jQuery find file extension from string

Question

I was wondering if it was possible for jQuery to find a file extension based on a returned string   A filename  string  will be passed to a function  openFile  and I wanted that function to do different things based on what file has been passed through  it could be image files or pdf files   function openFile file          if  jpg  gif  png do something      if  zip  rar do something else      if  pdf do something else       I ve been looking for something that will find the file s extension but I can t seem to find anything

User · Answer

Try this   var extension   fileString substring fileString lastIndexOf        1

User · Answer

Yet another way to write it up   function getExtension filename        return filename split      pop   toLowerCase       function openFile file         switch getExtension file               if  jpg  gif  png do something         case  jpg   case  gif   case  png                  handle                break            if  zip  rar do something else         case  zip   case  rar                  handle                break             if  pdf do something else         case  pdf                  handle                break

User · Answer

You can use a combination of substring and lastIndexOf  Sample  var fileName    test jpg   var fileExtension   fileName substring fileName lastIndexOf        1

User · Answer

var fileName    file txt       Getting Extension  var ext   fileName split      1       OR  var ext   fileName split      pop

User · Answer

Since the extension will always be the string after a period in a complete partial file name  just use the built in split function in js  and test the resultant extension for what you want it to do  If split returns only one piece   no pieces  it does not contain an extension

User · Answer

How about something like this   Test the live example  http   jsfiddle net 6hBZU 1   It assumes that the string will always end with the extension   function openFile file        var extension   file substr   file lastIndexOf       1         switch extension            case  jpg           case  png           case  gif               alert  was jpg png gif        There s was a typo in the example where         break                             the alert ended with pdf instead of gif          case  zip           case  rar               alert  was zip rar            break          case  pdf               alert  was pdf            break          default              alert  who knows              openFile  somestring png      EDIT  I mistakenly deleted part of the string in openFile  somestring png     Corrected  Had it in the Live Example  though

User · Answer

Another way  which avoids extended switch-case statements  is to define arrays of file extensions for similar processing and use a function to check the extension result against an array  with comments       Define valid file extension arrays  according to your needs  var  docExts     pdf    doc    docx    odt    var  imgExts     jpg    jpeg    png    gif    ico       Checks whether an extension is included in the array function isExtension ext  extnArray        var result   false      var i      if  ext            ext   ext toLowerCase            for  i   0  i  lt  extnArray length  i                  if  extnArray i  toLowerCase       ext                    result   true                  break                                    return result       Test file name and extension var testFileName    example-filename jpeg      Get the extension from the filename var extn   testFileName split      pop       boolean check if extensions are in parameter array var isDoc   isExtension extn   docExts   var isImg   isExtension extn   imgExts   console log     gt  isDoc      isDoc       gt  isImg      isImg      Process according to result  if isDoc          etc

User · Answer

To get the file extension  I would do this   var ext   file split      pop

[jquery] jQuery find file extension (from string)

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