PrimeFaces: conditional update on validation

Question

Is it possible to conditionally update JSF components only when validation succeeds?

I would like to be able to do something like

<p:commandLink process="@form" listener="#{foo}" 
  update="something somethingElse">

where "something" only gets updated if validation is successful.

Is there any way that can be done or is that just not supported in JSF?

I've been able to rig up kind of a hack with hidden commandLinks but not entirely satisfied:

<p:commandLink process="@form" listener="#{foo}" 
  update="somethingElse" oncomplete="if (!args.validationFailed) $("#link").click();">
<p:commandLink style="display:none" id="link"
  update="something">

I'm trying to do the opposite: update something only when validation is successful. — wrschneider, Mar 09 '12 at 20:52
oncomplete="if (!args.validationFailed) $("#link").click(); this code is not working for me... :( my conditional update is not working... — Dhruv, Jun 15 '12 at 11:02
And I am not able to get h:messages approach.. Kindly elaborate — Dhruv, Jun 15 '12 at 11:02

DaBlick · Answer 1 · 2015-07-21T20:33:59.353

3

I don't think the message suggestion necessarily answers the question asked. Suppose he wants to update something OTHER than a message?

I've not tried this myself, but another approach that might work is to use remotecommand.

<p:remoteCommand id='good' update='goodUpdates'/>  
<p:remoteCommand id='bad' update='badUpdate'/>  
<p:commandButton oncomplete='if (your-test) good() else bad()'/>

Note, this would necessitate another round-trip to the server and thus performance is a consideration.

edited Jul 21 '15 at 20:33

answered May 20 '15 at 13:06

DaBlick

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Correct. I have corrected the example ("oncomplete") – DaBlick Jul 21 '15 at 20:34
1

Thanks a lot :) but id not works for me, I added attribute name .... Now working fine... – Praveenkumar_V Feb 02 '17 at 07:58

score 2 · Accepted Answer · answered Mar 09 '12 at 17:48

2

The <h:message> (or PrimeFaces' counterpart <p:message>) is intented for this. Or, in your case maybe better, the <h:messages> (or <p:messages>).

public void submit() {
    // ...

    if (fail) {
        FacesContext.getCurrentInstance().addMessage(null, 
            new FacesMessage(FacesMessage.SEVERITY_ERROR, "Fail", null));
    }
}

with

<h:messages id="messages" />
<p:commandLink process="@form" action="#{bean.submit}" update="messages something" />

Note that you're as well supposed to use a normal Validator implementation to perform the validation. If it throws a ValidatorException, then the action won't be invoked anyway. Doing validation inside action method is a smell.

answered Mar 09 '12 at 17:48

BalusC

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I'm trying to do the opposite: update something only when validation is successful. – wrschneider Mar 09 '12 at 20:53
1

Do the same, but then use `SEVERITY_INFO` with a "Success" message instead. The action method won't be invoked anyway when the validation has failed. An alternative is to let the action method set some property and use `rendered="#{not empty bean.someProperty}"`. – BalusC Mar 10 '12 at 02:08
Another variation on @BalusC last suggestion: `FacesCopntext.getPartialViewContext().getRenderIds().add("updateComponentId")` in the action listener. Only executed if validation succeeds. – wrschneider Mar 28 '12 at 13:44
Can you please elaborate with the code.. I am not able to understand the how to update conditionally basically when validation fail I want to update 2 components but If validation got success I want to update 3 component... 2 previous and one extra.. Kindly help\ – Dhruv Jun 15 '12 at 11:08
I don't think the `message` suggestion necessarily answers the question asked. Suppose he wants to update something OTHER than a `message`? I've not tried this myself, but another approach that might work is to use `remotecommand`. – DaBlick May 20 '15 at 13:00

PrimeFaces: conditional update on validation

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