Common string manipulation functions in JavaScript
January 1, 2009 by Geron Profet
In the last couple of years I have gathered a lot of common JavaScript functions for string manipulations. The functions below have surely helped me develop JavaScript in MS CRMÂ much faster.
//*********************************************************
gMid = function(String, Start, Length){
//gMid(String, Start, Length): Returns the substring from start to start+len
if (String == null)
return (false);
if (Start > String.length)
return "";
if (Length == null || Length.length == 0)
return (false);
return String.substr((Start - 1), Length);
}
//********************************************************
gInstr = function(fullString, subString){
//gInstr(fullString, subString): Returns the first location a substring within any string. (If the character is not found, -1 is returned.)
var a = 0;
if (fullString == null || subString == null)
return (false);
fullString = fullString.toLowerCase();
subString = subString.toLowerCase();
a = fullString.indexOf(subString);
if (a == -1)
return -1;
else
return a + 1;
}
//*********************************************************
gLeft = function(str, n){
//gLeft(str, n) : Returns everything left of a position in a string or word
if (n String(str).length)
return str;
else
return String(str).substring(0,n);
}
//*********************************************************
gRight = function(str, n){
//gRight(str, n) : Returns everything right of a position in a string or word
if (n String(str).length)
return str;
else {
var iLen = String(str).length;
return String(str).substring(iLen, iLen - n);
}
}
//*********************************************************
gLen = function(fullString){
//gLen(fullString) : The number of characters in the string
if (fullString == null)
return (false);
return String(fullString).length;
}
//*********************************************************
gLTrim = function(str){
/*
This function is used to left trim a string
Usage: function(string)
Params: str -> String you want to trim
Returns: string
Author: Geron Profet (www.crmxpg.nl)
*/
if(str+"" == "null" || str+"" == "undefined"){str="";}
return str.replace(/^[ ]+/, '');
}
//*********************************************************
gRTrim = function(str){
// This function is used to right trim a string
// Usage: function(string)
// Params: str -> String you want to trim
// Returns: string
// Author: Geron Profet (www.crmxpg.nl)
if(str+"" == "null" || str+"" == "undefined"){str="";}
return str.replace(/[ ]+$/, '');
}
//*********************************************************
gTrim = function(str){
/*
This function is used to trim a string
Usage: function(string)
Params: str -> String you want to trim
Returns: string
Calls: gLTrim()
gRTrim()
Author: Geron Profet (www.crmxpg.nl)
*/
if(str+"" == "null" || str+"" == "undefined"){str="";}
return str.replace(/^\s+|\s+$/g,"");
}
//*********************************************************
gLeftString = function(fullString, subString) {
//gLeftString(fullString,subString) : Returns everything Left of a string or word, excl. the search string
//before we begin convert params touppercase in order to compare because we want to return the original string
var fullStringUpper = fullString.toUpperCase();
var subStringUpper = subString.toUpperCase();
if (fullStringUpper.indexOf(subStringUpper) == -1) {
return "";
} else {
return (fullString.substring(0, fullStringUpper.indexOf(subStringUpper)));
}
}
//*********************************************************
gMiddleString = function(fullString, startString, endString) {
//gMiddleString(fullString, startString, endString) : Returns everything between two strings / words, reading from left to right
//before we begin convert params touppercase in order to compare because we want to return the original string
var fullStringUpper = fullString.toUpperCase();
var startStringUpper = startString.toUpperCase();
var endStringUpper = endString.toUpperCase();
if (fullStringUpper.indexOf(startStringUpper) == -1) {
return "";
} else {
var sub = fullString.substring(fullStringUpper.indexOf(startStringUpper)+startString.length, fullString.length);
subUpper=sub.toUpperCase();
if (subUpper.indexOf(endStringUpper) == -1) {
return sub;
} else {
return (sub.substring(0, subUpper.indexOf(endStringUpper)));
}
}
}
//*********************************************************
gRightString = function(fullString, subString) {
//gRightString(fullString,subString) : Returns everything Right of a string or word, excl. the search string
//before we begin convert params touppercase in order to compare because we want to return the original string
var fullStringUpper = fullString.toUpperCase();
var subStringUpper = subString.toUpperCase();
if (fullStringUpper.indexOf(subStringUpper) == -1) {
return "";
} else {
return (fullString.substring(fullStringUpper.indexOf(subStringUpper)+subString.length, fullString.length));
}
}
//*********************************************************
gRightStringIncl = function(fullString, subString) {
//gRightStringIncl(fullString,subString) : Returns everything Right of a string or word, incl. the search string
//before we begin convert params touppercase in order to compare because we want to return the original string
var fullStringUpper = fullString.toUpperCase();
var subStringUpper = subString.toUpperCase();
if (fullStringUpper.indexOf(subStringUpper) == -1) {
return "";
} else {
return (subString+fullString.substring(fullStringUpper.indexOf(subStringUpper)+subString.length, fullString.length));
}
}
//*********************************************************
gReplaceString = function(strString, strReplace, strReplaceWith){
//gReplaceString: Function to replace any string
// When replacing plain text use single quotes e.g. gReplaceString(strString,'test','testing')
if (strString != "" && strReplace != "") {
var re = new RegExp(strReplace, "gi");
var s = strString.replace(re, strReplaceWith);
return s;
}
else{
return strString;
}
}
//*********************************************************
gReplaceStringLoop = function(input, replace, replacewith){
// gReplaceStringLoop: Function to replace any string
// When replacing plain text use single quotes e.g. gReplaceStringLoop(strString,'test','testing')
for(var i = 0 ; i < input.length ; i++){
if(input.match(replace)){
input = input.replace(replace, replacewith);
}
else{
break;
}
i++;
}
return input;
}
//*********************************************************
gReplaceSingleQuote = function(strString) {
//gReplaceSingleQuote : Replace single quotes with ''
if (strString != "") {
var s = gReplaceString(strString,"'","''");
}
else{
var s = strString
}
return s;
}
//*********************************************************
gReplaceSpecialChars = function(string) {
/*
Description: This function is used to replace special chars
Params: string = string in which to replace special chars
Returns: string
Example : var name = gReplaceSpecialChars(name);
Calls: nothing
Author: Geron Profet (www.crmxpg.nl)
Version: 1.0
*/
string = string.replace(/"/g,"%22");
string = string.replace(/#/g,"%23");
string = string.replace(/&/g,"%26");
string = string.replace(/'/g,"%27");
string = string.replace("*","%2A");
string = string.replace("+","%2B");
string = string.replace(",","%2C");
return string;
}
//*********************************************************
gNullToString = function(strInput){
//gNullToString(sValue) : Function to replace Null with empty string
if(strInput+"" == "null" || strInput+"" == "undefined"){return "";}
return strInput;
}
//*********************************************************
gNullToZero = function(strInput) {
//gNullToZero : Function to replace Null with 0
if(strInput+"" == "null" || strInput+"" == "undefined"){return 0;}
return strInput;
}
Comments
2 Comments on Common string manipulation functions in JavaScript
Nils Stritzel on
Fri, 3rd Aug 2012 13:12
You might want to check the formatting of the source code.
Geron Profet on
Thu, 18th Oct 2012 14:25
Hello Nils,
Code has been updated.
Sorry for the delay.
Best regards.