<!DOCTYPE html>
<html>
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=Edge"/>
    <script src="https://ajax.aspnetcdn.com/ajax/jquery/jquery-1.9.0.min.js"></script>
    <script src="https://appsforoffice.microsoft.com/lib/1.0/hosted/office.js"></script>
    <script>
    Office.initialize = function (reason) {
      $('#outData').val('BBBBBB');
      $(document).ready(function () {
        $('#execbtn').click(function(){
          $('#outData').val('BBBBBB')
   Office.context.document.getSelectedDataAsync(Office.CoercionType.Text, function (asyncResult) {
       if (asyncResult.status == Office.AsyncResultStatus.Failed) {
           $('#outData').val('Action failed. Error: ' + asyncResult.error.message);
       }
       else {
           $('#outData').val(asyncResult.value);
       }
   });
        });
      });
    };
    </script>
  </head>
  <body>
    <div style="font-weight:bold">選択内容取得</div>
    <p>
    選択内容を取得します</p>
    <div>
      選択内容:
      <input type="text" id="outData" value="AAAAA" /><br />
      <input type="button" id="execbtn" value="Execute !" />
    </div>
  </body>
</html>