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The first part of the script prints a form using the functional interface to the CGI module It provides a simple text entry box, which you then supply to the parse_roman function to produce an integer value If the user has provided some information, you use the param function to access that information To access the data within the username field, for example, you would use
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$name = param('username');
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Note that it doesn t do any validation on that information for you; it only returns the raw data contained in the field You will need to check whether the information in the
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field matches what you were expecting For example, if you want to check for a valid email address, then you ought to at least check that the string contains an @ character:
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if ($name =~ /*\@*/) { # Do something } else { raise_error("Didn't get a valid email address"); }
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You can see what a sample screen looks like in Figure 18-2 Because you are using the functional interface, you have to specify the routines or sets of routines that you want to import The main set is :standard, which is what is used in this script See Appendix B for a list of other supported import sets
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Figure 18-2
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Web-based Roman numeral converter
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18:
Developing for the World Wide Web (WWW)
Let s look a bit more closely at that page builder:
print header, start_html('Roman Numerals Conversion'), h1('Roman Numeral Converter'), start_form, "What's the Roman Numeral number ", textfield('roman'),p, submit, end_form,p,hr,p;
The print function is used, since that s how you report information back to the user The header function produces the HTTP header (see 14) You can supply additional arguments to this function to configure other elements of the header, just as if you were doing it normally You can also supply a single argument that defines the MIME string for the information you are sending back; for example:
print header('text/html'); DEVELOPING APPLICATIONS
If you don t specify a value, the text/html value is used by default The remainder of the lines use functions to introduce HTML tagged text You start with start_html, which starts an HTML document In this case, it takes a single argument the page title This returns the following string:
<HTML><HEAD><TITLE>Roman Numerals Conversion</TITLE> </HEAD><BODY>
This introduces the page title and sets the header and body style The h1 function formats the supplied text in the header level-one style The start_form function initiates an HTML form By default, it assumes you are using the same script this is an HTML/browser feature rather than a Perl CGI feature, and the textfield function inserts a simple text field The argument supplied defines the name of the field as it will be sent to the script when the Submit button is clicked To specify additional fields to the HTML field definition, you pass the function a hash, where each key of the hash should be a hyphen-prefixed field name; so you could rewrite the previous start_form code as
textfield(-name => 'roman')
Other fields might include -size for the size of the text field on screen and -maxlength for the maximum number of characters accepted in a field
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Other possible HTML field types are textarea for a large multiline text box, or popup_menu for a menu field that pops up and provides a list of values when clicked You can also use scrolling_list for a list of values in a scrolling box, and checkboxes and radio buttons with the checkbox_group and radio_group functions Refer to Appendix C for details Returning to the example script, the submit function provides a simple Submit button for sending the request to the server, and finally the end_form function indicates the end of the form within the HTML text The remaining functions, p and hr, insert a paragraph break and horizontal rule, respectively This information is printed out for every invocation of the script The param function is used to check whether any fields were supplied to the script, either by a GET or POST method It returns an array of valid field names supplied For example:
@fields = param();
Since any list in a scalar context returns the number of elements in the list, this is a safe way of detecting whether any information was provided The same function is then used to extract the values from the fields specified In the example, there is only one field, roman, which contains the Roman numeral string entered by the user The parse_roman function then does all the work of parsing the string and translating the Roman numerals into integer values I ll leave it up to the reader to determine how this function works This concludes our brief look into the use of the CGI module for speeding up and improving the overall processing of producing and parsing the information supplied on a form Admittedly, it makes the process significantly easier Just look at the previous examples to see the complications involved in writing a non-CGI-based script Although you can argue that it works, it s not exactly neat But to be fair, the bulk of the complexity centers around the incorporation of the JavaScript application within the HTML document that is sent back to the user s browser
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