从DropDownList中选择一个值以能够填写字段 [英] Selecting a value from a DropDownList to be able to fill in fields

问题描述

我已经用以下命令填充了一个DropDownList: 型号:

I have populated a DropDownList with the following: Model:

namespace VAGTC.Models
{
    using System;
    using System.Collections.Generic;

    public partial class Organization
    {

        public int OrganizationID { get; set; }
        public string Name { get; set; }

}

控制器:

public ActionResult Index()
{

    ViewBag.DropOrgID = ddp.OrganizationList();
    return View();
}

ViewModel:

ViewModel:

namespace VAGTC.ViewModels
{
    public class OrgDrop
    {
        public Organization organization { get; set; }
        public IEnumerable<Organization> Organizations {get; set;}
    }
}

助手:

    public class DropDownPopulatorController : Controller
    {
        private VAGTCEntities db = new VAGTCEntities();

        public SelectList OrganizationList(int selectedOrg = 0)
        {
            var orgQuery = from d in db.Organizations
                           orderby d.Name
                           select d;
            return new SelectList(orgQuery, "OrganizationID", "Name", selectedOrg);
        }
    }

然后，我只需在索引视图中放入"@ Html.DropDownList("DropOrgID")"即可.

Then, I simply put "@Html.DropDownList("DropOrgID")" in my index view.

我要做的是通过根据DropDownList中选择的内容从数据库中获取数据来填充文本框(尚未实现).但是我无法弄清楚-我感觉好像是要错误地创建和填充下拉列表.

What I have to accomplish is filling in text boxes (which I have not yet implemented) by fetching data from my database depending on what is selected in the DropDownList. But I could not figure this out - I feel as if I went about creating and populating the drop down incorrectly.

我是MVC的新手，正在慢慢学习！我正在逐步进行！现在专注于仅获取SelectedValue.我尝试了多种创建和填充下拉菜单的方法，但这是对我有用的方法.我查找了用于获取SelectedValue的教程，但它似乎与我进行下拉的方式不兼容.具体来说，我找到了

I am new to MVC and I am slowly learning! I am taking it step-by-step! Focusing now on just fetching a SelectedValue. I have tried many ways of creating and populating a drop down but this is the one that worked for me. I looked up tutorials for fetching the SelectedValue but it doesn't seem to work with the way I made the drop down. Specifcally, I found the Cascading DropDownList but I could not get it to work with my drop down.

所以我的问题是:如何获取一个SelectedValue，然后将该值传递给一个控制器，然后再传递一个模型(我认为那是它的工作原理?)，以便根据选择来选择数据.

So my question: How does one go about fetching a SelectedValue and then pass the value along to a controller and then a model (I think that would be how it works?) to select data based on the selection.

我们非常感谢您的帮助.

Any help is extremely appreciated.

供参考:这是我的下拉菜单

谢谢！

推荐答案

您可以在Controller中的后操作"中以以下方式获取下拉列表的选定值，

You can Get Drop-down's selected value in Post Action in Controller as,

[HttpPost]
public ActionResult Index(FormCollection frm)
{
   var selectedValue = frm["DropOrgID"];
   return View();
}

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