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website design website design out{ cgi.html{ "\nCustomer #{sess['CustID']} orders an #{sess['Part']}" } } Embedding Ruby in HTML So far we've looked at using Ruby to create HTML output, but we can turn the problem inside out; we can actually embed Ruby in an HTML document. There are a number of packages that allow you to embed Ruby statements in some other sort of a document, especially in an HTML page. Generically, this is known as ``eRuby.'' Specifically, there are several different implementations of eRuby, including eruby and erb.

website design The remainder of this section will discuss eruby, written by Shugo Maeda. Embedding Ruby in HTML is a very powerful concept---it basically gives us the equivalent of a tool such as ASP, JSP, or PHP, but with the full power of Ruby. Using eruby eruby acts as a filter, plain and simple. Any text within the input file is passed through untouched, with the following exceptions: Expression Description <% ruby code %> The Ruby code between the delimiters is replaced with its output. <%= ruby expression %> The Ruby expression between the delimiters is replaced with its value.

website design <%# ruby code %> The Ruby code between the delimiters is ignored (useful for testing). You invoke eruby as: eruby [ options ] [ document ] If the document is omitted, eruby will read from standard input. The command-line options for eruby are shown in Table 14.1 on page 149. Command-line options for eruby Option Description -d, --debug Sets $DEBUG to true.

website design -K kcode Specifies an alternate coding system (see page 137). -M mode Specifies runtime mode, one of: f filter mode c CGI mode (prints errors as HTML, sets $SAFE=1) n NPH-CGI mode (prints extra HTTP headers, sets $SAFE=1) -n, --noheader Disables CGI header output. -v, --verbose Enables verbose mode. --version Prints version information and exits. Let's look at some simple examples.

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