Passing array parameters from jquery to ASP.NET MVC

Question

Does anyone have any insight on what's going on here? Here is my clientside jquery 1.4.1 code:

$.ajax({
    type: "POST",
    url: "PrintBOL/Print",
    data: [1, 2, 3],
    contentType: "application/json; charset=utf-8",
    dataType: "json",
    error: function(xmlHttpRequest, status, errorThrown) {
        console.debug(xmlHttpRequest)
    },
    success: function(serverReply) {
        console.debug("OK")
        console.debug(serverReply)
    }
})

Here is my server-side method signature:

public ActionResult Print(int[] ids)

The ids parameter always comes across as null.

Any ideas?

By the way I make sure I invoke this at the top of the page:

 jQuery.ajaxSettings.traditional = true

UPDATE: See comments in Steven's answer below for resolution.

Steven Pardo · Accepted Answer · 2010-02-08 16:50:36Z

4

try the following:

change:

data: [1, 2, 3],

to

data: {"ids": [1, 2, 3]},

answered Feb 8, 2010 at 16:50

Steven Pardo

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3 Comments

Steven Pardo Over a year ago

does the Print Action have the POST attribute [AcceptVerbs(HttpVerbs.Post)]?

Steven Pardo Over a year ago

remove contentType: "application/json; charset=utf-8" and dataType: "json". JSON is the default for jQuery. Also, root your url: url: "/PrintBOL/Print".

George Mauer Over a year ago

Removing contentType: "application/json; charset=utf-8", did it! WTF?

Craig Stuntz · Accepted Answer · 2010-02-08 16:48:42Z

2

You need to do:

data: { "ids[0]": 1, "ids[1]": 2, "ids[2]": 3},

answered Feb 8, 2010 at 16:48

Craig Stuntz

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8 Comments

George Mauer Over a year ago

hmm, does var ids = [1,2,3]; JSON.stringify(ids) work? How do I get that serialization automatically?

George Mauer Over a year ago

Odd I just tried this - data: {"ids[0]": 1, "ids[1]": 2}, and it still came accross as null

Craig Stuntz Over a year ago

Try changing the param to IEnumerable<int> ids -- that's how I do it.

George Mauer Over a year ago

still nothing! How do I even go about debugging whats going wrong here?

Craig Stuntz Over a year ago

Look at the data you're sending in Firebug's Net panel or Fiddler. If you still can't figure it out, add the form data to your question.

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