DropDown list onchange event and AJAX in MVC

I have a code block in my MVC view as follows:

<%using (Ajax.BeginForm("开发者_运维问答MyAction", new { action = "MyAction", controller = "Home", id = ViewData["selected"].ToString() }, new AjaxOptions { UpdateTargetId = "Div1" }))
     { %>
          <%=Html.DropDownList("ddl", ViewData["MyList"] as SelectList, new { onchange = "this.form.submit()" })%>
                 <%} %>

I want to set the value of ViewData["selected"] so that i can send it to the desired action. Can anyone please suggest how can i do this?

thanks!

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Instead of using a form, why not use a jQuery onChange event on your drop down?

$(document).ready(function() {
    $("#ddl").change(function() {
        var strSelected = "";
        $("#ddl option:selected").each(function() {
            strSelected += $(this)[0].value;
        });
        var url = "/Home/MyAction/" + strSelected;

        $.post(url, function(data) {
            // do something if necessary
        });
    });
});

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ViewData is not the place to pass data back to the server side. Values of html input controls within form tag are conveniently available in action method. You can get these values either from various types of action method arguments (model, formcollection etc).

Here is a link to free asp.net mvc ebook tutorial. Is a good resource for asp.net mvc.

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Found solution at this post it is just small chnge

Yes, that’s right – only change is replacing:

onchange = “this.form.submit();”

with:

onchange = “$(this.form).submit();”