CODEWITHSUNDEEP
javascriptkeycode
Pavel Durov
Pavel Durov

Reputation: 1297

Converting Javascript Key Code to Char and vice versa

I'm working on HTML input filtering, and I have the following situation:

I need to convert keyCodes to chars, but when I'm dealing with Numpad keys I get weird outcome:

String.fromCharCode(96) //should be 0 but I recieve "`"
String.fromCharCode(97) //should be 1 but I recieve "a"
String.fromCharCode(98) //should be 2 but I receive "b"
String.fromCharCode(99) //should be 3 but I recieve "c"
String.fromCharCode(100) //should be 4 but I recieve "d"
String.fromCharCode(101) //should be 5 but I recieve "e"
String.fromCharCode(102) //should be 6 but I recieve "f"
String.fromCharCode(103) //should be 7 but I recieve "g"

From documentation and from event debugging I can see the following mapping:

numpad 0    96
numpad 1    97
numpad 2    98
numpad 3    99
numpad 4    100
numpad 5    101
numpad 6    102
numpad 7    103

link: https://www.cambiaresearch.com/articles/15/javascript-char-codes-key-codes

What am I missing here?

Upvotes: 0

Views: 2591

Answers (3)

Pavel Durov
Pavel Durov

Reputation: 1297

Ok, so accordingly to several sources from the web I should do the following logic:

if(keyCode >= 96 && keyCode <= 105){
    keyCode -= 48;
}

Wierd that String.fromCharCode function docs doens't say anything about it :(

Upvotes: 0

Sergey Benzenko
Sergey Benzenko

Reputation: 280

Use the ASCII table to get char codes.

Upvotes: 1

Michael Mikowski
Michael Mikowski

Reputation: 1279

Might just be a silly mistake. Charcode you should see is 48-57 for the numbers. 

for ( let i = 0; i < 10; i++ ) {
  console.log( String.fromCharCode( 48 + i ) );
}

See man ascii

Upvotes: 0

Related Questions