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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