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As you can see, there is nothing special about this sample script, compared to other programs that use the CGI. The handling of input parameters is the same as for any program that uses the CGI module, and nothing special needs to be done, apart from being aware that PNG data is binary, and therefore STDOUT should be prepared with binmode().
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The example from the previous section is a minor one, because there is no interactive input to the program that creates the graphic. More often, there will be the requirement for some user input, and an HTML page as output with the graphic somewhere on it. As an example we will take the program that generates a chart of the Southern Oscillation index and rainfall from section 5.1.7 Mixed charts, on page 72, and fashion that into an interactive Web application that combines a few select boxes and a display of a graph, as shown in figure 6.1. The only user input will be the start and end dates for the graph, which can be selected from 4 pop up menus at the top of the page. The output is the same form, with the pop-ups initialized to the selected values or to some default, if nothing was selected yet. If values have been submitted, then the HTML page will also contain a chart with the SOI and monthly rainfall plotted over the period indicated. The program that provides this functionality is surprisingly simple, mainly thanks to the use of the CGI module. Let s have a look at how it works.
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#!/usr/bin/perl -wT use strict; use CGI qw(:standard); use CGI::Carp qw(fatalsToBrowser); use GD::Graph::mixed; use GD::Graph::Data;
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Include the needed modules
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use vars qw($data $start_date $end_date @months @years); @months = qw(Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec); @years = (1987 .. 1999);
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The expiration time is here to make sure that well behaved browsers and proxies will refresh the image at least once every minute.
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Figure 6.1 A screen shot of the Southern Oscillation Index CGI program in action. The interface allows the user to select a start and end date from a set of drop-down menus and, on submission of the request, the result of the query is shown in a chart.
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We start with the most common standard header for CGI scripts: the -w and -T flag for Perl, the strict pragma, and the CGI and CGI::Carp modules. The CGI::Carp module can help a CGI programmer quite a bit during development by routing any error messages from the program or Perl to the browser. Since the script must be able to create a chart, we include GD::Graph::mixed, and since we want to store our data somewhere, we ll use GD::Graph::Data. After that, we declare some variables that we want to be able to use globally, and which define the valid range of months and years used to populate the popup menus. Next, we ll determine the input parameters, and read the relevant data from the data file:
Only if parameters have if (param()) been submitted { $data = GD::Graph::Data->new(); $start_date = param('start_month').'/'.param('start_year'); $end_date = param('end_month').'/'.param('end_year'); open(IN, '../Charts/SOI.data') or die "Can't read SOI.data:$!"; while(<IN>) { next if /^#/;
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Only read data in the if (/^\Q$start_date/ .. /^\Q$end_date/) wanted range { chomp; my @d = map {$_ eq '' undef : $_} split /\t/; $data->add_point(@d); }
} close(IN); }
The code in this block is executed only if any parameters have been submitted. It reads in the data from the data file, the same way as the program in section 5.1.7 does, but with user-supplied start and end dates instead of hard coded ones. This data is placed into the GD::Graph::Data object only when it falls between the start and end dates specified by the user. While storing the data, empty fields in the data file are mapped to undef values, since GD::Graph requires that non-existing data points be entered that way. Note that in a real-life production script the input validation should probably be more sophisticated. Rather than merely checking for the presence of any parameters, the script should verify that the parameters it needs are present, and whether they have valid values. The following step is taken to determine whether we want to generate an HTML form as output or a chart:
if (path_info() =~ /graph$/) { make_graph(); } else { make_form(); }
For this example we distinguish between the two possible outputs by adding some path information at the end of the script. This is an often overlooked aspect of the CGI standard; the part of the path that comes after the script URL is passed to the program in the environment variable PATH_INFO, which we can access with the path_info() method from the CGI module. Suppose that the script is accessible as http://www.foo.com/weather/SOI.cgi, then the chart will be generated from the URL http://www.foo.com/weather/SOI.cgi/graph. The code simply checks whether the return value of path_info() ends in the string graph. If so, the subroutine make_graph() is executed; if not, make_form() is executed. Now let s see how the real work is done:
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