Question

我正在尝试为dropdownlist触发onchange事件的操作方法，如何在不使用jquery onchange的情况下执行此操作。

@Html.DropDownList("Sortby", 
                   new SelectListItem[] 
                   { 
                       new SelectListItem() { Text = "Newest to Oldest", Value = "0" }, 
                       new SelectListItem() { Text = "Oldest to Newest", Value = "1" }})

由于

Answer 1

如果您不想要jquery，那么您可以使用javascript：

@Html.DropDownList("Sortby", new SelectListItem[] 
{ 
     new SelectListItem() { Text = "Newest to Oldest", Value = "0" }, 
     new SelectListItem() { Text = "Oldest to Newest", Value = "1" }},
     new { @onchange="CallChangefunc(this.value)" 
});

<script>
    function CallChangefunc(val){
        window.location.href = "/Controller/Actionmethod?value=" + val;
    }
</script>

Answer 2

你可以这样做

@Html.DropDownList("Sortby", new SelectListItem[] { new SelectListItem() 
  { 

       Text = "Newest to Oldest", Value = "0" }, new SelectListItem() { Text = "Oldest to Newest", Value = "1" } , new
       {
           onchange = @"form.submit();"
       }
})

Answer 3

如果要将值传递给action方法，可以尝试此操作。

@Html.DropDownList("Sortby", new SelectListItem[] { new SelectListItem() { Text = "Newest to Oldest", Value = "0" }, new SelectListItem() { Text = "Oldest to Newest", Value = "1" }},new { onchange = "document.location.href = '/ControllerName/ActionName?id=' + this.options[this.selectedIndex].value;" })

在没有参数传递的情况下删除查询字符串。

Answer 4

尝试：

@Html.DropDownList("Sortby", new SelectListItem[] { new SelectListItem() 
{ Text = "Newest to Oldest", Value = "0" }, new SelectListItem() 
{ Text = "Oldest to Newest", Value = "1" }},
new { onchange = "document.location.href = '/ControllerName/ActionName?id=' + this.options[this.selectedIndex].value;" })

Answer 5

如果您有列表视图，则可以执行此操作：

定义选择列表：

@{
   var Acciones = new SelectList(new[]
   {
  new SelectListItem { Text = "Modificar", Value = 
   Url.Action("Edit", "Countries")},
  new SelectListItem { Text = "Detallar", Value = 
  Url.Action("Details", "Countries") },
  new SelectListItem { Text = "Eliminar", Value = 
  Url.Action("Delete", "Countries") },
 }, "Value", "Text");
}

使用定义的SelectList，为每条记录创建不同的id（记住每个元素的id在视图中必须是唯一的），最后为onchange事件调用javascript函数（包括示例url中的参数和记录键）：
```
@Html.DropDownList("ddAcciones", Acciones, "Acciones", new { id = 
item.CountryID, @onchange = "RealizarAccion(this.value ,id)" })
```

onchange函数可以是：

@section Scripts {
<script src="~/Scripts/jquery-1.10.2.min.js"></script>
<script src="~/Scripts/jquery.unobtrusive-ajax.js"></script>

<script type="text/javascript">

function RealizarAccion(accion, country)
{

    var url = accion + '/' + country;
    if (url != null && url != '') {
        window.location.href = url ;
    }
}
</script>

@Scripts.Render("~/bundles/jqueryval")
}

Answer 6

首先，您需要提供下拉 onchange 事件；

@Html.DropDownList("ddl_reportId", new SelectList(ViewBag.ddl_reportName, "ddl_reportId", "ddl_reportName"), "Raporu seçin", new { @class = "form-control", @onchange = "getVal()" })

然后在脚本部分你必须像这样调用它。

function getVal() {
    var selectedVal = document.getElementById("ddl_reportId").value;
    console.log(selectedVal)};

html.dropdownlist的onchange事件

7 个答案: