jQuery Ajax POSTing array to ASP.NET MVC Controller

Question

I'm missing something here. I've got this jQuery JavaScript:

$.ajax({
    type: "POST",
    url: "/update-note-order",
    dataType: "json",
    data: {
        orderedIds: orderedIds,
        unixTimeMs: new Date().getTime()
    }
});

Where orderedIds is a JavaScript number array (e.g. var orderedIds = [1, 2]).

The handling Controller method is:

[HttpPost]
public void UpdateNoteOrder(long[] orderedIds, long unixTimeMs)
{
    ...
}

When I put a Debugger.Break() in UpdateNoteOrder(), orderedIds is null in the Watch window. (unixTimeMs, however, has a numeric value.)

How do I pass the number array through $.ajax() such that orderedIds is a long[] in my controller?

Darin Dimitrov · Accepted Answer · 2010-12-09 19:09:51Z

125

Just set the traditional parameter to true:

$.ajax({
    type: "POST",
    url: "/update-note-order",
    dataType: "json",
    traditional: true,
    data: {
        orderedIds: orderedIds,
        unixTimeMs: new Date().getTime()
    }
});

Since jquery 1.4 this parameter exists because the mechanism to serialize objects into query parameters has changed.

answered Dec 9, 2010 at 19:09

Darin Dimitrov

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3 Comments

Amit Patel Over a year ago

Unfortunately in my Rails application, I get only last element of the array. I verified that browser is sending array correctly. In above example, I replaced orderedIds: orderedIds with 'orderedIds[]': orderedIds to make it work for Rails.

Sakthivel Over a year ago

Great one. Instead of using Viewmodel for a simple string array, traditional true does it. upvoted !

Jeremy Over a year ago

I've spent an unbelievable amount of time trying to figure out this issue in my code and I stumbled across this gem. Thanks for your help.

Jeremy B. · Accepted Answer · 2010-12-09 19:08:08Z

0

you'll need to turn orderedId's into a param array, or the controller won't see it

$.param({ orderedIds: orderedIds });

in your code:

$.ajax({
    type: "POST",
    url: "/update-note-order",
    dataType: "json",
    data: {
        orderedIds: $.param({ orderedIds: orderedIds }),
        unixTimeMs: new Date().getTime()
    }
});

answered Dec 9, 2010 at 19:08

Jeremy B.

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6 Comments

AgileMeansDoAsLittleAsPossible Over a year ago

This does not work. In UpdateNoteOrder, orderedIds is still null.

Jeremy B. Over a year ago

if it doesn't work, check your code first, this is taken directly from the jquery documentation api.jquery.com/jQuery.param You may want to be sure you are correct before rejecting an answer

Darin Dimitrov Over a year ago

I can confirm also that this doesn't work (I wrote a sample application in order to test it).

Jeremy B. Over a year ago

I tested with 1.3.2, I see now the changes were in 1.4. I guess I didn't update jquery recently.

Darin Dimitrov Over a year ago

in jquery 1.3.2 you don't even need $.param, it will work out of the box. Unfortunately in jquery 1.4 this behavior has changed.

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