页面刷新的各种问题
页面刷新之后出现的几个问题：
1. 按F5按钮会弹出“不重新发送信息，则无法显示网页”的提示框；
2. 前台页面有两个按钮，一个是点击后会将查询数据库数据显示在gridview；一个是点击后会将查询数据显示在文本框。按F5刷新后，这两个控件显示内容都不会重置，仍然显示查询后数据；
3. 如果点击了gridview的第二页，此时按F5刷新仍然会显示第二页。。

崩溃中。。

后台代码：

public partial class freightList : System.Web.UI.Page
{ 
       
   
    protected void Page_Load(object sender, EventArgs e)
    {
        
        
        if (!IsPostBack)
       {
           Session["searchSql"] = null;
           
        }
       
            bindFreight();
        

       
    }

    protected void bindFreight()
    {
        
        string sql = "select * from cargo";
        gvFreight.DataSource = dataOperate.getDataset(sql, "cargo");   //调用getDataset方法将返回值绑定到GridView上
        
        gvFreight.DataBind();                                               
    }

    protected void gvFreight_PageIndexChanging(object sender, GridViewPageEventArgs e)
    {
       
            string sql;
            sql = Convert.ToString(Session["searchSql"]);
            if (Session["searchSql"] == null)
            {
                gvFreight.PageIndex = e.NewPageIndex;
                gvFreight.DataBind();
            }
            else
            {
                gvFreight.DataSource = dataOperate.getDataset(sql, "cargo");   //调用getDataset方法将返回值绑定到GridView上
                gvFreight.PageIndex = e.NewPageIndex;
                gvFreight.DataBind();
            }
        
    }
    protected void Button3_Click(object sender, EventArgs e)
    {
        string table ="cargo";
        string keyType1 = "ID";
        string keyType2 = "terminal";
        string keyType3 = "date";
        string keyType4 = "trainNumber";
        string key1 = orderID.Text;
        string key2 = terminal.Text;
        string key3 = leaveDate.Text;
        string key4 = trainNumber.Text;
        string sql;
        if (key1 != "" || key2 != "" || key3 != "" || key4 != "")
        {
            sql = "select * from " + table + " where " + keyType1 + " like '%" + key1 + "%' and " + keyType2 + " like '%" + key2 + "%' and " + keyType3 + " like '%" + key3 + "%' and " + keyType4 + " like '%" + key4 + "%'";//
            Session["searchSql"] = sql; 
 
            
            
            gvFreight.DataSource = dataOperate.getDataset(sql, "cargo");   //调用getDataset方法将返回值绑定到GridView上
            gvFreight.DataBind();
          
            //Session["searchType"] = ddlSearchType.SelectedValue.ToString();
            
        }
        else
        {
            sql="";
            RegisterStartupScript("false", "<script>alert('请输入查询条件！')</script>"); 
        }

        
    }


    protected void Button4_Click(object sender, EventArgs e)
    {
        string surplus = " ";
        string sql;
        sql = "select ID from box where isEmpty <> 0";
        DataSet ds = dataOperate.getDataset(sql, "box");
        int i = 0;
        for (i = 0; i < ds.Tables[0].Rows.Count; i++)
        {
            surplus = surplus + "\r" + ds.Tables[0].Rows[i][0].ToString();
        }
        surplusBox.Text = surplus;
    }
}

前台：

<%@ Page Language="C#" MasterPageFile="~/MasterPage.master" AutoEventWireup="true" CodeFile="freightList.aspx.cs" Inherits="freightList" Title="货源信息" %>


<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">
                <table valign="center" align="center"  height="435"  cellpadding="0"  cellspacing="0" style="width: 960px">

                   
                    <tr  valign="top" align="center" bgcolor="#FFFFFF" style="height: 315px">
                        
                         <td>
                        
                                <%--<td align="right" style="width: 569px">--%>
            <asp:GridView ID="gvFreight" runat="server" AutoGenerateColumns="False" Width="960px" AllowPaging="True"  
                                         OnPageIndexChanging="gvFreight_PageIndexChanging" CssClass="huise1" 
                                         CellPadding="4" ForeColor="Black" GridLines="Vertical" 
                                    BackColor="White" BorderColor="#DEDFDE" BorderStyle="None" 
                                    BorderWidth="1px">
               
                    
               
                <AlternatingRowStyle BackColor="White" /> 
 
                <Columns>
                    <asp:BoundField DataField="ID" HeaderText="订单编号" />
                    <asp:BoundField DataField="trainNumber" HeaderText="车次" />
                    <asp:BoundField DataField="consignor" HeaderText="发货人" />
                    <asp:BoundField DataField="consignee" HeaderText="发收货人" />
                    <asp:BoundField DataField="start" HeaderText="出发地" />
                    <asp:BoundField DataField="terminal" HeaderText="到达地" />
                    <asp:BoundField DataField="price" HeaderText="货物运价" />
                    <asp:TemplateField HeaderText="重量(g)">
                        <ItemTemplate>
                            <%#Eval("weight") %>
                        </ItemTemplate>
                    </asp:TemplateField>
                    <asp:BoundField DataField="date" DataFormatString="{0:yyyy-MM-dd}" HeaderText="发布日期"
                        HtmlEncode="False" />
                    <asp:TemplateField HeaderText="详细信息">
                        <ItemTemplate>
                            <a href="#" onclick='openPWD("freightInfo.aspx?ID=<%#Eval("ID")%>",507,500)'>详细信息</a>
                        </ItemTemplate>
                    </asp:TemplateField>
                </Columns>
                
                
            </asp:GridView>
                        </td>
                    </tr>

                 <%--  <%#Eval("weight") %>--%>

                </table>
  <script language='javascript'>
    function openPWD(i,width,height)
   {
      window.showModalDialog(i,"","dialogHeight: "+height+"px; dialogWidth: "+width+"px;dialogTop:px; dialogLeft:px; edge: Raised; center: Yes; help: No; resizable: No; status: No;scroll:No");
  }
   


     </script>
</asp:Content>

字符数有限， 代码中显示文本框和按钮的部分被我删掉了。。 刷新 数据库
[解决办法]

引用:

Quote: 引用:

那这人家要按也没办法，一个查询的页面，如果要刷新数据，点击查询按钮不就可以了，为啥非要去F5。如果想做成按F5不弹出重复提交那你页面可以用AJAX去实现无刷新，再怎么按F5也不会重复提交了

详细点呗，或者教教我如何让他按F5无效

因为页面上有表单，必然刷新有提示的。这个不好解决。
1. 要不将页面使用ajax调用
2. 在页面上放一个 刷新 按钮。
[解决办法]
键盘F5的ascii码是116，你也可以写让F5无效，页面加载函数 if( window.event.keyCode==116){return;}
[解决办法]

引用:

Quote: 引用:

你可以用一个html页面，上面放一个 表单，弄个提交按钮，你试一试。

但是如何防止别人按F5呢

下面的方法可以吓唬吓唬用户

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
 <HEAD>
  <TITLE> New Document </TITLE>
  <META NAME="Generator" CONTENT="EditPlus">
  <META NAME="Author" CONTENT="">
  <META NAME="Keywords" CONTENT="">
  <META NAME="Description" CONTENT="">
 </HEAD>

 <BODY>
  <script>
window.onkeydown = function(e)
{
if(event.keyCode==116 ) 
{ 
alert("do not F5") 
event.returnValue = false;
event.preventDefault();
}
}
  </script>
 </BODY>
</HTML>