ExtJs ajax request, json and masking

<%-- MASKING AJAX --%>
<script type="text/javascript">
  var maskingAjax = new Ext.data.Connection({
    listeners: {
      beforerequest: {
        fn: function (con, opt) {
          Ext.get(document.body).mask('Loading...')
        },
        scope: this
      },
      requestcomplete: {
        fn: function (con, res, opt) {
          Ext.get(document.body).unmask()
        },
        scope: this
      },
      requestexception: {
        fn: function (con, res, opt) {
          Ext.get(document.body).unmask()
        },
        scope: this
      }
    }
  })
</script>

<%-- GET RABOTA.UA COMPANY INFO --%>
<script type="text/javascript">
  function getCompanyInfo(id) {
    maskingAjax.request({
      url: '<%= ResolveUrl("~/json/NotebookCompanyInfo/read.ashx")%>',
      failure: function () {
        alert('err')
      },
      success: function (r, o) {
        var company = Ext.decode(r.responseText)
        alert('all ok') //reloadDRStore();
      },
      params: { NotebookId: id }
    })
  }
</script>