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Update rollup and rollup plugins & create rollup.config.js and use ro…
…llup CLI & generate lozad.es.js & delete build.js (#121)
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/*! lozad.js - v1.6.0 - 2018-08-06 | ||
* https://github.com/ApoorvSaxena/lozad.js | ||
* Copyright (c) 2018 Apoorv Saxena; Licensed MIT */ | ||
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/** | ||
* Detect IE browser | ||
* @const {boolean} | ||
* @private | ||
*/ | ||
const isIE = typeof document !== 'undefined' && document.documentMode; | ||
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const defaultConfig = { | ||
rootMargin: '0px', | ||
threshold: 0, | ||
load(element) { | ||
if (element.nodeName.toLowerCase() === 'picture') { | ||
const img = document.createElement('img'); | ||
if (isIE && element.getAttribute('data-iesrc')) { | ||
img.src = element.getAttribute('data-iesrc'); | ||
} | ||
if (element.getAttribute('data-alt')) { | ||
img.alt = element.getAttribute('data-alt'); | ||
} | ||
element.appendChild(img); | ||
} | ||
if (element.getAttribute('data-src')) { | ||
element.src = element.getAttribute('data-src'); | ||
} | ||
if (element.getAttribute('data-srcset')) { | ||
element.srcset = element.getAttribute('data-srcset'); | ||
} | ||
if (element.getAttribute('data-background-image')) { | ||
element.style.backgroundImage = `url('${element.getAttribute('data-background-image')}')`; | ||
} | ||
if (element.getAttribute('data-toggle-class')) { | ||
element.classList.toggle(element.getAttribute('data-toggle-class')); | ||
} | ||
}, | ||
loaded() {} | ||
}; | ||
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function markAsLoaded(element) { | ||
element.setAttribute('data-loaded', true); | ||
} | ||
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const isLoaded = element => element.getAttribute('data-loaded') === 'true'; | ||
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const onIntersection = (load, loaded) => (entries, observer) => { | ||
entries.forEach(entry => { | ||
if (entry.intersectionRatio > 0) { | ||
observer.unobserve(entry.target); | ||
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if (!isLoaded(entry.target)) { | ||
load(entry.target); | ||
markAsLoaded(entry.target); | ||
loaded(entry.target); | ||
} | ||
} | ||
}); | ||
}; | ||
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const getElements = selector => { | ||
if (selector instanceof Element) { | ||
return [selector] | ||
} | ||
if (selector instanceof NodeList) { | ||
return selector | ||
} | ||
return document.querySelectorAll(selector) | ||
}; | ||
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function lozad (selector = '.lozad', options = {}) { | ||
const {rootMargin, threshold, load, loaded} = {...defaultConfig, ...options}; | ||
let observer; | ||
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if (window.IntersectionObserver) { | ||
observer = new IntersectionObserver(onIntersection(load, loaded), { | ||
rootMargin, | ||
threshold | ||
}); | ||
} | ||
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return { | ||
observe() { | ||
const elements = getElements(selector); | ||
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for (let i = 0; i < elements.length; i++) { | ||
if (isLoaded(elements[i])) { | ||
continue | ||
} | ||
if (observer) { | ||
observer.observe(elements[i]); | ||
continue | ||
} | ||
load(elements[i]); | ||
markAsLoaded(elements[i]); | ||
loaded(elements[i]); | ||
} | ||
}, | ||
triggerLoad(element) { | ||
if (isLoaded(element)) { | ||
return | ||
} | ||
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load(element); | ||
markAsLoaded(element); | ||
loaded(element); | ||
} | ||
} | ||
} | ||
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export default lozad; |
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