create a simple yes/no question online

Posted on 2002-04-30
Last Modified: 2010-03-05
I want to have a simple yes/no question on my webpage that is on unix server. Hence i have to use perl only. I just need to store the number of yes and no's. No other information like userid etc are there. Is it possible to store information in a simple txt file? Also are there any permissions that I have to set for the folder where the page and script is hosted?

How do i do this in perl?

Question by:Sankar030999
  • 3

Expert Comment

ID: 6982930
Yes and it's very easy ! :)
teh clasic way to  do this is :

1. Make a html file whith the questions.
2. user submits the form with the choosen answer
3. Perl-CGI script recievies the data, opens the file and updates values;
4. print a result page back to the user or redirect him to an existent page

Yah have to set the rights :  execute (chmode 755) for the script and read/write for the data file (chmode 666)

Accepted Solution

Tsvetomir earned 100 total points
ID: 6983013
here is an example code :

>HTML page to send the yous/no :

<BODY bgcolor="#FFFFFF" text="#000000">
<FORM name="voteform" method="post" action="path/to/ the/script">
  .... please answer:<BR>
  <INPUT type="radio" name="answer" value="1" checked>
  <INPUT type="radio" name="answer" value="0">

> Perl - CGI cript:

# vote.cgi
use strict;
use warnings;
use Fcntl qw(:flock);
use Fcntl;
use CGI qw(:standard);

# Intialize variables:
# the dile with the data:
my $datafile="votes.txt";
# $yes will sotre the number of yes answers:
my $yes=0;
# $yes will sotre the number of "no" answers:
my $no=0;

# get the data from the form (the value of the radio buton: 1-yes 0-no):
$answer = param("answer");

# Open the file otr crate it if it doeasn't exists:
sysopen (FH, $datafile, O_RDWR | O_CREAT) or die "can't open/create the file $datafile :( !\n $!\n";
# Lock it to prevent errors from simultaneous tryes to write in file:
flock FH, LOCK_EX;
# Input line separator will be ";":
# First element is num of "yes" second of "no" answers (ie: "243;55" means 243-Yes, 55-No )    
($yes, $no)=(<FH>, 0, 0); ## 0, 0 are in case it's first time and the values are undefined

# Increment:
if ($answer==1) {
}else {

# Update the results:
seek FH, 0 , 0;
print FH "$yes;$no";
truncate FH, tell(FH);

# release the lock and colse the file
flock FH, LOCK_UN;
close FH;

# print some results/redirect to page
print "Content-type:text/html\n\n";
print <<"(HTML)";
<BODY bgcolor="#FFFFFF" text="#000000">
The results : $yes say "Yes" $no say "No"


# End

Expert Comment

ID: 6983053
Sorry..., better change theese two:

1.)After line 29 - ($yes, $no)=(<FH>, 0, 0);


(removes trailing ";" from the values if it's assigned)

2.)To prevent incrmenting "no" if no answer was selected change :

if ($answer==1) {
}else {

# with:
if ($answer==1) {
}elsif ($answer==0){


Author Comment

ID: 6987255
The solution worked perfectly...I just had to change in a few places.


Featured Post

Announcing the Most Valuable Experts of 2016

MVEs are more concerned with the satisfaction of those they help than with the considerable points they can earn. They are the types of people you feel privileged to call colleagues. Join us in honoring this amazing group of Experts.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Port 80 requests 16 102
Exchange 2010 Transport Rule Regex 28 131
File Find regex problem 4 67
Perl Versus AWK? 7 67
I've just discovered very important differences between Windows an Unix formats in Perl,at least 5.xx.. MOST IMPORTANT: Use Unix file format while saving Your script. otherwise it will have ^M s or smth likely weird in the EOL, Then DO NOT use m…
Checking the Alert Log in AWS RDS Oracle can be a pain through their user interface.  I made a script to download the Alert Log, look for errors, and email me the trace files.  In this article I'll describe what I did and share my script.
Explain concepts important to validation of email addresses with regular expressions. Applies to most languages/tools that uses regular expressions. Consider email address RFCs: Look at HTML5 form input element (with type=email) regex pattern: T…

679 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question