Xpages radio button validation by groupName? - validation

Question

I have radio buttons in a table with the same groupName.
Is there a relatively simple way to validate this field upon submitting the form without using CCJS?
<xp:td>
<xp:radio id="radio120" groupName="R_1" value="#{document1.R_1}" selectedValue="1"></xp:radio>
</xp:td>
<xp:td>
<xp:radio id="radio120" groupName="R_1" value="#{document1.R_1}" selectedValue="2"></xp:radio>
</xp:td>
With regular Radio Button Group controls, I use validateRequired with an errorMessage control to display a message.
<xp:radioGroup styleClass="A2" style="border:0px;" value="#{document1.Necktie}" layout="pageDirection" id="Necktie">
<xp:this.validators>
<xp:validateRequired message="REQUIRED!"></xp:validateRequired>
</xp:this.validators>
<xp:selectItem itemLabel="No" id="selectItem13"></xp:selectItem>
<xp:selectItem itemLabel="Yes" id="selectItem14"></xp:selectItem>
</xp:radioGroup>
<xp:message id="message10" for="Necktie"></xp:message>

Answer 1

Use the data source document1 on server side to find out if one of your radio buttons was selected.
Test for document1.getItemValueString("R_1"). If it is empty set an error message and return false. Otherwise save the document.
<xp:button value="Save" id="button1">
<xp:eventHandler event="onclick" submit="true"
refreshMode="complete">
<xp:this.action><![CDATA[#{javascript:
if (document1.getItemValueString("R_1") == "") {
facesContext.addMessage(null,
new javax.faces.application.FacesMessage("select a radio"));
return false;
}
document1.save();
}]]></xp:this.action>
</xp:eventHandler>
</xp:button>
<xp:messages id="messages1" />

Answer 2

Fair enough... In that case, outside of doing something with CSJS, I'm not too sure....
Not sure if this is going to help, but have a look at this post by Marky Roden:
https://xomino.com/2012/03/10/checking-xpages-radio-buttons-have-been-selected-with-jquery/
I haven't been doing any development work for 4/5 weeks as year end comes up so my brain isnt really working like it should.....