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.
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)
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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