How do I make control characters programatically in Javascript? - Stack Overflow

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In Javascript I can type '\u00A3' to get a character using its char code. I can do this programatically to with String.fromCharCode(parseInt('00A3', 16)).

But I can't find a way to do the same for a control character. I can type them in my source code but I want a way to generate them in code.

In Javascript I can type '\u00A3' to get a character using its char code. I can do this programatically to with String.fromCharCode(parseInt('00A3', 16)).

But I can't find a way to do the same for a control character. I can type them in my source code but I want a way to generate them in code.

• javascript
• special-characters

Share Improve this question Follow asked Dec 5, 2011 at 14:36 fentfent 18.2k1616 gold badges9090 silver badges9191 bronze badges 3

• 1 ?? But "control" characters are just characters; if you know the numeric value for the character, you use "fromCharCode()" in exactly the same way. – Pointy Commented Dec 5, 2011 at 14:43
• I know the numeric value for \u00A3, but not for Ctrl + B. I have to look it up. I was wondering if there was a way Javascript could look that up for me. – fent Commented Dec 5, 2011 at 14:52
• 1 Control characters "Control A" through "Control Z" are just characters 1 through 26 (decimal); in other words, Ctrl-A is 0x0001, Ctrl-B is 0x0002, etc. Thus, you could find the code for the letter ("A") and subtract 64 from its code value. – Pointy Commented Dec 5, 2011 at 14:56

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2 Answers 2

Sorted by: Reset to default 9

Sounds to me like you could just use this list: http://en.wikipedia/wiki/C0_and_C1_control_codes and use the character points defined there to insert them with \u or String.fromCharCode as in your example?

PS: instead of the parseInt, you could use a literal: 0x00A3

You can easily embed octal numbers:

var crlf = '\013' + '\012'; // octal numbers
alert('hello' + crlf + 'there'); // shows hello\n\rthere

Doesn't work the same for hex, though:

var clrf = '\0xD' + '\0xA'; // hex
alert('hello' + crlf + 'there'); // shows helloxDxAthere

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