我正在一个页面上,用户需要填写一些信息,最后选择一个或多个带有复选框的客户.
客户列表是IEnumerable< Customer>我传入我的模型.我如何使用.CheckBoxFor()创建复选框列表?
最后,我希望能够验证是否已选择至少1个复选框.
请求是保存用户输入的信息的对象.
<% foreach (var customer in Model.Request.Customers) { %> <%= Html.CheckBoxFor(/* customer */) %> <% } %>
谁能指出我正确的方向?或者我这样做是错的?
解决方法
您可以创建一个自定义html扩展类并重载CheckBoxFor方法,如下所示.该方法将metadata.Model计算为传递给它的值(如美国州).您可以从ControllerAction中的FormCollection获取复选框值:
public ActionResult Edit(FormCollection formCollection) { // Get the value(s) string checkBox = formCollection["State"]; // perform validation .... }
示例假定keyvaluepair通用列表
<% foreach (var element in UnitedStatesDictionary()) { %> <%= Html.CheckBoxFor(model => model.State,null,element.Key) %><%= element.Value %><br /> <% } %>
HtmlExtensions.cs
using System; using System.Linq; using System.Linq.Expressions; using System.Web.Mvc; using System.Web.Routing; public static class HtmlExtensions { /// <summary> /// Checks the box for. /// </summary> /// <typeparam name="TModel">The type of the model.</typeparam> /// <typeparam name="TValue">The type of the value.</typeparam> /// <param name="html">The HTML.</param> /// <param name="expression">The expression.</param> /// <returns>Checkbox</returns> public static MvcHtmlString CheckBoxFor<TModel,TValue>(this HtmlHelper<TModel> html,Expression<Func<TModel,TValue>> expression) { return CheckBoxFor(html,expression,new RouteDirection()); } /// <summary> /// Checks the box for. /// </summary> /// <typeparam name="TModel">The type of the model.</typeparam> /// <typeparam name="TValue">The type of the value.</typeparam> /// <param name="html">The HTML.</param> /// <param name="expression">The expression.</param> /// <param name="htmlAttributes">The HTML attributes.</param> /// <returns>Checkbox</returns> public static MvcHtmlString CheckBoxFor<TModel,TValue>> expression,object htmlAttributes) { return CheckBoxFor(html,htmlAttributes,""); } /// <summary> /// Checks the box for. /// </summary> /// <typeparam name="TModel">The type of the model.</typeparam> /// <typeparam name="TValue">The type of the value.</typeparam> /// <param name="html">The HTML.</param> /// <param name="expression">The expression.</param> /// <param name="htmlAttributes">The HTML attributes.</param> /// <param name="checkedValue">The checked value.</param> /// <returns>Checkbox</returns> public static MvcHtmlString CheckBoxFor<TModel,object htmlAttributes,string checkedValue) { ModelMetadata metadata = ModelMetadata.FromLambdaExpression(expression,html.ViewData); string htmlFieldName = ExpressionHelper.GetExpressionText(expression); TagBuilder tag = new TagBuilder("input"); tag.Attributes.Add("type","checkbox"); tag.Attributes.Add("name",metadata.PropertyName); if (!string.IsNullOrEmpty(checkedValue)) { tag.Attributes.Add("value",checkedValue); } else { tag.Attributes.Add("value",metadata.Model.ToString()); } if (htmlAttributes != null) { tag.MergeAttributes(new RouteValueDictionary(htmlAttributes)); } if (metadata.Model.ToString() == checkedValue) { tag.Attributes.Add("checked","checked"); } return MvcHtmlString.Create(tag.ToString(TagRenderMode.SelfClosing)); } }
我在这里,这是我的美国名单,以完成代码:
/// <summary> /// United States dictionary. /// </summary> /// <returns>List of United States</returns> public static List<KeyValuePair<string,string>> UnitedStatesDictionary() { var arrList = new List<KeyValuePair<string,string>>(); arrList.Add(new KeyValuePair<string,string>("AL","Alabama")); arrList.Add(new KeyValuePair<string,string>("AK","Alaska")); arrList.Add(new KeyValuePair<string,string>("AZ","Arizona" )); arrList.Add(new KeyValuePair<string,string>("AR","Arkansas" )); arrList.Add(new KeyValuePair<string,string>("CA","California" )); arrList.Add(new KeyValuePair<string,string>("CO","Colorado" )); arrList.Add(new KeyValuePair<string,string>("CT","Connecticut" )); arrList.Add(new KeyValuePair<string,string>("DE","Delaware" )); arrList.Add(new KeyValuePair<string,string>("DC","District Of Columbia" )); arrList.Add(new KeyValuePair<string,string>("FL","Florida" )); arrList.Add(new KeyValuePair<string,string>("GA","Georgia" )); arrList.Add(new KeyValuePair<string,string>("HI","Hawaii" )); arrList.Add(new KeyValuePair<string,string>("ID","Idaho" )); arrList.Add(new KeyValuePair<string,string>("IL","Illinois" )); arrList.Add(new KeyValuePair<string,string>("IN","Indiana" )); arrList.Add(new KeyValuePair<string,string>("IA","Iowa" )); arrList.Add(new KeyValuePair<string,string>("KS","Kansas" )); arrList.Add(new KeyValuePair<string,string>("KY","Kentucky" )); arrList.Add(new KeyValuePair<string,string>("LA","Louisiana" )); arrList.Add(new KeyValuePair<string,string>("ME","Maine" )); arrList.Add(new KeyValuePair<string,string>("MD","Maryland" )); arrList.Add(new KeyValuePair<string,string>("MA","Massachusetts" )); arrList.Add(new KeyValuePair<string,string>("MI","Michigan" )); arrList.Add(new KeyValuePair<string,string>("MN","Minnesota" )); arrList.Add(new KeyValuePair<string,string>("MS","Mississippi" )); arrList.Add(new KeyValuePair<string,string>("MO","Missouri" )); arrList.Add(new KeyValuePair<string,string>("MT","Montana" )); arrList.Add(new KeyValuePair<string,string>("NE","Nebraska" )); arrList.Add(new KeyValuePair<string,string>("NV","Nevada" )); arrList.Add(new KeyValuePair<string,string>("NH","New Hampshire" )); arrList.Add(new KeyValuePair<string,string>("NJ","New Jersey" )); arrList.Add(new KeyValuePair<string,string>("NM","New Mexico" )); arrList.Add(new KeyValuePair<string,string>("NY","New York" )); arrList.Add(new KeyValuePair<string,string>("NC","North Carolina" )); arrList.Add(new KeyValuePair<string,string>("ND","North Dakota" )); arrList.Add(new KeyValuePair<string,string>("OH","Ohio" )); arrList.Add(new KeyValuePair<string,string>("OK","Oklahoma" )); arrList.Add(new KeyValuePair<string,string>("OR","Oregon" )); arrList.Add(new KeyValuePair<string,string>("PA","Pennsylvania" )); arrList.Add(new KeyValuePair<string,string>("RI","Rhode Island" )); arrList.Add(new KeyValuePair<string,string>("SC","South Carolina" )); arrList.Add(new KeyValuePair<string,string>("SD","South Dakota" )); arrList.Add(new KeyValuePair<string,string>("TN","Tennessee" )); arrList.Add(new KeyValuePair<string,string>("TX","Texas" )); arrList.Add(new KeyValuePair<string,string>("UT","Utah" )); arrList.Add(new KeyValuePair<string,string>("VT","Vermont" )); arrList.Add(new KeyValuePair<string,string>("VA","Virginia" )); arrList.Add(new KeyValuePair<string,string>("WA","Washington" )); arrList.Add(new KeyValuePair<string,string>("WV","West Virginia" )); arrList.Add(new KeyValuePair<string,string>("WI","Wisconsin" )); arrList.Add(new KeyValuePair<string,string>("WY","Wyoming" )); return arrList; }