Primefaces dataTable single selection validation - validation

Question

I can validate a p:selectOneMenu like this:
<p:selectOneMenu id="eventTimezoneDropdown"
value="#{myBean.eventTimeZone}"
required="true"
requiredMessage="The TimeZone must be specified."
effect="none">
<f:selectItems value="#{myBean.timeZoneItems}"/>
</p:selectOneMenu>
Conceptually speaking, using a p:dataTable with single row selection will achieve the same goal - it allows you to select one row using a selection attribute instead of value attribute and using value attribute instead of <f:selectItems>.
<p:dataTable id="ActivitiesTable" var="row"
value="#{myBean.rows}"
selection="#{myBean.selectedRow}"
rowKey="#{row.activityId}">
<p:column selectionMode="single"/>
...
</p:dataTable>
However I don't see any validation options (e.g. a required attribute) on the p:dataTable.
Is there a way or workaround to have a required selection validation on a p:dataTable similar to the required attribute on p:selectOneMenu?
Environment: Primefaces 5.3, JSF 2.2.8-14, Tomcat 7.0.68.

Answer 1

what i know in primefaces there are not this functionality in datatable, but you can play with your code,
i suggest that you can do the same event in your ManagedBean, so you can check if a row is selected or not, if yes then ok else you can create a simple message, that notifie the user that the selection of a row is required like that:
public void requiredSelect() {
if (myObject == null) {
FacesContext.getCurrentInstance().addMessage(null, new FacesMessage(
FacesMessage.SEVERITY_ERROR, "Error", "My object is required!"));
}
}

Answer 2

Another way to work around this issue is by using a hidden input field, bound to the same value which gets updated on row select.
<p:dataTable id="ActivitiesTable" var="row"
value="#{myBean.rows}"
selection="#{myBean.selectedRow}"
rowKey="#{row.activityId}">
<p:ajax event="rowSelectRadio" update="#parent:hiddenTimezoneInput"
<p:column selectionMode="single"/>
...
</p:dataTable>
<h:inputHidden id="hiddenTimezoneInput" value="#{myBean.selectedRow}"
required="true" requiredMessage="The TimeZone must be specified."/>
This way, you can add regular validators on the inputHidden (such as required) and have it processed on form submit.