây mình có chú thích từng sự kiện, đoạn code dài quá, nên mình tách ra, cho dễ hình dung nghe

$(document).ready(function () { //function load pagination var load = function (txtSearch, page) { $.ajax({ url: ‘@Url.Action(“getAllPost”,”Post”)’, type: “GET”, data: { txtSearch:txtSearch , page: page }, dataType: ‘json’, contentType: ‘application/json;charset=utf-8’, success: function (result) { console.log(result); var str = “”; $.each(result.data, function (index, value) { //convert date to string var dateCreated = value.Created_at; var dateCreated_string = new Date(parseInt(dateCreated.replace(“/Date(“, “”).replace(“)/”, “”), 10)); var created_at = dateCreated_string.getFullYear() + “/” + dateCreated_string.getMonth() + “/” + dateCreated_string.getDate(); var dateUpdated = value.Updated_at; var dateUpdated_string = new Date(parseInt(dateUpdated.replace(“/Date(“, “”).replace(“)/”, “”), 10)); var Updated_at = dateUpdated_string.getFullYear() + “/” + dateUpdated_string.getMonth() + “/” + dateUpdated_string.getDate(); // //create list post var dateUpdated = new Date(value.Updated_at); str += ”

“; str += ”

“+(value.Id)+”

“; str += ”

“+value.Title + ”

“; str += ”

” + value.Body + ”

“; str += ”

” + created_at+ ”

“; str += ”

“+ Updated_at + ”

“; str += ”


Modify

“; str += ”


Delete

“; str += ”

“; //create pagination var pagination_string = “”; var pageCurrent = result.pageCurrent; var numSize = result.numSize; //create button previous if (pageCurrent > 1) { var pagePrevious = pageCurrent – 1; pagination_string += ‘


  • Previous
  • ‘; } for (i = 1; i <= numSize; i++){ if (i == pageCurrent) { pagination_string += ‘


  • ‘+pageCurrent+’
  • ‘; } else { pagination_string += ‘


  • ‘+i+’
  • ‘; } } //create button next if (pageCurrent > 0 && pageCurrent < numSize) { var pageNext = pageCurrent + 1; pagination_string += ‘


  • Next
  • ‘; } //load pagination $(“#load-pagination”).html(pagination_string); }); //load str to class=”load-list” $(“.load-list”).html(str); } }); } //load init load(null, 1); });

    Bên trên là đoạn code mình xử lý load phân trang, mình sẽ chèn vào 2 tham số (txtSearch,page), thông thường ban đầu, page=1, txtSearch=null

    url: ‘@Url.Action(“getAllPost”,”Post”)’: sẽ đi đến function getAllPost() file HomeControlle.cs, sao đó xử lý xong, return về dữ liệu theo kiểu Json

    Các bạn có thể nhìn thấy mình có nhận dữ liệu về là kiểu Json, sao đó dùng $.earch() để lập dữ liệu ra. Bên cạnh đó bạn xem thẻ trong đoạn code trên mình có khai báo, giúp ta có thể dùng Ajax lấy ra số page để hiển thị

    Tiếp tục ta xây dựng sự kiện click phân trang: ta sẽ click vào để lấy giá trị page

    //click event pagination $(“body”).on(“click”,”.pagination li a”,function (event) { event.preventDefault(); var page = $(this).attr(‘data-page’); //load event pagination var txtSearch = $(“.txtSearch”).val(); if (txtSearch != “”) { load(txtSearch, page) } else { load(null, page); } });

    Trong đoạn code trên mình click vào thẻ để lấy dữ liệu từ page-page, sau đó chèn vào hàm load(txtSearch,page) để gọi Ajax

    Tiếp tục ta xây dựng hàm tìm kiếm

    //click event search $(“#search”).click(function () { var txtSearch = $(“.txtSearch”).val(); if (txtSearch != “”) { load(txtSearch, 1) } else { load(null, 1); } });

    Đoạn code bên trên mình bắt sự kiện click tìm kiếm, sao đó lấy giá trị tìm kiếm chèn vào làm load()

    Đoạn code Full Ajax

    $(document).ready(function () { //function load pagination var load = function (txtSearch, page) { $.ajax({ url: ‘@Url.Action(“getAllPost”,”Post”)’, type: “GET”, data: { txtSearch:txtSearch , page: page }, dataType: ‘json’, contentType: ‘application/json;charset=utf-8’, success: function (result) { console.log(result); var str = “”; $.each(result.data, function (index, value) { //convert date to string var dateCreated = value.Created_at; var dateCreated_string = new Date(parseInt(dateCreated.replace(“/Date(“, “”).replace(“)/”, “”), 10)); var created_at = dateCreated_string.getFullYear() + “/” + dateCreated_string.getMonth() + “/” + dateCreated_string.getDate(); var dateUpdated = value.Updated_at; var dateUpdated_string = new Date(parseInt(dateUpdated.replace(“/Date(“, “”).replace(“)/”, “”), 10)); var Updated_at = dateUpdated_string.getFullYear() + “/” + dateUpdated_string.getMonth() + “/” + dateUpdated_string.getDate(); // //create list post var dateUpdated = new Date(value.Updated_at); str += ”

    “; str += ”

    “+(value.Id)+”

    “; str += ”

    “+value.Title + ”

    “; str += ”

    ” + value.Body + ”

    “; str += ”

    ” + created_at+ ”

    “; str += ”

    “+ Updated_at + ”

    “; str += ”


    Modify

    “; str += ”


    Delete

    “; str += ”

    “; //create pagination var pagination_string = “”; var pageCurrent = result.pageCurrent; var numSize = result.numSize; //create button previous if (pageCurrent > 1) { var pagePrevious = pageCurrent – 1; pagination_string += ‘


  • Previous
  • ‘; } for (i = 1; i <= numSize; i++){ if (i == pageCurrent) { pagination_string += ‘


  • ‘+pageCurrent+’
  • ‘; } else { pagination_string += ‘


  • ‘+i+’
  • ‘; } } //create button next if (pageCurrent > 0 && pageCurrent < numSize) { var pageNext = pageCurrent + 1; pagination_string += ‘


  • Next
  • ‘; } //load pagination $(“#load-pagination”).html(pagination_string); }); //load str to class=”load-list” $(“.load-list”).html(str); } }); } //click event pagination $(“body”).on(“click”,”.pagination li a”,function (event) { event.preventDefault(); var page = $(this).attr(‘data-page’); //load event pagination var txtSearch = $(“.txtSearch”).val(); if (txtSearch != “”) { load(txtSearch, page) } else { load(null, page); } }); //click event search $(“#search”).click(function () { var txtSearch = $(“.txtSearch”).val(); if (txtSearch != “”) { load(txtSearch, 1) } else { load(null, 1); } }); //load init load(null, 1); });

    Demo:

    Benefits of Ajax

    • Callbacks
    • Making Asynchronous Calls
    • User-Friendly
    • Improve the speed, performance and usability of a web application

    Implementation of Ajax can be done in two way in ASP.Net Application

    • using Update Panel and,
    • using jQuery

    What Advances have Been Made to Ajax?

    JavaScript is the client-side scripting language and XML is a mark-up language to define data. And we have, JSON(JavaScript Object Notation) as another mark-up language to define data as well. JSON is much easier to use with JavaScript than XML. After the combination of JavaScript and Ajax, the XML Web Services are being replaced by JSON Web Services.

    Another major advance to JavaScript and Ajax is the JavaScript object library called jQuery, which is the free, open-source software. It is a wrapper for JavaScript. jQuery is used to write the JavaScript to navigate and manipulate a page and make asynchronous Ajax callbacks.

    Hence, Ajax callbacks have become standard programming practices by using jQuery and JSON Web Services for designing and developing web applications.

    ASP.NET MVC -  #28: Cách gọi AJAX trong ASP.NET MVC | AJAX call in ASP.NET MVC | TEDU
    ASP.NET MVC – #28: Cách gọi AJAX trong ASP.NET MVC | AJAX call in ASP.NET MVC | TEDU

    AJAX is Based on Internet Standards

    AJAX is based on internet standards, and uses a combination of:

    • XMLHttpRequest object (to exchange data asynchronously with a server)
    • JavaScript/DOM (to display/interact with the information)
    • CSS (to style the data)
    • XML (often used as the format for transferring data)

    AJAX applications are browser- and platform-independent!

    What is Ajax?

    As we all know, AJAX means Asynchronous JavaScript and XML. It is a client-side script that communicates to and from a server/database without the need for a postback or a complete page refresh. The Ajax speeds up response time.

    In other words, Ajax is the method of exchanging data with a server, and updating parts of a web page, without reloading the entire page.

    ASP.Net MVC - Loading Partial views using AJAX/jQuery
    ASP.Net MVC – Loading Partial views using AJAX/jQuery

    Using Ajax in Asp.Net MVC

    Ajax

    So starting of from the beginning Ajax is used for Asynchronous Javascript and XML. We can use it for many purposes. Few basic uses of Ajax are:-

    • Update page without reloading the page providing better performance.
    • Request data from a server – after the page has loaded which can be used in loading Partial Views.
    • Send data to a server without reload – in the background making it easier to performance Save, Delete operations smoothly.

    Ajax in Asp.Net MVC

    Ajax can be used anywhere where we can use jquery. But we will be watching few examples of different ways of using Ajax in Asp.Net MVC. We will be posting data on MVC Controller without refreshing the page. So let’s start from beginning:-

    Step-1

    So , first of all we will be creating a new view and adding few field on it . Now we will be trying to send the values of these fields on controller without reload and especially using Ajax.

    So We will add a new view and few fields on it.

    @{ ViewBag.Title = “Home Page”; }

    Ajax Call Getting started

    @{ ViewBag.Title = “Home Page”; }

    FULL MATCH: MÃ Minh Cẩm - Frederic CAUDRON | Bán Kết PBA - Silkroad & Ansan PBA Championship 23-24
    FULL MATCH: MÃ Minh Cẩm – Frederic CAUDRON | Bán Kết PBA – Silkroad & Ansan PBA Championship 23-24

    Example Explained

    In the example above, when a user types a character in the input field, a function called “showHint()” is executed.

    The function is triggered by the onkeyup event.

    Here is the HTML code:

    Example


    Start typing a name in the input field below:

    First name:

    Suggestions:

    Code explanation:

    First, check if the input field is empty (str.length == 0). If it is, clear the content of the txtHint placeholder and exit the function.

    However, if the input field is not empty, do the following:

    • Create an XMLHttpRequest object
    • Create the function to be executed when the server response is ready
    • Send the request off to an ASP file (gethint.asp) on the server
    • Notice that q parameter is added gethint.asp?q=”+str
    • The str variable holds the content of the input field

    Ajax Call Getting started

    $(function () { $(“#btnGet”).click(function () { var empIds = $(“#txtId”).val(); var empNames = $(“#txtName”).val(); var empSalarys = $(“#txtSalary”).val(); $.ajax({ type: “POST”, url: “/Home/AjaxMethod”, data: ‘{empId: “‘ + empIds + ‘” , empName: “‘ + empNames + ‘” , empSalary: “‘ + empSalarys + ‘” }’, contentType: “application/json; charset=utf-8”, dataType: “json”, success: function (response) { alert(“Hello: ” + response.EmpName + ” Your Employee Id Is: ” + response.EmpId + “And Your Salary Is: ” + response.EmpSalary); }, failure: function (response) { alert(response.responseText); }, error: function (response) { alert(response.responseText); } }); }); });

    [HttpPost] public JsonResult AjaxMethod(string empId, string empName, string empSalary) { PersonModel person = new PersonModel { EmpId = empId, EmpName = empName, EmpSalary = empSalary }; return Json(person); }

    // second $(function () { $(“#btnGet2”).click(function () { debugger; var empIds = $(“#txtId”).val(); var empNames = $(“#txtName”).val(); var empSalarys = $(“#txtSalary”).val(); $.ajax({ url: “/Home/AjaxMethod”, dataType: “json”, type: “POST”, cache: false, data: { empId: empIds, empName: empNames, empSalary: empSalarys }, success: function (response) { alert(“Hello: ” + response.EmpName + ” Your Employee Id Is: ” + response.EmpId + “And Your Salary Is: ” + response.EmpSalary); }, failure: function (response) { alert(response.responseText); }, error: function (response) { alert(response.responseText); } }) }) });

    [HttpPost] public JsonResult AjaxMethod(string empId, string empName, string empSalary) { PersonModel person = new PersonModel { EmpId = empId, EmpName = empName, EmpSalary = empSalary }; return Json(person); }

    //third $(function () { $(“#btnGet3”).click(function () { var intrestedInAll = { EmpId: $(“#txtId”).val(), EmpName: $(“#txtName”).val(), EmpSalary: $(“#txtSalary”).val(), }; debugger; $.ajax({ url: ‘/Home/AjaxMethodWithObject’, type: ‘POST’, data: { “queryFilter”: JSON.stringify(intrestedInAll) }, cache: false, success: function (response) { alert(“Hello: ” + response.EmpName + ” Your Employee Id Is: ” + response.EmpId + “And Your Salary Is: ” + response.EmpSalary); }, failure: function (response) { alert(response.responseText); }, error: function (response) { alert(response.responseText); } }); }); });

    [HttpPost] public JsonResult AjaxMethodWithObject(string queryFilter) { PersonModel personModel = JsonConvert.DeserializeObject (queryFilter); return Json(personModel); }

    //fourth $(function () { $(“#btnGet4”).click(function () { var personModel = { EmpId: $(“#txtId”).val(), EmpName: $(“#txtName”).val(), EmpSalary: $(“#txtSalary”).val(), }; personModel = JSON.stringify(personModel); debugger; $.ajax({ type: “POST”, url: “/Home/AjaxMethodWithModel”, data: personModel, dataType: “json”, contentType: ‘application/json; charset=utf-8’, success: function (response) { alert(“Hello: ” + response.EmpName + ” Your Employee Id Is: ” + response.EmpId + “And Your Salary Is: ” + response.EmpSalary); }, failure: function (response) { alert(response.responseText); }, error: function (response) { alert(response.responseText); } }); }); });

    [HttpPost] public JsonResult AjaxMethodWithModel(PersonModel personModel) { PersonModel person = new PersonModel { EmpId = personModel.EmpId, EmpName = personModel.EmpName, EmpSalary = personModel.EmpSalary }; return Json(person); }

    //fifth function GetAjaxDataPromise(url, postData) { debugger; var promise = $.post(url, postData, function (promise, status) { }); return promise; }; $(function () { $(“#btnGet5”).click(function () { debugger; var promises = GetAjaxDataPromise(‘@Url.Action(“AjaxMethod”, “Home”)’, { EmpId: $(“#txtId”).val(), EmpName: $(“#txtName”).val(), EmpSalary: $(“#txtSalary”).val() }); promises.done(function (response) { debugger; alert(“Hello: ” + response.EmpName + ” Your Employee Id Is: ” + response.EmpId + “And Your Salary Is: ” + response.EmpSalary); }); }); });

    [HttpPost] public JsonResult AjaxMethod(string empId, string empName, string empSalary) { PersonModel person = new PersonModel { EmpId = empId, EmpName = empName, EmpSalary = empSalary }; return Json(person); }

    [HttpPost] public JsonResult AjaxMethodWithModel(PersonModel personModel) { PersonModel person = new PersonModel { EmpId = personModel.EmpId, EmpName = personModel.EmpName, EmpSalary = personModel.EmpSalary }; return Json(person); }

    The complete code for controller is

    public class HomeController : Controller { public ActionResult Index() { return View(); } [HttpPost] public JsonResult AjaxMethod(string empId, string empName, string empSalary) { PersonModel person = new PersonModel { EmpId = empId, EmpName = empName, EmpSalary = empSalary }; return Json(person); } [HttpPost] public JsonResult AjaxMethodWithObject(string queryFilter) { PersonModel personModel = JsonConvert.DeserializeObject (queryFilter); return Json(personModel); } [HttpPost] public JsonResult AjaxMethodWithModel(PersonModel personModel) { PersonModel person = new PersonModel { EmpId = personModel.EmpId, EmpName = personModel.EmpName, EmpSalary = personModel.EmpSalary }; return Json(person); } }

    Response-

    So When jquery ajax request completed you can check the response from success method. You can check in the examples above. So this is how we can use Ajax in Asp.Net MVC.

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    .NET Core MVC CRUD using .NET Core Web API and ajax call | Consume secured .NET Core API in MVC

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