Question

我目前有一个下拉列表，用于从SQL Server表中提取值。我希望用户能够拉出值和/或能够添加或编辑他们选择的值。我希望有一个可编辑的下拉列表，因为我认为这是最好的选择。我创建了一个dropdownlist控件，但当前它与我的常规dropdownlist相同。我一直在网上搜索，但没有找到沙发人。我在想也许是Razor HTML Helper控件？每个人觉得这样做最好的是什么？（作为最后的选择，我可以使用Ajax），但是如果我能使用它，我真的希望有一个可编辑的下拉菜单。

// HERE IS MY CURRENT DDL
@Html.DropDownListFor(x => x.Description, (IEnumerable<SelectListItem>) ViewBag.DescriptionDDL,"", new { @class = "form-control" })
@Html.ValidationMessageFor(x => x.Description, "",new { @class = "text-danger" })

// Here is my dropdown control I built that is just a normal dropdown so far /* Custom Editable DropDownList Control */
        public static MvcHtmlString CustomDropDown<TModel, TValue>(this HtmlHelper<TModel> html, Expression<Func<TModel, TValue>> expression, 
            List<string> names, object htmlAttributes)
        {
            var fieldName = ExpressionHelper.GetExpressionText(expression);
            var fullbindingName = html.ViewContext.ViewData.TemplateInfo.GetFullHtmlFieldName(fieldName);
            var fieldId = TagBuilder.CreateSanitizedId(fullbindingName);
            var metaData = ModelMetadata.FromLambdaExpression(expression, html.ViewData);
            var value = metaData.Model;

            TagBuilder tagBuilder = new TagBuilder("select");
            tagBuilder.Attributes.Add("name", fullbindingName);
            tagBuilder.Attributes.Add("id", fieldId);

            StringBuilder options = new StringBuilder();
            options.AppendLine("<option value='0' > Select </option>");
            for(int i=0; i<names.Count; i++)
            {
                string singleOption = "<option value = '" + names[i].ToString() + "'>" + names[i].ToString() + "</options>";
                options.AppendLine(singleOption);
            }
            tagBuilder.InnerHtml = options.ToString();

            foreach(PropertyDescriptor prop in TypeDescriptor.GetProperties(htmlAttributes))
            {
                tagBuilder.MergeAttribute(prop.Name.Replace('_', '-'), prop.GetValue(htmlAttributes).ToString(), true);
            }
            return new MvcHtmlString(tagBuilder.ToString());
        }

MVC5可编辑DropdownList控件

0 个答案: