Posting And Editing <dtml-calendar> Entries

By Jon Udell

January 21, 2000

(A Zope Primer :  Page 3 of 3 )

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A Zope Primer Displaying ZODB Properties In <dtml-calendar> Posting And Editing <dtml-calendar> Entries

Here's editCalPropForm:

<dtml-var standard_html_header> <form action="editCalendarProperty"> <input name="prop" type="hidden" value="<dtml-var prop>"> <b><dtml-var prop></b>: <br> <textarea name="propval" rows="15" cols="65" wrap="hard"> <dtml-var propval> </textarea> <br> <input type="submit" value="edit"> </form> <dtml-var standard_html_footer>

It produces a form like the one shown in this image:

If the current day's property does not yet exist, the TEXTAREA will contain 'None'.

The action wired to this form is an external method, editCalendarProperty:

def editCalendarProperty(self,REQUEST,RESPONSE):
if ( self.hasProperty(REQUEST['prop']) ):
self.manage_changeProperties({ REQUEST['prop'] : REQUEST['propval'] })
else:
self.manage_addProperty(REQUEST['prop'], REQUEST['propval'], 'string')
return REQUEST.RESPONSE.redirect(REQUEST['BASE2'])

When the property exists, this method updates its value. Otherwise, this method creates the property and adds the new value.

What's an external method? It's a piece of pure Python code, which you place in the extensions subdirectory of your Zope installation, and bind into Zope by way of the management interface. Why use an external method? As it turns out, you don't have to in this case. You can do the same things in DTML, using <dtml-call> to invoke the Zope manage_ functions that add and modify index_html's properties.

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