处理HTML.DropDownList Razor MVC中的onchange事件

Question

我onchange通过简单的HTML 处理具有选定值的事件,如下所示:

<select onchange="location = this.value;">
         <option value="/product/categoryByPage?PageSize=15" selected="selected">15</option>
         <option value="/product/categoryByPage?PageSize=30" selected="selected">30</option>
         <option value="/product/categoryByPage?PageSize=50" selected="selected">50</option>
</select>

这样做:

List<SelectListItem> items = new List<SelectListItem>();
string[] itemArray = {"15","30","50"};

for (int i = 0; i < itemArray.Count(); i++)
{
    items.Add(new SelectListItem 
    { 
        Text = itemArray[i], 
        Value = "/product/categoryByPage?pageSize=" + itemArray[i]
    });
}

ViewBag.CategoryID = items;
@Html.DropDownList("CategoryID")

我该如何处理onchange与@Html.DropDownList()

Answer 1

描述

您可以使用该DropDownList方法的另一个重载.选择您需要的那个并使用您的html属性传入一个对象.

样品

@Html.DropDownList("CategoryID", null, new { @onchange="location = this.value;" })

更多信息

• MSDN - SelectExtensions.DropDownList方法

Answer 2

dknaack的方式对我不起作用,我也找到了这个解决方案:

@Html.DropDownList("Chapters", ViewBag.Chapters as SelectList, 
                    "Select chapter", new { @onchange = "location = this.value;" })

哪里

@Html.DropDownList(controlName, ViewBag.property + cast, "Default value", @onchange event)

在控制器中,您可以添加:

DbModel db = new DbModel();    //entity model of Entity Framework

ViewBag.Chapters = new SelectList(db.T_Chapter, "Id", "Name");