Why Does My ASP.NET MVC $.post Request Return Unexpectedly Formatted Strings for jqGrid Dropdowns?

String formatting issues with ASP.NET MVC and jqGrid drop-down menu

Overview

When using jqGrid to dynamically populate the drop-down menu for data editing, additional "undefined" items will appear in the drop-down menu. This issue stems from the string format used to populate the dropdown menu values.

Problem Analysis

jqGrid requires the drop-down menu value format to be as follows:

<code>value: "FE:FedEx; IN:InTime; TN:TNT"</code>

However, the code in the ASP.NET MVC action generates the string using sb.ToString(), which adds unnecessary quotes around the value:

<code>value: ""ID: One;ID: Two;ID: Three;ID: Four;ID: Five;""</code>

Solution

Method 1: Use dataUrl

In order to solve this problem, it is recommended to use the dataUrl attribute of editoptions or searchoptions in jqGrid. This allows you to specify a URL that returns results in the desired format:

<code>{ name: 'destinations', ditable: true, edittype:'select',
  editoptions: { dataUrl:'<%= Url.Action("GetDestinationList","Home") %>' }
}</code>

In the controller, the GetDestinationList operation should return a JSON array containing the dropdown menu values:

<code>public JsonResult GetDestinationList() {
    List<string> allDestinations = GetAllDestinations();
    Json(allDestinations, JsonRequestBehavior.AllowGet);
}</code>

Method 2: Use the buildSelect function

If dataUrl is not available, you can use the buildSelect function to format the drop-down menu value:

<code class="language-javascript">                 buildSelect: function(data) {
                     var s = '';
                     if (response && response.length) {
                         for (var i = 0, l=response.length; i<l ; i++) {
                             var ri = response[i];
                             s += ''+ri+'';
                         }
                     }
                     return s + "";
                 }</code>

This function receives the response data from the server and returns a string in the required format.

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