Why isn't my List<string> being retrieved from the MVC Controller in an $ajax request?

I am attempting to generate customized lists in my cshtml file through an ajax request.

.ajax({
        type: "GET",
        cache: false,
        url: "@Url.Action("getValidationLists")",
        contentType: "application/json",
        dataType: "json",
        success: function (result) {                
            var list = result.list;
            $.each(list, function (index, value) {
                alert(value);
            });
        }
    });       

In order to achieve this, the Controller fetches the data, organizes it into a List, and sends it back to my cshtml file in json format. Here is the controller method responsible:

[HttpGet]
[Authorize]
public JsonResult getValidationLists()
{
    List<List<String>> validList = new List<List<String>>();
    List<UIReferenceData> results = AddErrorsToModelState <List<UIReferenceData>>(_StaticDataServiceAgent.GetAllAssetTypes());
    for (int i = 0; i < results.Count; i++)
    {
        List<String> resultList = new List<String>();
        string id = results[i].ID.ToString();
        string name = results[i].Name;
        resultList.Add(id);
        resultList.Add(name);
        validList.Add(resultList);
    }
    return Json(new
    {
        validList = validList
    }, JsonRequestBehavior.AllowGet);
}

Despite trying multiple variations, the script never reaches the point of executing the alert(value); line. What could I be overlooking?

Answer №1

The property name inconsistency in your action result is causing an issue:

var list = result.list;

It should be corrected to:

var list = result.validList;

Furthermore, you are returning a List<List<String>> instead of a List<String>.

To resolve the issue, both the property name and return type need to be adjusted.

Answer №2

When examining the JSON response generated by your action method, it appears like this:

{
    "validList": [      
        ["1", "SomeText"],
        ["2", "SomeText"],
        ["3", " SomeText"]
    ]
}

The response includes a property called validList, which is an array where each item consists of another array with 2 elements.

To process this data successfully, use the following code snippet:

 success: function (result) {           
     $.each(result.validList, function (index, value) {
       console.log(value[0]);
       console.log(value[1]);
    });
 }

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