Hidden Demo

Demo of <input type="hidden" ...> for maintaining a conversation

Here it is in action:

http://bert.stuy.edu/pbrooks/spring2016/materials/intro-2/hidden_login.html

Here is the hidden_login.html file:

<html>
<head>
<title>Hidden-Login</title>
</head>
<body>
<form action="hidden_demo.py" method="get">
Username: <input name="username" type="text" /><br />
Password: <input name="password" type="password" /><br />
<input name="submit_login" type="submit" value="Login" /><br />
</form>
</body>
</html>

Here is the hidden_gender.html file:

<html>
<head>
<meta content="text/html; charset=utf-8" http-equiv="Content-Type" />
<title>Hidden Gender</title>
</head>
<body>
All right, ???. Now answer this:<br>
<form action="hidden_demo.py" method="get">
Gender: <input name="gender" type="radio" checked="checked" value="female" />
female&nbsp;&nbsp; <input name="gender" type="radio" value="male" /> male<br />
<input type="hidden" name="hidden_username" value="???" />
<input name="submit_gender" type="submit" value="submit" /></form>
</body>
</html>

Here is the hidden_demo.py program:

#! /usr/bin/python
#! /usr/bin/python

HTML_top='Content-type: text/html\n\n'

Bad_login=HTML_top+'''userame or password problem.

Press the back button to try again.'''

Gender_result=HTML_top+'Thank you, ?? ???'

import cgi, cgitb
cgitb.enable()

def main():
    form=cgi.FieldStorage()
    # are we getting this from the login screen?
    if 'submit_login' in form:
        username=form.getvalue('username').strip()
        password=form.getvalue('password').strip()
        # check for validity
        if username=='' or password=='':
            print Bad_login
            return
        # here, you can check for a valid username and password, but we won't
        # get the html file for the gender question
        html=ReadFile('hidden_gender.html')
        # replace the "???" with the username
        html=html.replace('???',username)
        print HTML_top+html
        return
    # are we getting this from the gender form?
    if 'submit_gender' in form:
        username=form.getvalue('hidden_username')
        gender=form.getvalue('gender')
        html=Gender_result
        #add in the username
        html=html.replace('???',username)
        if gender=='male':
            html=html.replace('??','Mr.')
        else:
            html=html.replace('??','Ms.')
        print html
        return
    print HTML_top+'''debugging'''
    return

def ReadFile(filename):
    try:
        f=open(filename,'rU')
        s=f.read()
        f.close()
    except:
        s=''
    return s


main()