Checkbox Validation

[smellykat]

I have a table with 2 columns: Vendor Name, Transactions(checkboxes). The amount of checkboxes and their values vary depending on who the vendor is.
For example:
VENDOR NAME TRANSACTIONS
Vendor A name=checkbox value X
name=checkbox value Y
Vendor B name=checkbox value X
name=checkbox value Y
name=checkbox value Z

On clicking next, I need a javascript function that will loop through each vendor in the table and make sure that at least one checkbox is checked for each vendor. So if there are 4 vendors selected into the table by the user, then at least 4 checkboxes should be checked, but more is ok.
Each vendor needs at least one box checked.

Thanks.

 

[AnakinPt]

var blnValorA=false;
for (i=0;i<document.forms['boxes'].length;i++)
{
strValor= document.forms['boxes'].item(i).name;
str=strValor.substr(0,6);
if (str=='vendorA')
{
if (document.forms['boxes'].item(i).checked)
{
blnValorA=true
}
}
}

if (!blnValorA) alert ('You must choose atleast one of the VendorA');
else
//proceed
Anikin
Hugo Alexandre Dias
Web-Programmer
anikin_jedi@hotmail.com

 

[smellykat]

Anikin,

Thanks for your reply. I'm a bit confused as to what this line does:
str=strValor.substr(0,6);

can you explain?

 

[AnakinPt]

it's not a 6 but a 7 for the case i gave you.

This function seeks all the fields of the boxes form and if the fieldname starts by vendorA it sets a flag.

that line, just get the first 6 chars of the strings.

string substr(start,lenght)

substr is a function of a string that extracts a substring starting in the start position with length chars, or until the end of the string. Anikin
Hugo Alexandre Dias
Web-Programmer
anikin_jedi@hotmail.com

 

[smellykat]

This code always gives me the alert no matter whether i check a box or not. Heres the code:

function validateDUN( form )
{ var blnValorA=false;


for (i=0;i<form['transactions'].length;i++)
{
strValor= form['transactions'].item(i).name;
str=strValor.substr(0,6);
if (str=='Vendor')
{
if (form['transactions'].item(i).checked)
{
blnValorA=true
}
}
}

if (blnValorA==false) alert ('You must choose atleast one of the Vendor');

else
return true;
return false;

}

Here are my checkboxes:

<form name=&quot;form2&quot; method=&quot;post&quot; action=
<%
Response.Write(&quot;na_payment_method.asp?ID=&quot;
%> onSubmit=&quot;return validateDUN(this)&quot;>

<td width=&quot;311&quot; align=&quot;left&quot;>
<%
if (rs(&quot;trading_partner&quot == &quot;VendorA&quot; || rs(&quot;trading_partner&quot == &quot;VendorB|| rs(&quot;trading_partner&quot == &quot;VendorC&quot;|| rs(&quot;trading_partner&quot == &quot;VendorD&quot
{
%>
<input type=&quot;checkbox&quot; name=&quot;transactions&quot; value=&quot;<% =rs(&quot;ID&quot %>L1&quot;>Purchase Order, Shipment Notice <br>    and DC Invoice
<br>
<input type=&quot;checkbox&quot; name=&quot;transactions&quot; value=&quot;<% =rs(&quot;ID&quot %>L2&quot;>Direct Store Delivery Invoice
<%
if (rs(&quot;trading_partner&quot == &quot;VendorD&quot
{
%>
<br>
<input type=&quot;checkbox&quot; name=&quot;transactions&quot; value=&quot;<% =rs(&quot;ID&quot %>L3&quot;>Sales Information
<%
}
}
if (rs(&quot;trading_partner&quot == &quot;VendorE&quot
{
%>
<input type=&quot;checkbox&quot; name=&quot;transactions&quot; value=&quot;<% =rs(&quot;ID&quot %>L4&quot;>Purchase Order, Shipment Notice, DC<br>    Invoice and Direct Store Delivery Invoice

<input type=&quot;checkbox&quot; name=&quot;transactions&quot; value=&quot;<% =rs(&quot;ID&quot %>L5&quot;>Item Price Maintenance

<%
}
//proceed....
</form>

 

[AnakinPt]

for (i=0;i<form.length;i++)
{
strValor= form.item(i).name;
str=strValor.substr(0,6);
if (str=='Vendor')
{
if (form.item(i).checked)
{
blnValorA=true
}
}
}


Try this

Cause you had bad names in the form.
Anikin
Hugo Alexandre Dias
Web-Programmer
anikin_jedi@hotmail.com