Restricting quantity based on number of items in stock?

We have a field in our product database that details the number in stock of a particular product.

Is it possible to restrict the quantity selected by a user, based on this stock number? For example, if a user attempts to purchase 5 of an item, which only has 1 showing as in stock, an error would be produced informing them of the quantity available.

Sorry, I should add that I don't need the purchasing process to update the stock level, I just need to restrict the quantity, availabile to purchase, based on the stock level.

We're using Classic ASP btw.

Thanks.
Nath.

you could use server validation for this, though it will only work on a detail page with only one add to cart button.

add a hidden form element to the add to cart button form, in the property inspector click the plus button next to initial value and set it to use the available quantity column

add server validation from validation toolkit, select numeric validation.

For the server variable, select the quantity box. in the numeric validation setting set the maximum number to:
<%= Request.Form("qtyAvail") %>


where qtyAvail is the name of the hidden form element.

you can then add a validation show if behavior to show the message when validation fails.

Thank you Jason.

I've getting a syntax error with that...

Microsoft VBScript compilation (0x800A03EA)
Syntax error
/springparknursery/plant-information.asp, line 16, column 79
WAFV_Errors = WAFV_Errors & WAValidateNM(cStr(Request.Form("qtyAvail")) & "",0,<%= Request.Form("qtyAvail")

I assume this is because I am using a form variable as the maximum number value?

How do I set the maximum number to be the hidden form element? I notice the default is set to 100, but when I insert <%= Request.Form("qtyAvail") %> it generates the syntax error.

Hope you can help with that. Thanks.
Nath.

EDIT:

I've tried changing the line of code to the following:
WAFV_Errors = WAFV_Errors & WAValidateNM(cStr(Request.Form("spCART_1_Quantity_Add")) & "",0,Request.Form("qtyAvail"),"",",.",true,1)

...but, whilst this no longer produces a syntax error, the validation doesn't work.

Here's the code for my Add to Cart button:

<form name="spCART_1_ATC_<%=rsH.Fields("heatherID").value%>" method="post" action="<%=cStr(Request.ServerVariables("SCRIPT_NAME"))%><%=WA_eCart_IIf((Request.ServerVariables("QUERY_STRING") <> ""), "?" & Request.ServerVariables("QUERY_STRING"), "")%>">
<input type="hidden" name="spCART_1_ID_Add" value="<%=rsH.Fields("heatherID").value%>" />
<p>Quantity: <br />
<input type="text" name="spCART_1_Quantity_Add" value="1" size="6" style="width: 40px;height: 20px;border: 2px solid #BACBBE;padding: 6px 0px 6px 8px;margin: 0;color: #18440D;font:14px Arial, Helvetica, sans-serif;font-weight: normal;vertical-align:middle;" />
<input type="image" src="heather-plants/btn-addtobasket.png" value="Add to Cart" name="spCART_1_ATC" alt="Add to Basket" style="vertical-align:middle;" />
<input name="qtyAvail" type="hidden" id="qtyAvail" value="<%=(rsH.Fields.Item("heatherinstock").Value)%>" />
</p>
</form>

...and here is the server validation code:

<%
if (cStr(Request.Form("spCART_1_ATC.x")) <> "") then
WAFV_Redirect = "plant-information.asp"
Session("WAVT_plantinformation_Errors") = ""
if (WAFV_Redirect = "") then
WAFV_Redirect = cStr(Request.ServerVariables("SCRIPT_NAME"))
end if
WAFV_Errors = ""
WAFV_Errors = WAFV_Errors & WAValidateNM(cStr(Request.Form("spCART_1_Quantity_Add")) & "",0,Request.Form("qtyAvail"),"",",.",true,1)

if (WAFV_Errors<> "") then
PostResult WAFV_Redirect,WAFV_Errors,"plantinformation"
end if
end if
%>

can you send a copy of your page so i can see the code in context.

Hi Jason,

Copy of the page, attached. Thank you.

Regards
Nath.

the code looks correct, can you post a link where i can see the issue.

I've uploaded that to a temporaty page at:
plant-informationTEST.asp?hid=133

I've added details of the "quantity available" just below the price so you know how many to enter in the quantity box in order to trigger the validation error.

Appreciate the help, as ever.
Regards
Nath.

Do you think it's a problem with the form?

<form name="spCART_1_ATC_<%=rsH.Fields("heatherID").value%>" method="post" action="<%=cStr(Request.ServerVariables("SCRIPT_NAME"))%><%=WA_eCart_IIf((Request.ServerVariables("QUERY_STRING") <> ""), "?" & Request.ServerVariables("QUERY_STRING"), "")%>">
<input type="hidden" name="spCART_1_ID_Add" value="<%=rsH.Fields("heatherID").value%>" />
<p>Quantity: <br />
<input type="text" name="spCART_1_Quantity_Add" value="1" size="6" style="width: 40px;height: 20px;border: 2px solid #BACBBE;padding: 6px 0px 6px 8px;margin: 0;color: #18440D;font:14px Arial, Helvetica, sans-serif;font-weight: normal;vertical-align:middle;" />
<input type="image" src="heather-plants/btn-addtobasket.png" value="Add to Cart" name="spCART_1_ATC" alt="Add to Basket" style="vertical-align:middle;" />
<input name="qtyAvail" type="hidden" id="qtyAvail" value="<%=(rsH.Fields.Item("heatherinstock").Value)%>" />
</p>
</form>

I've tried deleting and rebuilding the page but the validation just doesn't work. As you say, everything seems to be in place.

Hope you can help with that. Thank you.
Regards
Nath.

Hi Jason,

I think it's a problem with using a form variable in the validation script. I tried just adding a number, instead of the form variable, and it appears to work.

Do you know how I would change the code to allow entry of the form variable? I assume it's the quotes in the 'Request.Form("qtyAvail")' that's causing the issue?

For example, this works:
WAFV_Errors = WAFV_Errors & WAValidateNM(cStr(Request.Form("PPcart_1_Quantity_Add")) & "",0,5,"",",.",true,1)

But this doesn't:
WAFV_Errors = WAFV_Errors & WAValidateNM(cStr(Request.Form("PPcart_1_Quantity_Add")) & "",0,Request.Form("qtyAvail"),"",",.",true,1)

How do I comment out the quotes? Appreciate the help, thank you.
Nath.

I have created a support ticket so we can look into this issue further.

To view and edit your support ticket, please log into your support history:
supporthistory.php

If anyone else is experiencing this same issue, please append to this thread.