ext paging.js 分页时的调用的写法。

paging.js，分页时的调用的写法。

js 代码

Ext.onReady(function(){

    // create the Data Store
    var ds = new Ext.data.Store({
        // load using script tags for cross domain, if the data in on the same domain as
        // this page, an HttpProxy would be better
        proxy: new Ext.data.ScriptTagProxy({
            url: 'http://extjs.com/forum/topics-remote.php'
        }),

        // create reader that reads the Topic records
        reader: new Ext.data.JsonReader({
            root: 'topics',
            totalProperty: 'totalCount',
            id: 'post_id'
        }, [
            {name: 'title', mapping: 'topic_title'},
            {name: 'author', mapping: 'author'},
            {name: 'totalPosts', mapping: 'topic_replies', type: 'int'},
            {name: 'lastPost', mapping: 'post_time', type: 'date', dateFormat: 'timestamp'},
            {name: 'excerpt', mapping: 'post_text'}
        ]),

        // turn on remote sorting
        remoteSort: true
    });


    // pluggable renders
    function renderTopic(value, p, record){
        return String.format('<b>{0}</b>{1}', value, record.data['excerpt']);
    }
    function renderTopicPlain(value){
        return String.format('<b><i>{0}</i></b>', value);
    }
    function renderLast(value, p, r){
        return String.format('{0}<br/>by {1}', value.dateFormat('M j, Y, g:i a'), r.data['author']);
    }
    function renderLastPlain(value){
        return value.dateFormat('M j, Y, g:i a');
    }

    // the column model has information about grid columns
    // dataIndex maps the column to the specific data field in
    // the data store
    var cm = new Ext.grid.ColumnModel([{
           id: 'topic', // id assigned so we can apply custom css (e.g. .x-grid-col-topic b { color:#333 })
           header: "Topic",
           dataIndex: 'title',
           width: 490,
           renderer: renderTopic,
           css: 'white-space:normal;'
        },{
           header: "Author",
           dataIndex: 'author',
           width: 100,
           hidden: true //    隐藏列
        },{
           id: 'last',
           header: "Last Post",
           dataIndex: 'lastPost',
           width: 150,
           renderer: renderLast
        }]);



    // create the editor grid
    var grid = new Ext.grid.Grid('topic-grid', {
        ds: ds,
        cm: cm,
        selModel: new Ext.grid.RowSelectionModel({singleSelect:true}),
        enableColLock:false,
        loadMask: true //是否显示正在加载
    });

    // make the grid resizable, do before render for better performance
    var rz = new Ext.Resizable('topic-grid', {
        wrap:true,
        minHeight:100,
        pinned:true,
        handles: 's'
    });
    rz.on('resize', grid.autoSize, grid);

    // render it
    grid.render();

    var gridFoot = grid.getView().getFooterPanel(true);

    // 在grid底部增加分页按钮
    var paging = new Ext.PagingToolbar(gridFoot, ds, {
        pageSize: 25,
        displayInfo: true,
        displayMsg: 'Displaying topics {0} - {1} of {2}',
        emptyMsg: "No topics to display"
    });
    // 增加可以查看详细信息的按钮
    paging.add('-', {
        pressed: true,
        enableToggle:true,
        text: 'Detailed View',
        cls: 'x-btn-text-icon details',
        toggleHandler: toggleDetails
    });

  // trigger the data store load
    // ds.load({params:{start:0, limit:5}, extraParams:{dept:'test', viaParam:true}});

     //ds.load({params:{start:0, limit:5, department:'test', viaPara:true}});

     //ds.load({params:{start:0, limit:5}});



     //查询时需要用到的参数

    // ds.on('beforeload', function() {

    //       ds.baseParams = {

    //         dept: 'test111',

     //        viaParam: true

     //      };

     //    });

    // 传入start和limit参数以初始化数据
    ds.load({params:{start:0, limit:25}});

    function toggleDetails(btn, pressed){
        cm.getColumnById('topic').renderer = pressed ? renderTopic : renderTopicPlain;
        cm.getColumnById('last').renderer = pressed ? renderLast : renderLastPlain;
        grid.getView().refresh();
    }
});

Grid的分页必须依靠服务端（Server Side）来划分好每一页的数据才可以完成。

本例中的服务端语言是PHP,数据库是MySQL，用来导出一些随机的数据。下列脚本的作用是，获取我们想要的数据，同时这些数据是已分好页的数据。分页的参数是由Page Toolbar传入的变量limit和start所决定的。
例如： http://extjs.com/forum/topics-remote.php?start=0&limit=1 

php 代码

$link = mysql_pconnect("test-db.vinylfox.com", "test", "testuser")
    or die("Could not connect");
mysql_select_db("test") or die("Could not select database");

$sql_count = "SELECT id, name, title, hire_date, active FROM random_employee_data";
$sql = $sql_count . " LIMIT ".$_GET['start'].", ".$_GET['limit'];

$rs_count = mysql_query($sql_count);

$rows = mysql_num_rows($rs_count);

$rs = mysql_query($sql);

while($obj = mysql_fetch_object($rs))
{
    $arr[] = $obj;
}

Echo $_GET['callback'].'({"total":"'.$rows.'","results":'.json_encode($arr).'})';

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