HOW TO USE JAVASCRIPT TO DISPLAY ERROR MESSAGE WHEN BUTTON IS CLICKED OR TRIGERED
<!DOCTYPE html>
<html>
<body>
<p>Enter a number and click OK:</p>
<input id="id1" type="number" min="1" max="10" required>
<button onclick="myFunction()">OK</button>
<p>If the number is less than 100 or greater than 300, an error message will be displayed.</p>
<p id="demo"></p>
<script>
function myFunction() {
var inpObj = document.getElementById("id1");
if (inpObj.checkValidity() == false) {
document.getElementById("demo").innerHTML = inpObj.validationMessage;
} else {
document.getElementById("demo").innerHTML = "Input OK";
}
}
</script>
</body>
</html>
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