extract file extention js code example

Example 1: javascript get file extension

var fileName = "myDocument.pdf";
var fileExtension = fileName.split('.').pop(); //"pdf"

Example 2: get file extension file upload control in javascript

<input id='inputfile' type='file' name='inputfile' onChange='getoutput()'><br>
    Output Filename <input id='outputfile' type='text' name='outputfile'><br>
    Extension <input id='extension' type='text' name='extension'>