AJAX:ASP.NET服务端的文本处理实例 -

javascript-ajax/" target="_blank">Ajax数据格式中文本处理方式是较简单的一种，说它简单是因为它的处理是返回整个文本的内容，而如XML的处理就稍有复杂了。

在实际应用中text处理很常见，像KFC优惠网的"我的优惠券"就是。

思路分析:将每个优惠券数据绑定后通过list控件遍历出来，然后将id做为querystring传给服务端来进行处理，服务端返回的数据格式是文本处理方式。

利用这个解决问题的办法下面我们需要做购物车的功能，采用AJAX技术实现的实例。首先是点击"加入购物车"的代码部分:

＜button onclick='addShopcart("getShopcart.aspx?id=")'＞加入购物车＜/button＞
＜div id="results"＞＜/div＞

接下来是javascript的request对象的核心代码部分:

document.getElementById('results').innerHTML = request.responseText;

注:这儿的 request 对象为《AJAX：XHR的入门》中的 req。

这行的意思是：往id名为results的div容器中加服务端响应客户端请求的文本内容。那么，服务端的代码如下：

protected void Page_Load(object sender, EvertArgs e)
{
    int id = int.Parse(request.QueryString["id"].ToString());
    DataTable shopcartTable = DBAccess.GetShopcart(id);
    //然后是处理数据的程序内容(略)
}

这回调的文本内容如同是一个页面中的某一部分的内容。这样，实现了AJAX技术即异步回调技术。

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