Convert JavaScript String to be all lower case

Question

How can I convert a JavaScript string value to be in all lower case letters  Example   quot Your Name quot  to  quot your name quot

User · Answer

Use either toLowerCase or toLocaleLowerCase methods of the String object. The difference is that toLocaleLowerCase will take current locale of the user/host into account. As per § 15.5.4.17 of the ECMAScript Language Specification (ECMA-262), toLocaleLowerCase…

…works exactly the same as toLowerCase except that its result is intended to yield the correct result for the host environment’s current locale, rather than a locale-independent result. There will only be a difference in the few cases (such as Turkish) where the rules for that language conflict with the regular Unicode case mappings.

Example:

var lower = 'Your Name'.toLowerCase();

Also note that the toLowerCase and toLocaleLowerCase functions are implemented to work generically on any value type. Therefore you can invoke these functions even on non-String objects. Doing so will imply automatic conversion to a string value prior to changing the case of each character in the resulting string value. For example, you can apply toLowerCase directly on a date like this:

var lower = String.prototype.toLowerCase.apply(new Date());

and which is effectively equivalent to:

var lower = new Date().toString().toLowerCase();

The second form is generally preferred for its simplicity and readability. On earlier versions of IE, the first had the benefit that it could work with a null value. The result of applying toLowerCase or toLocaleLowerCase on null would yield null (and not an error condition).

User · Answer

Just an examples for toLowerCase    toUpperCase   and prototype for not yet available toTitleCase   or toPropperCase     x000D   x000D  String prototype toTitleCase   function     x000D    return this split      map i   gt  i 0  toUpperCase     i substring 1  toLowerCase    join       x000D    x000D   x000D  String prototype toPropperCase   function     x000D    return this toTitleCase    x000D    x000D   x000D  var OriginalCase    Your Name   x000D  var lowercase   OriginalCase toLowerCase    x000D  var upperCase   lowercase toUpperCase    x000D  var titleCase   upperCase toTitleCase    x000D   x000D  console log  Original      OriginalCase   x000D  console log  toLowerCase        lowercase   x000D  console log  toUpperCase        upperCase   x000D  console log  toTitleCase        titleCase   x000D   x000D   x000D    edited 2018

User · Answer

I payed attention that lots of people are looking for strtolower   in JavaScript  They are expecting the same function name as in other languages  that s why this post is here   I would recommend using native Javascript function    SomE StriNg  toLowerCase    Here s the function that behaves exactly the same as PHP s one  for those who are porting PHP code into js   function strToLower  str        return String str  toLowerCase

User · Answer

In case you want to build it yourself   function toLowerCase string     let lowerCaseString        for  let i   0  i  lt  string length  i            find ASCII charcode     let charcode   string charCodeAt i          if uppercase     if  charcode  gt  64  amp  amp  charcode  lt  97             convert to lowercase         charcode   charcode   32              back to char     let lowercase   String fromCharCode charcode          append     lowerCaseString   lowerCaseString concat lowercase      return lowerCaseString

User · Answer

Opt 1  using toLowerCase   var x    ABC   x   x toLowerCase     Opt 2  Using your own function function convertToLowerCase str      var result          for  var i   0  i  lt  str length  i          var code   str charCodeAt i       if  code  gt  64  amp  amp  code  lt  91          result    String fromCharCode code   32         else         result    str charAt i               return result     Call it as  x   convertToLowerCase x

User · Answer

var lowerCaseName    Your Name  toLowerCase

User · Answer

Yes  any string in JavaScript has a toLowerCase   method that will return a new string that is the old string in all lower case   The old string will remain unchanged   So  you can do something like    Foo  toLowerCase    document getElementById  myField   value toLowerCase

User · Answer

Try   lt input type  text  style  text-transform  uppercase  gt     uppercase  lt input type  text  style  text-transform  lowercase  gt     lowercase   Demo - JSFiddle

User · Answer

Simply use JS toLowerCase   let v    Your Name   let u   v toLowerCase    or let u    Your Name  toLowerCase

User · Answer

you can use the in built  toLowerCase   method on javascript strings  ex  var x    Hello   x toLowerCase

User · Answer

toLocaleUpperCase   or lower case functions don t behave like they should do   For example in my system  Safari 4  Chrome 4 Beta  Firefox 3 5 x it converts strings with Turkish characters incorrectly   The browsers respond to navigator language as  en-US    tr    en-US  respectively   But there is no way to get user s Accept-Lang setting in the browser as far as I could find   Only Chrome gives me trouble although I have configured every browser as tr-TR locale preferred   I think these settings only affect HTTP header  but we can t access to these settings via JS   In the Mozilla documentation it says  The characters within a string are converted to     while respecting the current locale   For most languages  this will return the same as        I think it s valid for Turkish  it doesn t differ it s configured as en or tr   In Turkish it should convert  DIN    to  din    and  DIN    to  din    or vice-versa

User · Answer

Tray this short way   var lower    str  quot  quot   toLowerCase

User · Answer

Method or Function      toLowerCase        toUpperCase    Description  These methods are used to cover a string or alphabet from lower case to upper case or vice versa  e g   and  to  AND    Converting to Upper Case - Example Code -   lt script language javascript gt  var ss     testing case conversion method    var result   ss toUpperCase    document write result    lt  script gt    Result  TESTING CASE CONVERSION METHOD  Converting to Lower Case -  Example Code    lt script language javascript gt  var ss     TESTING LOWERCASE CONVERT FUNCTION    var result   ss toLowerCase    document write result    lt  script gt    Result  testing lowercase convert function  Explanation  In the above examples   toUpperCase   method converts any string to  UPPER  case letters  toLowerCase   method converts any string to  lower  case letters

User · Answer

Note that the function will ONLY work on STRING objects   For instance  I was consuming a plugin  and was confused why I was getting a   extension tolowercase is not a function  JS error    onChange  function file  extension              alert  extension toLowerCase    gt     extension toLowerCase       lt        Which produced the error  extension toLowerCase is not a function  So I tried this piece of code  which revealed the problem   alert   typeof extension   gt      typeof extension      lt         The output was  typeof extension   object lt    - so AhHa  I was NOT getting a string var for my input   The fix is straight forward though - just force the darn thing into a String    var extension   String extension     After the cast  the extension toLowerCase   function worked fine

[javascript] Convert JavaScript String to be all lower case?

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