fire clicking on a4j:commandbutton

[ajanz]

i got a page with a4j:commandbuttons.

i want to avoid, if a user clicks a button multiple times, the server function is executed more than once.

i thought a4j:queue will do that for me with ignoreDupResponses=false

but the server function is executed minimum twice.

where is my mistake?

[nbelaevski]

Hi Sascha,

ignoreDupResponses is a client-side optimization feature, it cannot prevent calling server methods. You can disable a4j:commandButton on click and make it enabled in oncomplete.

[harut]

Hi,

     You can show some "loading" message when the button clicked till it's action will complete.

E.g.

<a4j:commandButton id="cleanButton"
                  value="#{bundle['mytask.search.clean']}" 
                  actionListener="#{searchTaskController.onCleanSearchRequested}"
                  reRender="searchPart"                 
                  onclick="Richfaces.showModalPanel('ajaxLoadingBarId')"
                  oncomplete="Richfaces.hideModalPanel('ajaxLoadingBarId')"/>

Where modalPanel is:

<rich:modalPanel id="ajaxLoadingBarId"
                                 autosized="false"
                                 resizeable="false"
                                 width="200"
                                 height="50"
                                 style="border:#000000; border-width:0px; border-style:hidden; background:transparent;"
                                 shadowDepth="-500000"
                                 showWhenRendered="false">
                  
                        <h:graphicImage value="/loading.gif" alt="loading"/>                  
</rich:modalPanel>

Use any "Loading image" in the above modalPanel.

You can add mentioned 2 javascript rows in any rich/a4j component which sends ajax request.

onclick="Richfaces.showModalPanel('ajaxLoadingBarId')"
oncomplete="Richfaces.hideModalPanel('ajaxLoadingBarId')"

In case of <a4j:support/> use onsubmit insteadof onclick...

Regards, Harut.

[ilya_shaikovsky]

or just disable the button on onclick and enable on oncomplete.