cgi form validation problems

googleboy mynews44 at yahoo.com
Sun Aug 14 22:22:02 CEST 2005


Hi.

I am writing up my own web form. I'm a bit of a newb, and read up many
different how-tos and examples and documentaion.  I finally had it
working just great until I decided that I wanted to add some extra
logic because there's one form that submits a particular type of
information.  a little extra validation, and the creation of a list of
the values to be mailed in to the site manager.

The code below is where I am going wrong (edited for brevity):


form=cgi.FieldStorage()

rev_fields = { "param1":None, "param3":None, "param6":None,
"param5":None, "param8":None, "param9":None, "param10":None,
"param11":None }


# Everything worked until I added the following if statement:

if form.has_key("param8"):   #  Only one form has this
    param8 = form.getvalue("param8")
    if param8 == 0: # 0 is the default value
        print "Content-type: text/html"
        debug("You must give the item a rating")
    for field in form.keys():
        value = form[field].value
        if rev_fields.has_key(field):
            rev_fields[field] = value
    for key in rev_fields:
        if rev_fields[key] == None:
            print "Content-type: text/html"
            debug("All fields must be filled in. Please check your %s
submission." % key)
        else:
            #feedback = ("%s, %s, %s, %s, %s, %s, %s, %s" %
(form["param1"].value, form["param3"].value, form["param6"].
value, form["param5"].value, form["param8"].value,
form["param9"].value, form["param10"].value, form["param11"].value)
            #feedback = ("%s, %s, %s, %s, %s, %s, %s, %s" %
(form.getvalue("param1"), form.getvalue("param3"), form.getvalue(
"param6"), form.getvalue("param5"), form.getvalue("param8"),
form.getvalue("param9"), form.getvalue("param10"),
form.getvalue("param11"))
            feedback = ("%s, %s, %s, %s, %s, %s" %
(rev_fields["param1"], rev_fields["param3"], rev_fields["param6"],
rev_fields["param5"], rev_fields["param8"], rev_fields["param9"],
rev_fields["param10"], rev_fields["param11"])


#feedback = form[ "score" ].value

msg = ("From: %s\r\nTo: %s\r\nSubject: %s\r\n\r\n Feedback: %s\r\n\r\n"
%
    (rev_fields["param2"], rev_fields["param7"], rev_fields["param3"],
rev_fields["param6"]))


If I comment out the 'else:' logic, it works great.  But then I don't
get a list called feedback containing all teh bits I want,  The error I
get is really strange, too:

[Mon Aug 15 05:54:58 2005] [error] [client 60.224.106.116] Premature
end of script headers: /var/www/users/senta/html/gobooks/cgi/form.py
  File "/var/www/users/senta/html/gobooks/cgi/form.py", line 99
    msg = ("From: %s\r\nTo: %s\r\nSubject: %s\r\n\r\n Feedback:
%s\r\n\r\n" %
      ^
SyntaxError: invalid syntax

Just a simple assignation....  I did think it might have been an
indentation error, but I changed that around and got a message telling
me about an indentation problem, which this doesn't do.

I have tried several different ways to assign the values, as you can
see by the commented out lines.  Tried getting the values directly from
teh form, and also from the validated rev_fields dictionary.  I'd be
extremely grateful to anyone who helps me through this.

TIA

Googleboy




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