If I have an .html.erb file that looks like this:
<html>
<head>
<title>Test</title>
</head>
<body>
<%= @name %>
</body>
</html>
How can I generate an HTML file that looks like this?
<html>
<head>
<title>Test</title>
</head>
<body>
John
</body>
</html>
How can I execute the template (passing the name parameter) given that the format is .html.erb and be able to get just an .html file?
#page.html.erb
<html>
<head>
<title>Test</title>
</head>
<body>
<%= @name %>
</body>
</html>
...
require 'erb'
erb_file = 'page.html.erb'
html_file = File.basename(erb_file, '.erb') #=>"page.html"
erb_str = File.read(erb_file)
@name = "John"
renderer = ERB.new(erb_str)
result = renderer.result()
File.open(html_file, 'w') do |f|
f.write(result)
end
...
$ ruby erb_prog.rb
$ cat page.html
<html>
<head>
<title>Test</title>
</head>
<body>
John
</body>
</html>
Of course, to make things more interesting, you could always change the line @name = "John" to:
print "Enter a name: "
@name = gets.chomp
The ruby ERB library operates on strings, so you would have to read the .erb file into a string, create an ERB object, and then output the result into an html file, passing the current binding to the ERB.result method.
It would look something like
my_html_str = ERB.new(@my_erb_string).result(binding)
where @my_erb_string. You could then write the html string into an html file.
You can read more about binding here and about the ERB library here.
@name is defined in the same context that binding is called, it will be accessible in the erb.Here is a sample code:
require 'erb'
template = File.read("template.html.erb")
renderer = ERB.new(template)
class Message
attr_accessor :name
def initialize(name)
@name = name
end
def get_binding
binding()
end
end
message = Message.new 'John'
File.open('result.html', 'w') do |f|
f.write renderer.result message.get_binding
end
The template.html.erb is your .html.erb template file and result.html is the rendered html file.
