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资源说明：Lazy image loading for Rails 3.1+
# jquery-lazy-images jQuery plugin for lazy-loading of images. Why have your users download what they can't see? [](https://travis-ci.org/singlebrook/jquery-lazy-images) ## Installation ### Rails 3.1 or greater (with asset pipeline *enabled*) Add to your Gemfile: `gem 'jquery-lazy-images'`. Run `bundle install`. The jquery.lazy-images files is now added to the asset pipeline and available for you to use. Add `require jquery.lazy-images` to app/assets/javascripts/application.js and app/assets/stylesheets/application.css, following the existing format of those files. ### Rails 3.0 or earlier (or without asset pipeline) You're on your own here. Sorry! ## Usage All images rendered with image_tag will automatically be lazy-loaded. ### Images in email Lazy-loading of images in email *really* doesn't work. We haven't thought of a performant way to automatically make these images eager-loading, so you'll need to change your image_tag's in your email templates to eager_image_tag's. This **dangerous** command may help you with this: ```bash sed -i 's/image_tag/eager_image_tag/g' app/views/*_mailer/* ``` ### Precompiling the assets If you precompile your assets, be sure that you have a line like this in your `config/environments/production.rb` (or similar) to avoid getting a 404 on the placeholder image (grey.gif). ```ruby config.assets.precompile += %w(*.png *.jpg *.jpeg *.gif) ``` ## Development To run the specs you must have [PhantomJS](http://phantomjs.org/) [installed](http://phantomjs.org/build.html). If you use [homebrew](http://mxcl.github.com/homebrew/) you can run `brew install phantomjs`. ## Acknowledgements Thanks to Mika Tuupola for creating [jquery.lazyload.js](http://www.appelsiini.net/projects/lazyload)! This gem bundles that library, and he's done most of the hard work for us. ## Contributors * @sbleon - Initial build * @jkonowitch - Initial build * @bobbyw - Poltergeist testing support * @petergoldstein - Rails 4 compatibility and Travis CI integration
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