Hi,
I'm trying to do something similar. This is my javascript - <script type='text/javascript'>
-
function totalise(price,total)
-
{
-
var qty = window.document.getElementById('qty').value;
-
var result = total;
-
result.value = price * qty;
-
}
-
</script>
And this is my select menu and total field (in php) -
<td>
-
<select id='qty' onChange=totalise($price,total{$i})>
-
<option value='0'>0</option>
-
<option value='1'>1</option>
-
<option value='2'>2</option>
-
<option value='3'>3</option>
-
<option value='4'>4</option>
-
<option value='5'>5</option>
-
<option value='6'>6</option>
-
</select>
-
</td>
-
<td>$ <input id='total{$i}' type='text' readonly /></td>
The values seemed to get past through to the function okay so I'm lost as to why the fields aren't being updated...
8  36300 
Hi everyone.
I'm trying to create a shopping cart (with PHP) and it's all going pretty good. Except I'm trying to make a quantity drop down menu which when you change the quantity the total field is updated... I had it working for one, but when I tried to implement it into a for loop (so that when there are more than one item on the page they work separately) nothing happens.
Here is my javascript -
<script type='text/javascript'>
-
-
function totalise(price,total)
-
{
-
var qty = window.document.getElementById('qty').value;
-
var result = total;
-
result.value = price * qty;
-
}
-
</script>
-
and here is a section of my PHP inside the for loop, $price comes from a database (and works) and $i is just the loop count number -
<td>
-
<select id='qty' onChange=totalise($price,total{$i})>
-
<option value='0'>0</option>
-
<option value='1'>1</option>
-
<option value='2'>2</option>
-
<option value='3'>3</option>
-
<option value='4'>4</option>
-
<option value='5'>5</option>
-
<option value='6'>6</option>
-
</select>
-
</td>
-
<td>$ <input id='total{$i}' type='text' readonly /></td>
-
Any questions just ask! Thanks in advance!
acoder 16,027
Recognized Expert Moderator MVP
Merged post/threads + split first post from another thread.
acoder 16,027
Recognized Expert Moderator MVP
Don't use "total{$i}" . Use something like total or total2.
Using total{i} takes the number of the loop and adds it to the total name
so when it runs it would be read as
total0
total1
total2
... which is what i should be using right?
-
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
-
-
<html>
-
<head>
-
<title>Random images same url</title>
-
</head>
-
-
<body>
-
-
<table>
-
<td>
-
<select id="qt" onChange="totalise()">
-
<option value="0">0</option>
-
<option value="1">1</option>
-
<option value="2">2</option>
-
<option value="3">3</option>
-
<option value="4">4</option>
-
<option value="5">5</option>
-
<option value="6">6</option>
-
</select>
-
</td>
-
<td>
-
<select id="itemPrice" onChange="totalise()">
-
<option value="0">0</option>
-
<option value="1">1</option>
-
<option value="2">2</option>
-
<option value="3">3</option>
-
<option value="4">4</option>
-
<option value="5">5</option>
-
<option value="6">6</option>
-
</select>
-
<td>
-
<td><input id="total" type="text" readonly /></td>
-
</table>
-
-
</body>
-
-
<script type='text/javascript'>
-
-
function totalise() {
-
var qtd = document.getElementById('qt').value;
-
var price = document.getElementById('itemPrice').value;
-
var result = document.getElementById("total");
-
result.value = price * qtd;
-
}
-
</script>
-
-
</html>
-
That helps?
Ummm, no not really because my problem is that I want to implement this code into a loop, and I'm not sure how to...
Thanks anyway
I've figured out how to loop the id names I did it like this (where $i is the loop number), and looking at the source code when I view the page it is working fine -
<select id='qty{$i}' onChange=totalise($price,total{$i},qty{$i})>
-
<option value='0'>0</option>
-
<option value='1'>1</option>
-
<option value='2'>2</option>
-
<option value='3'>3</option>
-
<option value='4'>4</option>
-
<option value='5'>5</option>
-
<option value='6'>6</option>
-
</select>
-
</td>
-
<td>$ <input id='total{$i}' type='text' readonly size='4'/></td>
-
I thought by passing the values $total{$i} and qty{$i} to the javascript as variables so they may then call the proper id names (i.e. total0, qty0), then it would work...
This is my javascript code - <script type='text/javascript'>
-
function totalise(price,ttl,qt)
-
{
-
var qty = window.document.getElementById(qt).value;
-
var total = window.document.getElementById(ttl).value;
-
var result = total;
-
result.value = price * qty;
-
}
To me it looks like it should work, can anyone point out something I've done wrong?
Thanks again.
Finally got it working, thanks to everyone who helped.
My last problem was passing total{$i} and qty{$i} through to the function, guess the javascript didnt like it...
For anyone who wants to know how I got it to work here is my working:
javascript : -
<script type='text/javascript'>
-
function findTotal(price,i)
-
{
-
var qtd = document.getElementById('qty'+i).value;
-
var result = document.getElementById('total'+i);
-
result.value = price * qtd;
-
}
-
</script>
And my working PHP/HTML (implemented into a for loop): -
<select id='qty{$i}' onChange='findTotal($price,$i)'>
-
<option value='0'>0</option>
-
<option value='1'>1</option>
-
<option value='2'>2</option>
-
<option value='3'>3</option>
-
<option value='4'>4</option>
-
<option value='5'>5</option>
-
<option value='6'>6</option>
-
</select>
-
-
$ <input id='total{$i}' type='text' readonly size='4'>
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