Ruby CGI method

The following is a list of methods for the CGI class:

Serial number	Method description
1	`CGI::new([ level="query"])` Create a CGI object. Query can be the following value: query: no HTML generated output Html3: HTML3.2 Html4: HTML4.0 Strict Html4Tr: HTML4.0 Transitional Html4Fr: HTML4.0 Frameset
2	`CGI::escape( str)` Escape strings using URL encoding
3	`CGI::unescape( str)` Decodes a string encoded through escape ().
4	`CGI::escapeHTML( str)` Encodes HTML special characters, including: & < >.
5	`CGI::unescapeHTML( str)` Decode HTML special characters, including: & < >.
6	`CGI::escapeElement( str[, element...])` Encodes HTML special characters in the specified HTML element.
7	`CGI::unescapeElement( str, element[, element...])` Decodes HTML special characters in the specified HTML element.
8	`CGI::parse( query)` Parses the query string and returns the key = “valuepair containing the hash.
9	`CGI::pretty( string[, leader=" "])` Returns a neat HTML format. If leader is specified, it is written to the beginning of each line. The default value for leader is two spaces.
10	`CGI::rfc1123_date( time)` Format the time according to RFC-1123 (for example, Tue, 2 Jun 2008 00:00:00 GMT).

CGI instantiation method

In the following example, we will CGI::new is assigned to the c variable, and the list of methods is as follows:

Serial number	Method description
1	`c[ name]` Returns an array containing the value of the corresponding field named name.
2	`c.checkbox( name[, value[, check=false]])` `c.checkbox( options)` Returns the HTML string used to define the checkbox field. The attribute of the tag can be passed as a hash function as an argument.
3	`c.checkbox_group( name, value...)` `c.checkbox_group( options)` > thereturned HTML string is used to define checkbox groups. The attribute of the tag can be passed as a hash function as an argument.
4	`c.file_field( name[, size=20[, max]])` `c.file_field( options)` Returns the HTML string that defines the file field.
5	`c.form([ method="post"[, url]]) { ...}` `c.form( options)` Returns the HTML string that defines the form form. If a code block is specified, itis output as the content of the form. The attribute of the tag can be passed as a hash function as an argument.
6	`c.cookies` Returns the CGI::Cookie object containing the key-value pairs in cookie.
7	`c.header([ header])` Returns the information of the CGI header. If the header parameter is a hash, its key-value pair is used to create header information.
8	`c.hidden( name[, value])` `c.hidden( options)` Returns a HTML string that defines a hidden field. The attribute of the tag can be passed as a hash function as an argument.
9	`c.image_button( url[, name[, alt]])` `c.image_button( options)` Returns the HTML string that defines an image button. The attribute of the tag can be passed as a hash function as an argument.
10	`c.keys` Returns an array containing the field names of the form.
11	`c.key?( name)` `c.has_key?( name)` `c.include?( name)` Returns true if the form contains the specified field name.
12	`c.multipart_form([ url[, encode]]) { ...}` `c.multipart_form( options) { ...}` Returns the HTML string that defines a multimedia form (multipart). The attribute of the tag can be passed as a hash function as anargument.
13	`c.out([ header]) { ...}` Generate HTML and output. Use the string generated by the body of the page created by the output of the block.
14	`c.params` Returns a hash value containing the name and value of the form field.
15	`c.params= hash` Set to use field names and values.
16	`c.password_field( name[, value[, size=40[, max]]])` `c.password_field(options)` Returns a HTML string that defines a password field. The attribute of the tag can be passed as a hash function as an argument.
17	`c.popup_menu( name, value...)` `c.popup_menu( options)` `c.scrolling_list( name, value...)` `c.scrolling_list( options)` Returns the HTML string that defines a pop-up menu. The attribute of the tagcan be passed as a hash function as an argument.
18	`c.radio_button( name[, value[, checked=false]])` `c.radio_button( options)` Returns a HTML string that defines a radio field. The attribute of the tag can be passed as a hash function as an argument.
19	`c.radio_group( name, value...)` `c.radio_group( options)` Returns a HTML string that defines a group of radio buttons. The attribute of the tag can be passed as a hash function as an argument.
20	`c.reset( name[, value])` `c.reset( options)` Returns the HTML string that defines a reset button. The attribute of the tag can be passed as a hash function as a parameter
21	`c.text_field( name[, value[, size=40[, max]]])` `c.text_field( options)` Returns a HTML string that defines a text field. The attribute ofthe tag can be passed as a hash function as an argument.
22	`c.textarea( name[, cols=70[, rows=10]]) { ...}` `c.textarea( options) { ...}` Returns a HTML string that defines a textarea field. If a block is specified, the string output by the code block will be used as the content of the textarea. The attribute of the tag can be passed as a hash function as an argument.

HTML generation method

You can use the corresponding HTML tag signature in the CGI instance to create the HTML tag, as shown below:

Example

#!/usr/bin/rubyrequire"cgi"cgi=CGI.new("html4")cgi.out{cgi.html{cgi.head{"\\n"+cgi.title{"This
Is a Test"} } +cgi.body{"\\n"+cgi.form{"\\n"+cgi.hr+cgi.h1{"A Form:"}
+"\\n"+cgi.textarea("get_text")+"\\n"+cgi.br+cgi.submit} } } }

CGI object Properties

You can use the following properties in the CGI instance:

Attribute	Return value
Accept	Acceptable MIME types
accept_charset	Acceptable character set
accept_encoding	Acceptable coding
accept_language	Acceptable language
auth_type	Acceptable type
raw_cookie	Cookie data (original string)
content_length	Content length
content_type	Content type
From	Client e-mail address
gateway_interface	CGI version
path_info	Path
path_translated	Converted path
Query_string	Query string
referer	Visit the web site before
remote_addr	Client host address (IP)
remote_host	Client hostname
remote_ident	Client name
remote_user	Authenticated user
request_method	Request method (GET, POST, etc.)
script_name	Parameter name
server_name	Server name
server_port	Server port
server_protocol	Server protocol
server_software	Server software
user_agent	User agent

Ruby CGI method

Ruby CGI method

CGI instantiation method

HTML generation method

Example

CGI object Properties

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