在AJAX调用MVC期间，DDL无法更改

我希望在ajax调用期间更改位置的值，从而节省用户手动更改值的时间，我已尝试但显然不起作用（请参阅下面的代码），关于我去哪里的任何想法错误？

_CameraInfo.cshtml（局部视图）

@model JobTracker.Models.Job 
Edit and Confirm
 @using (Html.BeginForm()) { @Html.ValidationSummary(true) 
 
Job
 @Html.HiddenFor(model => model.JobID) @Html.HiddenFor(model => model.OrderID) 
 @Html.LabelFor(model => model.LocationID, "Location") 
 
 @Html.DropDownList("LocationID", null, new {id ="Location" }) @Html.ValidationMessageFor(model => model.LocationID) 

 
 @Html.LabelFor(model => model.HighPriority) 
 
 @Html.DropDownListFor(model => model.HighPriority, new SelectList( new[] { new { Value = "Yes", Text = "Yes" }, new { Value = "No", Text = "No" }, }, "Value", "Text", Model )) @Html.ValidationMessageFor(model => model.HighPriority) 

 
 @Html.LabelFor(model => model.Comments) 
 
 @Html.TextAreaFor(model => model.Comments) @Html.ValidationMessageFor(model => model.Comments) 

 
 @Html.LabelFor(model => model.Status) 
 
 @Html.DropDownListFor(model => model.Status, new SelectList( new[] { new { Value = "In Progress", Text = "In Progress" }, new { Value = "Completed", Text = "Completed" }, new { Value = "Not Started", Text = "Not Started" }, new { Value = "Stopped", Text = "Stopped" }, }, "Value", "Text", Model )) @Html.ValidationMessageFor(model => model.Status) 

 
  
 
 } 

AJAX电话

  $(document).ready(function () { $('#qr-number').on('change', function () { var ddl = $('#Location'); var value = "cleanroom"; $.ajax({ type: "Get", url: '/CameraInfo/Edit', data: { ID: $('#qr-number').val() }, success: function (response) { ddl.val(value); $('#Sample').html(response); }, error: function (response) { if (response.responseText != "") { alert(response.responseText); alert("Some thing wrong.."); } } }); }); }); }); 

顺便提一下，DDL由模型数据填充。

我认为它在成功期间由于某种原因没有改变，也许是因为视图没有完全加载？

如果您需要任何进一步的信息，请告诉我:)

Answer 1

几件事要检查。 确保渲染下拉列表中的ID为Location。 一些帮助者将覆盖该更改。 接下来请确保您的下拉列表中有一个值为“cleanroom”的选项。 如果您尝试按文字设置，请参阅此处