title: jqGrid datatype fybction
body: <p>When I using datatype: function, and try to check page number, every string of code incrementing page number:</p>
  
  <pre><code>                datatype: function (postdata) {
                  alert(postdata.page); //1
                  alert(postdata.page); //2
                  var t = 1;
                  alert(postdata.page); //3
              }
  </code></pre>
  
  <p>What does ot means? How get page number in this datatype?</p>