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Editorial Team
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Asked: 2026-05-14T07:29:47+00:00

Does the jQuery $.ajaxSetup method not respect the data field in the options hash

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Does the jQuery $.ajaxSetup method not respect the data field in the options hash when $.post or $.get is called?

For example, I might have this code:

$.ajaxSetup({ data: { persist: true } });

Then, to send a POST request, I would call this:

$.post("/create/something", { name: "foo" });

I was expecting the actual POST data to look like this:

{
  persist: true,
  name: "foo"
}

but the only data sent by $.post is { name: "foo" }. Is there any way to get the expected behavior? I’m using jQuery 1.4.1.

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1 Answer

  1. Editorial Team

    $.ajaxSetup() sets defaults for your ajax requests. Any options you set in the request method will override these defaults, not merge them. You’re actually overriding

    { persist: true }

    with

    { name: "foo" }

    This no longer appears to be the case — a ticket on the jQuery tracker suggests that this was added in a version update and jQuery now merges the objects instead of replacing the default (thanks @Quincy).

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