I mentioned Google's Chart API last week. An obvious use for that is to show the results of surveys. The survey itself is meaningless, and doesn't prevent you from voting multiple times. It's only meant to show how easy it is to produce the graphs or charts, so feel free to click on that link and vote as much as you want.
I've included a simplified version of the code here with comments.
The code uses a data file that looks like this initially:
0 0,0,0,0,0 Network|Mail|Users|Printing|Other
The first line will be the total number of votes, and the rest will be our data for the individual voting items. I'm showing some simplified code here (it just takes out extraneous html):
#!/usr/bin/perl use CGI qw(:standard); $CGI::POST_MAX=1024 ; # max 1K posts $CGI::DISABLE_UPLOADS = 1; # no uploads $FORM_TITLE="Survey"; $SURVEY="newsurvey.pl"; # # locking necessary open(LOCKF, ">/data/survey_lock"); flock LOCKF,2; # # this is the form data $passed=param('group'); # open(I,"/data/survey/$SURVEY"); $votes=<I>; $values=<I>; $bars=<I>; close I; chomp $votes; chomp $bars; chomp $values; # @bars=split /\|/,$bars; $values=~s/ //g; @values=split /,/,$values; # ok, ready to check voting $votes++; for ($x=0;$x < 5;$x++) { $values[$x]++ if ($passed eq $bars[$x]); } $values[4]++ if (not $passed ); # # and write them back out $values=join ',',@values; open(I,">/data/survey/$SURVEY"); print I "$votes\n$values\n$bars\n"; close I; close LOCKF; flock LOCKF,8; # # now ready to display $bars=~s/ /\%20/g; $gvalues=""; # # make votes into percentages for ($x=0;$x < 4;$x++) { my $t=sprintf("%2.2f,",$values[$x]*100/$votes); $gvalues.=$t; } $t=sprintf("%2.2f",$values[4]*100/$votes); $gvalues.=$t; # print header, <<EOF; <html><head><title>$FORM_TITLE</title> </head> <body> <h2>$FORM_TITLE</h2> <hr> <form action="/cgi-bin/$SURVEY" method=POST> <table> <tr><td> What's your responsibility?<br> EOF foreach(@bars) { print <<EOF; <br /><input name=group type=radio value="$_">$_ EOF } print <<EOF; <br /><br /><input type=submit name=posting> </form> </td><td> <table class="open"><tr><th colspan="2">$votes votes</th></tr></p> EOF for ($x=0;$x < 5;$x++) { print "<tr><td>$bars[$x]</td><td>$values[$x]</td></tr>"; } print <<EOF; </table> </td><td> <img src="https://chart.apis.google.com/chart?cht=bvs&chbh=40,20& chd=t:$gvalues&chs=540x100&chl=$bars" alt="Chart of browser usage" /> </td></tr></table> </body></html> EOF
Pretty simple, isn't it?
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More Articles by Anthony Lawrence © 2012-07-16 Anthony Lawrence
I was taught that the human brain was the crowning glory of evolution so far, but I think it’s a very poor scheme for survival (Kurt Vonnegut).
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Surveys with Google Graphs Copyright © December 2007 Tony Lawrence
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