Javascript calculation in oscommerce page

Hello,
What am I doing wrong ? this code doesn't work in a oscommerce site. Please help me have a look and tell me the problem.
The code:

Expand|Select|Wrap|Line Numbers

 <SCRIPT TYPE="text/javascript">
 
function battery_size()

{

//shove values into variables

var SystemSize = document.forms[0].SystemSize.value;
 
var voltselect = document.forms[0].SYSVOLT.selectedIndex;

var SYSVOLT = document.forms[0].SYSVOLT.options[voltselect].value;
 
var dayselect = document.forms[0].CloudyDays.selectedIndex;

var CloudyDays = document.forms[0].CloudyDays.options[dayselect].value;
 
var limitselect = document.forms[0].DischargeLimit.selectedIndex;

var DischargeLimit = document.forms[0].DischargeLimit.options[limitselect].value;
 
var TempMulti = document.forms[0].TempMulti.value;
 
//calculate result 

var result =(((SystemSize/SYSVOLT)*CloudyDays)/(DischargeLimit*0.01))*TempMulti;

result = Math.round(result);
 
//validate
 
var verify = isNaN(result);

if (verify) {

    alert ("Energy Consumption must be a number");

    document.forms[0].SystemSize.focus();

    return false;

    };
 
// write result to form

document.forms[0].result.value = result;

}

</SCRIPT>

The related form
[HTML] <FORM>
<table width="100%" border="0" cellspacing="4" cellpadding="0">
<tr>
<td colspan="2"> How much storage you would like your battery bank to provide? Base this on the number of days your system will have to provide power without solar input. How many cloudy days in a row are typical for your location? Do you have an alternate source of power—grid intertie or generator—during these days? 
 
It is not good for batteries to be completely drained (ever), nor is it good for them to be consistently undercharged. It is best to size your battery bank so that it gets regularly charged to capacity.
 

When you sized your solar panel array, you were dealing with watts per hour that you need to produce. Now you will be dealing with amps per hour that you need to store. Remember watts = volts X amps. 
</td>
</tr>
<tr>
<td>1. Enter your System Size 
This is the value obtained in step1. Put the number here 
 
</td>
<td width="154"><input name="SystemSize" value=" " maxlength="10" size="5" /> Watts</td>
</tr>
<tr>
<td>2. Enter your system Voltage 
 Choose your system voltage 
 
</td>
<td width="154"><SELECT NAME="SYSVOLT">

<OPTION VALUE="12">12</OPTION>
<OPTION SELECTED VALUE="24">24</OPTION>
<OPTION VALUE="48">48</OPTION>
</SELECT> Volt</td>
</tr>
<tr>
<td>3.Enter the maximum number of consecutive cloudy weather days expected in your area This is the number of days of autonomy you would like your system to support(Generally 3~5days). 
 
</td>
<td width="154"><SELECT NAME="CloudyDays">
<OPTION VALUE="1">1</OPTION>

<OPTION VALUE="2">2</OPTION>
<OPTION SELECTED VALUE="3">3</OPTION>
<OPTION VALUE="4">4</OPTION>
<OPTION VALUE="5">5</OPTION>
<OPTION VALUE="6">6</OPTION>
<OPTION VALUE="7">7</OPTION>
</SELECT> Days</td>
</tr>
<tr>
<td>4. Enter the discharge limit for the batteries The depth of discharge for the battery you have chosen. This provides a safety factor so that you can avoid over-discharging your battery bank. Between 0.2 ~0.8 , an acceptable discharge average is 50% or 0.5 discharge limit 
 </td>
<td width="154"><SELECT NAME="DischargeLimit">
<OPTION VALUE="1">20</OPTION>

<OPTION VALUE="2">30</OPTION>
<OPTION VALUE="3">40</OPTION>
<OPTION SELECTED VALUE="4">50</OPTION>
<OPTION VALUE="5">60</OPTION>
<OPTION VALUE="6">70</OPTION>
<OPTION VALUE="7">80</OPTION>
</SELECT> % </td>
</tr>
<tr>
<td>5. Select the closest multiplier
below for the average ambient winter temperature your batteries
will experience. Enter the multiplier here. </td>
<td width="154"><input type="text" name="TempMulti" size="5" /> </td>
</tr>
<tr> <td>
<table width="180" align="center" border="1" cellspacing="2" cellpadding="0" bgcolor="#dddddd">
<tr>
<td colspan="3">Ambient Temperature Multiplier</td>
</tr>
<tr>
<td>80F</td>
<td>26.7C</td>
<td>1.00</td>
</tr>
<tr>
<td>70F</td>
<td>21.2C</td>
<td>1.04</td>
</tr>
<tr>
<td>60F</td>
<td>15.6C</td>
<td>1.11</td>
</tr>
<tr>
<td>50F</td>
<td>10.0C</td>
<td>1.19</td>
</tr>
<tr>
<td>40F</td>
<td>4.4C</td>
<td>1.30</td>
</tr>
<tr>
<td>30F</td>
<td>-1.1C</td>
<td>1.40</td>
</tr>
<tr>
<td>20F</td>
<td>-6.7C</td>
<td>1.59</td>
</tr></table> </td></tr>
<tr>
<td colspan="2">
<div align="center">
<INPUT NAME="calc" VALUE=" Calculate " TYPE=BUTTON
onClick=battery_size(this.form)></div>
</td>
</tr>
<tr>
<td>
<div align="right">
Total Batteries Capacity Needed: </div>
</td>
<td width="154"><INPUT NAME="result" READONLY SIZE="8" maxlength="8"> Amps/Hour</td>
</tr>

</table>
</FORM>[/HTML]

Oct 6 '07 #1

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1261

acoder

16,027

Expert Mod 8TB

Welcome to TSDN!

When you say it doesn't work, what do you expect it to do instead and what does it do instead? Do you get any errors? If so, what are they?

Please use code tags when posting code, e.g.
[CODE=javascript]
JavaScript code here..
[/code]

Oct 6 '07 #2

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