AngularJS ng-keyup Directive

Last Updated : 11 Jul, 2025

The ng-keyup Directive in AngluarJS is used to apply custom behavior on a keyup event. It is supported by <input>, <select> and <textarea> elements.

Syntax:

<element ng-keyup="expression"> Contents... </element>

Parameter:

expression: When a keypress is finished, then the followed expression will be executed.

Example 1: This example uses ng-keyup Directive to change the background color when key up and down the button.

HTML

<!DOCTYPE html>
<html>

<head>
    <title>ng-keyup Directive</title>
    <script src=
"https://ajax.googleapis.com/ajax/libs/angularjs/1.6.9/angular.min.js">
    </script>

    <style type="text/css">
        .keyDown {
            background-color: yellow;
            color: black;
        }
        .keyUp {
            background-color: green;
            color: white;
        }
    </style>
</head>

<body ng-app style="text-align:center">
    <h1 style="color:green">
        GeeksforGeeks
    </h1>
    <h2>ng-keyup Directive</h2>
    <div>
        <b>Enter Name: </b>
        <input type="text" 
               ng-model="searchValue" 
               ng-keydown="keyDown=true" 
               ng-keyup="keyDown=false"
               ng-class=
        "{true:'keyDown', false:'keyUp'}[keyDown]" />
        <br>
    </div>
</body>
</html>

Output:

Example 2: This example uses the ng-keyup Directive to change the font-color, font-family & font-size when key up and down the button.

HTML

<!DOCTYPE html>
<html>

<head>
    <title>ng-keyup Directive</title>

    <script src=
"https://ajax.googleapis.com/ajax/libs/angularjs/1.6.9/angular.min.js">
    </script>

    <style type="text/css">
        .keyDown {
            font-family: 'Times New Roman', Times, serif;
            font-size: 7px;
        }
        .keyUp {
            font-family: Arial;
            font-size: 35px;
            color: green;
        }
    </style>
</head>

<body ng-app style="text-align:center">
    <h1 style="color:green">
        GeeksforGeeks
    </h1>
    <h2>ng-keyup Directive</h2>
    <div>
        <b>Enter Name: </b>
            <input type="text" 
                   ng-model="searchValue" 
                   ng-keydown="keyDown=true" 
                   ng-keyup="keyDown=false"
                   ng-class=
            "{true:'keyDown', false:'keyUp'}[keyDown]" />
        <br>
    </div>
</body>
</html>