6.37. Ruby CGI method

发布时间 ：2023-11-01 23:00:07 UTC      

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).

6.37.1. 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.

6.37.2. 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} } } }

6.37.3. 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

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