Re: Ajax request, ERXRedirect and ERXThreadStorage

Thu, 14 Jul 2016 22:18:28 -0700


On Jul 12, 2016, at 8:52 AM, Paul Hoadley <[email protected]> wrote:

Hello,

I’m working on an app where some page-level informational messages (such as validation problems) are stored in ERXThreadStorage, and displayed by the page wrapper. This works great for full page loads.

In a few places, I’m doing some Ajax submissions with AjaxSubmitButton. In the usual case, nothing goes wrong and an AjaxUpdateContainer displays some new information. I figured that a reasonable way to display validation errors from these Ajax submissions would be to stash the messages in ERXThreadStorage in the usual way, and then use ERXRedirect and its setComponentToPage() to just force a full page reload. This all works except (critically) the _retrieval_ of the messages from ERXThreadStorage—there’s nothing there. Is this expected?

It is expected.  The redirect is in fact a new request sent from the browser, it gets queued and processes by a different thread.  Even if you are lucky and get the same thread, the thread storage dictionary info will be fresh and empty (as for any new request).

Is the invocation of the action method by the Ajax submission on a different thread?

Yes, and with that pattern, the validation information is no longer thread bound but is now multi-request (imagine .css, .js or .jpg requests) bound … or simply session bound.
Maybe you can keep it in a « session’s last request validation info object » and clear it at the start of a full-page request.

jfv

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