Ruby on Rails is way overkill for this... this is pretty basic client-side
javascript functionality
quick and dirty version below, season to taste
<script type="text/javascript">
function update(source)
{ var i,number,temp=""
// valid number, no-decimal
if ( !isNaN(source.value) && (source.value.indexOf(".")==-1) &&
// assign value to number and test greater than 0
(number=parseInt(source.value,10))>0 )
{ for (i=0;i<number;i++)
temp+="<input type='text' name='value"+i+"'><br>"
document.getElementById("updateMe").innerHTML=temp
}
else
alert("Error: Positive integer required")
}
</script>
<form>
How many? <input type=text onchange="update(this)">
<div id="updateMe">
</div>
</form>
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