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<!DOCTYPE html>
<html>
<body>
​
<input type="button" id="myBtn" value="My Button">
<br>
​
<button onclick="disableBtn()">Disable "My Button"</button>
<button onclick="undisableBtn()">Undisable "My Button"</button>
​
<script>
function disableBtn() {
  document.getElementById("myBtn").disabled = true;
}
​
function undisableBtn() {
  document.getElementById("myBtn").disabled = false;
}
</script>
​
</body>
​
<!-- Mirrored from www.w3schools.com/jsref/tryit.asp?filename=tryjsref_button_disabled3 by HTTrack Website Copier/3.x [XR&CO'2014], Mon, 27 Jan 2020 03:17:14 GMT -->
</html>
​
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