21 lines
591 B
Ruby
21 lines
591 B
Ruby
# frozen_string_literal: true
|
|
|
|
# Generated HTML is transformed back to GFM by app/assets/javascripts/behaviors/markdown/nodes/image.js
|
|
module Banzai
|
|
module Filter
|
|
# HTML filter that moves the value of image `src` attributes to `data-src`
|
|
# so they can be lazy loaded.
|
|
class ImageLazyLoadFilter < HTML::Pipeline::Filter
|
|
def call
|
|
doc.xpath('descendant-or-self::img').each do |img|
|
|
img.add_class('lazy')
|
|
img['data-src'] = img['src']
|
|
img['src'] = LazyImageTagHelper.placeholder_image
|
|
end
|
|
|
|
doc
|
|
end
|
|
end
|
|
end
|
|
end
|