What is the best way to send data to an API controller using AJAX in an MVC framework?

Question

What is the best way to send data to an API controller using AJAX in an MVC framework?

I am facing an issue with POSTing a string data to the api controller in mvc using ajax. Despite my efforts, the data does not seem to reach the api controller. Here is what I have attempted:

This is the JavaScript code I have used:

        
        jQuery(function () {
            $(function () {
                $(".listing-listing").html("");
                
                const jsonData = { PageNom: 1, ShowInPage: 25 };
                var data = JSON.stringify(jsonData);
                
                $.ajax({
                    url: '/Api/apiListProduct/AjaxSearchAsync',
                    type: 'POST',
                    data: data,
                    dataType: 'jsonResult',
                    contentType: "application/json; charset=utf-8",
                    success: function (result) {
                        if (result.Data.Succeed) {
                            result.Data.ProductLst.forEach((product) => AddProduct(product));
                            //$('.PaginationCell').html(result.Data.Pagination);
                        }
                    },
                    error: function (e) {
                        // handle error
                    }
                });
            });
        });

And here is the corresponding api controller:


        public class apiListProduct : ApiController {
            [System.Web.Http.HttpPost]
            public async System.Threading.Tasks.Task<System.Web.Mvc.JsonResult> AjaxSearchAsync()
            {
                string raw = "";
                using (var contentStream = await Request.Content.ReadAsStreamAsync())
                {
                    contentStream.Seek(0, System.IO.SeekOrigin.Begin);
                    
                    using (var sr = new System.IO.StreamReader(contentStream))
                    {
                        raw = sr.ReadToEnd();
                    }
                }
            }
        }

Your assistance in resolving this issue with the web API route for the api controller will be greatly appreciated. Thank you.

javascript c#ajax asp.net-mvc asp.net-core

Answer 1

Answer №1

I am facing an issue with posting string data to an API controller in MVC using Ajax. Despite my attempts, the data does not reach the API controller. How can I successfully send data to the API controller through Ajax in MVC?

Based on your explanation and code snippet, it would be helpful if you provide the complete API controller code and specify the version of ASP.NET Core you are using.

After reviewing your code, I have identified two potential problems.

Firstly, the definition of your API route is crucial for this process to work correctly.

Another issue lies in the usage of

Request.Content.ReadAsStreamAsync

. Instead of this, try reading the request body content using HttpContext.Request.Body, as it accesses the request body Stream.

To resolve this problem, I suggest trying the following approach that has been successful:

Here is a practical example of how you can send your Ajax request to the API controller:

API Controller:

[Route("api/[controller]")]
[ApiController]
public class ApiListProductController : ControllerBase
{
    [HttpPost]
    [Route("AjaxSearchAsync")]
    public async Task<IActionResult> AjaxSearchAsync()
    {
        string raw = "";
        using (var contentStream = HttpContext.Request.Body)
        {
            using (var sr = new System.IO.StreamReader(contentStream))
            {
                raw = await sr.ReadToEndAsync();
            }
        }
        return Ok(raw);
    }
}

Note: If your API project and MVC project are separate, you can remove the route annotation

[Route("AjaxSearchAsync")]

. However, if they are within the same project, use an explicit route. Please refer to route details here.

Request Payload:

https://i.sstatic.net/pKZSf.png

Request Body:

https://i.sstatic.net/zeBYo.png

Output:

https://i.sstatic.net/yBKBn.gif

Alternatively, you can use a strongly-typed model to retrieve the parameters posted from the Ajax request. Here is an example of such a model:

public class SearchModel
{
    public int PageNumber { get; set; }
    public int ItemsPerPage { get; set; }
}

Controller:

[HttpPost]
[Route("AjaxSearchAsyncApproachTwo")]
public async Task<IActionResult> AjaxSearchAsyncApproachTwo(SearchModel searchModel)
{

    return Ok(searchModel);
}

Request Payload:

https://i.sstatic.net/w3uI0.png

Request Body:

https://i.sstatic.net/o57zI.png

Note: Based on my test, your JavaScript/jQuery code appears to be correct. You can choose either of the above methods to read the request body or request parameters. Additionally, please refer to this official document for more information.

Answer 2

I am facing an issue with posting string data to an API controller in MVC using Ajax. Despite my attempts, the data does not reach the API controller. How can I successfully send data to the API controller through Ajax in MVC?

Based on your explanation and code snippet, it would be helpful if you provide the complete API controller code and specify the version of ASP.NET Core you are using.

After reviewing your code, I have identified two potential problems.

Firstly, the definition of your API route is crucial for this process to work correctly.

Another issue lies in the usage of

Request.Content.ReadAsStreamAsync

. Instead of this, try reading the request body content using HttpContext.Request.Body, as it accesses the request body Stream.

To resolve this problem, I suggest trying the following approach that has been successful:

Here is a practical example of how you can send your Ajax request to the API controller:

API Controller:

[Route("api/[controller]")]
[ApiController]
public class ApiListProductController : ControllerBase
{
    [HttpPost]
    [Route("AjaxSearchAsync")]
    public async Task<IActionResult> AjaxSearchAsync()
    {
        string raw = "";
        using (var contentStream = HttpContext.Request.Body)
        {
            using (var sr = new System.IO.StreamReader(contentStream))
            {
                raw = await sr.ReadToEndAsync();
            }
        }
        return Ok(raw);
    }
}

Note: If your API project and MVC project are separate, you can remove the route annotation

[Route("AjaxSearchAsync")]

. However, if they are within the same project, use an explicit route. Please refer to route details here.

Request Payload:

https://i.sstatic.net/pKZSf.png

Request Body:

https://i.sstatic.net/zeBYo.png

Output:

https://i.sstatic.net/yBKBn.gif

Alternatively, you can use a strongly-typed model to retrieve the parameters posted from the Ajax request. Here is an example of such a model:

public class SearchModel
{
    public int PageNumber { get; set; }
    public int ItemsPerPage { get; set; }
}

Controller:

[HttpPost]
[Route("AjaxSearchAsyncApproachTwo")]
public async Task<IActionResult> AjaxSearchAsyncApproachTwo(SearchModel searchModel)
{

    return Ok(searchModel);
}

Request Payload:

https://i.sstatic.net/w3uI0.png

Request Body:

https://i.sstatic.net/o57zI.png

Note: Based on my test, your JavaScript/jQuery code appears to be correct. You can choose either of the above methods to read the request body or request parameters. Additionally, please refer to this official document for more information.

What is the best way to send data to an API controller using AJAX in an MVC framework?

Answer №1

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