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create personal web site Space and ampersand are also special characters. To handle this, CGI provides the routines CGI.escape and CGI.unescape: require 'cgi' puts CGI.escape( "Nicholas Payton/Trumpet & Flugel Horn" ) produces: Nicholas+Payton%2FTrumpet+%26+Flugel+Horn Similarly, you may want to escape HTML special characters: require 'cgi' puts CGI.
create personal web site escapeHTML( '<a href="/mp3">Click Here</a>' ) produces: <a href="/mp3">Click Here</a> To get really fancy, you can decide to escape only certain elements within a string: require 'cgi' puts CGI.escapeElement('<hr><a href="/mp3">Click Here</a><br>','A') produces: <hr><a href="/mp3">Click Here</a><br> Here only the ``A'' tag is escaped; other tags are left alone. Each of these methods has an ``un-'' version to restore the original string. Forms Using class CGI gives you access to HTML query parameters in two ways. Suppose we are given a URL of /cgi-bin/lookup?player=Miles%20Davis&year=1958.
create personal web site You can access the parameters ``player'' and ``year'' using CGI#[] directly: require 'cgi' cgi = CGI.new cgi['player'] » ["Miles Davis"] cgi['year'] » ["1958"] Or, you can retrieve all parameters as a Hash: require 'cgi' cgi = CGI.new h = cgi.params h['player'] » ["Miles Davis"] Creating Forms and HTML CGI contains a huge number of methods used to create HTML---one method per tag. In order to enable these methods, you must create a CGI object by calling CGI.
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