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How to set input box to read-only in javascript

青灯夜游
Release： 2021-12-08 17:38:01
Original
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Setting method: 1. Use the "document.getElementById(id)" statement to obtain the input element object according to the specified id value; 2. Use the "input object.setAttribute("readOnly", true)" statement to obtain the input element Add read-only style.

How to set input box to read-only in javascript

The operating environment of this tutorial: windows7 system, javascript version 1.8.5, Dell G3 computer.

In JavaScript, if you want to set the input box to read-only, you only need to use the setAttribute() method to add the read-only attribute --readOnly to the input element.

The setAttribute() method adds the specified attribute and assigns it the specified value.

Grammar: 

element.setAttribute(attributename,attributevalue)
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Example: 

<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
	</head>
	<body>
		<input type="text" id="text" /><br><br>
		<input type="button" value="设为只读" id="btn" />
		<script>
			function my(id) {
				return document.getElementById(id);
			}
			my("btn").onclick = function() {
				my("text").setAttribute("readOnly", true);
			}
		</script>
	</body>
</html>
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How to set input box to read-only in javascript

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