How to detect Alt/Option + another key in textarea ?

Last Updated : 24 Jan, 2023

In this article, we need to Detect Alt/Option + another key in textarea by using HTML and JavaScript. It detects both the keys i.e. Alt + h. The onkeydown Event occurs when someone presses a key (on the keyboard).

Syntax:

<textarea onkeydown="newScript" >

Example: The below code illustrates to detect that when the user pressed the Alt + h keys on the textarea. It will produce an alert message.

HTML

<body> 
    <h1 style="color:green"> 
        GeeksForGeeks 
    </h1> 
      
    <h2> 
        How to detect Alt/Option + 
        another key in textarea? 
    </h2> 
      
    <textarea onkeydown="myFunction(event);"></textarea> 
      
    <script> 
        function myFunction(e) { 
          
            // It check both  altKey + 'A' or 'a'  
            if (e.altKey && e.key === "h") { 
                alert( 
            "GeeksforGeeks says Detection successfully "); 
            } 
        } 
    </script> 
</body>