MVC4下拉列表选择的值

Question

我创建了一个下拉列表，显示所有日子（星期日）从上午9点到下午6点的预选时间为1小时的时间间隔，但我想在星期天搜索很多但是找不到帮助< / p>

这是我的代码

绑定下拉列表

public List<SelectListItem> StartTime()
 {
     List<SelectListItem> st = new List<SelectListItem>();
     st.Add(new SelectListItem() { Value = "12:00 AM", Text = "12:00 AM" });
     st.Add(new SelectListItem() { Value = "01:00 AM", Text = "01:00 AM" });
     st.Add(new SelectListItem() { Value = "02:00 AM", Text = "02:00 AM" });
     st.Add(new SelectListItem() { Value = "03:00 AM", Text = "03:00 AM" });
     st.Add(new SelectListItem() { Value = "04:00 AM", Text = "04:00 AM" });
     st.Add(new SelectListItem() { Value = "05:00 AM", Text = "05:00 AM" });
     st.Add(new SelectListItem() { Value = "06:00 AM", Text = "06:00 AM" });
     st.Add(new SelectListItem() { Value = "07:00 AM", Text = "07:00 AM" });
     st.Add(new SelectListItem() { Value = "08:00 AM", Text = "08:00 AM" });
     st.Add(new SelectListItem() { Value = "09:00 AM", Text = "09:00 AM", Selected=true });
     st.Add(new SelectListItem() { Value = "10:00 AM", Text = "10:00 AM" });
     st.Add(new SelectListItem() { Value = "11:00 AM", Text = "11:00 AM" });
     st.Add(new SelectListItem() { Value = "12:00 PM", Text = "12:00 PM" });
     st.Add(new SelectListItem() { Value = "01:00 PM", Text = "01:00 PM" });
     st.Add(new SelectListItem() { Value = "02:00 PM", Text = "02:00 PM" });
     st.Add(new SelectListItem() { Value = "03:00 PM", Text = "03:00 PM" });
     st.Add(new SelectListItem() { Value = "04:00 PM", Text = "04:00 PM" });
     st.Add(new SelectListItem() { Value = "05:00 PM", Text = "05:00 PM" });
     st.Add(new SelectListItem() { Value = "06:00 PM", Text = "06:00 PM" });
     st.Add(new SelectListItem() { Value = "07:00 PM", Text = "07:00 PM" });
     st.Add(new SelectListItem() { Value = "08:00 PM", Text = "08:00 PM" });
     st.Add(new SelectListItem() { Value = "09:00 PM", Text = "09:00 PM" });
     st.Add(new SelectListItem() { Value = "10:00 PM", Text = "10:00 PM" });
     st.Add(new SelectListItem() { Value = "11:00 PM", Text = "11:00 PM" });
     st.Add(new SelectListItem() { Value = "Holiday", Text = "Holiday" });
     return st;
 }

查看

TimeFunctions tf = new TimeFunctions();
    List<SelectListItem> ST = tf.StartTime();
@Html.DropDownListFor(model => model.MondayStart,ST)

现在我希望在页面加载时，然后在假日

中预先选择星期日的下拉列表

更新

我想要那样的视图

Answer 1

编辑：

您是否在每个下拉列表中使用@Html.DropDownListFor(model => model.MondayStart,ST)？

对于SundayStart和SundayEnd，它应该使用model.SundayStart或者任何ID为SelectedListItem，其值为“Holiday”

-

尝试明确设置所选值

dropdownlist.SlectedIndex = 9;

或

dropdownlist.SelectedValue = "Holiday";

Answer 2

您可以为下拉列表指定一个ID，然后使用jQuery进行更新。

查看

@Html.DropDownListFor(model => model.MondayStart,ST, new { id = "SundayStartDropdown" })

<强>的jQuery

<script>
    $(document).ready(function () {
        $('#SundayStartDropdown').val('Holiday');
    });
</script>

Answer 3

你可以这样做：

我的模特：

namespace MVCMusicStore.Models
{
    public class Login
    {
        [Required(AllowEmptyStrings = false, ErrorMessage = "Name is required")]
        public string Name { get; set; }

        [Required(AllowEmptyStrings = false, ErrorMessage = "User Name is required")]
        public string UserName { get; set; }

        [DataType(DataType.Password)]
        [Required(AllowEmptyStrings = false, ErrorMessage = "Password is required")]
        public string Password { get; set; }

        [DataType(DataType.Password)]
        [Required(AllowEmptyStrings = false, ErrorMessage = "Confirm Password is required")]
        public string ConfirmPassword { get; set; }

        public string CountryList { get; set; }

        public List<SelectListItem> Country
        {
            get;
            set;
        }

        public string SelectedCountry { get; set; }
        public Login()
        {
            Bindcountry();
        }

        public void Bindcountry()
        {
            List<SelectListItem> coutryList = new List<SelectListItem>();
            coutryList.Add(new SelectListItem { Text = "India", Value = "India" });
            coutryList.Add(new SelectListItem { Text = "USA", Value = "USA" });
            coutryList.Add(new SelectListItem { Text = "UK", Value = "UK"});
            coutryList.Add(new SelectListItem { Text = "Mexico", Value = "Mexico" });
            coutryList.Add(new SelectListItem { Text = "Germany", Value = "Germany", Selected = true });
            coutryList.Add(new SelectListItem { Text = "France", Value = "France" });


            this.Country = coutryList;
            SelectedCountry = "Mexico";

        }

    }
}

查看：

@Html.DropDownListFor(m => m.CountryList, new SelectList(Model.Country,"Value","Text",Model.SelectedCountry))

这将为您提供下拉列表中的选定项目