How to detect AJAX request in a filter

[spiau]

Hello,

I've setting up, before including RichFaces components in our webapp, a system to avoid multiple submission of a form. This system adds a requestId as hidden field in the form. A filter checks if the requestId has already been treated. If so, the request is waiting for the previous submission response.

With some ajax components in the form, requests are submitting when an event occurs. Then the multiple submission filter declare that a submission have already be done for the requestId : The page goes blank!

My question is the following : How to detect in a filter an ajax request in order to bypass the multiple submission checking.

Hope my explanation is understandable...

Regards,

Sebastien

[ilya_shaikovsky]

hm.. why just not use ajax queue?

[spiau]

Hello Ilya,

If i've all well understood, ajax queue are used with <a4j:commandlink>, but the form is submitted with <h:commandLink>.

I've noticed some differences in using <a4j:commandlink> instead. For example, the mouse cursor is not changed to 'wait'. And my page doesn't use navigation-case (the page is reloaded by returning "null" and some messages are displayed), using <h:commandLink> doesn't reload the page. I don't want to make deep modifications in the existing jsf page and faces configuration in order to use that.

Is it possible to use a queue via h:commandLink, if not is there a way to detect ajax request?

I'm still aware for any other way to achieve this task.

Sebastien

[spiau]

Ilya,

Moreover, I'm using RF 3.1.6... queue doesn't exist in this release.
It's an enough good reason not to use it!

Sebastien

[ahoehma]

Each ajax-request will contain a parameter "AJAXREQUEST".

You find such a method in

org.ajax4jsf.webapp.BaseXMLFilter#isAjaxRequest(ServletRequest request)

The method is not public so you have to copy&paste the code :-(

[nbelaevski]

3.1.6 includes queuing features for AJAX components - you can use them.

[spiau]

Thanks a lot everybody,

Detecting ajax request thru org.ajax4jsf.webapp.BaseXMLFilter#isAjaxRequest(ServletRequest request) works fine for me!

See you,

Sebastien