Allow only pdf, doc, docx format for file upload?

Question

I am triggering a file upload on href click.
I am trying to block all extension except doc, docx and pdf.
I am not getting the correct alert value.

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Answer 1

$('#surat_lampiran').bind('change', function() {
  alerr = "";
  sts = false;
  alert(this.files[0].type);
  if(this.files[0].type != "application/pdf" && this.files[0].type != "application/msword" && this.files[0].type != "application/vnd.openxmlformats-officedocument.wordprocessingml.document"){
  sts = true;
  alerr += "Jenis file bukan .pdf/.doc/.docx ";
}
});