What is onkeyup event in JavaScript?

The onkeyup event triggers when a key is released.


You can try to run the following code to learn how to work with onkeyup event in JavaScript −

            function sayHello() {
               var str = document.getElementById("subject");
               str.value = str.value.toLowerCase();
      <p>Enter subject below in upper case and see what happpens.</p>
      <input type = "text" onkeyup = "sayHello()" id = "subject">