Use Ext.ux.grid.BufferView to hold the data

  

<!--
/*!
 * Ext JS Library 3.0.0
 * Copyright(c) 2006-2009 Ext JS, LLC
 * licensing@extjs.com
 * http://www.extjs.com/license
 */
-->
<html>
<head>
<title>Hello World Window</title>
<link rel="stylesheet" type="text/css" href="ext-3.0.0/resources/css/ext-all.css" />
<script type="text/javascript" src="ext-3.0.0/adapter/ext/ext-base.js"></script>
<script type="text/javascript" src="ext-3.0.0/ext-all.js"></script>
<script type="text/javascript" src="ext-3.0.0/examples/ux/BufferView.js"></script>
  <style type="text/css">
  .x-grid3-td-topic b {
      font-family:tahoma, verdana;
      display:block;
    overflow:hidden;
    width:98%;
    text-overflow:ellipsis;
  }
  .x-grid3-td-topic b i {
      font-weight:normal;
      font-style: normal;
      color:#000;
    overflow:hidden;
    text-overflow:ellipsis;
  }
  .x-grid3-td-topic .x-grid3-cell-inner {
      white-space: nowrap;
  }
  </style>
</head>

<!-- Revised from demo code in ext3.0.0 -->
<body>
<script type="text/javascript">
/*!
 * Ext JS Library 3.0.0
 * Copyright(c) 2006-2009 Ext JS, LLC
 * licensing@extjs.com
 * http://www.extjs.com/license
 */
Ext.onReady(function(){

    var store = new Ext.data.Store({
        remoteSort: true,
        baseParams: {lightWeight:true,ext: 'js'},
        sortInfo: {field:'lastpost', direction:'DESC'},
        autoLoad: {params:{start:0, limit:500}},

        proxy: new Ext.data.ScriptTagProxy({
            url: 'http://extjs.com/forum/topics-browse-remote.php'
        }),

        reader: new Ext.data.JsonReader({
            root: 'topics',
            totalProperty: 'totalCount',
            idProperty: 'threadid',
            fields: [
                'title', 'forumtitle', 'forumid', 'author',
                {name: 'replycount', type: 'int'},
                {name: 'lastpost', mapping: 'lastpost', type: 'date', dateFormat: 'timestamp'},
                'lastposter', 'excerpt'
            ]
        })
    });

    var grid = new Ext.grid.GridPanel({
        renderTo: 'topic-grid',
        width:700,
        height:500,
        frame:true,
        title:'ExtJS.com - Browse Forums',
        trackMouseOver:false,
    autoExpandColumn: 'topic',
        store: store,

        columns: [new Ext.grid.RowNumberer({width: 30}),{
            id: 'topic',
            header: "Topic",
            dataIndex: 'title',
            width: 420,
            renderer: renderTopic,
            sortable:true
        },{
            header: "Replies",
            dataIndex: 'replycount',
            width: 70,
            align: 'right',
            sortable:true
        },{
            id: 'last',
            header: "Last Post",
            dataIndex: 'lastpost',
            width: 150,
            renderer: renderLast,
            sortable:true
        }],

      bbar: new Ext.PagingToolbar({
        store: store,
        pageSize:500,
        displayInfo:true
      }),

      view: new Ext.ux.grid.BufferView({
        // custom row height
        rowHeight: 34,
        // render rows as they come into viewable area.
        scrollDelay: false
      })
    });


    // render functions
    function renderTopic(value, p, record){
        return String.format(
                '<b><a href="http://extjs.com/forum/showthread.php?t={2}" target="_blank">{0}</a></b><a href="http://extjs.com/forum/forumdisplay.php?f={3}" target="_blank">{1} Forum</a>',
                value, record.data.forumtitle, record.id, record.data.forumid);
    }
    function renderLast(value, p, r){
        return String.format('{0}<br/>by {1}', value.dateFormat('M j, Y, g:i a'), r.data['lastposter']);
    }

});


</script> 

<div id="topic-grid"></div>
</body>
</html>
Use Ext.ux.grid.BufferView to hold the data : BufferView « Ext JS « JavaScript DHTML

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