Passing variables with ajax request

[tomba]

Hi all,

I have an a4j:support on an onchange event for a combobox. All fine, that works as it should, except that I lose a parameter.

When my page is first loaded, I have a http GET parameter "consulting=1". At the time that I change the selected value of my combo box, a request is sent to the server with apparently just that value. Therefore, "consulting=1" is lost and I have false results.

Here's my code:

 <a4j:region renderRegionOnly="false">
 <h:form id="filter">
 <h:selectOneListbox onchange="submit()" id="cmbProduct" size="1" value="#{projectList.currentProduct}" style="width: 200px">
 <f:selectItems value="#{projectList.availableProducts}"/>
 <a4j:support onsubmit="Richfaces.showModalPanel('busy')" event="onchange" oncomplete="Richfaces.hideModalPanel('busy');sortables_init()" reRender="projectlist"/>
 </h:selectOneListbox>
 <h:inputHidden value="#{projectList.consulting}" />
 </h:form>
 </a4j:region>

Does anyone know how to maintain this variable across different requests? As you can see I tried with an inputHidden field but that doesn't get set ater my AJAX request.

Thank you

[sergeysmirnov]

It hard for me to understand how it might work fine if you have onchange="submit()" that means to perform a regular non-ajax request with full page reloading.

...or may be submit() means something also in your code?

[alexsmirnov]

You can add parameter to ajax request :

<a4j:support onsubmit="Richfaces.showModalPanel('busy')" event="onchange" oncomplete="Richfaces.hideModalPanel('busy');sortables_init()" reRender="projectlist">
 <f:param name="consulting" value="#{params.consulting}" />
</a4j:support>

[tomba]

Sorry for the submit() call, it was a leftover in my code and should not have been here.

Anyway, the a4j manual says the following:

In this example the request contains only the input component causes the request generation, not all the components contained on a form, because of "ajaxSingle=true" usage.

Since I have not set ajaxSingle, I would expect also hidden input fields to be sent on the ajax request.

As for the f:param, can you also explain where I have to handle that parameter? It doesn't help putting it in the value function of the to-be-rerendered component.

Thanks for the help

[tomba]

So I tried with an f:param and even an f:attribute and with adding an actionListener in the a4j tag. However, in neither case I get the actual value but always null :(

[ilya_shaikovsky]

Put please latest sources with f:param here. And describe the behaviour you expected for the code step by step please.

B.t.w. One more component to set some value to the backing bean directly, while sending an ajax request, is a4j:actionparam

[tomba]

Well I have solved the problem now. The problem to overcome was to still have the initial GET parameters available across different ajax requests.

Therefore, I made an init-param for my managed-bean and put a inputHidden field in the form.

Greetings,
Steven De Groote