To write a CGI script:
The most basic ruby CGI script looks like this:
#!/usr/bin/ruby puts "http/1.0 OK" puts "content-type:text/html\n\n" puts "
If you call this script test.cgi upload to a unix/linux web hosting service provider and have the appropriate permissions, you can use it as a CGI script.
For example, if you have a website hosted by a Linux web hosting provider, such as: Http://www.yiibai.com/test.cgi's home directory, and give it permission to execute, then access the http://www.yiibai.com/test.cgi Should return an HTML page display: This is a test.
Here when test.cgi requests from a Web browser, the Web server looks to execute it using the Ruby interpreter. The Ruby Script returns a basic HTTP header, and then returns a basic HTML document.
Use CGI.RB:
Ruby has a special called CGI library that makes more complex interactions than the previous CGI scripts.
Let's create a basic CGI using CGI script:
#!/usr/bin/ruby require ' cgi ' cgi = cgi.new puts Cgi.header puts "
Here, you create a CGI object and use it to print the header row.
Form processing:
There are two ways to access HTML query parameters using the CGI class. Suppose we give a/cgi-bin/test.cgi? Firstname=zara&lastname=ali.
You can access the parameters FirstName and LastName use cgi#[] as follows:
#!/usr/bin/ruby require ' cgi ' cgi = cgi.new cgi[' FirstName '] # => ["Zara"] cgi[' LastName '] # => [ "Ali"]
There is another way to access these form variables. This code gives the hash value of all the items and values:
#!/usr/bin/ruby
require ' cgi '
cgi = cgi.new
h = cgi.params # => {"FirstName" =>["Zara"], "LastName" = >["Ali"]}
h[' FirstName '] # => ["Zara"]
h[' LastName '] # => ["Ali"]
Here's the code to retrieve all the keys:
#!/usr/bin/ruby require ' cgi ' cgi = cgi.new cgi.keys # => ["FirstName", "LastName"]
If the form contains more than one field with the same name, the corresponding value is returned to the script as an array. [] Accessor returns these are only the first.
In this example, suppose there are three fields in the form named "name", we have entered three names "Zara", "Huma" and "Nuha":
#!/usr/bin/ruby
require ' cgi '
cgi = cgi.new
cgi[' name '] # => "Zara"
cgi.params[' name '] # => ["Zara", "Huma", "Nuha"]
Cgi.keys # => ["name"]
cgi.params # => {"name" =>["Zara", "Huma", "Nuha"]}
Note: Ruby will automatically handle the Get and post methods. There are no separate ways to deal with these two different methods.
A related, but basic form, that can send the correct data, will have HTML code, just like this:
Create forms and HTML:
CGI contains a number of methods for creating HTML. You will find one of the methods for each label. To make these methods, you must create a CGI object by calling Cgi.new.
To make tags easier to nest, these methods take their content as a block of code. The code block returns a string, which will be used as the content of the label. For example:
#!/usr/bin/ruby
require "cgi"
cgi = cgi.new ("Html4")
cgi.out{
cgi.html{
"\ 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
}
}}
Note: The method parameters of the CGI class can be accepted, which will set up the form submission used on the HTTP method (Get,post, etc.). By default, a post is used in this example.
This will produce the following results:
content-type:text/html content-length:302 <! DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 final//en" > <HTML> <HEAD> <title>this is a test</title> </HEAD> <BODY> <form method= "POST" enctype= "application/ x-www-form-urlencoded "> <HR>
Reference string:
When dealing with URLs and HTML code, you must carefully reference some characters. For example, a slash character (/) has a special meaning in the URL, so it must be escaped if it is not part of the path name.
For example, the/query URL portion will be translated into a string%2f/and must be translated when used. Space and special characters with symbols. To deal with this problem, CGI provides: Cgi.escape and cgi.unescape in routine procedures.
#!/usr/bin/ruby require ' CGI ' puts Cgi.escape (Zara ali/a Sweet & Sour Girl ")
This will produce the following results:
ZARA+ALI%2FA sweet+%26+sour+girl ")
#!/usr/bin/ruby
require ' CGI ' puts
cgi.escapehtml ('
This will produce the following results:
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