Show dialog when the input data is validated <p:confirmDialog> [duplicate] - jsf-2

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This question already has an answer here:
How to display dialog only on complete of a successful form submit
(1 answer)
Closed 6 years ago.
For my school project I have to realize a mini website where I use primefaces framework. In a form I want after pressing the Save button two things:
1 - Validate the data entered. that's why I put
<p:message for="date" /> and <p:message for="zone" />
As the values ​​are not correct, the dialog box should not be displayed.
2 - When all data is correct, and I click Save, I want to display my dialog box.
Now I can not. Can you help me? I use version 4 primefaces.
<h:form>
<p:panel id="panel" header="Create" style="margin-bottom:10px;border-color:blueviolet" >
<p:messages id="messages" />
<h:panelGrid columns="3">
<h:outputLabel for="date" value="Date : *" />
<p:calendar locale="fr" id="date" value="#{newBusinessCtrl.exercice.debut}" required="true" label="date" showButtonPanel="true"/>
<p:message for="date" />
<h:outputLabel for="zone" value="Zone Monétaire: *" />
<p:selectOneMenu id="zone" value="#{newBusinessCtrl.exercice.zoneChoice}" >
<f:selectItem itemLabel="Choice " itemValue="" />
<f:selectItems value="#{newBusinessCtrl.exercice.zones}" var="azone"
itemLabel="#{azone}" itemValue="#{azone}" >
</f:selectItems>
<p:message for="zone" />
</p:selectOneMenu>
<p:message for="zone" />
</h:panelGrid>
</p:panel>
<p:commandButton update="panel" value="Save" icon="ui-icon-check" style="color:blueviolet" onclick="choice.show()"/>
<p:confirmDialog message="Would you like to create accounts automatically ?"
header="Account creation" severity="alert"
widgetVar="choice" appendTo="#(body)">
<p:button outcome="personalizeAccount" value="Personalize" icon="ui-icon-star" />
<p:button outcome="autoAccount" value="Continue" icon="ui-icon-star" />
</p:confirmDialog>

Answer 1

Just show the dialog in Backing Bean like this:
Page：
<p:commandButton update="panel" value="Save"
icon="ui-icon-check"
style="color:blueviolet"
action="#{newBusinessCtrl.showDlg('choice')}"/>
Backing Bean：
public void showDlg(String dlgName){
RequestContext.getCurrentInstance().execute(dlgName+".show()");
}
Once the validation failed, the action won't execute and thus the dialog will not show.

Answer 2

If validation hasn't failed. PrimeFaces puts a global args object in the JavaScript scope which in turn has a boolean validationFailed property. You can check it before showing the dialog So you can use it this way:
<p:commandButton value="save" oncomplete="if (args && !args.validationFailed) saveDialog.show()"/>