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multiplying two dropdown menu values

Thread began 10/05/2009 10:24 am by sz473390560 | Last modified 10/06/2009 1:27 pm by sz473390560 | 8368 views | 2 replies


multiplying two dropdown menu values

Hi I am pretty new to Japascript, and have been trying to multiply the values of two dropdown menus

<td><form action="index.php?c=ref">
<select id="RLA" name="RLA" size="1" onchange="totalA(this.value);" >
<option value="">...</option>
<option value="10">10</option>
<option value="20">20</option>
<option value="30">30</option>
<option value="40">40</option>
<select id="RLB" name="RLB" size="1" onchange="totalB(this.value);">
<option value="">Choose One...</option>
<option value="0.55">x4 @ $0.55 each</option>
<option value="1.00">x8 @ $1.00</option>
<option value="1.30">x13 @ $1.30</option>
<input type="button" class="butt2" value="Buy Now" />
<td>Total: <input id="show" name="show" type="text" value="$0.00" size="3" /></td>

The Javascript that is supposed to work with it is

var numA = 0;
function totalA(valA) {
if (valA && document.getElementById(valA)) {
numA = eval(valA);

var numB = 0;
function totalB(valB) {
if (valB && document.getElementById(valB)) {
numB = eval(valB);
var tots = "$" + (numA * numB);
document.write("show").value = "$" + tots;

I have searched the web, exhausted my brain and am ready to have an aneurysm.
Basically I am trying to show the value of the selected two options before purchase.
Can someone help me?

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