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Passing parameters to callback functions JavaScript
Following is the code for passing parameters to callback functions 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>Passing parameters to callback functions</h1>
<div class="result"></div>
<button class="Btn">CLICK HERE</button>
<h3>Click on the above button to pass parameter to callback function add2 and call it</h3>
<script>
let resEle = document.querySelector(".result");
function add2(a) {
return a + 2;
}
function multiply9(fn, num) {
return fn(num) * 9;
}
document.querySelector(".Btn").addEventListener("click", () => {
resEle.innerHTML = "The number returned = " + multiply9(add2, 8);
});
</script>
</body>
</html>Output
On clicking the ‘CLICK HERE’ button −
Updated on: 17-Jul-2020
329 Views
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