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Diffstat (limited to 'railties')
| -rw-r--r-- | railties/guides/source/asset_pipeline.textile | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/railties/guides/source/asset_pipeline.textile b/railties/guides/source/asset_pipeline.textile index 54464cdf4d..69b8d43f55 100644 --- a/railties/guides/source/asset_pipeline.textile +++ b/railties/guides/source/asset_pipeline.textile @@ -174,6 +174,18 @@ The more generic form can also be used but the asset path and class must both be * +asset-url("rails.png", image)+ becomes +url(/assets/rails.png)+ * +asset-path("rails.png", image)+ becomes +"/assets/rails.png"+ +h5. JavaScript and ERB + +If you add an +erb+ extension to a JavaScript asset, making it something such as +application.js.erb+, then you can use the +asset_path+ helper in your JavaScript code: + +<plain> +$('#logo').attr({ + src: "<%= asset_path('logo.png') %>" +}); +</plain> + +This writes the path to the particular asset being referenced. + h4. Manifest Files and Directives Sprockets uses manifest files to determine which assets to include and serve. These manifest files contain _directives_ -- instructions that tell Sprockets which files to require in order to build a single CSS or JavaScript file. With these directives, Sprockets loads the files specified, processes them if necessary, concatenates them into one single file and then compresses them (if +Rails.application.config.assets.compress+ is set to +true+). By serving one file rather than many, the load time of pages are greatly reduced as there are fewer requests to make. |