Ways to retrieve information from an ajax request within an MVC controller

Question

Ways to retrieve information from an ajax request within an MVC controller

Within my MVC controller, I have implemented a method to query a database and return a JSON object. To achieve this, an ajax call is necessary to provide a date for the database query. However, I am encountering an issue where null is being passed to the controller within my current configuration.

Here is an excerpt from my ajax request:

$(document).ready(function () {
        setInterval(function () {
            $.ajax({
                type: "POST",
                url: '@Url.Action("GetChartData", "Plot")',
                dataType:'json',
                data: '04-15-2019 15:49:00',
                success: function (result) {
                    console.log(JSON.parse(result));
                }
            });
        }, 10000);
    });

The corresponding controller code looks like this:

[HttpPost]
public JsonResult GetChartData(string timeStamp)
{
    string output = queryDatabase(timeStamp);
    string jsonOutput = new JavaScriptSerializer().Serialize(output);
    return Json(output, JsonRequestBehavior.AllowGet);
}

When analyzing the code flow after calling queryDatabase, the timeStamp variable consistently appears as null. What could be the underlying cause of this issue?

Any insights or suggestions would be greatly appreciated!

javascript c#ajax asp.net-mvc

Answer 1

Answer №1

Here is a suggestion for your code:

$(document).ready(function () {
    setInterval(function () {
        $.ajax({
            type: "POST",
            url: '@Url.Action("GetChartData", "Plot")',
            dataType: 'json',
            data: {timeStamp: '04-15-2019 15:49:00'},
            success: function (result) {
                console.log(JSON.parse(result)
            }
        });
    }, 10000)
});

You can implement the following in the controller:

[HttpPost]
public JsonResult GetChartData()
{
    var timeStamp = Request["timeStamp"];
    var output = queryDatabase(timeStamp);
    var test = new JavaScriptSerializer().Serialize(output);
    return Json(output, JsonRequestBehavior.AllowGet);
}

Answer 2

Here is a suggestion for your code:

$(document).ready(function () {
    setInterval(function () {
        $.ajax({
            type: "POST",
            url: '@Url.Action("GetChartData", "Plot")',
            dataType: 'json',
            data: {timeStamp: '04-15-2019 15:49:00'},
            success: function (result) {
                console.log(JSON.parse(result)
            }
        });
    }, 10000)
});

You can implement the following in the controller:

[HttpPost]
public JsonResult GetChartData()
{
    var timeStamp = Request["timeStamp"];
    var output = queryDatabase(timeStamp);
    var test = new JavaScriptSerializer().Serialize(output);
    return Json(output, JsonRequestBehavior.AllowGet);
}

Answer 3

Answer №2

To ensure the controller reads a simple type from the request body, add the [FromBody] attribute:

 using System.Web.Http;
 [HttpPost]
 public JsonResult GetChartData([FromBody]string timeStamp)
 {
        string output = queryDatabase(timeStamp);
        string test = new JavaScriptSerializer().Serialize(output);
        return Json(output, JsonRequestBehavior.AllowGet);
 }

Answer 4

To ensure the controller reads a simple type from the request body, add the [FromBody] attribute:

 using System.Web.Http;
 [HttpPost]
 public JsonResult GetChartData([FromBody]string timeStamp)
 {
        string output = queryDatabase(timeStamp);
        string test = new JavaScriptSerializer().Serialize(output);
        return Json(output, JsonRequestBehavior.AllowGet);
 }

Answer 5

Answer №3

When making an Ajax call using the Post type and setting the dataType to JSON, ensure that you pass the data in the format of {title:data}. In your specific case, it should look like this:

$(document).ready(function () {
    setInterval(function () {
        $.ajax({
            type: "POST",
            url: '@Url.Action("GetChartData", "Plot")',
            dataType: 'json',
            data: {timeStamp: '04-15-2019 15:49:00'},
            success: function (result) {
                console.log(JSON.parse(result))
            }
        });
    }, 10000)

In your controller, the data will automatically be captured as an argument. Make sure to double-check the URL in your Ajax call for accuracy.

Answer 6

When making an Ajax call using the Post type and setting the dataType to JSON, ensure that you pass the data in the format of {title:data}. In your specific case, it should look like this:

$(document).ready(function () {
    setInterval(function () {
        $.ajax({
            type: "POST",
            url: '@Url.Action("GetChartData", "Plot")',
            dataType: 'json',
            data: {timeStamp: '04-15-2019 15:49:00'},
            success: function (result) {
                console.log(JSON.parse(result))
            }
        });
    }, 10000)

In your controller, the data will automatically be captured as an argument. Make sure to double-check the URL in your Ajax call for accuracy.

Ways to retrieve information from an ajax request within an MVC controller

Answer №1

Answer №2

Answer №3

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