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How to implement asynchronous loop in JavaScript?
Following is the code to implement asynchronous loop in JavaScript −
Example
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Document</title>
<style>
body {
font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
}
.result {
font-size: 20px;
font-weight: 500;
color: blueviolet;
}
</style>
</head>
<body>
<h1>Asynchronous loop in JavaScript</h1>
<div class="result"></div>
<button class="Btn">CLICK HERE</button>
<h3>Click on the above button to start our asynchronous loop</h3>
<script>
let resEle = document.querySelector(".result");
async function waitTime(time) {
return new Promise((resolve) => {
setTimeout(resolve, time);
});
}
async function someFunction() {
for (let i = 0; i < 10; i++) {
await waitTime(2000);
resEle.innerHTML += "i = " + i + "<br>";
}
}
document.querySelector(".Btn").addEventListener("click", () => {
someFunction();
});
</script>
</body>
</html>Output
On clicking the ‘CLICK HERE’ button the loop will print 1 to 10 −
Updated on: 17-Jul-2020
104 Views
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