Understanding promise.race() usage

As you see, the race() will return the promise instance which is firstly resolved or rejected: var p1 = new Promise(function(resolve, reject) { setTimeout(resolve, 500, ‘one’); }); var p2 = new Promise(function(resolve, reject) { setTimeout(resolve, 100, ‘two’); }); Promise.race([p1, p2]).then(function(value) { console.log(value); // “two” // Both resolve, but p2 is faster }); For a scenes … Read more

How do I detect when a web page is loaded?

You would use javascript to do this. If you don’t know how to use javascript, I would recommend reading through some tutorials first. After you have a basic understanding of javascript, you can detect when a page has loaded by using the window.onload event. window.onload = function() { addPageContents(); //example function call. } Edit: If … Read more

update markercluster after removing markers from array

Yes you can. Creating the map Assuming you have created your MarkerClusterer object something like this: var center = new google.maps.LatLng(10, 20); var map = new google.maps.Map(document.getElementById(‘map’), { zoom: 6, center: center, mapTypeId: google.maps.MapTypeId.ROADMAP }); var markerClusterer = new MarkerClusterer(map); Adding markers You can add multiple markers to it something like this: var markers = … Read more

Keydown Simulation in Chrome fires normally but not the correct key

So very very close… You just needed to override the ‘which’ property. Here’s some sample code: document.addEventListener(‘keydown’, e => console.log( ‘altKey : ‘ + e.altKey + ‘\n’ + ‘charCode (Deprecated) : ‘ + e.charCode + ‘\n’ + ‘code : ‘ + e.code + ‘\n’ + ‘ctrlKey : ‘ + e.ctrlKey + ‘\n’ + ‘isComposing : … Read more

Next.js getServerSideProps show loading

Here is an example using hooks. pages/_app.js import Router from “next/router”; export default function App({ Component, pageProps }) { const [loading, setLoading] = React.useState(false); React.useEffect(() => { const start = () => { console.log(“start”); setLoading(true); }; const end = () => { console.log(“finished”); setLoading(false); }; Router.events.on(“routeChangeStart”, start); Router.events.on(“routeChangeComplete”, end); Router.events.on(“routeChangeError”, end); return () => { … Read more

how to create placeholder while loading like facebook

You can make it with some css background linear-gradient: @keyframes placeHolderShimmer{ 0%{ background-position: -468px 0 } 100%{ background-position: 468px 0 } } .linear-background { animation-duration: 1s; animation-fill-mode: forwards; animation-iteration-count: infinite; animation-name: placeHolderShimmer; animation-timing-function: linear; background: #f6f7f8; background: linear-gradient(to right, #eeeeee 8%, #dddddd 18%, #eeeeee 33%); background-size: 1000px 104px; height: 338px; position: relative; overflow: hidden; } … Read more

Format credit card number

Try this: function cc_format(value) { var v = value.replace(/\s+/g, ”).replace(/[^0-9]/gi, ”) var matches = v.match(/\d{4,16}/g); var match = matches && matches[0] || ” var parts = [] for (i=0, len=match.length; i<len; i+=4) { parts.push(match.substring(i, i+4)) } if (parts.length) { return parts.join(‘ ‘) } else { return value } } Note: Check this for detailed information … Read more

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