How to make one of 3 radio button to be checked using jquery.

I have 3 radio buttons like
<asp:radiobutton id="r1" runat="server" Text="Pf"/>
<asp:radiobutton id="r1" runat="server" Text="Pv"/>
<asp:radiobutton id="r1" runat="server" Text="Invalid"/>

I want the user should click atleast once otherwise the message should come.
searchsanjaysharmaAsked:
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Meir RivkinFull stack Software EngineerCommented:
add GroupName="radiobuttons" to each on of the asp:radiobutton and use this:
<asp:radiobutton id="r1" runat="server" Text="Pf" GroupName="radiobuttons"/>
<asp:radiobutton id="r1" runat="server" Text="Pv" GroupName="radiobuttons"/>
<asp:radiobutton id="r1" runat="server" Text="Invalid" GroupName="radiobuttons"/>

 if ($("input[name='radiobuttons']:checked").length) {
           // at least one of the radio buttons was checked
      }
      else {
           // no radio button was checked
      }

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searchsanjaysharmaAuthor Commented:
tx
0
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