How can I get file extensions with JavaScript?

Question

See code:

var file1 = \"50.xsl\";
var file2 = \"30.doc\";
getFileExtension(file1); //returns xsl
getFileExtension(file2); //returns doc

function getFileExt         


        

Answer 1

i just wanted to share this.

fileName.slice(fileName.lastIndexOf('.'))

although this has a downfall that files with no extension will return last string. but if you do so this will fix every thing :

   function getExtention(fileName){
     var i = fileName.lastIndexOf('.');
     if(i === -1 ) return false;
     return fileName.slice(i)
   }