MVC - Pass value to controller via JS

Question

I have a drop down

 <%=Html.DropDownList("genre", Model.genres, "", new { @onchange = ChangeMovie()" })%>

The JavaScript looks like (incomplete)

function ChangeMovie() {
    var genreSelection = container.find( '#genre' ).val();

    $.ajax({  
        "url" : "/Movies/GetGenre" ,
        "type" : "get" ,
        "dataType" : "json" ,
        "data" : { "selectedValue" : $( "#genre").val() },
        "success" : function (data) {}
    });
};

Conrtroller code

public ActionResult GetGenre(string genreName)
{
   //Need to get the `genreName` from the JavaScript function above.. which is
   // in turn coming from the selected value of the drop down in the beginning.

}

I want to pass the selected value of the drop down to the action result in the controller code via the js function. I need help manipulating the JavaScript code and the AJAX call code so the correct value is passed onto the controller.

CD Smith · Accepted Answer · 2012-05-21 15:34:48Z

3

You have a lot of unnecessary quotes as well not returning JSON in your action

$.ajax({
    url: "/Movies/GetGenre/",
    dataType: "json",
    cache: false,
    type: 'GET',
    data: {genreName: $("#genre").val() },             
    success: function (result) {
        if(result.Success) {
            alert(result.Genre);
        }
    }
});

Plus your controller isn't returning Json, modify your action to this

public JsonResult GetGenre(string genreName) {
    // do what you need to with genreName here 
    return Json(new { Success = true, Genre = genreName }, JsonRequestBehavior.AllowGet);
}

edited May 21, 2012 at 15:34

answered May 21, 2012 at 15:06

CD Smith

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3 Comments

ZVenue Over a year ago

I just need to pass genre.. not the city. I edited the OP. Thank you

CD Smith Over a year ago

It's a dynamically created property, JSON lets you create properties on the fly. By adding Success = true, I just created a boolean property and set it to true on the fly. If you had an error you could set it to false and include a Message = whatever your error was. By adding Genre = genreName I'm just creating a property on the fly and giving back the value that was sent in. You can change it to whatever you want

CD Smith Over a year ago

No problem, glad that got it going for you!

archil · Accepted Answer · 2012-05-21 15:00:02Z

3

For model binding to function correctly, field names of passed json object should match parameter names of your controller action. So, this should work

"data" : { "genreName" : $( "#genre").val() },

answered May 21, 2012 at 15:00

archil

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Comments

Tr1stan · Accepted Answer · 2012-05-21 16:02:10Z

3

The parameter name of the value you're posting in the Ajax request does not match the Action parameter name. selectedValue should be genreName.

Change this:

"data" : { "selectedValue" : $( "#genre").val() },

to this:

data : { genreName : $("#genre").val() },

edited May 21, 2012 at 16:02

answered May 21, 2012 at 14:59

Tr1stan

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