网页在ADSL上网状态下刷新太慢 ,会不会因为有4个DropDownList的影响
我这个网页,如果用户是光纤,倒刷新速度还可以的,但是用户假如是ADSL的话,就明显慢了,对此我加入了ajax技术,但是依然慢, 不知道是不是因为网页上有4个DropDownList的影响.请大家帮忙看一下,如何修改,会快一点
前台代码如下:
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Qcount.aspx.cs" Inherits="Qc_Qcount" %>
<%@ Register src="../WebUserControl.ascx" tagname="WebUserControl" tagprefix="uc1" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>大客户产品检验状况统计</title>
<style type="text/css">
.style3
{
text-align: center;
font-size: x-large;
}
</style>
</head>
<body>
<form id="form1" runat="server">
<uc1:WebUserControl ID="WebUserControl1" runat="server" />
<div>
</div>
<div class="style3">
大客户产品检验状况统计</div>
<div>
</div>
<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
<div>
<asp:UpdateProgress ID="UpdateProgress1" runat="server">
<ProgressTemplate>
正在操作中,请稍候
</ProgressTemplate>
</asp:UpdateProgress>
<br />
<asp:Button ID="AB" runat="server" onclick="AB_Click" Text="新建"
Width="79px" />
<asp:Button ID="AC" runat="server" Text="删除"
Width="79px" onclick="AC_Click" onclientclick="return confirm('是/否')" />
</div>
<div>
<asp:Label ID="labid" runat="server"></asp:Label>
<asp:Label ID="Label1" runat="server" Text="*日期"></asp:Label>
<asp:TextBox ID="txtga51" runat="server" Width="77px"></asp:TextBox>
<asp:Label ID="Label2" runat="server" Text="*加工点"></asp:Label>
<asp:DropDownList ID="txtga02" runat="server"
style="margin-top: 0px" Width="124px" AutoPostBack="True" onselectedindexchanged="txtga02_SelectedIndexChanged"
>
</asp:DropDownList>
<asp:Label ID="Label6" runat="server" Text="*流水线"></asp:Label>
<asp:DropDownList ID="txtga03" runat="server"
style="margin-top: 0px" Width="150px"
>
</asp:DropDownList>
<asp:Label ID="Label3" runat="server" Text="*产品"></asp:Label>
<asp:DropDownList ID="txtga01" runat="server"
Width="124px" AutoPostBack="True"
onselectedindexchanged="txtga01_SelectedIndexChanged">
</asp:DropDownList>
<asp:Label ID="Label4" runat="server" Text="*生产数量"></asp:Label>
<asp:TextBox ID="txtga91" runat="server" Width="114px"></asp:TextBox>
</div>
<asp:Label ID="Label5" runat="server" Text="检验工序"></asp:Label>
<asp:DropDownList ID="txtgb01" runat="server" AutoPostBack="True" Width="141px"
onselectedindexchanged="txtgb01_SelectedIndexChanged">
</asp:DropDownList>
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False"
Height="133px" onrowediting="GridView1_RowEditing"
onrowupdating="GridView1_RowUpdating" DataKeyNames="ID,gb01,gb02,gb03"
onrowcancelingedit="GridView1_RowCancelingEdit">
<Columns>
<asp:BoundField HeaderText="不良项目" DataField="gb04" />
<asp:BoundField HeaderText="不良数量" DataField="gb92" />
<asp:BoundField HeaderText="填写人" DataField="CreatePerson" />
<asp:BoundField HeaderText="填写时间" DataField="CreatePersonDate" />
<asp:CommandField ShowEditButton="True" />
</Columns>
</asp:GridView>
</ContentTemplate>
</asp:UpdatePanel>
</form>
</body>
</html>
后台代码如下:
public partial class Qc_Qcount : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
droplisttext();//下拉框的值
Maticsoft.Model.AYONGHU mma = (Maticsoft.Model.AYONGHU)Session["ayonghu"];
ViewState["name"] = mma.NAME;
}
}
private void droplisttext()//改变下拉框的值
{
//求得下拉框的参数
Maticsoft.BLL.Apm bll = new Maticsoft.BLL.Apm();
DataTable idt;
idt = bll.GetAllList().Tables[0];
ViewState["dt"] = idt;
//加工点
DataView dv1 = new DataView(idt);
dv1.RowFilter = ("parentcode='35'");
txtga02.DataSource = dv1;
txtga02.DataTextField = "cinvcname";
txtga02.DataValueField = "no";
txtga02.DataBind();
txtga02.Items.Insert(0, new ListItem("", ""));
txtga02.SelectedIndex = 0;
//产品
DataView dv2 = new DataView(idt);
dv2.RowFilter = ("parentcode='3001'");
txtga01.DataSource = dv2;
txtga01.DataTextField = "cinvcname";
txtga01.DataValueField = "no";
txtga01.DataBind();
//添加产品空白项
this.txtga01.Items.Insert(0, new ListItem("", ""));
this.txtga01.SelectedIndex = 0;
this.txtgb01.Items.Insert(0, new ListItem("", ""));
this.txtgb01.SelectedIndex = 0;
}
protected void txtga01_SelectedIndexChanged(object sender, EventArgs e)//产品选择框
{
string ga51 = txtga51.Text.Trim();
string ga01value = txtga01.SelectedValue.ToString();
string ga02value = txtga02.SelectedValue.ToString();
string ga03value = txtga03.SelectedValue.ToString();
//确认该记录是否已经存在有的话就返回值,
//先做好参数
SqlParameter[] parameters = {
new SqlParameter("@ga01", SqlDbType.VarChar,250),
new SqlParameter("@ga02", SqlDbType.VarChar,250),
new SqlParameter("@ga03", SqlDbType.VarChar,250),
new SqlParameter("@ga51", SqlDbType.DateTime)};
parameters[0].Value = ga01value;
parameters[1].Value = ga02value;
parameters[2].Value = ga03value;
parameters[3].Value = ga51;
//执行存储过程
SqlDataReader sReader = Maticsoft.DBUtility.DbHelperSQL.RunProcedure("Qcountifinsert", parameters);
sReader.Read();
labid.Text = sReader[0].ToString();//对ID赋值
txtga91.Text = sReader[1].ToString(); //对数量赋值,如果已经存在,就会直接显示
sReader.Close();
//生成产品
DataTable dt = (DataTable)ViewState["dt"];
DataView dv2 = new DataView(dt);
dv2.RowFilter = ("parentcode='" + txtga01.SelectedValue.ToString() + "'");
txtgb01.DataSource = dv2;
txtgb01.DataTextField = "cinvcname";
txtgb01.DataValueField = "no";
txtgb01.DataBind();
//添加工序空白项
this.txtgb01.Items.Insert(0, new ListItem("", ""));
this.txtgb01.SelectedIndex = 0;
}
protected void txtgb01_SelectedIndexChanged(object sender, EventArgs e)//检验工序选择
{
//判断必填项
if (ifempty())
{
return;
}
if (labid.Text.Length == 0)
{
MessageBox.Show(this, "ID号没有,无法生成记录");
return;
}
string qcountid = labid.Text;//获取主表id号
string gb01 = txtgb01.SelectedValue.ToString();//大工序编号
string gb02 = txtgb01.SelectedItem.Text;
//建立共用变量
ViewState["id"] = qcountid;
ViewState["gb01"] = gb01;
ViewState["gb02"] = gb02;
showdata();//获取数据源,刷新数据
}
protected void GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e)
{
}
protected void GridView1_RowEditing(object sender, GridViewEditEventArgs e)
{
GridView1.EditIndex = e.NewEditIndex;
showdata();
}
private void showdata()//刷新数据
{
SqlParameter[] parameters = {
new SqlParameter("@gb91", SqlDbType.Int),
new SqlParameter("@gb01", SqlDbType.VarChar,250),
new SqlParameter("@gb02", SqlDbType.VarChar,250)};
parameters[0].Value = int.Parse(ViewState["id"].ToString());
parameters[1].Value = ViewState["gb01"].ToString();
parameters[2].Value = ViewState["gb02"].ToString();
//执行存储过程
DataSet ds = Maticsoft.DBUtility.DbHelperSQL.RunProcedure("Qcountbinsert", parameters, "Qcountb");
GridView1.DataSource = ds.Tables["Qcountb"].DefaultView;
GridView1.DataBind();
}
protected void GridView1_RowCancelingEdit(object sender, GridViewCancelEditEventArgs e)
{
GridView1.EditIndex = -1;
showdata();
}
protected void txtga02_SelectedIndexChanged(object sender, EventArgs e)
{
//流水线
DataView dv2 = new DataView((DataTable)ViewState["dt"]);
dv2.RowFilter = ("parentcode='" + txtga02.SelectedValue.ToString() + "'");
txtga03.DataSource = dv2;
txtga03.DataTextField = "cinvcname";
txtga03.DataValueField = "no";
txtga03.DataBind();
}
protected void AC_Click(object sender, EventArgs e)//删除
{
}
}
[解决办法]
UpdatePanel与刷新整个页面的速度是一样的，因为机制就是回发，而不是纯粹基于前端javascript的ajax机制。
如果想开发用户体验好的网页应用，使用真正的前端ajax代码，或者silverlight等RIA机制。不论哪一种方式，都是纯粹地访问后台服务，而不是一遍遍去刷新页面（更不是去进行根本不需要的数据库查询操作），当然快啦。
[解决办法]
