7.8 Form Widget Methods


7.8 Form Widget Methods

The here document, though handy, may not be the best way to build every HTML page. CGI.pm provides several other methods to create widgets, including:

  • start_form() ” start tag for the form

  • textfield() ” tag for a text widget

  • textarea() ” tag for a text area

  • radio_group() ” tags for a radio button group

  • checkbox() ” tag for a check box

  • popup_menu() ” tag for a pop-up menu

  • scrolling_list() ” tags for a scrolling list box

  • submit() ” tag for a submit button

  • reset() ” tag for a reset button

  • end_form() </FORM>

The following example, /var/www/cgi-bin/widgets3.cgi , uses these methods and produces the same form shown in Figure 7.12. You can find its code at http://localhost/cgi/widgets3.cgi or www.opensourcewebbook.com/cgi/widgets3.cgi. To prove it works, load one of the URLs.

The if part is just like widgets2.cgi , so we won't show it here. The else part is of interest here:

 }else{     # if we are here, then we need to build the form     # so print the header, then the html     print         header(),         start_html(-title   => An Example of Form Widgets,                    -bgcolor => #ffffff),         h1(An Example of Form Widgets),         start_form(),         Programming language: ,         textfield(-name => language, -value => Perl),         br(),         Comments:,         br(),         textarea(-name => comments,                  -cols => 20,                  -rows => 5),         br(),         Rate the coolness: ,         radio_group(-name    => coolness,                     -values  => [cool, very cool, ice cold],                     -default => ice cold),         br(),         I will learn more about Perl and CGI: ,         checkbox(-name    => learnmore,                  -value   => yes,                  -label   =>  Yes,                  -checked => 1),         br(),         I will use this operating system: ,         popup_menu(-name   => operating_system,                    -values => [Linux, Solaris, HPUX],                    -size   => 1),         br(),         My favorite animal(s): ,         scrolling_list(-name     => animal,                        -values   => [Penguin, Camel, Llama,                                      Panther],                        -size     => 3,                        -multiple => 1),         br(),         br(),         submit(-value => Submit Form),          ,         reset(-value => Reset Form),         end_form();  } 

Here the various CGI.pm functions are used to produce the HTML for this form.

N

Notice that action="/cgi-bin/widgets.cgi" was not set in the start_form() method. CGI.pm is smart enough to set the action to the name of the CGI program it is used within.


CGI.pm offers these other methods to create form widgets:

  • start_multipart_form() ” beginning tag for a multipart form

  • defaults() ” tag for a defaults button

  • password_field() ” tag for a password field (a text field containing data that won't be displayed ”it will be starred-out)

  • checkbox_group() ” tags for a group of check boxes

  • filefield() ” tag for a file upload widget (must use start_multipart_form() )

  • hidden() ” tag for a hidden field

  • image_button() ” tag for an image button

  • button() ” tag for a generic button

See the CGI.pm documents for further information.



Open Source Development with Lamp
Open Source Development with LAMP: Using Linux, Apache, MySQL, Perl, and PHP
ISBN: 020177061X
EAN: 2147483647
Year: 2002
Pages: 136

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