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使用EXT实现无刷新动态调用股票信息

2008-11-01 00:00 706 查看

说句老实话，我目前还对Ext技术不是很熟，所以写的代码自己也觉得怪怪的，有什么不对的地方，还望赐教。
使用的Ext版本是ext-2.2，下载地址为：http://www.extjs.com/products/extjs/download.php
下载Ext JS 2.2 SDK,解压后拷贝resources文件夹至工作目录。
在resources文件夹下新建jscript文件夹，并拷贝ext根目录下ext-all.js文件及adapter\ext\ext-base.js文件至jscript文件夹下，并新建stock.js文件，代码如下:

function ajaxRequest(){ 
Ext.Ajax.request({ 
url: 'http://hq.sinajs.cn/list=sh000001,sh601939,sh600016,sh600528,sh600667,sh601390,sh601398,sh601857,sh600028,', 
success: function(response){ 
var stocks = response.responseText.split(';'); 
var length = stocks.length - 2; 
var dataset = new Array(length); 
for(var i=0; i<length; i++){ 
var content = stocks[i]; 
var temp1 = content.split('=')[0]; 
var temp2 = content.split('=')[1]; 
var code = temp1.substr(temp1.length - 6, 6); 
var temp3 = temp2.replace('"', ''); 
var name = temp3.split(',')[0]; 
var tday_f = temp3.split(',')[1]; 
var yest_f = temp3.split(',')[2]; 
var curr_f = temp3.split(',')[3]; 
var temp_f = curr_f - yest_f; 
var data_i = new Array(9); 
data_i[0] = code; 
data_i[1] = name; 
data_i[2] = curr_f; 
data_i[3] = tday_f; 
data_i[4] = yest_f; 
data_i[5] = temp_f.toFixed(2); 
data_i[6] = ((temp_f / yest_f) * 100).toFixed(2); 
data_i[7] = temp3.split(',')[4]; 
data_i[8] = temp3.split(',')[5]; 
dataset[i] = data_i; 
} 
var store = new Ext.data.SimpleStore({ 
fields: [ 
{name: 'a1'}, 
{name: 'a2'}, 
{name: 'a3'}, 
{name: 'a4'}, 
{name: 'a5'}, 
{name: 'a6'}, 
{name: 'a7'}, 
{name: 'a8'}, 
{name: 'a9'} 
] 
}); 
//store.loadData(dataset); 
var grid = new Ext.grid.GridPanel({ 
//renderTo: document.body, 
store: store, 
columns: [ 
{header: "股票代号", width: 100, sortable: true, dataIndex: 'a1', id:'a1'}, 
{header: "股票名称", width: 100, sortable: true, dataIndex: 'a2'}, 
{header: "当前价格", width: 100, sortable: true, dataIndex: 'a3'}, 
{header: "今日开盘", width: 100, sortable: true, dataIndex: 'a4'}, 
{header: "昨日收盘", width: 100, sortable: true, dataIndex: 'a5'}, 
{header: "当前差价", width: 100, sortable: true, dataIndex: 'a6', renderer: change}, 
{header: "涨跌幅度", width: 100, sortable: true, dataIndex: 'a7', renderer: change}, 
{header: "最高价格", width: 100, sortable: true, dataIndex: 'a8'}, 
{header: "最低价格", width: 100, sortable: true, dataIndex: 'a9'} 
], 
stripeRows: true, 
autoExpandColumn: 'a1', 
height:240, 
width:740, 
title:'股票信息一览' 
}); 
if(document.getElementById("stockgrid").innerHTML == ""){ 
grid.render('stockgrid'); 
grid.getSelectionModel().selectFirstRow(); 
} 
grid.store.loadData(dataset); 
} 
}); 
} 
function change(val){ 
if(val < 0){ 
return '<span style="color:green;">' + val + '</span>'; 
}else if(val > 0){ 
return '<span style="color:red;">' + val + '</span>'; 
} 
return val; 
} 
Ext.onReady(function(){ 
//修正页面启动时提示下载http://extjs.com/s.gif的问题 
Ext.BLANK_IMAGE_URL = "resources/images/default/s.gif"; 
Ext.state.Manager.setProvider(new Ext.state.CookieProvider()); 
ajaxRequest(); 
window.setInterval("ajaxRequest()",3000); 
});

在工作目录下新建stock.html文件，代码如下：

<html> 
<head> 
<meta http-equiv="Content-Type" content="text/html; charset=gbk"> 
<title>股票信息</title> 
<link rel="stylesheet" type="text/css" href="resources/css/ext-all.css" /> 
<script type="text/javascript" src="resources/jscript/ext-base.js"></script> 
<script type="text/javascript" src="resources/jscript/ext-all.js"></script> 
<script type="text/javascript" src="resources/jscript/stock.js"></script> 
</head> 
<body> 
<div id="stockgrid"></div> 
</body> 
</html>

从这里可以看到，使用Ext技术，动态页面从页面表现层到数据取得全部都交由Ext来处理。

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