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javascript validate multiple radio buttons

Posted on 2008-10-08
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Last Modified: 2012-05-05
Have a bunch of radio buttons on an ASP page:
q1 with 4 buttons (possible answers)
q2 with 2 buttons
q3 with 4 buttons
etc.

Wondering if there is a quick way of implementing a Javascript function to ensure that all questions have been answered.

Keep in mind that we have approx. 12 pages with 10 questions per page!
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Question by:markm5i
3 Comments
 
LVL 44

Expert Comment

by:scrathcyboy
ID: 22674903
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LVL 82

Expert Comment

by:hielo
ID: 22675375
refer to the attached example:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
 "http://www.w3.org/TR/html4/loose.dtd">
 
<html>
<head>
<title></title>
<script type="text/javascript">
function getElementsByName(f,n){
	var e=new Array();
	for(var i=0; i < f.elements.length; ++i)
	{
		if(f.elements[i].name==n)
			e[e.length]=f.elements[i];
	}
return e;
}
function validate(f)
{
	var radioList="q1,q2,q3,q4";
	var messages={
		"total":4
		,"q1":"Question 1 is a required field"
		,"q2":"Question 2 is a required field"
		,"q3":"Question 3 is a required field"
		,"q4":"Question 4 is a required field"
	};
 
	radioList=radioList.split(",");
	for(var i=0; i < radioList.length; ++i)
	{
		var chk=false;
		var t = getElementsByName(f,radioList[i]);
		for( var j=0; j < t.length; ++j)
		{
			if(t[j].checked)
			{
				chk=true;
				break;
			}
		}
		if( chk )
		{
			delete(messages[ radioList[i] ]);
			--messages.total;
		}
	}
	for( k in messages)
	{
		if(k!="total")
			alert(messages[k]);
	}
return (messages.total==0);
}
</script>
</head>
<body>
<form onsubmit="return validate(this)">
<div>Q1:...
	<input type="radio" name="q1" value=""/>
	<input type="radio" name="q1" value=""/>
	<input type="radio" name="q1" value=""/>
	<input type="radio" name="q1" value=""/></div>
<div>Q2:...
	<input type="radio" name="q2" value=""/>
	<input type="radio" name="q2" value=""/></div>
<div>Q3:...
	<input type="radio" name="q3" value=""/>
	<input type="radio" name="q3" value=""/>
	<input type="radio" name="q3" value=""/></div>
<div>Q4:...
	<input type="radio" name="q4" value=""/>
	<input type="radio" name="q4" value=""/>
	<input type="radio" name="q4" value=""/>
	<input type="radio" name="q4" value=""/></div>
	
	<input type="submit"/>
</form>
</body>
</html>

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Accepted Solution

by:
Michel Plungjan earned 500 total points
ID: 22676305
Not trying to poach your question, but is this not a LOT simpler (and it handles a single radio)
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
 "http://www.w3.org/TR/html4/loose.dtd">
 
<html>
<head>
<title></title>
<script type="text/javascript">
var radioList="q1,q2,q3,q4,q5".split(",");
 
function getChecked(rad) {
  if (!rad.length) return rad.checked;
  for (var i=0;i<rad.length;i++) if (rad[i].checked) return true;
  return false
}
function validate(f) {
  for(var i=0; i < radioList.length; ++i) {
    var chk=false;
    var rad = f.elements[radioList[i]];
    if (!getChecked(rad)) {
      alert('Please check at least one radio in question ' + radioList[i])
      if (rad.length) rad[0].focus(); else rad.focus();
      return false
    }
  }
  return true;
}
</script>
</head>
<body>
<form onsubmit="return validate(this)">
<div>Q1:...
	<input type="radio" name="q1" value=""/>
	<input type="radio" name="q1" value=""/>
	<input type="radio" name="q1" value=""/>
	<input type="radio" name="q1" value=""/></div>
<div>Q2:...
	<input type="radio" name="q2" value=""/>
	<input type="radio" name="q2" value=""/></div>
<div>Q3:...
	<input type="radio" name="q3" value=""/>
	<input type="radio" name="q3" value=""/>
	<input type="radio" name="q3" value=""/></div>
<div>Q4:...
	<input type="radio" name="q4" value=""/>
	<input type="radio" name="q4" value=""/>
	<input type="radio" name="q4" value=""/>
	<input type="radio" name="q4" value=""/></div>
<div>Q5:...
	<input type="radio" name="q5" value=""/>
</div>
	
	<input type="submit"/>
</form>
</body>
</html>

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