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javascript calculate multiple textboxes

Posted on 2009-05-09
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Last Modified: 2012-05-06
Hi all,
I have a javascript that takes values of textboxes and calculates them out.  What I need to do is tweak my script so I can use multiple "products".  I was thinking of appending a unique string in the beginning of the name/id of each textbox then using match expression or preg (??? not sure if they are correct terms) to have the script find the unique sets and calculate them accordingly.
ie.
set1= QTY11_somename * PRICE11_somename
set2= QTY5999_somename * PRICE5999_somename
set3=QTYd_somename * PRICEd_somename
then have the script take the sum of all of the sets to calculate the totals...
In my script so far, the names are hard coded (only 1 set).  I need multiple sets with 1 set of totals... see my example:
<script type="text/javascript">
onload = function(){
document.getElementById("calc").onclick = function(){
var form = this.form;
form.subtotal.value = (form.qty.value * form.price.value).toFixed(2);
form.tax.value = (form.subtotal.value * form.taxrate.value).toFixed(2);
form.total.value = ((form.qty.value * form.price.value) + (form.subtotal.value * form.taxrate.value)).toFixed(2);
}
}
</script>
 
<form>
Quantity: <input name='qty' /><br>
Price: <input name='price' /><br>
Tax Rate: <input name="taxrate" value="0.0825"/><br>
Subotal: <input name="subtotal" readonly="readonly" /><br>
Tax: <input name="tax" readonly="readonly" /><br>
Total: <input name="total" readonly="readonly" /><br>
<input type="button" value="Calculate" id="calc" />
</form>

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Question by:newbe101
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7 Comments
 
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mudbuggle earned 250 total points
ID: 24345358
Are you using a server side language?
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LVL 42

Assisted Solution

by:David S.
David S. earned 250 total points
ID: 24345507
I would assume newbe101 is using PHP since he mentions the preg functions (which is a PHP thing) and has asked many questions in the PHP zone.

In JavaScript the String.match function is used for that kind of thing: https://developer.mozilla.org/en/Core_JavaScript_1.5_Reference/Global_Objects/String/match

Keep in mind that the readonly attribute can be disabled, so you should always validate anything set in such a field, just like normal fields.
0
 

Author Comment

by:newbe101
ID: 24345545
yes... its php... and I have asked A LOT of questions in the php zone... lol.  I am going to checkout your link.
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Author Comment

by:newbe101
ID: 24345656
didn't get me anywhere... it just showed me how to seach a string, but I still don't know how to use it in my code...
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Author Comment

by:newbe101
ID: 24348806
*bump*
0
 

Author Comment

by:newbe101
ID: 24375757
help, please...
0
 

Author Comment

by:newbe101
ID: 24384380
no more suggestions?
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