AngularJS | ng-keyup Directive

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>

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



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<!DOCTYPE html>
<html>
      
<head>
    <title>ng-keyup Directive</title>
      
    <script src=
    </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>

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Output:
When key is down:
ngkeyup
When key is up:
ngkeyup



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