Detect Alt/Option + another key in textarea

Question

I want to detect when the Alt/Option key and any other key are both pressed down simultaneously in a textarea on Mac. For example, I want to check for Alt/Option + 'h':

HTML

<textarea onkeydown="myFunction(event);"></textarea>

JavaScript

function myFunction(e) {
    if (e.altKey && e.key=="h") {
        // Do something here
    }
}

The function works if I use Control instead of Alt. How can I get this to work with Alt on Mac?

JSFiddle

Devang Hingu Devang Hingu · Accepted Answer · 2020-07-11T06:39:27

You can do this by directly ASCII value e.keyCode === 65 instead of checking by e.key == 'A'


function myFunction(e)
{
    if ( e.altKey && e.keyCode === 65) //it check both  altKey + 'A' or 'a' 
  {
    //do something 
  }
}

i just did this for alt + a press. but you can do with any key by getting it's ASCII values
JsFiddle link for demo

Detect Alt/Option + another key in textarea

1 Answers