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POPassing nested arrays to asp.net mvc using jQuery's $.ajax
 

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    <p>I am trying to pass a nested array to an asp.net mvc controller like this:</p> <pre><code>var subgroups = []; subgroups [0] = [["A", "Y"], ["B", "Y"], ["C", "Y"]]; subgroups [1] = [["D", "Z"], ["E", "Z"], ["F", "Z"]]; $.ajax({ url: "&lt;%= Url.Content("~/Controller/Action") %&gt;", data: { subgroups: subgroups }, dataType: "json", context: document.body, success: function(data) { ... } ); </code></pre> <p>The resulting controller:</p> <pre><code>public ContentResult Action(List&lt;string[][]&gt; subgroups) { ... } </code></pre> <p>The problem is the resulting subgroups variable in the controller looks like this:</p> <pre><code>subgroups[0][0] == null; subgroups[0][1] == null; subgroups[0][2] == null; subgroups[1][0] == null; subgroups[1][1] == null; subgroups[1][2] == null; </code></pre> <p>The values from the deeply nested array don't get passed. Firebug reports the parameters of my ajax request are:</p> <pre><code>subgroups[0][0][] A subgroups[0][0][] Y subgroups[0][1][] B subgroups[0][1][] Y subgroups[0][2][] C subgroups[0][2][] Y subgroups[1][0][] D subgroups[1][0][] Z subgroups[1][1][] E subgroups[1][1][] Z subgroups[1][2][] F subgroups[1][2][] Z </code></pre> <p>It looks like the cause is that jQuery isn't filling in these array indexes because I can fix the problem is I format the data as:</p> <pre><code>subgroups [0] = [{ 0: "A", 1: "Y"}, ...]; </code></pre> <p>Why does jQuery put the indexes for the outer array, but not the inner one? Please tell me there is a better workaround for this than to manually specify numeric keys?</p>
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