[Zope] Using batch variables in expressions

[Ian Blenke]

Here's the test form method "foo_test".
	<dtml-var standard_html_header>
	<form action="foo">
	<input name="first" type="hidden">
	<input name="last" type="hidden">
	<input name="email" type="hidden">
	<input type="submit" value="&Submit">
	</form>
	<dtml-var standard_html_footer>

Here's the method you wrote, named "foo" here, with a few changes:

	<dtml-let required="['first', 'last', 'email']">
		<dtml-in required>
			<dtml-if expr="REQUEST.form[_['sequence-item']]">
			   <dtml-var sequence-item> exists
			</dtml-if>
		</dtml-in>
	</dtml-let>

This shows that all fields exist.

Perhaps someone else can expound on how you can trap the error that
occurs when the element is missing from REQUEST.form[]

- Ian

-----Original Message-----
From: Ben Glazer [mailto:glazer@scicomp.com]
Sent: Tuesday, October 26, 1999 6:14 PM
To: Zope Mailing List
Cc: Robert Young; Elaine Kant
Subject: [Zope] Using batch variables in expressions


I want to verify that certain fields in a form have been entered.  Here's a
code snippet I've tried to use:

<dtml-let required="('first', 'last', 'email')">
	<dtml-in required>
		<dtml-if expr="REQUEST.form[sequence-item]">
		   <dtml-var sequence-item> exists
		</dtml-if>
	</dtml-in>
</dtml-let>


Naturally, I get an error when this is executed, since Python interprets
"sequence-item" in the dtml-if as subtracting item from sequence.  I thought
<dtml-var sequence-item> might work, but apparently that sort of thing is
not allowed in an expression.

Is there a way to access the value of sequence-item in an expression?  If
not, how could I go about verifying that form fields are entered correctly?

As a side note, is there any good reason that sequence-item isn't spelled
sequence_item?  Just curious...


Thanks,
Ben


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