onchange event for html.dropdownlist

问题

I am trying to trigger an action method for onchange event for dropdownlist, how can I do this without using jquery onchange.

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

Thanks

回答1:

You can do this

@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();"
       }
})

回答2:

If you don't want jquery then you can do it with 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>

回答3:

@Html.DropDownListFor(m => m.State,
              new SelectList(ViewBag.StateList, "StateId", "StateName"),
              "Select state",
              new { @class = "form-control", @onchange="FillCity()" })



function FillCity() {
    var stateId = $('#State').val();
    $.ajax({
        url: '/Employees/FillCity',
        type: "GET",
        dataType: "JSON",
        data: { State: stateId},
        success: function (cities) {                    
            $("#City").html(""); // clear before appending new list 
            $.each(cities, function (i, city) {
                $("#City").append(
                    $('<option></option>').val(city.CityId).html(city.CityName));
            });
        }
    });
  }

回答4:

You can try this if you are passing a value to the action method.

@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;" })

Remove the query string in case of no parameter passing.

回答5:

try this :

@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;" })

回答6:

If you have a list view you can do this:

Define a select list:

@{
   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");
}

Use the defined SelectList, creating a diferent id for each record (remember that id of each element must be unique in a view), and finally call a javascript function for onchange event (include parameters in example url and record key):
```
@Html.DropDownList("ddAcciones", Acciones, "Acciones", new { id = 
item.CountryID, @onchange = "RealizarAccion(this.value ,id)" })
```

onchange function can be something as:

@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")
}

来源：https://stackoverflow.com/questions/25056508/onchange-event-for-html-dropdownlist

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html.dropdownlistfor