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String.prototype.trim = function() {
a = this.replace(/^\s+/, '');
return a.replace(/\s+$/, '');
};

alert(" test" + " this ".trim() )

<input type="test" onchange="this.value=this.value.trim()" >

Comments

Dragon Cotterill (Mon 13 Mar 2006 06:48 AM) website / e-mail

Ummm. Is that a typo? Surely the alert above should return " testthis".

You could shorten this to something like;

return this.replace(/^\s*(\b.*\b|)\s*$/, '');

which will remove leading/trailing whitespaces. But does anybody have anything which will act like @Trim and cut out whitespaces in the middle of strings?

Jake (Mon 13 Mar 2006 07:05 AM)

Woops. Yes. It is and it will.

Dragon Cotterill (Mon 13 Mar 2006 07:06 AM) website / e-mail

Ah. Here we go. A Regexp which will remove repeated whitespaces and replace with a single space.

return this.replace(/^\s*|\s(?=\s)|\s*$/g, "");

Not perfect (turns tabs into spaces) but close enough for me.

John Z Marshall (Mon 13 Mar 2006 07:14 AM) website / e-mail

Trim is always useful. That's why I have these:

String.prototype.trim = function() {

return this.replace(/(?:(?:^|\n)\s+|\s+(?:$|\n))/g,"");

}

String.prototype.fulltrim = function() {

return this.replace(/(?:(?:^|\n)\s+|\s+(?:$|\n))/g,"").replace(/\s+/g," ");

}

Not sure whether they bring anything else to the party. But I have been using them for a long while and hand no complaints, yet.

Vince (Mon 13 Mar 2006 08:03 AM) website / e-mail

A couple other handy ones include:

String.prototype.right = function(count) {

return this.substr(this.length - count);

}

String.prototype.left = function(count) {

return this.substr(0, count);

}

Ron Yuen (Tue 14 Mar 2006 04:02 AM)

Duplicating Lotusscript/@Formula functions in Javascript is frequently useful, I have found the @Unique(list) capability especiually so.

here is a JS version :

Array.prototype.indexOf = function(str,ignoreCase) {

// return the index of the first instance of str in the array

// else -1 if not a member

// if a string array can take a flag to request case match

// if (ignoreCase) then 'StringA' is considered the same as 'sTrinGa'

var tmp ;

if (typeof(str)=="string" && ignoreCase) {

str = str.toLowerCase() ;

}

for (var i=0; i<this.length; i++) {

if (typeof(str)=="string" && ignoreCase) {

tmp=this[i].toLowerCase() ;

} else {

tmp=this[i] ;

}

if (tmp==str) return i ;

}

return -1 ;

}

Array.prototype.isMember = function(str,ignoreCase) {

return this.indexOf(str,ignoreCase) > -1 ;

}

Array.prototype.unique = function(ignoreCase) {

// creates a unique array

// empty arrays are always unique !

if (this.length==0) return this ;

// default to respect case

// if (ignoreCase) then 'StringA' is considered the same as 'sTrinGa'

if (arguments.length==0) ignoreCase = false ;

var newList = new Array(this[0]) ;

var found,tmp1,tmp2 ;

for (var i=0; i<this.length; i++) {

if (!newList.isMember(this[i],ignoreCase)) newList.push(this[i]) ;

}

return newList ;

}

To be really bulletproof you may want to check that the browser supports array.push() and if not then implement one !

Regards

Ron Yuen

Ady (Wed 17 May 2006 01:56 PM) e-mail

Hi Jake et al,

Anyone know how 'fully' @Trim an html textarea?

e.g. create an editable text field with, say 5 rows and 20 cols, and allow multiple values. Then populate the text area with just spaces and carriage returns.

If you put @Trim(@ThisValue) in the Input Translation and submit the form then all the 'whitespace' is removed, but there doesn't seem to be a way to do this in javascript prior to submitting the form...

Any ideas anyone?!

Robert (Mon 14 Aug 2006 08:34 PM)

//*** removes whitespace fom begining and end of a string and returns it to whereever.

function trim(string){

if(string.indexOf(" ") == 0){

while(string.indexOf(" ") < 1){

string = string.substring(1,string.length) ;

}

}

if(string.substring(string.length-1,string.length) == " "){

while(string.substring(string.length-1,string.length) == " "){

string = string.substring(0,string.length-1) ;

}

}

return string;

}

function yourFunction(str){

....

str = trim(str);

....

}

Jorge (Mon 25 Sep 2006 07:32 AM) website / e-mail

Thank you very much.

This little func was just what i was looking for.

Keep it up !

Pete (Fri 5 Jan 2007 06:24 AM)

Robert's code is flawed. If the string has leading spaces but no trailing spaces then it will get caught in an infinite loop.

Here's a version that will allow for leading spaces only, trailing spaces only, both leading and trailing spaces and no leading or trailing spaces.

function trim(string){

' remove leading spaces

while(string.substr(0,1)==" ")

string = string.substring(1,string.length) ;

' remove trailing spaces

while(string.substr(string.length-1,1)==" ")

string = string.substring(0,string.length-2) ;

return string;

}

Sowmya (Thu 8 Mar 2007 03:31 AM) e-mail

I need the following output:

I have a variable in which the value it has is:

" 1 : 3300"

I need to trim it to 3300 and store it as an integer.

How is it possible?

Please do reply.

Thank you,

Regards,

Sowmya,

Bangalore, India

Rochak Chauhan (Wed 17 Oct 2007 12:44 PM) website / e-mail

There are many required functions which are not available in Native JavaScript.Get trim and more functions like trim() for JavaScript:

{Link}

Russell (Thu 14 Feb 2008 11:34 PM)

Sowmya ,

use trim function...

smthing like

strObj.trim(":")[1]

Ryan (Wed 21 May 2008 09:37 AM) website / e-mail

Have a look at this article for more ways of implementing javascript trim: {Link}

Jason (Thu 5 Feb 2009 05:43 PM) e-mail

I looked through these functions trying a few of the examples finding them to behave differently then what I was looking for as a quick fix. When I think of a trim function I am thinking the results return a string minus the leading and trailing spaces.

For you who wanted to remove all spaces, there is no reason to loop through a string to remove them.. just use str.replace(' ',''); end of story.

I ended up writing this little script prototyping String as well, this will remove all leading and trailing spaces leaving the inner string untouched. Hope it helps..

String.prototype.trim = function() {

var str = this;

var firstChar = str.substring(0,1);

while(firstChar == ' '){

str = str.substring(1,(str.length))

firstChar = str.substring(0,1);

}

var lastChar = str.substring(str.length - 1, str.length);

while(lastChar == ' '){

str = str.substring(0,str.length - 1);

lastChar = str.substring(str.length - 1, str.length);

}

return str;

}

DUzun (Sat 7 Feb 2009 01:28 PM) website / e-mail

I don't like using regexp, but sometimes you need to remove the tabs too, not only the spaces.

The above example is good, but it is very slow!

Using str = str.substr(0, str.length-1) in a loop is not a good practice, just because it copies the entire string a lot of times.

I prefer checking where is the begining and the end of my trimed string, then to cut it at once:

String.prototype.trim = function()

{

var b = 0 ;

var e = this.length - 1 ;

while( this.substr(b, 1).match(/\s/) ) b++ ;

while( this.substr(e, 1).match(/\s/) ) e-- ;

return this.substr(b, e-b+1);

}

Hope this will help somebody!

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