web-dev-qa-db-ja.com

MVCで国と州/省の選択リストを作成する方法

こんにちは、MVCは初めてで、asp ..

MVCでフォームを作成したい。いくつかの例の助けを借りて、TextBoxを作成できますが、選択リストの作成方法がわかりません。

MVCで選択リストを実装するための多くの例を検索しようとしましたが、理解できません。

HTMLで半分、MVCで半分コーディングされたフォームがあります。

ここに私のコードがあります：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

namespace MedAvail.Applications.MedProvision.Web.Models
{
    public class AddressViewModel
    {
        public string Street1 { get; set; }
        public string Street2 { get; set; }
        public string City { get; set; }
        public string Province { get; set; }
        public string Country { get; set; }
        public string PostalCode { get; set; }
        public string PhoneNumber { get; set; }
    }
}




<form id="locationInfo">
    <h1>Location Information</h1>
    <table width="80%" id="locInfo">
        <colgroup>
            <col width="20%" />
            <col />
        </colgroup>
        <tr>
            <th>@Html.Label("Country")</th>
            <td>
                <select required="">
                    <option>Select Country</option>
                    <option>Canada</option>
                    <option>United States</option>
                </select>
                <span class="required">*</span>
            </td>
        </tr>
        <tr>
            <th>@Html.LabelFor(x=>x.State)</th>
            <td>
                <select required="">
                    <option>Select State</option>
                    <option>State 1</option>
                    <option>State 2</option>
                    <option>State 3</option>
                        ...............
                </select><span class="required">*</span></td>
        </tr>
        <tr>
            <th>@Html.LabelFor(x=>x.PostalCode)</th>
            <td>@Html.TextBoxFor(x=>x.PostalCode)<span class="required">*</span></td>
        </tr>
        <tr>
            <th>@Html.LabelFor(x=>x.City)</th>
            <td>@Html.TextBoxFor(x=>x.City)<span class="required">*</span></td>
        </tr>

        <tr>
            <th>@Html.LabelFor(x=>x.StreetAddress1)</th>
            <td>@Html.TextBoxFor(x=>x.StreetAddress1)<span class="required">*</span></td>
        </tr>
        <tr>
            <th>@Html.LabelFor(x=>x.StreetAddress2)</th>
            <td>@Html.TextBoxFor(x=>x.StreetAddress2)</td>
        </tr>
        <tr>
            <th>@Html.LabelFor(x=>x.PhoneNumber)</th>
            <td>@Html.TextBoxFor(x=>x.PhoneNumber)</td>
        </tr>

    </table>


    <div role="button" class="marginTop50 marginBottom">
        <input type="button" id="step3Back" value="Back" class="active" />
        <input type="button" id="step3confirmNext" value="Next" class="active marginLeft50" />
    </div>
</form>

この種のフォームの選択リストを作成する方法を教えてください。

c#asp.netasp.net-mvcasp.net-mvc-4
26
UID

皆さん、ありがとうございました！ MVCごとに選択リストをロードできるようになりました。私の作業コードは次のとおりです。

ビューのHTML + MVCコード：-

    <tr>
        <th>@Html.Label("Country")</th>
        <td>@Html.DropDownListFor(x =>x.Province,SelectListItemHelper.GetCountryList())<span class="required">*</span></td>
    </tr>
    <tr>
        <th>@Html.LabelFor(x=>x.Province)</th>
        <td>@Html.DropDownListFor(x =>x.Province,SelectListItemHelper.GetProvincesList())<span class="required">*</span></td>
    </tr>

「UTIL」フォルダーの下にコントローラーを作成：コード：-

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;

namespace MedAvail.Applications.MedProvision.Web.Util
{
    public class SelectListItemHelper
    {
        public static IEnumerable<SelectListItem> GetProvincesList()
        {
            IList<SelectListItem> items = new List<SelectListItem>
            {
                new SelectListItem{Text = "California", Value = "B"},
                new SelectListItem{Text = "Alaska", Value = "B"},
                new SelectListItem{Text = "Illinois", Value = "B"},
                new SelectListItem{Text = "Texas", Value = "B"},
                new SelectListItem{Text = "Washington", Value = "B"}

            };
            return items;
        }


        public static IEnumerable<SelectListItem> GetCountryList()
        {
            IList<SelectListItem> items = new List<SelectListItem>
            {
                new SelectListItem{Text = "United States", Value = "B"},
                new SelectListItem{Text = "Canada", Value = "B"},
                new SelectListItem{Text = "United Kingdom", Value = "B"},
                new SelectListItem{Text = "Texas", Value = "B"},
                new SelectListItem{Text = "Washington", Value = "B"}

            };
            return items;
        }


    }
}

そして、その動作中のクール今:-)

ありがとうございました！！

17
UID
public static List<SelectListItem> States = new List<SelectListItem>()
    {
        new SelectListItem() {Text="Alabama", Value="AL"},
        new SelectListItem() { Text="Alaska", Value="AK"},
        new SelectListItem() { Text="Arizona", Value="AZ"},
        new SelectListItem() { Text="Arkansas", Value="AR"},
        new SelectListItem() { Text="California", Value="CA"},
        new SelectListItem() { Text="Colorado", Value="CO"},
        new SelectListItem() { Text="Connecticut", Value="CT"},
        new SelectListItem() { Text="District of Columbia", Value="DC"},
        new SelectListItem() { Text="Delaware", Value="DE"},
        new SelectListItem() { Text="Florida", Value="FL"},
        new SelectListItem() { Text="Georgia", Value="GA"},
        new SelectListItem() { Text="Hawaii", Value="HI"},
        new SelectListItem() { Text="Idaho", Value="ID"},
        new SelectListItem() { Text="Illinois", Value="IL"},
        new SelectListItem() { Text="Indiana", Value="IN"},
        new SelectListItem() { Text="Iowa", Value="IA"},
        new SelectListItem() { Text="Kansas", Value="KS"},
        new SelectListItem() { Text="Kentucky", Value="KY"},
        new SelectListItem() { Text="Louisiana", Value="LA"},
        new SelectListItem() { Text="Maine", Value="ME"},
        new SelectListItem() { Text="Maryland", Value="MD"},
        new SelectListItem() { Text="Massachusetts", Value="MA"},
        new SelectListItem() { Text="Michigan", Value="MI"},
        new SelectListItem() { Text="Minnesota", Value="MN"},
        new SelectListItem() { Text="Mississippi", Value="MS"},
        new SelectListItem() { Text="Missouri", Value="MO"},
        new SelectListItem() { Text="Montana", Value="MT"},
        new SelectListItem() { Text="Nebraska", Value="NE"},
        new SelectListItem() { Text="Nevada", Value="NV"},
        new SelectListItem() { Text="New Hampshire", Value="NH"},
        new SelectListItem() { Text="New Jersey", Value="NJ"},
        new SelectListItem() { Text="New Mexico", Value="NM"},
        new SelectListItem() { Text="New York", Value="NY"},
        new SelectListItem() { Text="North Carolina", Value="NC"},
        new SelectListItem() { Text="North Dakota", Value="ND"},
        new SelectListItem() { Text="Ohio", Value="OH"},
        new SelectListItem() { Text="Oklahoma", Value="OK"},
        new SelectListItem() { Text="Oregon", Value="OR"},
        new SelectListItem() { Text="Pennsylvania", Value="PA"},
        new SelectListItem() { Text="Rhode Island", Value="RI"},
        new SelectListItem() { Text="South Carolina", Value="SC"},
        new SelectListItem() { Text="South Dakota", Value="SD"},
        new SelectListItem() { Text="Tennessee", Value="TN"},
        new SelectListItem() { Text="Texas", Value="TX"},
        new SelectListItem() { Text="Utah", Value="UT"},
        new SelectListItem() { Text="Vermont", Value="VT"},
        new SelectListItem() { Text="Virginia", Value="VA"},
        new SelectListItem() { Text="Washington", Value="WA"},
        new SelectListItem() { Text="West Virginia", Value="WV"},
        new SelectListItem() { Text="Wisconsin", Value="WI"},
        new SelectListItem() { Text="Wyoming", Value="WY"}
    };

その方法は、このメソッドをクラスに入れてから、ビューからクラスを呼び出すことです

@Html.DropDownListFor(x => x.State, Class.States)
65
Matt Bodily

これありがとう

私がやったことは次のとおりです。

1.UtilsフォルダーにExtensions.csファイルを作成しました。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;

namespace Web.ProjectName.Utils
{
    public class Extensions
    {
        public static IEnumerable<SelectListItem> GetStatesList()
        {
            IList<SelectListItem> states = new List<SelectListItem>
            {
                new SelectListItem() {Text="Alabama", Value="AL"},
                new SelectListItem() { Text="Alaska", Value="AK"},
                new SelectListItem() { Text="Arizona", Value="AZ"},
                new SelectListItem() { Text="Arkansas", Value="AR"},
                new SelectListItem() { Text="California", Value="CA"},
                new SelectListItem() { Text="Colorado", Value="CO"},
                new SelectListItem() { Text="Connecticut", Value="CT"},
                new SelectListItem() { Text="District of Columbia", Value="DC"},
                new SelectListItem() { Text="Delaware", Value="DE"},
                new SelectListItem() { Text="Florida", Value="FL"},
                new SelectListItem() { Text="Georgia", Value="GA"},
                new SelectListItem() { Text="Hawaii", Value="HI"},
                new SelectListItem() { Text="Idaho", Value="ID"},
                new SelectListItem() { Text="Illinois", Value="IL"},
                new SelectListItem() { Text="Indiana", Value="IN"},
                new SelectListItem() { Text="Iowa", Value="IA"},
                new SelectListItem() { Text="Kansas", Value="KS"},
                new SelectListItem() { Text="Kentucky", Value="KY"},
                new SelectListItem() { Text="Louisiana", Value="LA"},
                new SelectListItem() { Text="Maine", Value="ME"},
                new SelectListItem() { Text="Maryland", Value="MD"},
                new SelectListItem() { Text="Massachusetts", Value="MA"},
                new SelectListItem() { Text="Michigan", Value="MI"},
                new SelectListItem() { Text="Minnesota", Value="MN"},
                new SelectListItem() { Text="Mississippi", Value="MS"},
                new SelectListItem() { Text="Missouri", Value="MO"},
                new SelectListItem() { Text="Montana", Value="MT"},
                new SelectListItem() { Text="Nebraska", Value="NE"},
                new SelectListItem() { Text="Nevada", Value="NV"},
                new SelectListItem() { Text="New Hampshire", Value="NH"},
                new SelectListItem() { Text="New Jersey", Value="NJ"},
                new SelectListItem() { Text="New Mexico", Value="NM"},
                new SelectListItem() { Text="New York", Value="NY"},
                new SelectListItem() { Text="North Carolina", Value="NC"},
                new SelectListItem() { Text="North Dakota", Value="ND"},
                new SelectListItem() { Text="Ohio", Value="OH"},
                new SelectListItem() { Text="Oklahoma", Value="OK"},
                new SelectListItem() { Text="Oregon", Value="OR"},
                new SelectListItem() { Text="Pennsylvania", Value="PA"},
                new SelectListItem() { Text="Rhode Island", Value="RI"},
                new SelectListItem() { Text="South Carolina", Value="SC"},
                new SelectListItem() { Text="South Dakota", Value="SD"},
                new SelectListItem() { Text="Tennessee", Value="TN"},
                new SelectListItem() { Text="Texas", Value="TX"},
                new SelectListItem() { Text="Utah", Value="UT"},
                new SelectListItem() { Text="Vermont", Value="VT"},
                new SelectListItem() { Text="Virginia", Value="VA"},
                new SelectListItem() { Text="Washington", Value="WA"},
                new SelectListItem() { Text="West Virginia", Value="WV"},
                new SelectListItem() { Text="Wisconsin", Value="WI"},
                new SelectListItem() { Text="Wyoming", Value="WY"}
            };
            return states;
        }
    }
}

2.私のモデルでは、状態が省略されます（例：「AL」、「NY」など）：

using System.ComponentModel;
using System.ComponentModel.DataAnnotations;

namespace Web.ProjectName.Models
{
    public class ContactForm
    {

        ...

        [Required]
        [Display(Name = "State")]
        [RegularExpression("[A-Z]{2}")]
        public string State { get; set; }

        ...

    }
}

2.私の見解では、それを参照しました：

  @model Web.ProjectName.Models.ContactForm

  ...

  @Html.LabelFor(x => x.State, new { @class = "form-label" })
  @Html.DropDownListFor(x => x.State, Web.ProjectName.Utils.Extensions.GetStatesList(), new { @class = "form-control" })

  ...
9
Jordan McArdle

モデルの設計：

Public class ModelName
{
    ...// Properties
    public IEnumerable<SelectListItem> ListName { get; set; }
}

Listを作成してControllerのモデルにバインドします。

    public ActionResult Index(ModelName model)
    {
        var items = // Your List of data
        model.ListName = items.Select(x=> new SelectListItem() {
                    Text = x.prop,
                    Value = x.prop2
               });
    }

あなたにビュー：

@Html.DropDownListFor(m => Model.prop2,Model.ListName)
5
Jatin patil

これを行うには多くの方法があります... #NetCoreではLib ..を使用します。

    using System;
    using System.Collections.Generic;
    using System.Linq; // only required when .AsEnumerable() is used
    using System.ComponentModel.DataAnnotations;
    using Microsoft.AspNetCore.Mvc.Rendering;

型...

namespace MyProject.Models
{
  public class MyModel
  {
    [Required]
    [Display(Name = "State")]
    public string StatePick { get; set; }
    public string state { get; set; }
    [StringLength(35, ErrorMessage = "State cannot be longer than 35 characters.")]
    public SelectList StateList { get; set; }
  }
}

コントローラ...

namespace MyProject.Controllers
{
    /// <summary>
    /// create SelectListItem from strings
    /// </summary>
    /// <param name="isValue">defaultValue is SelectListItem.Value is true, SelectListItem.Text if false</param>
    /// <returns></returns>
    private SelectListItem newItem(string value, string text, string defaultValue = "", bool isValue = false)
    {
        SelectListItem ss = new SelectListItem();
        ss.Text = text;
        ss.Value = value;

        // select default by Value or Text
        if (isValue && ss.Value == defaultValue || !isValue && ss.Text == defaultValue)
        {
            ss.Selected = true;
        }

        return ss;
    }

    /// <summary>
    /// this pulls the state name from _context and sets it as the default for the selectList
    /// </summary>
    /// <param name="myState">sets default value for list of states</param>
    /// <returns></returns>
    private SelectList getStateList(string myState = "")
    {
        List<SelectListItem> states = new List<SelectListItem>();
        SelectListItem chosen = new SelectListItem();

        // set default selected state to OHIO
        string defaultValue = "OH";
        if (!string.IsNullOrEmpty(myState))
        {
            defaultValue = myState;
        }

        try
        {
            states.Add(newItem("AL", "Alabama", defaultValue, true));
            states.Add(newItem("AK", "Alaska", defaultValue, true));
            states.Add(newItem("AZ", "Arizona", defaultValue, true));
            states.Add(newItem("AR", "Arkansas", defaultValue, true));
            states.Add(newItem("CA", "California", defaultValue, true));
            states.Add(newItem("CO", "Colorado", defaultValue, true));
            states.Add(newItem("CT", "Connecticut", defaultValue, true));
            states.Add(newItem("DE", "Delaware", defaultValue, true));
            states.Add(newItem("DC", "District of Columbia", defaultValue, true));
            states.Add(newItem("FL", "Florida", defaultValue, true));
            states.Add(newItem("GA", "Georgia", defaultValue, true));
            states.Add(newItem("HI", "Hawaii", defaultValue, true));
            states.Add(newItem("ID", "Idaho", defaultValue, true));
            states.Add(newItem("IL", "Illinois", defaultValue, true));
            states.Add(newItem("IN", "Indiana", defaultValue, true));
            states.Add(newItem("IA", "Iowa", defaultValue, true));
            states.Add(newItem("KS", "Kansas", defaultValue, true));
            states.Add(newItem("KY", "Kentucky", defaultValue, true));
            states.Add(newItem("LA", "Louisiana", defaultValue, true));
            states.Add(newItem("ME", "Maine", defaultValue, true));
            states.Add(newItem("MD", "Maryland", defaultValue, true));
            states.Add(newItem("MA", "Massachusetts", defaultValue, true));
            states.Add(newItem("MI", "Michigan", defaultValue, true));
            states.Add(newItem("MN", "Minnesota", defaultValue, true));
            states.Add(newItem("MS", "Mississippi", defaultValue, true));
            states.Add(newItem("MO", "Missouri", defaultValue, true));
            states.Add(newItem("MT", "Montana", defaultValue, true));
            states.Add(newItem("NE", "Nebraska", defaultValue, true));
            states.Add(newItem("NV", "Nevada", defaultValue, true));
            states.Add(newItem("NH", "New Hampshire", defaultValue, true));
            states.Add(newItem("NJ", "New Jersey", defaultValue, true));
            states.Add(newItem("NM", "New Mexico", defaultValue, true));
            states.Add(newItem("NY", "New York", defaultValue, true));
            states.Add(newItem("NC", "North Carolina", defaultValue, true));
            states.Add(newItem("ND", "North Dakota", defaultValue, true));
            states.Add(newItem("OH", "Ohio", defaultValue, true));
            states.Add(newItem("OK", "Oklahoma", defaultValue, true));
            states.Add(newItem("OR", "Oregon", defaultValue, true));
            states.Add(newItem("PA", "Pennsylvania", defaultValue, true));
            states.Add(newItem("RI", "Rhode Island", defaultValue, true));
            states.Add(newItem("SC", "South Carolina", defaultValue, true));
            states.Add(newItem("SD", "South Dakota", defaultValue, true));
            states.Add(newItem("TN", "Tennessee", defaultValue, true));
            states.Add(newItem("TX", "Texas", defaultValue, true));
            states.Add(newItem("UT", "Utah", defaultValue, true));
            states.Add(newItem("VT", "Vermont", defaultValue, true));
            states.Add(newItem("VA", "Virginia", defaultValue, true));
            states.Add(newItem("WA", "Washington", defaultValue, true));
            states.Add(newItem("WV", "West Virginia", defaultValue, true));
            states.Add(newItem("WI", "Wisconsin", defaultValue, true));
            states.Add(newItem("WY", "Wyoming", defaultValue, true));

            foreach (SelectListItem state in states)
            {
                if (state.Selected)
                {
                    chosen = state;
                    break;
                }
            }
        }
        catch (Exception err)
        {
            string ss = "ERR!   " + err.Source + "   " + err.GetType().ToString() + "\r\n" + err.Message.Replace("\r\n", "   ");
            ss = this.sendError("Online getStateList Request", ss, _errPassword);
            // return error
        }

        // .AsEnumerable() is not required in the pass.. it is an extension of Linq
        SelectList myList = new SelectList(states.AsEnumerable(), "Value", "Text", chosen);

        object val = myList.SelectedValue;

        return myList;
    }

    public ActionResult pickState(MyModel pData)
    {
        if (pData.StateList == null)
        {
            if (String.IsNullOrEmpty(pData.StatePick)) // state abbrev, value collected onchange
            {
                pData.StateList = getStateList();
            }
            else
            {
                pData.StateList = getStateList(pData.StatePick);
            }

            // assign values to state list items
            try
            {
                SelectListItem si = (SelectListItem)pData.StateList.SelectedValue;
                pData.state = si.Value;
                pData.StatePick = si.Value;
            }
            catch { }
        } 
    return View(pData);
    }
}

pickState.cshtml ...

@model MyProject.Models.MyModel

@{
ViewBag.Title = "United States of America";
Layout = "~/Views/Shared/_Layout.cshtml";
}
<h2>@ViewBag.Title - Where are you...</h2>

@using (Html.BeginForm()) {
@Html.AntiForgeryToken()
@Html.ValidationSummary(true)

<fieldset>

    <div class="editor-label">
        @Html.DisplayNameFor(model => model.state)
    </div>
    <div class="display-field">            
        @Html.DropDownListFor(m => m.StatePick, Model.StateList, new { OnChange = "state.value = this.value;" })
        @Html.EditorFor(model => model.state)
        @Html.ValidationMessageFor(model => model.StateList)
    </div>         
</fieldset>
}

<div>
@Html.ActionLink("Back to List", "Index")
</div>
2
Joseph Poirier

私もジョーダンの答えが好きで、自分で実装しました。他の誰かが同じことを必要とする場合に備えて、私は略語だけが必要でした：

    public static IEnumerable<SelectListItem> GetStatesList()
    {
        IList<SelectListItem> states = new List<SelectListItem>
        {
            new SelectListItem() {Text="AL", Value="AL"},
            new SelectListItem() { Text="AK", Value="AK"},
            new SelectListItem() { Text="AZ", Value="AZ"},
            new SelectListItem() { Text="AR", Value="AR"},
            new SelectListItem() { Text="CA", Value="CA"},
            new SelectListItem() { Text="CO", Value="CO"},
            new SelectListItem() { Text="CT", Value="CT"},
            new SelectListItem() { Text="DC", Value="DC"},
            new SelectListItem() { Text="DE", Value="DE"},
            new SelectListItem() { Text="FL", Value="FL"},
            new SelectListItem() { Text="GA", Value="GA"},
            new SelectListItem() { Text="HI", Value="HI"},
            new SelectListItem() { Text="ID", Value="ID"},
            new SelectListItem() { Text="IL", Value="IL"},
            new SelectListItem() { Text="IN", Value="IN"},
            new SelectListItem() { Text="IA", Value="IA"},
            new SelectListItem() { Text="KS", Value="KS"},
            new SelectListItem() { Text="KY", Value="KY"},
            new SelectListItem() { Text="LA", Value="LA"},
            new SelectListItem() { Text="ME", Value="ME"},
            new SelectListItem() { Text="MD", Value="MD"},
            new SelectListItem() { Text="MA", Value="MA"},
            new SelectListItem() { Text="MI", Value="MI"},
            new SelectListItem() { Text="MN", Value="MN"},
            new SelectListItem() { Text="MS", Value="MS"},
            new SelectListItem() { Text="MO", Value="MO"},
            new SelectListItem() { Text="MT", Value="MT"},
            new SelectListItem() { Text="NE", Value="NE"},
            new SelectListItem() { Text="NV", Value="NV"},
            new SelectListItem() { Text="NH", Value="NH"},
            new SelectListItem() { Text="NJ", Value="NJ"},
            new SelectListItem() { Text="NM", Value="NM"},
            new SelectListItem() { Text="NY", Value="NY"},
            new SelectListItem() { Text="NC", Value="NC"},
            new SelectListItem() { Text="ND", Value="ND"},
            new SelectListItem() { Text="OH", Value="OH"},
            new SelectListItem() { Text="OK", Value="OK"},
            new SelectListItem() { Text="OR", Value="OR"},
            new SelectListItem() { Text="PA", Value="PA"},
            new SelectListItem() { Text="PR", Value="PR"},
            new SelectListItem() { Text="RI", Value="RI"},
            new SelectListItem() { Text="SC", Value="SC"},
            new SelectListItem() { Text="SD", Value="SD"},
            new SelectListItem() { Text="TN", Value="TN"},
            new SelectListItem() { Text="TX", Value="TX"},
            new SelectListItem() { Text="UT", Value="UT"},
            new SelectListItem() { Text="VT", Value="VT"},
            new SelectListItem() { Text="VA", Value="VA"},
            new SelectListItem() { Text="WA", Value="WA"},
            new SelectListItem() { Text="WV", Value="WV"},
            new SelectListItem() { Text="WI", Value="WI"},
            new SelectListItem() { Text="WY", Value="WY"}
        };
        return states;
    }
1
StuartD