perl

Perl problem: When you don't use Perl every day, it's hard to remember the combination of the for loop syntax and how to deal with the special $_ variable to refer to each element within the body of the loop.

Solution: As I write this today, I still can't remember how to get this for loop and $_ syntax to work, at least not without pulling out a book, or looking it up on the internet. A much better solution is to just use Perl's foreach syntax, and never look back.

Perl array foreach FAQ: How do I loop over every element in a Perl array with a for loop (or foreach loop)?

A friend recently asked how to create a simple array of numbers with Perl, and also how to iterate over that list of numbers in a Perl foreach loop. In this article I'll share with you the code I shared with him.

Here's the source code for a Perl CGI popup menu example. (It's called a "popup menu" in the CGI.pm module, but it renders an HTML SELECT/OPTION form in a browser.)

The Perl code below shows how you can display an HTML form with a popup menu, using the Perl CGI.pm module. The first time this script is called it displays the popup menu (combo box) in a form. After you submit the form, this script displays the item you selected from the combo box.

Here's the source code for this Perl CGI.pm combo box example script:

Here's the source code for a Perl CGI scrolling list example. The CGI.pm module calls this a scrolling list, but it renders an HTML SELECT/OPTION form field with the "multiple" attribute.

The Perl code below shows how you can display an HTML form with a scrolling list field, using the Perl CGI.pm module. The first time this script is called it displays a scrolling list field in a form. After you submit the form, this script displays the item you selected in the scrolling list.

Here's the source code for this Perl CGI.pm scrolling list example script:

Here's the source code for a Perl CGI textfield example (a Perl form example). The Perl code below shows how you can display an HTML form with a textfield using the Perl CGI.pm module.

The first time this script is called it displays a textfield in a form. After you submit the form, this script displays the text that you entered in the textfield.

Here's the source code for this CGI.pm "Perl form" textfield example script: