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Add config.action_view.image_loading

 4 years ago
source link: https://github.com/rails/rails/pull/38452
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jonathanhefner commented on Feb 14 •

edited

Browser native support for lazy loading images is now a part of the official HTML standard. To indicate to the browser that an image should be lazily loaded, add the loading="lazy" attribute to the img tag. Or, in Rails parlance, add the loading: "lazy" option to the image_tag call.

This commit adds Rails.application.config.action_view.image_loading to configure the default value of the image_tag :loading option. Thus by setting config.action_view.image_loading = "lazy", an application can opt in to lazy loading images sitewide, without changing view code.

Currently only Chrome and Edge support loading="lazy" (reference), but Firefox 75 will support it, and Safari will soon.

TODO

  • documentation
  • additional tests for the Railtie code

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