18 lines
464 B
Ruby
18 lines
464 B
Ruby
module Banzai
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module Filter
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# HTML filter that moves the value of image `src` attributes to `data-src`
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# so they can be lazy loaded.
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class ImageLazyLoadFilter < HTML::Pipeline::Filter
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def call
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doc.xpath('descendant-or-self::img').each do |img|
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img['class'] ||= '' << 'lazy'
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img['data-src'] = img['src']
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img['src'] = LazyImageTagHelper.placeholder_image
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end
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doc
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end
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end
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end
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end
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