asp.net-mvc – 在mvc下拉列表中自动恢复

要求：我的视图页面上有一个下拉列表,显示了供应商列表.从下拉列表中选择供应商后,该页面将显示所选供应商的详细信息.默认情况下,我需要选择第一个供应商并显示其详细信息.我可以通过使用以下代码来完成此任务.

问题：不知道如何在MVC中完成autopostback = true.我需要在下拉列表中显示所选供应商的详细信息.

我正在使用ASP.net 4.0,MVC3,Entity Framework 4.0.这是我的代码：

[AcceptVerbs("POST")]
    public ActionResult SearchResult(FormCollection collection)
    {
        try
        {
            string vendorName = collection["searchItem"].ToString();

            vendorName = vendorName.Trim();
            List<vendor> vendorList = Queries.compiledvendorQuery(dbContext,vendorName).ToList<vendor>();

            if(vendorList.Count() == 0)
                return View("EmptySearch");

            List<SelectListItem> vendorSelectList = new List<SelectListItem>();
            foreach (vendor vendor in vendorList)
            {
                vendorSelectList.Add(new SelectListItem
                {
                    Text = vendor.vendorName.ToString(),Value = vendor.vendorId.ToString()
                });
            }

            vendor selectedvendor = vendorList[0];

            vendorDetails vendorDeatils = Queries.compiledvendorDetailsQuery(dbContext,selectedvendor.vendorId.ToString()).FirstOrDefault();

            vendorResult vendorResult = new vendorResult();

            vendorResult.vendorSelectList = vendorSelectList;
            vendorResult.vendorDetails = vendorDeatils;

            return View(vendorResult);
        }
        catch (Exception e)
        {
            return View("EmptySearch");
        }
    }


public class vendorResult
{
    public List<SelectListItem> vendorSelectList { get; set; }
    public vendorDetails vendorDetails {get; set;}
}


public class vendorDetails
{
    public string vendorId { get; set; }
    public string vendorName { get; set; }
    public string address1 { get; set; }
    public string address2 { get; set; }
    public string address3 { get; set; }
    public string city { get; set; }
    public string state { get; set; }
    public string zip { get; set; }
    public decimal noteIndex { get; set; }
    public string comment1 { get; set; }
    public string comment2 { get; set; }
    public string phone { get; set; }
    public string interPhone { get; set; }
    public string fax { get; set; }
    public string interFax { get; set; }
}

编辑：定义我的下拉列表的代码.

@model Keletools.Models.vendorResult

@{
    ViewBag.Title = "vendor LookUp Tool";
    Layout = "~/Views/Shared/_ResultLayout.cshtml";
}

<h2>vendor Details</h2>

<p> Select a vendor to display details:</p>

@Html.DropDownList("vendorList",@Model.vendorSelectList,null,new {target="_self"})

@using (Html.BeginForm("SearchResult","vendorLookUp"))
{
   <div class="margin-10-top" >
    <table id= "OrderDetail" class="OrderDetail">
    <tr class="OrderDetail">
        <td class="PropertyName">vendor Id:</td>
        <td class="PropertyValue">@Model.vendorDetails.vendorId.ToString().Trim()</td>
    </tr>
    <tr class="OrderDetail">
        <td class="PropertyName">vendor Name:</td>
        <td class="PropertyValue">@Model.vendorDetails.vendorName.ToString().Trim()</td>
    </tr>
    @{
                             string address = @Model.vendorDetails.address1.ToString().Trim();
                             address = address + "\n";
                             address = address + @Model.vendorDetails.address2.ToString().Trim();
                             address = address + "\n";
                             address = address + @Model.vendorDetails.address3.ToString().Trim();

        <tr class="OrderDetail">
            <td class="PropertyName">Address</td>
            <td class="PropertyValue">@address.TrimEnd()</td>
        </tr>
    }
    @{
                                 string city = @Model.vendorDetails.city.ToString().TrimEnd();
                                 city = city + ",";
                                 city = city + @Model.vendorDetails.state.ToString().Trim();
                                 city = city + " ";
                                 city = city + @Model.vendorDetails.zip.ToString().Trim();

        <tr class="OrderDetail">
            <td class="PropertyName">&nbsp;</td>
            <td class="PropertyValue">@city</td>
        </tr>

                                 string phoneNumber = null;
                                 if (!string.IsNullOrEmpty(@Model.vendorDetails.phone.ToString().Trim()))
                                 {
                                     phoneNumber = @Model.vendorDetails.phone.ToString().TrimEnd().Substring(0,3);
                                     phoneNumber = phoneNumber + "-";
                                     phoneNumber = phoneNumber + @Model.vendorDetails.phone.ToString().TrimEnd().Substring(3,3);
                                     phoneNumber = phoneNumber + "-";
                                     phoneNumber = phoneNumber + @Model.vendorDetails.phone.ToString().TrimEnd().Substring(6,4);
                                     if (@Model.vendorDetails.phone.ToString().Trim().Length > 10)
                                     {
                                         phoneNumber = phoneNumber + " Ext: ";
                                         phoneNumber = phoneNumber + @Model.vendorDetails.phone.ToString().TrimEnd().Substring(10);
                                     }
                                 }

        <tr class="OrderDetail">
            <td class="PropertyName">Phone Number:</td>
            <td class="PropertyValue">@phoneNumber</td>
        </tr>
                                 phoneNumber = null;
                                 if (!string.IsNullOrEmpty(@Model.vendorDetails.fax.ToString().Trim()))
                                 {
                                     phoneNumber = @Model.vendorDetails.fax.ToString().TrimEnd().Substring(0,3);
                                     phoneNumber = phoneNumber + "-";
                                     phoneNumber = phoneNumber + @Model.vendorDetails.fax.ToString().TrimEnd().Substring(3,3);
                                     phoneNumber = phoneNumber + "-";
                                     phoneNumber = phoneNumber + @Model.vendorDetails.fax.ToString().TrimEnd().Substring(6,4);
                                     if (@Model.vendorDetails.fax.ToString().Trim().Length > 10)
                                     {
                                         phoneNumber = phoneNumber + " Ext: ";
                                         phoneNumber = phoneNumber + @Model.vendorDetails.fax.ToString().TrimEnd().Substring(10);
                                     }
                                 }

        <tr class="OrderDetail">
            <td class="PropertyName">Fax:</td>
            <td class="PropertyValue">@phoneNumber</td>
        </tr>
                                 phoneNumber = null;
                                 if (!string.IsNullOrEmpty(@Model.vendorDetails.interPhone.ToString().Trim()))
                                 {

                                     phoneNumber = @Model.vendorDetails.interPhone.ToString().TrimEnd().Substring(0,3);
                                     phoneNumber = phoneNumber + "-";
                                     phoneNumber = phoneNumber + @Model.vendorDetails.interPhone.ToString().TrimEnd().Substring(3,3);
                                     phoneNumber = phoneNumber + "-";
                                     phoneNumber = phoneNumber + @Model.vendorDetails.interPhone.ToString().TrimEnd().Substring(6,4);
                                     if (@Model.vendorDetails.interPhone.ToString().Trim().Length > 10)
                                     {
                                         phoneNumber = phoneNumber + " Ext: ";
                                         phoneNumber = phoneNumber + @Model.vendorDetails.interPhone.ToString().TrimEnd().Substring(10);
                                     }
                                 }

        <tr class="OrderDetail">
            <td class="PropertyName">International Phone:</td>
            <td class="PropertyValue">@phoneNumber</td>
        </tr>
                                 phoneNumber = null;
                                 if (!string.IsNullOrEmpty(@Model.vendorDetails.interFax.ToString().Trim()))
                                 {
                                     phoneNumber = @Model.vendorDetails.interFax.ToString().TrimEnd().Substring(0,3);
                                     phoneNumber = phoneNumber + "-";
                                     phoneNumber = phoneNumber + @Model.vendorDetails.interFax.ToString().TrimEnd().Substring(3,3);
                                     phoneNumber = phoneNumber + "-";
                                     phoneNumber = phoneNumber + @Model.vendorDetails.interFax.ToString().TrimEnd().Substring(6,4);
                                     if (@Model.vendorDetails.interFax.ToString().Trim().Length > 10)
                                     {
                                         phoneNumber = phoneNumber + " Ext: ";
                                         phoneNumber = phoneNumber + @Model.vendorDetails.interFax.ToString().TrimEnd().Substring(10);
                                     }
                                 }

        <tr class="OrderDetail">
            <td class="PropertyName">International Fax:</td>
            <td class="PropertyValue">@phoneNumber</td>
        </tr>
        }
      <tr class="OrderDetail">
        <td class="PropertyName">Comment 1:</td>
        <td class="PropertyValue">@Model.vendorDetails.comment1.ToString().TrimEnd() < /td>
    < /tr>
    <tr class="OrderDetail">
        <td class="PropertyName">Comment 2:</td>
        <td class="PropertyValue">@Model.vendorDetails.comment2.ToString().Trim()</td>
    < /tr>

< /table> 
< /div>
}

解决方法

MVC中没有Autopostback = true.你必须自己连线.你可以使用jQuery做这样的事情：

$("#idOfMyDropDownList").change(function () {
    // Handle the change event,such as fire off an ajax request.
});

原文地址：https://www.jb51.cc/aspnet/247107.html