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Simplest way to detect keypresses in JavaScript?
The easiest way to detect keypresses in JavaScript, use the onKeyPress event handler −
document.onkeypress
The key press is matched with the keyCode property, which returns the Unicode character code of the key that triggered the onkeypress event.
Example
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initialscale=
1.0">
<title>Document</title>
</head>
<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>
<body>
<script>
document.onkeypress = function (eventKeyName) {
eventKeyName = eventKeyName || window.event;
if(eventKeyName.keyCode==13){
console.log('You have pressed enter key');
} else {
alert(String.fromCharCode(eventKeyName.keyCode))
}
};
</script>
</body>
</html>To run the above program, save the file name “anyName.html(index.html)” and right click on the file. Select the option “Open with Live Server” in VS Code editor.
Output
This will produce the following output −
Case 1 − On pressing ENTER key, you will get the following output on console.
Case 2 − When you press any other key except ENTER, example letter g, then the same would be visible on console −
Updated on: 01-Sep-2020
212 Views
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