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Javascript to sum drop down values

Thread began 5/17/2009 7:12 am by rdubill357341 | Last modified 5/20/2009 7:27 am by rdubill357341 | 18424 views | 5 replies


Javascript Sum Drop Down Values

Ray - I have downloaded a simple javascript that adds up the values for multiple checkboxes on a page if the visitor checks the boxes - this works fine - and it displays the total on the same page...

Here is the function, script and HTML:

<script type="text/javascript" src="autoSumCheckboxes.js"></script>
function UpdateCost() {
var sum = 0;
var gn, elem;
for (i=0; i<29; i++) {
gn = 'prod'+i;
elem = document.getElementById(gn);
if (elem.checked == true) { sum += Number(elem.value) }
document.getElementById('totalcost').value = sum.toFixed(2);

<td><input type="checkbox" id='prod1' value="425.00" onclick="UpdateCost()" />
$ 425.00</td>
<td>T-5208-34M or L</td>
<td colspan="2">Helmet Impact Liner, medium or large</td>
<td><input type="checkbox" id='prod2' value="245.00" onclick="UpdateCost()" />
$ 245.00</td>

I now need to set up a drop down (select list) that will do the same for the values in the select list..

This does not work and the total field is blank:

<td width="169"><form id="form1" name="form1" method="post" action="">
<select name="joe" id="prod0" onchange="MM_callJS('UpdateCost()')">
<option value="100.00">one</option>
<option value="200.00">two</option>

I'm sure the function and select list has to change but I've tried several times - no luck...


thanks in advance....

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