Simple JavaScript Input Validation Tutorial

Make your web forms more secure by validating users input, like only allowing alphabets A to Z and numbers only, etc… Watch this tutorial to know how.

Here is the source code:

<!DOCTYPE html>
<html>
	<head>
		<title>ZK Tutorials</title>
	</head>
	<body>
		<h1>JavaScript Text Input Validaton</h1>
		<p>Preventing users from inputting not allowed characters.</p>
		<input id="userInput" placeholder="type something">
		<button onclick="validate()">Submit</button>
		<script>
			function validate(){
				var userText = document.getElementById("userInput").value;
				var allowedCharacters = /^[a-zA-Z0-9]+$/;
				if(userText.match(allowedCharacters)) alert("Input OK");
				else alert("Input Error!");
			}
		</script>
	</body>
</html>

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