更改@ html.DropDownList值时显示警报框

Question

  @Html.DropDownListFor(model => model.Status, new List<SelectListItem> 
       { new SelectListItem{Text="Active", Value="1",Selected =true},
         new SelectListItem{Text="Deactive", Value="0"}})

If i change the value Active to De active display the one alert box. How to display the alert box.

Answer 1

You could use the change() handler in Jquery to listen for the event.

$( "#targetId").change(function() {
     alert( "Something changed handle it here" );
});

http://api.jquery.com/change/

Answer 2

  Razor:-


 @Html.DropDownListFor(model => model.Status, new List<SelectListItem> 
               { new SelectListItem{Text="Active", Value="1",Selected =true},
                 new SelectListItem{Text="Deactive", Value="0"}})

Jquery(Change event is called when you change the dropdownlist value whose id is attached in below query) :-

 <script>

    $(document).ready(function(){
        $('select#status').change(function() {
            alert("value changed. New value is " + $(this).val());
    });
    });
});

</script>

Answer 3

Add this code in your master layout or in view in which Dropdown is:

First Way:

Jquery CODE:

<script>

    $(document).ready(function(){

     $('select#status').change(function() {
            alert($(this).val());
    });
});

</script>

Second Way:

Or you can add your own id like this:

 @Html.DropDownListFor(model => model.Status, new List<SelectListItem> 
               { new SelectListItem{Text="Active", Value="1",Selected =true},
                 new SelectListItem{Text="Deactive", Value="0"}
               },
                 null,
                 new {@id="DDLStatus"})

and script:

  <script>

        $(document).ready(function(){

         $('select#DDLStatus').change(function() {
                alert($(this).val());
        });
    });

    </script>

Note: make sure that jquery script file is included in your master layout mostly it is in View --> Shared --> _Layout.cshtml