When working with JavaScript in one of my projects I needed to trim strings and pad them. I googled for a solution and many sources I have got the following codes and sharing with you.

Trimming:

//trimming space from both side of the string
String.prototype.trim = function() {
	return this.replace(/^\s+|\s+$/g,"");
}

//trimming space from left side of the string
String.prototype.ltrim = function() {
	return this.replace(/^\s+/,"");
}

//trimming space from right side of the string
String.prototype.rtrim = function() {
	return this.replace(/\s+$/,"");
}

Using Trim Functions:

//write the code given above
var str = "  black  ";
alert("a" + str.trim() + "b");   //result "ablackb"
alert("a" + str.ltrim() + "b");  //result "ablack b"
alert("a" + str.rtrim() + "b");  //result "a blackb"

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