Javascript for loop problem.

a page that im working on loads a table with information from a database using xajax. i have the number of items in the table and each item has a unique id but when i go to process the changes the user makes i get the error "document.getElementById("upc_" + i) has no properties". thought if i remove the for loop i get the first upc and no error. below is my javascript function.


function insert_upc()
{
var num = document.getElementById("num_rows").value;

var i = 0;
for(i=0;i<=num;i++)
{
var upc = document.getElementById("upc_" + i).value;

document.getElementById("list").innerHTML = i;
//xajax_import_upcs(id, upc);
}
}


<tr bgcolor="#ededed">
<td rowspan="2"><input name="checkbox" value="checkbox" checked="checked" type="checkbox"></td>
<td>SKU: B111 ---- Color: Midnight ---- Size: 34 X 30</td>
<td rowspan="2">035481266126<input value="2056165" id="id_80" type="hidden"><input value="035481266126" id="upc_80" type="hidden"></td>
</tr>

Are all of the numbers in the IDs sequential?

You could try this:

i still see that it will not work


because

the num is not parsed in integer

do like this

Specifying the second argument will keep the number from being treated as octal if the number ever has a leading zero.

thanks alot for the help. the parseInt fixed the problem.