关于数据返回给调用页面

我们经常需要将数据返回给调用页面，下面是基本实现方式。

假设，有两个页子selectdate.aspx,calendar.aspx.

需要在selectdate.aspx做个连接，点击后打开calendar.aspx，然后在calendar.aspx中选择日期，将选择的日期返回给

selectdate.aspx（呵呵，不知道我说明白没有）

算了，看看代码吧，自然就明白了。

对了，还需要个文件用来装JAVASCRIPT的script.js

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selectdate.aspx

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<%@ Page language="c#" Codebehind="detail.aspx.cs" AutoEventWireup="false" Inherits="calendar.detail" %>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >

<HTML>

<HEAD>

<title>detail</title>

</HEAD>

<body>

<asp:TextBox id="CompletionDate" style="Z-INDEX: 101; LEFT: 120px; POSITION: absolute; TOP: 72px"

runat="server"></asp:TextBox>

<A href="javascript:OpenCalendar('CompletionDate', true)"><IMG style="Z-INDEX: 102; LEFT: 296px; WIDTH: 24px; POSITION: absolute; TOP: 72px; HEIGHT: 16px"

height="16" alt="" src="img/calendar.gif" width="24"></A>

</form>

</body>

</HTML>

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selectdate.aspx.cs

----------------------------------------------------------------------

sing System;

using System.Collections;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Web;

using System.Web.SessionState;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Web.UI.HtmlControls;

namespace calendar

{

/// <summary>

/// detail 的摘要说明。

/// </summary>

public class detail : System.Web.UI.Page

{

protected System.Web.UI.WebControls.TextBox CompletionDate;

private void Page_Load(object sender, System.EventArgs e)

{

// 在此处放置用户代码以初始化页面

}

#region Web 窗体设计器生成的代码

override protected void OnInit(EventArgs e)

{

// CODEGEN: 该调用是 ASP.NET Web 窗体设计器所必需的。

InitializeComponent();

base.OnInit(e);

}

/// <summary>

/// 设计器支持所需的方法 - 不要使用代码编辑器修改

/// 此方法的内容。

/// </summary>

private void InitializeComponent()

{

this.Load += new System.EventHandler(this.Page_Load);

}

#endregion

}

===========================================================================

calendar.aspx

=========================================================================

<%@ Page language="c#" Codebehind="calendar.aspx.cs" AutoEventWireup="false" Inherits="calendar.WebForm1" %>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >

<HTML>

<HEAD>

<title>WebForm1</title>

function CloseWindow()

{

self.close();

}

</script>

</HEAD>

<body>

<asp:Calendar id="Cal" style="Z-INDEX: 101; LEFT: 96px; POSITION: absolute; TOP: 16px" runat="server"

BorderWidth="1px" BackColor="#FFFFCC" Width="220px" DayNameFormat="FirstLetter" ForeColor="#663399"

Height="200px" Font-Size="8pt" Font-Names="Verdana" BorderColor="#FFCC66" ShowGridLines="True">

</asp:Calendar>

<asp:Button id="OKButton" style="Z-INDEX: 102; LEFT: 96px; POSITION: absolute; TOP: 224px" runat="server"

Text="O k"></asp:Button>

<asp:Button id="CancelButton" style="Z-INDEX: 103; LEFT: 136px; POSITION: absolute; TOP: 224px"

runat="server" Text="Cancel"></asp:Button>

</a>

<asp:Label id="lblDate" style="Z-INDEX: 104; LEFT: 216px; POSITION: absolute; TOP: 232px" runat="server"></asp:Label>

<asp:DropDownList id="MonthSelect" style="Z-INDEX: 105; LEFT: 96px; POSITION: absolute; TOP: 256px"

runat="server" AutoPostBack="True"></asp:DropDownList>

<asp:DropDownList id="YearSelect" style="Z-INDEX: 106; LEFT: 248px; POSITION: absolute; TOP: 256px"

runat="server" AutoPostBack="True"></asp:DropDownList>

<input id="datechosen" type="hidden" name="datechosen" runat="server"> //这个很重要

</form>

</body>

</HTML>

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calendar.aspx.cs

--------------------------------------------------------------------------------------------------------------------------

using System;

using System.Collections;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Web;

using System.Web.SessionState;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Web.UI.HtmlControls;

using System.Configuration;

namespace calendar

{

/// <summary>

/// WebForm1 的摘要说明。

/// </summary>

public class WebForm1 : System.Web.UI.Page

{

protected System.Web.UI.WebControls.Calendar Cal;

protected System.Web.UI.WebControls.Button OKButton;

protected System.Web.UI.WebControls.Button CancelButton;

protected System.Web.UI.WebControls.Label lblDate;

protected System.Web.UI.WebControls.DropDownList MonthSelect;

protected System.Web.UI.HtmlControls.HtmlInputHidden datechosen;

protected System.Web.UI.WebControls.DropDownList YearSelect;

private void Page_Load(object sender, System.EventArgs e)

{

if (!Page.IsPostBack)

{

string selected = Request.QueryString["selected"];

string id = Request.QueryString["id"];

string form = Request.QueryString["formname"];

string postBack = Request.QueryString["postBack"];

Cal.FirstDayOfWeek = (System.Web.UI.WebControls.FirstDayOfWeek)1;//(System.Web.UI.WebControls.FirstDayOfWeek)Convert.ToInt32(ConfigurationSettings.AppSettings[Global.CfgKeyFirstDayOfWeek]);

try

{

Cal.SelectedDate = Cal.VisibleDate = Convert.ToDateTime(selected);

}

catch

{

Cal.SelectedDate = Cal.VisibleDate = DateTime.Today;

}

FillCalendarChoices();

SelectCorrectValues();

OKButton.Attributes.Add("onClick", "window.opener.SetDate('" + form + "','" + id + "', document.Calendar.datechosen.value," + postBack + ");");

CancelButton.Attributes.Add("onClick", "CloseWindow()");

}// 在此处放置用户代码以初始化页面

}

private void FillCalendarChoices()

{

DateTime thisdate = new DateTime(DateTime.Today.Year,1,1);

for (int x=0; x<12; x++)

{

ListItem li = new ListItem(thisdate.ToString("MMMM"), thisdate.Month.ToString());

MonthSelect.Items.Add(li);

thisdate = thisdate.AddMonths(1);

}

for (int y=1994; y <= thisdate.Year; y++)

{

YearSelect.Items.Add(y.ToString());

}

private void SelectCorrectValues()

{

lblDate.Text = Cal.SelectedDate.ToShortDateString();

datechosen.Value = lblDate.Text;

MonthSelect.SelectedIndex = MonthSelect.Items.IndexOf(MonthSelect.Items.FindByValue(Cal.SelectedDate.Month.ToString()));

YearSelect.SelectedIndex = YearSelect.Items.IndexOf(YearSelect.Items.FindByValue(Cal.SelectedDate.Year.ToString()));

}

private void Cal_SelectionChanged(object sender, System.EventArgs e)

{

Cal.VisibleDate = Cal.SelectedDate;

SelectCorrectValues();

}

private void MonthSelect_SelectedIndexChanged(object sender, System.EventArgs e)

{

Cal.SelectedDate = Cal.VisibleDate

= new DateTime(Convert.ToInt32(YearSelect.SelectedItem.Value),

Convert.ToInt32(MonthSelect.SelectedItem.Value), 1);;

SelectCorrectValues();

}

private void YearSelect_SelectedIndexChanged(object sender, System.EventArgs e)

{

Cal.SelectedDate = Cal.VisibleDate

= new DateTime(Convert.ToInt32(YearSelect.SelectedItem.Value),

Convert.ToInt32(MonthSelect.SelectedItem.Value), 1);;

SelectCorrectValues();

}

#region Web 窗体设计器生成的代码

override protected void OnInit(EventArgs e)

{

// CODEGEN: 该调用是 ASP.NET Web 窗体设计器所必需的。

InitializeComponent();

base.OnInit(e);

}

/// <summary>

/// 设计器支持所需的方法 - 不要使用代码编辑器修改

/// 此方法的内容。

/// </summary>

private void InitializeComponent()

{

this.Cal.SelectionChanged += new System.EventHandler(this.Cal_SelectionChanged);

//this.OKButton.Click += new System.EventHandler(this.OKButton_Click);

//this.CancelButton.Click += new System.EventHandler(this.CancelButton_Click);

this.MonthSelect.SelectedIndexChanged += new System.EventHandler(this.MonthSelect_SelectedIndexChanged);

this.YearSelect.SelectedIndexChanged += new System.EventHandler(this.YearSelect_SelectedIndexChanged);

this.Load += new System.EventHandler(this.Page_Load);

this.ID = "Calendar";

}

#endregion

private void CancelButton_Click(object sender, System.EventArgs e)

{

}

private void OKButton_Click(object sender, System.EventArgs e)

{

}

==========================================================================================

script.js

===================================================================================

var popUp;

function OpenCalendar(idname, postBack)

{

popUp = window.open('Calendar.aspx?formname=' + document.forms[0].name +

'&id=' + idname + '&selected=' + document.forms[0].elements[idname].value + '&postBack=' + postBack,

'popupcal',

'width=285,height=420,left=200,top=250');

}

function SetDate(formName, id, newDate, postBack)

{

eval('var theform = document.' + formName + ';');

popUp.close();

theform.elements[id].value = newDate;

if (postBack)

__doPostBack(id,'');

}

=============================================================================