javascript get extension from filename with input code example
Example 1: javascript get file extension from string
// Use the lastIndexOf method to find the last period in the string, and get the part of the string after that:
var ext = fileName.substr(fileName.lastIndexOf('.') + 1);
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'>