@tjoskar/react-lazyload-img

<!doctype html> <html lang="en"> <head> <title>Code coverage report for lazyload.ts</title> <meta charset="utf-8" /> <link rel="stylesheet" href="prettify.css" /> <link rel="stylesheet" href="base.css" /> <meta name="viewport" content="width=device-width, initial-scale=1"> <style type='text/css'> .coverage-summary .sorter { background-image: url(sort-arrow-sprite.png); } </style> </head> <body> <div class='wrapper'> <div class='pad1'> <h1> <a href="index.html">All files</a> lazyload.ts </h1> <div class='clearfix'> <div class='fl pad1y space-right2'> 23.21% Statements 13/56 </div> <div class='fl pad1y space-right2'> 10.53% Branches 2/19 </div> <div class='fl pad1y space-right2'> 5.56% Functions 1/18 </div> <div class='fl pad1y space-right2'> 23.53% Lines 12/51 </div> </div> Press n or j to go to the next uncovered block, b, p or k for the previous block. </div> <div class='status-line low'></div> <pre><table class="coverage"> <tr><td class="line-count quiet"><a name='L1'></a><a 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    1x               1x                 1x           1x                 1x                                              </td><td class="text"><pre class="prettyprint lang-js">import { ObserverOptions, IntersectionObserverEntryType, Props } from './types'   const defaultObserverOptions: ObserverOptions = { root: undefined, rootMargin: undefined, threshold: undefined }   const observerKeys: ObserverOptions[] = [] const observers = new WeakMap<ObserverOptions, IntersectionObserver>() const images = new WeakMap<Element, { observer: IntersectionObserver; options: Props }>()   export const call = fn => fn && fn() export const isNull = <T>(obj: T | null): obj is null => obj === null const createIntersectionObserver = (options: ObserverOptions) => new IntersectionObserver(loadingCallback, options)   function loadingCallback(entrys: IntersectionObserverEntryType[]) { entrys.filter(entry => entry.isIntersecting).forEach(entry => { const target = entry.target as HTMLImageElement | HTMLDivElement const metaData = images.get(target) if (!metaData) { console.warn('Could not find meta data for image') return } metaData.observer.unobserve(target) loadImage(metaData.options.image) .catch(() => { if (metaData.options.errorImage) { return loadImage(metaData.options.errorImage) } return Promise.resolve(metaData.options.defaultImage) }) .catch(() => metaData.options.defaultImage) .then((imagePath: string) => { setImage(target as HTMLImageElement, imagePath) addCssClassName(target, 'lazy-loaded') call(metaData.options.onLoaded) }) }) }   export function setImage(element: HTMLImageElement | HTMLDivElement, imagePath: string) { if (isImageElement(element)) { element.src = imagePath } else { element.style.backgroundImage = `url('${imagePath}')` } }   export function loadImage(imagePath: string): Promise<string> { return new Promise((resolve, reject) => { const img = new Image() img.src = imagePath img.onload = () => resolve(imagePath) img.onerror = err => reject(err) }) }   export function isImageElement( element: HTMLImageElement | HTMLDivElement ): element is HTMLImageElement { return element.nodeName.toLowerCase() === 'img' }   export function addCssClassName( element: HTMLImageElement | HTMLDivElement, cssClassName: string ) { if (!element.className.includes(cssClassName)) { element.className += ` ${cssClassName}` } }   export function registerImageToLazyLoad(element: Element, metadata: Props) { const options = metadata.options || defaultObserverOptions let observerKey = observerKeys.find( oKey => oKey.root === options.root && oKey.rootMargin === options.rootMargin && oKey.threshold === options.threshold ) if (!observerKey) { observerKey = options observerKeys.push(observerKey) } let observer = observers.get(observerKey) if (!observer) { observer = createIntersectionObserver(observerKey) observers.set(observerKey, observer) } images.set(element, { observer, options: metadata }) observer.observe(element) }  </pre></td></tr> </table></pre> <div class='push'></div> </div> <div class='footer quiet pad2 space-top1 center small'> Code coverage generated by <a href="https://istanbul.js.org/" target="_blank">istanbul</a> at Tue Sep 24 2019 16:07:23 GMT+0200 (Central European Summer Time) </div> </div> <script src="prettify.js"></script> <script> window.onload = function () { if (typeof prettyPrint === 'function') { prettyPrint(); } }; </script> <script src="sorter.js"></script> <script src="block-navigation.js"></script> </body> </html>