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30 If you re familiar with Ruby already, you might know that Procnew is an alternate way to create anonymous blocks of code I prefer lambda, at least in Ruby 19, because of subtle behavior differences Lambda blocks check the arity of the argument list passed to them when call is invoked, and explicitly calling return in a lambda block works correctly
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Listing 1113 Tiles partial code refactored to use lambdas 1 2 3 4 5 6 7
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11: All About Helpers
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left = link_to thumbnailcall(item), linkcall(item) right title = link_to titlecall(item), linkcall(item) description = descriptioncall(item)
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Notice that in Listing 1113, the contents of the left and right div elements come from variables containing lambdas On line 2 we make a call to link_to and both of its arguments are dynamic A similar construct on line 5 takes care of generating the title link In both cases, the first lambda should return the output of a call to image_tag and the second should return a URL In all of these lambda usages, the item currently being rendered is passed to the lambdas as a block variable Wilson says
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Things like linkcall(item) could potentially look even sassier as link[item], except that you ll shoot your eye out doing it (Proc#[] is an alias for Proc#call)
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The New Tiled Helper Method If you now direct your attention to Listing 1114, you ll notice that the tiled method is changed considerably In order to keep my positional argument list down to a manageable size, I ve switched over to taking a hash of options as the last parameter to the tiled method This approach is useful and it mimics the way that almost all helper methods take options in Rails Default values are provided for all parameters, and they are all passed along to the partial via the :locals hash given to render
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Listing 1114 The tiled collection helper method with lambda parameters 1 2 3 4 5 6 module ApplicationHelper def tiled(collection, opts={}) opts[:columns] ||= 3 opts[:thumbnail] ||= lambda do |item| image_tag(itemphotourl(:thumb)) end
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1124 Conclusion
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7 8 9 10 11 12 13 14 15 16 17 18 opts[:title] ||= lambda {|item| itemto_s } opts[:description] ||= lambda {|item| itemdescription } opts[:link] ||= lambda {|item| item } render "shared/tiled_table", :collection => collection, :columns => opts[:columns], :link => opts[:link], :thumbnail => opts[:thumbnail], :title => opts[:title], :description => opts[:description] end end
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Finally, to wrap up this example, here s a snippet showing how to invoke our new
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tiled helper method from a template, overriding the default behavior for links:
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tiled(cities, :link => lambda {|city| showcase_city_path(city)})
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The showcase_city_path method is available to the lambda block, since it is a closure, meaning that it inherits the execution context in which it is created
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1124 Conclusion
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This very long chapter served as a thorough reference of helper methods, both those provided by Rails and ideas for ones that you will write yourself Effective use of helper methods leads to more elegant and maintainable view templates At this point, you should also have a good overview about how I18n support in Ruby on Rails works and are ready to start translating your project Before we fully conclude our coverage of Action Pack, (the name used to refer to Action Controller and Action View together), we ll jump into the world of Ajax and JavaScript Arguably, one of the main reasons for Rails s continued popularity is its support for those two crucial technologies of Web 20 This chapter is published under the Creative Commons Attribution-ShareAlike 30 license, http://creativecommonsorg/licenses/b-sa/30
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Helpers
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C HAPTER 12
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Ajax on Rails
Ajax isn t a technology It s really several technologies, each flourishing in its own right, coming together in powerful new ways Jesse J Garrett, who coined the term
Ajax is an acronym that stands for Asynchronous JavaScript and XML It encompasses techniques that allow us to liven up web pages with behaviors that happen outside the normal HTTP request life cycle (without a page refresh) Some example use-cases for Ajax techniques are
Type ahead input suggestion, as in Google search Sending form data asynchronously Seamless navigation of web-presented maps, as in Google Maps Dynamically updated lists and tables, as in Gmail and other web-based email services Web-based spreadsheets Forms that allow in-place editing Live preview of formatted writing alongside a text input