Trim string in JavaScript

Question

How do I trim a string in JavaScript  That is  how do I remove all whitespace from the beginning and the end of the string in JavaScript

User · Answer

Although there are a bunch of correct answers above, it should be noted that the String object in JavaScript has a native .trim() method as of ECMAScript 5. Thus ideally any attempt to prototype the trim method should really check to see if it already exists first.

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

Added natively in: JavaScript 1.8.1 / ECMAScript 5

Thus supported in:

Firefox: 3.5+

Safari: 5+

Internet Explorer: IE9+ (in Standards mode only!) http://blogs.msdn.com/b/ie/archive/2010/06/25/enhanced-scripting-in-ie9-ecmascript-5-support-and-more.aspx

Chrome: 5+

Opera: 10.5+

ECMAScript 5 Support Table: http://kangax.github.com/es5-compat-table/

User · Answer

Trim code from angular js  project  var trim    function           if a reference is a  String     function isString value          return typeof value     string              native trim is way faster  http   jsperf com angular-trim-test      but IE doesn t have it     -       TODO  we should move this into IE ES5 polyfill    if   String prototype trim        return function value          return isString value              value replace    s        replace   s           value                return function value        return isString value    value trim     value                and call it as trim   hello

User · Answer

All browsers since IE9  have trim   method for strings   quot   n test  n  quot  trim       returns  quot test quot  here  For those browsers who does not support trim    you can use this polyfill from MDN  if   String prototype trim         function                Make sure we trim BOM and NBSP         var rtrim       s uFEFF xA0     s uFEFF xA0    g          String prototype trim   function                 return this replace rtrim                                That said  if using jQuery    trim str  is also available and handles undefined null   See this  String prototype trim function   return this replace    s   s   g          String prototype ltrim function   return this replace    s           String prototype rtrim function   return this replace   s            String prototype fulltrim function   return this replace           n  s   s       n   g     replace   s  g

User · Answer

Flagrant Badassery has 11 different trims with benchmark information   http   blog stevenlevithan com archives faster-trim-javascript  Non-surprisingly regexp-based are slower than traditional loop     Here is my personal one  This code is old  I wrote it for JavaScript1 1 and Netscape 3 and it has been only slightly updated since   Original used String charAt           Trim string  Actually trims all control characters      Ignores fancy Unicode spaces  Forces to string      function trim str        str   str toString        var begin   0      var end   str length - 1      while  begin  lt   end  amp  amp  str charCodeAt begin   lt  33      begin        while  end  gt  begin  amp  amp  str charCodeAt end   lt  33    --end        return str substr begin  end - begin   1

User · Answer

I know this question has been asked three years back Now String trim   was added natively in JavaScript For an instance  you can trim directly as following    document getElementById  id   value trim

User · Answer

I have a lib that uses trim  so solved it by using the following code   String prototype trim   String prototype trim    function    return jQuery trim this

User · Answer

mine uses a single regex to look for cases where trimming is necessary  and uses that regex s results to determine desired substring bounds   var illmatch      s           s     function strip me       var match  illmatch exec me      if match  amp  amp   match 1  length    match 2  length            me  me substring match 1  length  p length-match 2  length            return me     the one design decision that went into this was using a substring to perform the final capture  s        make the middle term capturing  and and the replacement fragment becomes       if match  amp  amp   match 1  length    match 3  length            me  match 2          there s two performance bets I made in these impls    does the substring implementation copy the original string s data  if so  in the first  when a string needs to be trimmed there is a double traversal  first in the regex  which may  hopefully be partial   and second in the substring extraction  hopefully a substring implementation only references the original string  so operations like substring can be nearly free  cross fingers how good is the capture in the regex impl  the middle term  the output value  could potentially be very long  i wasn t ready to bank that all regex impls  capturing wouldn t balk at a couple hundred KB input capture  but i also did not test  too many runtimes  sorry    the second ALWAYS runs a capture  if your engine can do this without taking a hit  perhaps using some of the above string-roping-techniques  for sure USE IT

User · Answer

For IE9  and other browsers  function trim text        return  text    null            trim call text

User · Answer

You can do it using the plain JavaScript   function trimString str  maxLen    if  str length  lt   maxLen    return str    var trimmed   str substr 0  maxLen   return trimmed substr 0  trimmed lastIndexOf                      Let s test it  sentenceOne    too short   sentencetwo    more than the max length    console log trimString sentenceOne  15    console log trimString sentencetwo  15

User · Answer

Use the Native JavaScript Methods  String trimLeft    String trimRight    and String trim      String trim   is supported in IE9  and all other major browsers      Hello    trim      - gt   Hello     String trimLeft   and String trimRight   are non-standard  but are supported in all major browsers except IE     Hello    trimLeft       - gt   Hello       Hello    trimRight      - gt     Hello     IE support is easy with a polyfill however   if      trimLeft        String prototype trimLeft   function             return this replace    s                   String prototype trimRight   function             return this replace   s                    if      trim            String prototype trim   function                 return this replace    s   s   g

User · Answer

If you are using jQuery  use the jQuery trim   function  For example   if  jQuery trim StringVariable

User · Answer

I have a lib that uses trim  so solved it by using the following code   String prototype trim   String prototype trim    function    return jQuery trim this

User · Answer

There are a lot of implementations that can be used  The most obvious seems to be something like this   String prototype trim   function         return this replace    s   s   g             foo bar   trim         foo bar

User · Answer

Here it is in TypeScript   var trim   input  string    gt  string   String prototype trim         input  string    string   gt            return  input        trim                   input  string    string   gt            return  input        replace    s   s   g               It will fall back to the regex if the native prototype is not available

User · Answer

The trim from jQuery is convenient if you are already using that framework      trim    your string         I tend to use jQuery often  so trimming strings with it is natural for me   But it s possible that there is backlash against jQuery out there

User · Answer

All browsers since IE9  have trim   method for strings   quot   n test  n  quot  trim       returns  quot test quot  here  For those browsers who does not support trim    you can use this polyfill from MDN  if   String prototype trim         function                Make sure we trim BOM and NBSP         var rtrim       s uFEFF xA0     s uFEFF xA0    g          String prototype trim   function                 return this replace rtrim                                That said  if using jQuery    trim str  is also available and handles undefined null   See this  String prototype trim function   return this replace    s   s   g          String prototype ltrim function   return this replace    s           String prototype rtrim function   return this replace   s            String prototype fulltrim function   return this replace           n  s   s       n   g     replace   s  g

User · Answer

There are a lot of implementations that can be used  The most obvious seems to be something like this   String prototype trim   function         return this replace    s   s   g             foo bar   trim         foo bar

User · Answer

Although there are a bunch of correct answers above, it should be noted that the String object in JavaScript has a native .trim() method as of ECMAScript 5. Thus ideally any attempt to prototype the trim method should really check to see if it already exists first.

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

Added natively in: JavaScript 1.8.1 / ECMAScript 5

Thus supported in:

Firefox: 3.5+

Safari: 5+

Internet Explorer: IE9+ (in Standards mode only!) http://blogs.msdn.com/b/ie/archive/2010/06/25/enhanced-scripting-in-ie9-ecmascript-5-support-and-more.aspx

Chrome: 5+

Opera: 10.5+

ECMAScript 5 Support Table: http://kangax.github.com/es5-compat-table/

User · Answer

You can do it using the plain JavaScript   function trimString str  maxLen    if  str length  lt   maxLen    return str    var trimmed   str substr 0  maxLen   return trimmed substr 0  trimmed lastIndexOf                      Let s test it  sentenceOne    too short   sentencetwo    more than the max length    console log trimString sentenceOne  15    console log trimString sentencetwo  15

User · Answer

Here s a very simple way   function removeSpaces string   return string split      join

User · Answer

use simply code  var str           Hello World            alert str trim       Browser support  Feature         Chrome  Firefox Internet Explorer   Opera   Safari  Edge Basic support    Yes    3 5     9                   10 5    5           For old browser add prototype  if   String prototype trim      String prototype trim   function          return this replace     s uFEFF xA0     s uFEFF xA0    g

User · Answer

If you are using jQuery  use the jQuery trim   function  For example   if  jQuery trim StringVariable

User · Answer

There are a lot of implementations that can be used  The most obvious seems to be something like this   String prototype trim   function         return this replace    s   s   g             foo bar   trim         foo bar

User · Answer

For IE9  and other browsers  function trim text        return  text    null            trim call text

User · Answer

use simply code  var str           Hello World            alert str trim       Browser support  Feature         Chrome  Firefox Internet Explorer   Opera   Safari  Edge Basic support    Yes    3 5     9                   10 5    5           For old browser add prototype  if   String prototype trim      String prototype trim   function          return this replace     s uFEFF xA0     s uFEFF xA0    g

User · Answer

Don t know what bugs can hide here  but I use this   var some string with extra spaces     goes here      console log some string with extra spaces match   S   S  S   0     Or this  if text contain enters   console log some string with extra spaces match   S  s S   S  S   0     Another try   console log some string with extra spaces match    s       s     1

User · Answer

Don t know what bugs can hide here  but I use this   var some string with extra spaces     goes here      console log some string with extra spaces match   S   S  S   0     Or this  if text contain enters   console log some string with extra spaces match   S  s S   S  S   0     Another try   console log some string with extra spaces match    s       s     1

User · Answer

The trim from jQuery is convenient if you are already using that framework      trim    your string         I tend to use jQuery often  so trimming strings with it is natural for me   But it s possible that there is backlash against jQuery out there

User · Answer

All browsers since IE9  have trim   method for strings   quot   n test  n  quot  trim       returns  quot test quot  here  For those browsers who does not support trim    you can use this polyfill from MDN  if   String prototype trim         function                Make sure we trim BOM and NBSP         var rtrim       s uFEFF xA0     s uFEFF xA0    g          String prototype trim   function                 return this replace rtrim                                That said  if using jQuery    trim str  is also available and handles undefined null   See this  String prototype trim function   return this replace    s   s   g          String prototype ltrim function   return this replace    s           String prototype rtrim function   return this replace   s            String prototype fulltrim function   return this replace           n  s   s       n   g     replace   s  g

User · Answer

Simple version here What is a general function for JavaScript trim   function trim str            return str replace    s   s   g

User · Answer

I had written this function for trim  when the  trim   function was not available in JS way back in 2008  Some of the older browsers still do not support the  trim   function and i hope this function may help somebody   TRIM FUNCTION  function trim str        var startpatt      s       var endpatt     s         while str search startpatt     0          str   str substring 1  str length        while str search endpatt     str length-1          str   str substring 0  str length-1           return str      Explanation  The function trim   accept a string object and remove any starting and trailing whitespaces  spaces tabs and newlines  and return the trimmed string  You can use this function to trim form inputs to ensure valid data to be sent   The function can be called in the following manner as an example   form elements i  value   trim form elements i  value

User · Answer

Simple version here What is a general function for JavaScript trim   function trim str            return str replace    s   s   g

User · Answer

String prototype trim   String prototype trim    function          return this replace    s   s   g           String prototype trimLeft   String prototype trimLeft    function          return this replace    s             String prototype trimRight   String prototype trimRight    function          return this replace   s              String prototype trimFull   String prototype trimFull    function          return this replace           n  s   s       n   g      replace   s  g             Shamelessly stolen from Matt duereg

User · Answer

Simple version here What is a general function for JavaScript trim   function trim str            return str replace    s   s   g

User · Answer

Trim code from angular js  project  var trim    function           if a reference is a  String     function isString value          return typeof value     string              native trim is way faster  http   jsperf com angular-trim-test      but IE doesn t have it     -       TODO  we should move this into IE ES5 polyfill    if   String prototype trim        return function value          return isString value              value replace    s        replace   s           value                return function value        return isString value    value trim     value                and call it as trim   hello

User · Answer

String prototype trim   String prototype trim    function          return this replace    s   s   g           String prototype trimLeft   String prototype trimLeft    function          return this replace    s             String prototype trimRight   String prototype trimRight    function          return this replace   s              String prototype trimFull   String prototype trimFull    function          return this replace           n  s   s       n   g      replace   s  g             Shamelessly stolen from Matt duereg

User · Answer

Simple version here What is a general function for JavaScript trim   function trim str            return str replace    s   s   g

User · Answer

All browsers since IE9  have trim   method for strings   quot   n test  n  quot  trim       returns  quot test quot  here  For those browsers who does not support trim    you can use this polyfill from MDN  if   String prototype trim         function                Make sure we trim BOM and NBSP         var rtrim       s uFEFF xA0     s uFEFF xA0    g          String prototype trim   function                 return this replace rtrim                                That said  if using jQuery    trim str  is also available and handles undefined null   See this  String prototype trim function   return this replace    s   s   g          String prototype ltrim function   return this replace    s           String prototype rtrim function   return this replace   s            String prototype fulltrim function   return this replace           n  s   s       n   g     replace   s  g

User · Answer

Here it is in TypeScript   var trim   input  string    gt  string   String prototype trim         input  string    string   gt            return  input        trim                   input  string    string   gt            return  input        replace    s   s   g               It will fall back to the regex if the native prototype is not available

User · Answer

Here s a very simple way   function removeSpaces string   return string split      join

User · Answer

Use the Native JavaScript Methods  String trimLeft    String trimRight    and String trim      String trim   is supported in IE9  and all other major browsers      Hello    trim      - gt   Hello     String trimLeft   and String trimRight   are non-standard  but are supported in all major browsers except IE     Hello    trimLeft       - gt   Hello       Hello    trimRight      - gt     Hello     IE support is easy with a polyfill however   if      trimLeft        String prototype trimLeft   function             return this replace    s                   String prototype trimRight   function             return this replace   s                    if      trim            String prototype trim   function                 return this replace    s   s   g

User · Answer

The trim from jQuery is convenient if you are already using that framework      trim    your string         I tend to use jQuery often  so trimming strings with it is natural for me   But it s possible that there is backlash against jQuery out there

User · Answer

mine uses a single regex to look for cases where trimming is necessary  and uses that regex s results to determine desired substring bounds   var illmatch      s           s     function strip me       var match  illmatch exec me      if match  amp  amp   match 1  length    match 2  length            me  me substring match 1  length  p length-match 2  length            return me     the one design decision that went into this was using a substring to perform the final capture  s        make the middle term capturing  and and the replacement fragment becomes       if match  amp  amp   match 1  length    match 3  length            me  match 2          there s two performance bets I made in these impls    does the substring implementation copy the original string s data  if so  in the first  when a string needs to be trimmed there is a double traversal  first in the regex  which may  hopefully be partial   and second in the substring extraction  hopefully a substring implementation only references the original string  so operations like substring can be nearly free  cross fingers how good is the capture in the regex impl  the middle term  the output value  could potentially be very long  i wasn t ready to bank that all regex impls  capturing wouldn t balk at a couple hundred KB input capture  but i also did not test  too many runtimes  sorry    the second ALWAYS runs a capture  if your engine can do this without taking a hit  perhaps using some of the above string-roping-techniques  for sure USE IT

User · Answer

The trim from jQuery is convenient if you are already using that framework      trim    your string         I tend to use jQuery often  so trimming strings with it is natural for me   But it s possible that there is backlash against jQuery out there

User · Answer

I had written this function for trim  when the  trim   function was not available in JS way back in 2008  Some of the older browsers still do not support the  trim   function and i hope this function may help somebody   TRIM FUNCTION  function trim str        var startpatt      s       var endpatt     s         while str search startpatt     0          str   str substring 1  str length        while str search endpatt     str length-1          str   str substring 0  str length-1           return str      Explanation  The function trim   accept a string object and remove any starting and trailing whitespaces  spaces tabs and newlines  and return the trimmed string  You can use this function to trim form inputs to ensure valid data to be sent   The function can be called in the following manner as an example   form elements i  value   trim form elements i  value

User · Answer

I know this question has been asked three years back Now String trim   was added natively in JavaScript For an instance  you can trim directly as following    document getElementById  id   value trim

User · Answer

There are a lot of implementations that can be used  The most obvious seems to be something like this   String prototype trim   function         return this replace    s   s   g             foo bar   trim         foo bar

User · Answer

Flagrant Badassery has 11 different trims with benchmark information   http   blog stevenlevithan com archives faster-trim-javascript  Non-surprisingly regexp-based are slower than traditional loop     Here is my personal one  This code is old  I wrote it for JavaScript1 1 and Netscape 3 and it has been only slightly updated since   Original used String charAt           Trim string  Actually trims all control characters      Ignores fancy Unicode spaces  Forces to string      function trim str        str   str toString        var begin   0      var end   str length - 1      while  begin  lt   end  amp  amp  str charCodeAt begin   lt  33      begin        while  end  gt  begin  amp  amp  str charCodeAt end   lt  33    --end        return str substr begin  end - begin   1

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