MVC 5 选项空行 JavaScript

Question

$('#DepartmentCode').change(function () {
    var empName = $('#Employee_No');
    var department = $('#DepartmentCode').val();
    empName.empty();

    $.ajax({
        url: "/LeaveRequestEntry/GetEmployeesByDept",
        type: "POST",
        contentType: "application/json; charset=utf-8",
        dataType: "json",
        data: JSON.stringify({ ClassCode: department }),
        success: function (data) {
            $.each(data, function (index, option) {
                empName.append('<option value=' + option.Value + '>' + option.Text + '</option>');
            });
        }
    });
});

这是我的 JavaScript 代码。

   ViewBag.Employee = employeeRepository.GetAllByDepartment(ClassCode).Select(e => new SelectListItem { Text = e.Full_Name + "_" + e.No, Value = e.No });
    return Json(new SelectList(ViewBag.Employee, "Value", "Text"));

这是我的控制器部分。

    <div class="field">
        @Html.DropDownList("Department", new SelectList(ViewBag.DepartmentList, "Value", "Text"), LeaveRequestEntryRes.SelectableMessage, new { @class = "ui fluid dropdown", @id = "DepartmentCode" })
    </div>
    <div class="field">
        @Html.DropDownList("Employee_No", new SelectList(ViewBag.EmployeeList, "Value", "Text"), LeaveRequestEntryRes.SelectableMessage, new { @class = "ui fluid dropdown" })
    </div>

html部分有2个选项。我select一个部门的时候，那个部门的员工都来了。我的问题是其中之一总是 selected。我想点击 select。我该如何修复它，以便在我点击它时？？对不起我的英语不好。 :)

Answer 1

你能不能在成功的循环上面设置一个占位符选项？

例如：

empName.append('<option value="" selected>Select an option</option>');

// The loop to populate

MVC 5 选项空行 JavaScript

MVC 5 Option Empty Line With JavaScript

javascript

jquery

asp.net-mvc

model-view-controller