A javascript function that converts a text string into binary and binary into a text string.

asciibin.js

function asciibin(convert, type) {
	
	//if this is binary...
	if (type == 'binary') {
		//strip any white space
		convert = convert.replace(/ /g,'');
		
		//remove any line breaks
		convert = convert.replace(/\n/g,'');
		
		var ascii_string = '';
		var current_byte;
		
		//if the binary does not consist of 8 digit chunks (bytes)
		if (convert.length % 8 != 0) {return 'Binary length is not divisible by eight.'}
		
		//otherwise
		else {
			//split it into bytes
			for (var i=0; i < convert.length/8; i++) {
			
				//get the current byte
				current_byte = convert.substring(i*8, (i*8)+8);
			
				//get the charcode from the current_byte and add it to the ascii_string
				ascii_string += String.fromCharCode(parseInt(current_byte, 2));
			}
			return ascii_string;
		}
	}
	
	//if this is an ASCII
	if (type == 'ascii') {
		var binary_string = '';
		var current_letter;
		
		//separate the letters
		for (var i=0; i < convert.length; i++) {
			//get the current letter, pull the char code, and convert to binary
			current_letter = convert.substring(i, i + 1).charCodeAt(0).toString(2);
			
			//if the 'byte' is less than eight values prepend some zeros
			if (current_letter.length < 8) {
				while(current_letter.length < 8) {
					current_letter = '0' + current_letter;
				}	
			}
			binary_string += current_letter;
		}
		return binary_string;
	}
}