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multiplying two dropdown menu values

Thread began 10/05/2009 7:24 am by sz473390560 | Last modified 10/06/2009 10:27 am by sz473390560 | 13435 views | 2 replies

Justin Nemeth

Try this code. Basically, you have to access the values for a select list a little different than with a basic input field. And to set the value, you would use document.getElementById('show') to get a reference to your text field.

<td><form action="index.php?c=ref">
<select id="RLA" name="RLA" size="1" onchange="totalA(this);" >
<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);">
<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>

var numA = 0;
function totalA(selectA) {
if (selectA && selectA.selectedIndex) {
numA = selectA.options[selectA.selectedIndex].value;

var numB = 0;
function totalB(selectB) {
if (selectB && selectB.selectedIndex) {
numB = selectB.options[selectB.selectedIndex].value;

var tots = numA * numB;
document.getElementById("show").value = "$" + tots;


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