The two functions below have been extended by MW to handle the single radio button, in addition to the radio button group (more than one radio button from which to select).

The top function can check for a value or just check that one has been selected by passing an '' empty quote as the third variable. The lower function checks only for a specific value/button selected.

Call these functions like:
	var f;
	var hasErrors;
	var errorMsgs;
		. . . 
	
	f = document._FormAbbrev;
	
		. . . 
	
	ClearFldStyle (f.FldNmSub);
	if(!CheckButton(f.FldNm,'Failure message for main field', '')) hasErrors = true;
	if(CheckButton(f.FldNm,'', 'SpecificValueToCheckHere')) {
		if(!IsCBFldChecked(f.FldNmSub,'Failure message for sub field')) hasErrors = true;
	}
_____

function CheckButton(fieldobj, msg, chkvalue) {
 // validate button - field
 var field = (fieldobj.length >0 ) ? fieldobj : [fieldobj];
 var selBtn = -1;
 for (i=field.length-1; i > -1; i--) {
  if (field[i].checked) {
  selBtn = i;
  }
 }
 if (selBtn == -1) {
  // no button selected
  errorMsgs += msg + "\n\r";
  return false;
 } else {
  // a button was selected, check the value
  if (chkvalue=='') {
   return true;
  }
  if (field[selBtn].value == chkvalue) {
   // match, return true
   return true;
  } else {
   // no match, return false
   if (msg != '') {
    errorMsgs += msg + "\n\r";
    return false;
   }
  }
 }
}
function ChkButtonVal(fieldobj, chkvalue) {
 // validate button - field
 var field = (fieldobj.length >0 ) ? fieldobj : [fieldobj];
 var selBtn = -1;
 for (i=field.length-1; i > -1; i--) {
  if (field[i].checked) {
  selBtn = i;
  }
 }
 if (selBtn == -1) {
  // no button selected
  return false;
 } else {
  // a button was selected, check the value
  if (chkvalue=='') {
   return true;
  }
  if (field[selBtn].value == chkvalue) {
   // match, return true
   return true;
  } else {
   // no match, return false
    return false;
  }
 }
}

____________

Function below is the original RCS function. It cannot handle a single radio button.


function CheckButton(field, msg, chkvalue) {
	// validate button - field
	var selBtn = -1;
	for (i=field.length-1; i > -1; i--) {
		if (field[i].checked) {
		selBtn = i;
		}
	}
	if (selBtn == -1) {
		// no button selected
		errorMsgs += msg + "\n\r";
		return false;
	} else {
		// a button was selected, check the value
		if (field[selBtn].value == chkvalue) {
			// match, return true
			return true;
		} else {
			// no match, return false
			if (msg != "") {
				errorMsgs += msg + "\n\r";
				return false;
			}
		}
	}
}

_______________________________________________

call validation with:

if(CheckButton(f.BtnFld, '', 'Yes') ) { 
	if(!CheckField(f.TxtFld, "When the butten is yes, the text field must not be empty.", 1)) hasErrors = true; }


_______________________________________________
Version of CheckButton which allows ANY match for chkvalue
(New logica allows for any value for CheckButton selection is okay, not just testing for certain value)

function CheckButton(field, msg, chkvalue) {
 // validate button - field
 var selBtn = -1;
 for (i=field.length-1; i > -1; i--) {
  if (field[i].checked) {
  selBtn = i;
  }
 }
 if (selBtn == -1) {
  // no button selected
  errorMsgs += msg + "\n\r";
  return false;
 } else {
  // a button was selected, check the value
  if (field[selBtn].value == chkvalue) {
   // match, return true
   return true;
  } else {
   if (chkvalue=='') {
    // ok, no value to check, pass
    return true;
   } else {
    // no match, return false
    if (msg != "") {
     errorMsgs += msg + "\n\r";
     return false;
    }
   }
  }
 }
}