[thelist] validating radio buttons

[Cymbala, Greg]

Here's one that I've used -- pass in a reference to a radio button
(array/collection of radio buttons, usually) and it'll give you either a
blank string, or the value of the selected radio button.  One problem -- if
you have a radio button whose value is "", it could cause confusion, but you
could adapt it to return null or something instead of a zero-length string.

function getSelectedRadioValue (oRadio) {
  var vReturn = "";
  if (oRadio) { // Check that there is a radio!
    if (!oRadio.length) {
      // oRadio exists, but length is 0?
      if (oRadio.checked) {
        return oRadio.value;
      } else {
        return vReturn;
      }
    }
    if (oRadio.length == 1) {
      // Only one radio button - return its value ???
      if (oRadio[0].checked) {
        vReturn = oRadio[0].value;
      }
    } else {
      // More than one radio button
      for (i = 0; i < (oRadio.length); i++) {
        if (oRadio[i].checked) {
          // Return the checked radio button's value
          vReturn = oRadio[i].value;
          break;
        }
      }
    }
  } else {
    // There's no oRadio
  }
  return vReturn;
}


-----Original Message-----
From: Andrew LaVallee [mailto:andrew at andrewlavallee.com]
Sent: Thursday, July 11, 2002 3:47 PM
To: thelist at lists.evolt.org
Subject: [thelist] validating radio buttons


Is there a way to JS-validate radio buttons to make sure that users select
one? I can pre-populate one, but I'd prefer to keep them totally blank.


..............................
Andrew LaVallee
andrew at andrewlavallee.com
http://www.andrewlavallee.com/



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