Dream House » pad http://sajjadhossain.com Courage to do something... Sun, 07 Nov 2010 06:45:09 +0000 en hourly 1 http://wordpress.org/?v=3.3.2 JavaScript: String trimming and padding http://sajjadhossain.com/2008/10/31/javascript-string-trimming-and-padding/#utm_source=feed&utm_medium=feed&utm_campaign=feed http://sajjadhossain.com/2008/10/31/javascript-string-trimming-and-padding/#comments Fri, 31 Oct 2008 10:59:21 +0000 Mohammad Sajjad Hossain http://sajjadhossain.com/?p=74 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:

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//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:

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//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"

Padding:

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//pads left
String.prototype.lpad = function(padString, length) {
	var str = this;
    while (str.length < length)
        str = padString + str;
    return str;
}
 
//pads right
String.prototype.rpad = function(padString, length) {
	var str = this;
    while (str.length < length)
        str = str + padString;
    return str;
}

Using Padding Functions:

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var str = "5";
alert(str.lpad("0", 5)); //result "00005"
alert(str.rpad("0", 5)); //result "50000"

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