Get Textarea Cursor Position in AngularJs

This question boils down to needing to get the cursor position of a <textarea> element in a directive. In short, all I need to work in this.

var position = element.selectionStart;

There are at least 5 answers on the subject using various methods, e.g. this one for angular, this one for some jQuery extension, enter link description here.

I have read them all and decided to just try to get the selection start object. Here is my PLNKR. I have no idea what I am doing wrong. Note - the background change stuff is to see whether or not I am selecting the right element, which I am. Edit here is a snippet of the code that fails:

      link: function(scope, elem, attrs) {
          var textArea = elem.find("#itemTextArea");
          textArea.bind('click', function() {
              //This gets to undefined, even though selectionStart is a property of textarea*
              scope.testValue = elem.selectionStart;
          });
      },

*https://developer.mozilla.org/en-US/docs/Mozilla/Tech/XUL/Property/selectionStart

P.S. Click on text area to immediately know what's happening in directive.

The syntax you are looking for is:

scope.testValue = textArea.prop("selectionStart");