CRLF on Various Systems and Web Programming

Carriage Return (CR) and Line Feed (LF) are common character in computer programming. Different systems use them differently.

CRLF = 0D,0A = 13,10 = \r\n

New line on different systems:

• Windows: \r\n
• Mac: \r
• Linux: \n
• HTML textarea tag: \n
• expect: \r

Check JavaScript event Enter key

HTML ('event' is lower case to work in Firefox):

<input onkeyup="check_enter(event);"/>

JS code:

function check_enter(Event){

  if (Event.keyCode==13)

    console.log("Enter key pressed");

}