我们如何在MVC中绑定groupwise下拉列表 [英] How we bind groupwise dropdownlist in MVC

问题描述

我想在MVC中组合动态下拉列表项。我的下拉列表只是绑定所有列表项，但我想实现类似optgrouphtml选择选项的下拉列表。任何人都可以帮助我



我尝试过：

这是我的html页面：
< pre> @ Html.DropDownList（cProductionLines，ViewBag.cProductionLines as SelectList，@ Resources.TitleResource.ProductionLines，new {@class =form-control ，@ id =cProductionLines}）

这是我的控制器代码：

 private void bindRequestProductionLines（）
 {
 List< COP_ProductList> ProductList = OUnitOfWork.ProductListRepositories.FindBy（x => x.IsActive == true）。ToList（）; 
 var ProductionLinesList = ProductList.Select（x => new 
 
 {
 Id = x.Id，
 Type =！CorporateSite.Helpers.CultureHelper.IsLanguageArabic？ x.Title_En：x.Title_Ar，
 Category =！CorporateSite.Helpers.CultureHelper.IsLanguageArabic？x.COP_ProductionLines.Name_EN：x.COP_ProductionLines.Name_AR，
 CategoryId = x.COP_ProductionLines_Id 
}） .ToList（）; 
 
 ViewBag.cProductionLines = new SelectList（ProductionLinesList，Id，Type，Category）; 
 
} 

解决方案

本文应该有所帮助： DropDownList支持HTMLoptgroup - ASP.NET MVC 5.2 | .NET Rumbles [ ^ ]



TL; DR ...从基础开始：

 @ Html.DropDownList（cProductionLines）

现在，如果工作正常，可以添加属性：

 @ Html.DropDownList（cProductionLines，null，new {@class =form-control，@ id =cProductionLines}）

I want to bind dynamic dropdownlist items group wise in MVC. My dropdown is simply bind with all list item but I want to achieve dropdownlist similar as "optgroup" html select option. Any one can help me

What I have tried:

This is my html page :
<pre>@Html.DropDownList("cProductionLines", ViewBag.cProductionLines as SelectList,  @Resources.TitleResource.ProductionLines, new { @class = "form-control", @id = "cProductionLines" })

and this is my controller code:

private void bindRequestProductionLines()
        {
            List<COP_ProductList> ProductList = OUnitOfWork.ProductListRepositories.FindBy(x => x.IsActive == true).ToList();
            var ProductionLinesList = ProductList.Select(x => new

            {
                Id = x.Id,
                Type = !CorporateSite.Helpers.CultureHelper.IsLanguageArabic ? x.Title_En : x.Title_Ar,
                Category = !CorporateSite.Helpers.CultureHelper.IsLanguageArabic ? x.COP_ProductionLines.Name_EN : x.COP_ProductionLines.Name_AR,
                CategoryId = x.COP_ProductionLines_Id
            }).ToList();

            ViewBag.cProductionLines = new SelectList(ProductionLinesList, "Id", "Type", "Category");
            
        }

解决方案

This article should help: HTML "optgroup" support in DropDownList – ASP.NET MVC 5.2 | .NET Rumbles[^]

TL;DR ... start with the basics:

@Html.DropDownList("cProductionLines")

Now, if that is working fine, you can add your attributes:

@Html.DropDownList("cProductionLines", null, new { @class = "form-control", @id = "cProductionLines" })

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