capture(*args) public

The capture method extracts part of a template as a String object. You can then use this object anywhere in your templates, layout, or helpers.

The capture method can be used in ERB templates…

<% @greeting = capture do %>
  Welcome to my shiny new web page!  The date and time is
  <%= Time.now %>
<% end %>

…and Builder (RXML) templates.

@timestamp = capture do
  "The current timestamp is #{Time.now}."
end

You can then use that variable anywhere else. For example:

<html>
<head><title><%= @greeting %></title></head>
<body>
<b><%= @greeting %></b>
</body>
</html>
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February 22, 2011
7 thanks

Passing arguments to block

To pass arguments to block being captured, just list them as capture method params. I.e.

def export(exportable, export_klass, options={}, &block)
  result = ""
  #...
  if block_given?
    result += capture(my_custom_var_i_want_to_pass_to_block, &block)
  end
  result
end

Then simply…

 <%= export(@a, @b) do |my_custom_var| %>
  <% if my_custom_var.nil? %>
    My custom var is nil!!!
  <% end %>
<% end %>
September 16, 2012
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