I have a setup with exactly what you mentioned. Free format performing just like a constant sum question. I have a free format question called 'Q7' with 5 rows and a total row defined (Q7_r1 through Q7_r5 and Q7_tot.
Under the advanced settings option on the HTML <Head> Tag I have:
<script type="text/javascript">
function calcSum()
{
var Sum = 0;
Sum = Number(document.getElementById("Q7_r1").value)
+ Number(document.getElementById("Q7_r2").value)
+ Number(document.getElementById("Q7_r3").value)
+ Number(document.getElementById("Q7_r4").value)
+ Number(document.getElementById("Q7_r5").value);
document.getElementById("Q7_tot").value = Sum;
}
</script>
Then on the Custom Javascript verification tab I have:
var var1=SSI_GetValue ("Q7_r1")
var var2=SSI_GetValue ("Q7_r2")
var var3=SSI_GetValue ("Q7_r3")
var var4=SSI_GetValue ("Q7_r4")
var var5=SSI_GetValue ("Q7_r5")
var vartot=var1+var2+var3+var4+var5;
if (vartot != 100) {strErrorMessage = "Your total must equal 100%";}
And lastly, here is the grid setup for reference:
<table border="1" cellpadding="1" cellspacing="0" width="60%">
<tr>
<td width="40%"> <b>Animal Type</b> </td>
<td> <b>% Personal Contact Time</b> </td>
</tr>
<tr>
<td> Canine </td>
<td> <input name="Q7_r1" id="Q7_r1" type="text" size="3" onblur="calcSum()">% </td>
</tr>
<tr>
<td> Feline </td>
<td> <input name="Q7_r2" id="Q7_r2" type="text" size="3" onblur="calcSum()">% </td>
</tr>
<tr>
<td> Avian (other than poultry) </td>
<td> <input name="Q7_r3" id="Q7_r3" type="text" size="3" onblur="calcSum()">% </td>
</tr>
<tr>
<td> Exotic pets </td>
<td> <input name="Q7_r4" id="Q7_r4" type="text" size="3" onblur="calcSum()">% </td>
</tr>
<tr>
<td> Other Pets or Animals </td>
<td> <input name="Q7_r5" id="Q7_r5" type="text" size="3" onblur="calcSum()">% </td>
</tr>
<tr>
<td> <b>TOTAL</b> </td>
<td> <b><input name="Q7_tot" id="Q7_tot" size="3">%</b> </td>
</tr>
</table>
This will update the total as the answers are put in and will require it to add to 100%. Hope this helps you.
