jQuery keyup()

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This jQuery function is worked when the keyup event occurs or it binds a function to run when a keyup event occurs.
A keyup event happens when a keyboard key is released after pressing.
There are two other events are present in jquery that is related to keyup event.

1 keydown: This event happens when a keyboard key is on its way down.

2 keypress: This event happens when a keyboard key is pressed down.

Related Topics:

jQuery bind

jQuery unbind

jQuery keyup()

Syntax:

$(selector).keyup() ;

If you want to trigger a function in it, the syntax will be:

$(selector).keyup(function);

Parameter description:

function: It represents the function to run when the keyup event is triggered. It is optional.

Example:

<html>
 <head>
 <title> jQuery Example </title>
 <script type = "text/javascript"
        src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js">
      </script>
<script>
i = 0;
$(document).ready(function(){
   $(".name").keyup(function(){
    $(this).css("background-color", "pink");
	$(".st1").html($(this).val());
	$(".st2").text(i += 1);
  });

  $(".name").keyup(function(){
    $("body").css("background", "gray");
  });


});
</script>
 </head>
 <body>

<h2> jQuery Keyup Event Example </h2>
Name: <input class="name" type="text" name="fullname"><br>
<strong class="st1"></strong><br>
Length: <strong class="st2">0</strong>
 </body>
</html>