Parsing HTML Forms
==================
Sometimes in functional tests, information from a generated form must
be extracted in order to re-submit it as part of a subsequent request.
The `zope.testing.formparser` module can be used for this purpose.
The scanner is implemented using the `FormParser` class. The
constructor arguments are the page data containing the form and
(optionally) the URL from which the page was retrieved:
>>> import zope.testing.formparser
>>> page_text = '''\
...
...
...
... Just for fun, a second form, after specifying a base:
...
...
...
... '''
>>> parser = zope.testing.formparser.FormParser(page_text)
>>> forms = parser.parse()
>>> len(forms)
2
>>> forms.form1 is forms[0]
True
>>> forms.form1 is forms[1]
False
More often, the `parse()` convenience function is all that's needed:
>>> forms = zope.testing.formparser.parse(
... page_text, "http://cgi.example.com/somewhere/form.html")
>>> len(forms)
2
>>> forms.form1 is forms[0]
True
>>> forms.form1 is forms[1]
False
Once we have the form we're interested in, we can check form
attributes and individual field values:
>>> form = forms.form1
>>> form.enctype
'application/x-www-form-urlencoded'
>>> form.method
'post'
>>> keys = form.keys()
>>> keys.sort()
>>> keys
['do-it-now', 'f1', 'not-really', 'pick-two']
>>> not_really = form["not-really"]
>>> not_really.type
'image'
>>> not_really.value
"Don't."
>>> not_really.readonly
False
>>> not_really.disabled
False
Note that relative URLs are converted to absolute URLs based on the
```` element (if present) or using the base passed in to the
constructor.
>>> form.action
'http://cgi.example.com/cgi-bin/foobar.py'
>>> not_really.src
'http://cgi.example.com/somewhere/dont.png'
>>> forms[1].action
'http://www.example.com/base/sproing/sprung.html'
>>> forms[1]["action"].src
'http://www.example.com/base/else.png'
Fields which are repeated are reported as lists of objects that
represent each instance of the field::
>>> field = forms[1]["multi"]
>>> type(field)
>>> [o.value for o in field]
['', '']
>>> [o.size for o in field]
[2, 3]
The ``