You can use the concept of value(). Following is the JavaScript code −
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>
<link rel="stylesheet" href="//code.jquery.com/ui/1.12.1/themes/base/jquery-ui.css">
<script src="https://code.jquery.com/jquery-1.12.4.js"></script>
<script src="https://code.jquery.com/ui/1.12.1/jquery-ui.js"></script>
</head>
<body>
<label for="">FirstNumber </label><input type="textbox" name="input1"><br>
<label for="">SecondNumber: </label><input type="textbox" name="input2"><br>
<button onClick="add()">Add Two Nnumbers</button><br>
<label for="displayValue">The addition is: </label><input type="textbox" name="display">
<script>
function add() {
var f = parseInt(document.getElementsByName('input1')[0].value);`
var s =parseInt(document.getElementsByName('input2')[0].value);
var result = f+s;
document.getElementsByName('display')[0].value= result;
}
</script>
</body>
</html>To run the above program, save the file name anyName.html(index.html) and right click on the file and select the option open with live server in VS code editor.
Output
On clicking the button, the value will be displayed in the textbox. The snapshot is as follows −
