How to find gridview then textboxes inside the gridview and then fetch the value from each textbox

<script type="text/javascript">
       function EnableHODBox() {
           alert('hello');
           var GridView = document.getElementById('<%=gvScheduling.ClientID %>');
           //var GridViews = GridView.rows.length;

          // alert(GridViews);
           var DeptId;
           if (GridView.rows.length > 0) {
               for (Row = 1; Row < GridView.rows.length; Row++) {

                   var ti1 = GridView.getElementsByTagName('tIn1');
                   var t=ti1.item;
                   alert(t);
               }
           }
       }
</script>