get folder directory from input type file - PHP

PHP Snippet 1:

<label> Update to  : </label>
<input type="file" class="form-control" id="dirpath" name="dirpath" directory onSubmit = getPath()/>

<script language="javascript" type="text/javascript">
function getPath() {
     var inputName = document.getElementById('dirname');
     var Path;

     Path = inputName.value;
}
</script>