Page_ClientValidate is undefined in formview

I have validators inside a <asp:formview>, in order to show custom validation I am using

if (!Page_ClientValidate("groupName")) {}

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I am getting an error Object Expected. How can I validate client side from the form view?

I use Page_ClientValidate for <asp:listview> and there

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The Page_ClientValidate function may sometimes be undefined, e.g. if there are no validators on the page. Check if typeof Page_ClientValidate === "function" before calling it.

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This would also occur if all validator's EnableClientScript properties are set to false.

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Call the following Javascript function whenever you want and pass the validation group name of your form to it..

        function ValidateForm(ValidationGroupName)
        {
          var validated=Page_ClientValidate(ValidationGroupName); 
          if(validated)
          {
            //do the logic here
            return true;
          }
          else
          {
            return false;
          }
        }

Hope this will help you....