Java Reference
In-Depth Information
The String.fromCharCode() method can then be used to convert the
event.charCode property into a single-character string representation of the character
that will appear on the screen.
This all means that if you want to know which key was pressed, you should use the key-
down event and event.keyCode property. If you want to know which character will
be displayed, you should use the keypress event and the event.keyChar property.
Add the code to see an alert dialog showing which character was pressed:
addEventListener("keypress", function (event){
console.log("You pressed the " + String.fromCharCode
(event.charCode) + " character");
Now when you press a key, you should see a message similar to this in the console:
"You pressed the J character"
"You stopped pressing the key at Wed Aug 20 2014 15:46:42
Modifier Keys
Pressing the modifier keys such as Shift , Ctrl , Alt , and meta ( Cmd on Mac) will fire the
keydown and keyup events, but not the keypress event as they don't produce any
characters on the screen.
The event object also contains information about whether a modifier key was held down
when the key event occurred. The event.shiftKey , event.ctrlKey ,
event.altKey , and event.metaKey are all properties of the event object and return
true if the relevant key is held down when the event occurred. For example, the following
code will check to see if the user has pressed the C key (which has a keycode of 32) while
holding down the Ctrl key:
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