This functionality is not currently available in Javascript. However, tou can add this function to perform trimming in the strings. Trimming is useful in checking for empty spaces.

 function RTrim(str){	var whitespace = new String(" 	

");	var s = new String(str);	if (whitespace.indexOf(s.charAt(s.length-1)) != -1) {	    var n = s.length - 1;	    while (n >= 0 && whitespace.indexOf(s.charAt(n)) != -1){	        n--;			s = s.substring(0, n+1);		}	}	return s;}function LTrim(str){	var whitespace = new String(" 	

");	var s = new String(str);	if (whitespace.indexOf(s.charAt(0)) != -1) {	    var pos=0, m = s.length;	    while (pos < m && whitespace.indexOf(s.charAt(pos)) != -1){			pos++;			s = s.substring(pos, m);		}	}	return s;}function Trim(s){	if (s=="undefined")		return "";	else{		var tmp;		tmp = RTrim(LTrim(s));		return tmp;	}}