Created
November 16, 2018 08:26
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Avoid flickering spinner
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var spinner = document.querySelector('.spinner'); | |
var content = document.querySelector('.content'); | |
var refreshButton = document.querySelector('.refreshButton'); | |
function networkRequest() { | |
return new Promise((resolve, reject) => { | |
const requestTime = 200; // request duration (for simulation) => 200ms | |
setTimeout(resolve, requestTime, { payload: { 'foo': 'bar' } }); | |
}); | |
} | |
function waitAtLeast(time, promise) { | |
const timeoutPromise = new Promise((resolve) => { | |
setTimeout(resolve, time); | |
}); | |
return Promise.all([promise, timeoutPromise]).then((values) => values[0]); | |
}; | |
function makeRequest() { | |
spinner.classList.add('visible'); // show spinner | |
let promise = networkRequest(); | |
promise = waitAtLeast(800, promise); // wait 800ms, evenif request takes less time (to avoid animation flickering) | |
promise.then((data) => { | |
content.textContent = `Updated data, payload: ${data.payload.foo + new Date()}`; | |
spinner.classList.remove('active'); // hide spinner | |
}); | |
} | |
refreshButton.addEventListener('click', () => { | |
makeRequest(); | |
}) |
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