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https://github.com/yu-i-i/overleaf-cep.git
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bb0df00d7f
[web] Convert pug frontend helpers to typescript GitOrigin-RevId: e74527306ded6bc7db992cd8ceaff34d0d26b1b7
22 lines
658 B
TypeScript
22 lines
658 B
TypeScript
function loadingFailed(imgEl: HTMLImageElement) {
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return imgEl.complete && imgEl.naturalWidth === 0
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}
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document.querySelectorAll('[data-ol-fallback-image]').forEach(element => {
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if (!(element instanceof HTMLImageElement)) {
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// The sprinkle only applies to image elements.
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return
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}
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const imgEl = element as HTMLImageElement
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function showFallback() {
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imgEl.src = imgEl.getAttribute('data-ol-fallback-image')!
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}
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if (loadingFailed(imgEl)) {
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// The image loading failed before the sprinkle ran.
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showFallback()
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} else {
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// The image loading might fail in the future.
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imgEl.addEventListener('error', showFallback)
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}
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})
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