Keep p:dialog open when a validation error occurs after submit

Minimal example dialog:

<p:dialog header="Test Dialog"  
          widgetVar="testDialog"> 
  <h:form> 
    <p:inputText value="#{mbean.someValue}"/> 

    <p:commandButton value="Save" 
                     onsuccess="testDialog.hide()" 
                     actionListener="#{mbean.saveMethod}"/> 
  </h:form>       
</p:dialog> 

What I want to be able to do is have the mbean.saveMethod somehow prevent the dialog from closing if there was some problem and only output a message through growl. This is a case where a validator won't help because there's no way to tell if someValue is valid until a save is submitted to a back end server. Currently I do this using the visible attribute and point it to a boolean field in mbean. That works but it makes the user interface slower because popping up or down the dialog requires hitting the server.

The onsuccess runs if ajax request itself was successful (i.e. there's no network error, uncaught exception, etc), not if action method was successfully invoked.

Given a <p:dialog widgetVar="yourWidgetVarName">, you could remove the onsuccess and replace it by PrimeFaces RequestContext#execute() inside saveMethod():

if (success) {
    RequestContext.getCurrentInstance().execute("PF('yourWidgetVarName').hide()");
}

Note: PF() was introduced in PrimeFaces 4.0. In older PrimeFaces versions, you need yourWidgetVarName.hide() instead.

If you prefer to not clutter the controller with view-specific scripts, you could use oncomplete instead which offers an args object which has a boolean validationFailed property:

<p:commandButton ...
    oncomplete="if (args &amp;&amp; !args.validationFailed) PF('yourWidgetVarName').hide()" />

The if (args) check is necessary because it may be absent when an ajax error has occurred and thus cause a new JS error when you try to get validationFailed from it; the & instead of & is mandatory for the reason explained in this answer, refactor if necessary to a JS function which you invoke like oncomplete="hideDialogOnSuccess(args, 'yourWidgetVarName')" as shown in Keep <p:dialog> open when validation has failed.

If there is however no validation error and the action method is successfully triggered, and you would still like to keep the dialog open because of e.g. an exception in the service method call, then you can manually trigger validationFailed to true from inside backing bean action method by explicitly invoking FacesContext#validationFailed(). E.g.

FacesContext.getCurrentInstance().validationFailed();

I've just googled up this solution. Basically the idea is to use actionListener instead of button's action, and in backing bean you add callback parameter which will be then check in button's oncomplete method. Sample partial code:

JSF first:

<p:commandButton actionListener="#{myBean.doAction}"
   oncomplete="if (!args.validationFailed &amp;&amp; args.saved) schedulesDialog.hide();" />

Backing bean:

public void doAction(ActionEvent actionEvent) {
    // do your stuff here...
    if (ok) {
        RequestContext.getCurrentInstance().addCallbackParam("saved", true);
    } else {
        RequestContext.getCurrentInstance().addCallbackParam("saved", false);
    }
}

Hope this helps someone :)

Using the oncomplete attribute from your command button and really simple script will help you a lot.

Your dialog and command button would be something similar to this:

<p:dialog widgetVar="dialog">
   <h:form id="dialogView">
       <p:commandButton id="saveButton" icon="ui-icon-disk"
           value="#{ui['action.save']}"
           update=":dataList :dialogView"
           actionListener="#{mbean.save()}"
           oncomplete="handleDialogSubmit(xhr, status, args)" />
   </h:form>
 </p:dialog>

An the script would be something like this:

<script type="text/javascript">
    function handleDialogSubmit(xhr, status, args) {
        if (args.validationFailed) {
            dialog.show();
        } else {
            dialog.hide();
        }
    }
</script>

I use this solution:

JSF code:

<p:dialog ... widgetVar="dlgModify" ... >
...
<p:commandButton value="Save" update="@form" actionListener="#{AdminMB.saveTable}" />
<p:commandButton value="Cancel" oncomplete="PF('dlgModify').hide();"/>

Backing bean code:

public void saveTable() {
    RequestContext rc = RequestContext.getCurrentInstance();
    rc.execute("PF('dlgModify').hide()");
}