diff options
Diffstat (limited to 'railties/guides/source/layouts_and_rendering.textile')
| -rw-r--r-- | railties/guides/source/layouts_and_rendering.textile | 47 |
1 files changed, 42 insertions, 5 deletions
diff --git a/railties/guides/source/layouts_and_rendering.textile b/railties/guides/source/layouts_and_rendering.textile index df7b9b364c..6c050e27d6 100644 --- a/railties/guides/source/layouts_and_rendering.textile +++ b/railties/guides/source/layouts_and_rendering.textile @@ -671,19 +671,33 @@ There are three tag options available for the +auto_discovery_link_tag+: h5. Linking to JavaScript Files with the +javascript_include_tag+ -The +javascript_include_tag+ helper returns an HTML +script+ tag for each source provided. Rails looks in +public/javascripts+ for these files by default, but you can specify a full path relative to the document root, or a URL, if you prefer. For example, to include +public/javascripts/main.js+: +The +javascript_include_tag+ helper returns an HTML +script+ tag for each source provided. + +If you are using Rails with the "Asset Pipeline":http://guides.rubyonrails.org/asset_pipeline.html enabled, this helper will generate a link to +/assets/javascripts/+ rather than +public/javascripts+ which was used in earlier versions of Rails. This link is then served by the Sprockets gem, which was introduced in Rails 3.1. + +A JavaScript file within a Rails application or Rails engine goes in one of three locations: +app/assets+, +lib/assets+ or +vendor/assets+. These locations are explained in detail in the "Asset Organisation section in the Asset Pipeline Guide":http://guides.rubyonrails.org/asset_pipeline.html#asset-organization + +You can specify a full path relative to the document root, or a URL, if you prefer. For example, to link to a JavaScript file that is inside a directory called +javascripts+ inside of one of +app/assets+, +lib/assets+ or +vendor/assets+, you would do this: <erb> <%= javascript_include_tag "main" %> </erb> -To include +public/javascripts/main.js+ and +public/javascripts/columns.js+: +Rails will then output a +script+ tag such as this: + +<html> +<script src='/assets/main.js' type="text/javascript"></script> +</html> + +The request to this asset is then served by the Sprockets gem. + +To include multiple files such as +app/assets/javascripts/main.js+ and +app/assets/javascripts/columns.js+ at the same time: <erb> <%= javascript_include_tag "main", "columns" %> </erb> -To include +public/javascripts/main.js+ and +public/photos/columns.js+: +To include +app/assets/javascripts/main.js+ and +app/assets/javascripts/photos/columns.js+: <erb> <%= javascript_include_tag "main", "/photos/columns" %> @@ -701,15 +715,38 @@ If the application does not use the asset pipeline, the +:defaults+ option loads <%= javascript_include_tag :defaults %> </erb> -And you can in any case override the expansion in <tt>config/application.rb</tt>: +Outputting +script+ tags such as this: + +<html> +<script src="/javascripts/jquery.js" type="text/javascript"></script> +<script src="/javascripts/jquery_ujs.js" type="text/javascript"></script> +</html> + +These two files for jQuery, +jquery.js+ and +jquery_ujs.js+ must be placed inside +public/javascripts+ if the application doesn't use the asset pipeline. These files can be downloaded from the "jquery-rails repository on GitHub":https://github.com/indirect/jquery-rails/tree/master/vendor/assets/javascripts + +WARNING: If you are using the Asset Pipeline, this tag will render a +script+ tag for an asset called +defaults.js+, which would not exist in your application unless you've explicitly defined it to be. + +And you can in any case override the +:defaults+ expansion in <tt>config/application.rb</tt>: <ruby> config.action_view.javascript_expansions[:defaults] = %w(foo.js bar.js) </ruby> +You can also define new defaults: + +<ruby> +config.action_view.javascript_expansions[:projects] = %w(projects.js tickets.js) +</ruby> + +And use them by referencing them exactly like +:defaults+: + +<erb> +<%= javascript_include_tag :projects %> +</erb> + When using <tt>:defaults</tt>, if an <tt>application.js</tt> file exists in <tt>public/javascripts</tt> it will be included as well at then end. -Also, the +:all+ option loads every JavaScript file in +public/javascripts+: +Also, if the Asset Pipeline is disabled, the +:all+ expansion loads every JavaScript file in +public/javascripts+: <erb> <%= javascript_include_tag :all %> |