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

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  • Last Updated : 24 Jan, 2023
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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).


<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.


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

Note: We can also use ASCII code for detecting the keys. 



Supported Browsers are listed below:

  • Google Chrome
  • Internet Explorer
  • Firefox
  • Opera
  • Safari
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