Javascript alert box repeating.

Pravin Kumar Raja · October 30, 2019

I had 2 INPUT boxes and one BUTTON. I want to take the control back to the current INPUT after BUTTON is clicked. That part is working fine with the HTML file shown below:

<!DOCTYPE html>

<html>
	<head>
		<script>
			var last;
			function Focus(input) {
				last = input;
			}
			function Blur(input) {
			}
			function Click(button) {
				if (typeof last != "undefined")
					last.focus();
			}
		</script>
	</head>
	<body>
		<input id="I1" onfocus="Focus(this)" onblur="Blur(this)"> </input>
		<input id="I2" onfocus="Focus(this)" onblur="Blur(this)"> </input>
		<button id="B" onclick="Click(this)"> Click </button>
		<script>
		</script>
	</body>
</html>

But I wanted to code onblur function Blur to incorporate check whether the input is exited with a blank string and to return control to the blank INPUT field after displaying an alert to that effect. This displays the alert box continuously. Can you suggest how this can be avoided. Here is my code:

			function Focus(input) {
				if (typeof last != "undefined")
					if (last.value.length == 0)
						alert("Blank!");
				last = input;
			}

Funce · November 11, 2019

Well that would be because your alert code is inside your Focus function and not your Blur function.

So the alert is executing (after you've focused), then when you close the alert it refocuses which causes the alert again.

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Javascript alert box repeating.

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