hi all, does anyone know how to check if a list object is empty. Using the following code i am getting an error, any thoughts: [FORM SIDE OF CODE] <TD><INPUT TYPE="checkbox" NAME="delete:list" VALUE="<!--#var product_id-->"></TD> [FORM PROCESSING SIDE] <!--#in delete--> <!--#var sequence-item--> <!--#else--> Sorry, no deletions <!--#/in--> So, what am i doing wrong? Cheers for any help Wom.
wombat_harness@hotmail.com wrote:
hi all,
does anyone know how to check if a list object is empty. Using the following code i am getting an error, any thoughts:
[FORM SIDE OF CODE]
<TD><INPUT TYPE="checkbox" NAME="delete:list" VALUE="<!--#var product_id-->"></TD>
[FORM PROCESSING SIDE]
<!--#in delete--> <!--#var sequence-item--> <!--#else--> Sorry, no deletions <!--#/in-->
So, what am i doing wrong?
An unfortunate feature of HTML checkboxes is that unchecked checkboxes aren't included in the form, so in your case, you don't have an empty list. You don't have a list at all. Fortunately, the if tag can deal with this: <!--#if delete--> <!--#in delete--> <!--#var sequence-item--> <!--#/in--> <!--#else--> Sorry, no deletions <!--#/if--> Jim -- Jim Fulton mailto:jim@digicool.com Python Powered! Technical Director (888) 344-4332 http://www.python.org Digital Creations http://www.digicool.com http://www.zope.org Under US Code Title 47, Sec.227(b)(1)(C), Sec.227(a)(2)(B) This email address may not be added to any commercial mail list with out my permission. Violation of my privacy with advertising or SPAM will result in a suit for a MINIMUM of $500 damages/incident, $1500 for repeats.
Not that this is terribly critical, but wouldn't it make sense to allow the 'in' tag to deal with it as well? Would having 'in' treat undefined names as empty sequences introduce too much scope for confusion, or would it make for more consistency? IMHO the latter seems more likely. ----- Original Message -----
An unfortunate feature of HTML checkboxes is that unchecked checkboxes aren't included in the form, so in your case, you don't have an empty list. You don't have a list at all. Fortunately, the if tag can deal with this:
<!--#if delete--> <!--#in delete--> <!--#var sequence-item--> <!--#/in--> <!--#else--> Sorry, no deletions <!--#/if-->
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