Restrict file upload by extension on html input tags

gistfile1.js

// HTML
// <input type="file" data-allowed-files="pdf|jpeg"/>

$('#file').on('change', function(e){
var types = new RegExp('(\\.)('+ $(e.target).data('allowed-files') + ')$', 'i');
  if(!types.test(this.value)
     alert('not allowed');
     this.value='';
  }
  
});