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How to enable button using Javascript

In this example we will learn how to enable the button when the user put some data in the input field.

bt.disabled = true; Is used to enable a disable button. By default in this example the button is disbaled.

<!DOCTYPE html>
<html>
<body>
	<input type="text" id="txt" onkeyup="manage(this)" />
	<input type="submit" id="btSubmit" disabled />

<script>
	function manage(txt) {
		var bt = document.getElementById('btSubmit');
		if (txt.value != '') {
			bt.disabled = false;
		}
		else {
			bt.disabled = true;
		}
	}

</script>

</body>
</html>

Run it yourself