How do I make control characters programatically in Javascript?

Question

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.

?? But "control" characters are just characters; if you know the numeric value for the character, you use "fromCharCode()" in exactly the same way. — Pointy
– 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
– fent, Commented Dec 5, 2011 at 14:52
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
– Pointy, Commented Dec 5, 2011 at 14:56

Gijs · Accepted Answer · 2011-12-05 14:44:06Z

9

Sounds to me like you could just use this list: http://en.wikipedia.org/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

answered Dec 5, 2011 at 14:44

Gijs

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Marc B · Accepted Answer · 2011-12-05 14:44:43Z

3

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

answered Dec 5, 2011 at 14:44

Marc B

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1 Comment

Pointy Over a year ago

Octal escape sequences are not standard and disallowed in "strict" mode. Hex escape sequences look like \0x000D, with four-digit hex values.

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