2020-01-21 06:35:58 +00:00
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from copy import deepcopy
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from django.templatetags.static import static
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from lxml import html
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def lazy_load(tree):
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2022-05-14 17:57:27 +00:00
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blank = static("blank.gif")
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for img in tree.xpath(".//img"):
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src = img.get("src", "")
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if src.startswith("data") or "-math" in img.get("class", ""):
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2020-01-21 06:35:58 +00:00
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continue
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2022-05-14 17:57:27 +00:00
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noscript = html.Element("noscript")
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2020-01-21 06:35:58 +00:00
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copy = deepcopy(img)
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2022-05-14 17:57:27 +00:00
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copy.tail = ""
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2020-01-21 06:35:58 +00:00
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noscript.append(copy)
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img.addprevious(noscript)
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2022-05-14 17:57:27 +00:00
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img.set("data-src", src)
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img.set("src", blank)
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img.set("class", img.get("class") + " unveil" if img.get("class") else "unveil")
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