我們經常要在程序的人機交互中用到模態窗口,但在B/S開發中,這一切變得不容易了,雖然也可以用window.showModalDialog函數實現(見http://dotnet.aspx.cc/ShowDetail.aspx?id=49ML4AO8-5PB3-4KNY-NJZD-LJOIOXV4M1X4),但多數用起來麻煩,還要為了回傳值用Frameset建立2個無用的窗口。不爽! 我發現可以嘗試在初始頁面中嵌入一個IFRAME,然后用IFRAME來顯示一個頁面,并將IFRAME設定為按絕對位置擺放,Z-Index設置為最高的9999,這樣就可以將這個頁面覆蓋在初始界面上,當需要顯示模態窗口時,就顯示這個IFRAME,可以將IFRAME的尺寸擴大到能覆蓋住初始窗口,也可以蓋住關鍵項,目的就是不讓后面的窗口有什么變化的可能。在IFRAME顯示的窗口需要關閉時只要對它的parent的IFRAME隱藏就可以了。實際試驗時發現IFRAME的diaplay不能在子窗口被改變,所以,我們還需要將IFRAME放到一個DIV中,控制DIV的顯示就可以控制窗口的出現或隱藏。但為什么不直接用DIV來顯示窗口呢,原因有兩個:1.DIV不能遮擋它后面的Dropdownlist控件,而IFRAME能。2.不容易將窗口內的內容放置到一個單獨的網頁中,復用性差。 以下是代碼,顯示隱藏使用了客戶端和服務端代碼兩種寫法: WebForm1.aspx <%@ Page language="c#" Codebehind="WebForm1.aspx.cs" AutoEventWireup="false" Inherits="WSGUI1.WebForm1" %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" > <HTML> <HEAD> <title>WebForm1</title> <meta name="GENERATOR" Content="Microsoft Visual Studio .NET 7.1"> <meta name="CODE_LANGUAGE" Content="C#"> <meta name="vs_defaultClientScript" content="JavaScript"> <meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5"> <script language="javascript"> function ShowLayer() { document.all.MyFormLayer.style.display=''; return false; } function SetURL(url) { document.all.IFRAME1.src=url; } </script> </HEAD> <body MS_POSITIONING="GridLayout"> <form id="Form1" method="post" runat="server"> <FONT face="宋體"> <asp:DropDownList id="DropDownList1" style="Z-INDEX: 101; LEFT: 40px; POSITION: absolute; TOP: 208px" runat="server" Width="184px"> <asp:ListItem Value="TEST1">q</asp:ListItem> <asp:ListItem Value="TEST2">w</asp:ListItem> <asp:ListItem Value="TEST3">e</asp:ListItem> <asp:ListItem Value="TEST4">r</asp:ListItem> </asp:DropDownList></FONT> <input type="button" name="MyButton" value="TEST" id="MyButton" onclick="ShowLayer();SetURL('WebForm2.aspx')" style="Z-INDEX: 102; LEFT: 360px; POSITION: absolute; TOP: 336px"> <div id="MyFormLayer" style="DISPLAY: none;Z-INDEX: 103;LEFT: 16px;WIDTH: 408px;POSITION: absolute;TOP: 24px;HEIGHT: 304px"> <iframe scrolling="no" frameborder="0" width="100%" height="100%" id="IFRAME1" runat="server"> </iframe> </div> <asp:Button id="Button2" style="Z-INDEX: 104; LEFT: 256px; POSITION: absolute; TOP: 336px" runat="server" Text="ASPXTest"></asp:Button> </form> </body> </HTML> WebForm1.aspx.cs .... public class WebForm1 : System.Web.UI.Page { protected System.Web.UI.WebControls.DropDownList DropDownList1; protected System.Web.UI.HtmlControls.HtmlGenericControl IFRAME1; protected System.Web.UI.WebControls.Button Button2; private void Page_Load(object sender, System.EventArgs e) { // 在此處放置用戶代碼以初始化頁面 if(!IsPostBack) { } } public static void CreateScript(System.Web.UI.Page mypage,string strScript,string ID) { string strscript="<script language='javascript'>"; strscript += strScript; strscript += "</script>"; if(!mypage.IsStartupScriptRegistered(ID)) mypage.RegisterStartupScript(ID, strscript); } private void Button2_Click(object sender, System.EventArgs e) { IFRAME1.Attributes.Add("src","WebForm2.aspx?NAME='中國'"); CreateScript(Page,"ShowLayer();","SHOW"); } } WebForm2.aspx
<%@ Page language="c#" Codebehind="WebForm2.aspx.cs" AutoEventWireup="false" Inherits="WSGUI1.WebForm2" %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" > <HTML> <HEAD> <title>WebForm2</title> <meta name="GENERATOR" Content="Microsoft Visual Studio .NET 7.1"> <meta name="CODE_LANGUAGE" Content="C#"> <meta name="vs_defaultClientScript" content="JavaScript"> <meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5"> <script language="javascript"> function hide() { parent.MyFormLayer.style.display = "none"; } </script> </HEAD> <body MS_POSITIONING="GridLayout"> <form id="Form2" method="post" runat="server"> <table border="0" width="100%" cellspacing="0" cellpadding="0" bgcolor="#6887bb" height="100%" id="table1" style="BORDER-TOP-STYLE: outset; BORDER-RIGHT-STYLE: outset; BORDER-LEFT-STYLE: outset; BORDER-BOTTOM-STYLE: outset"> <tr> <td> </td> <td> </td> <td> </td> </tr> <tr> <td> </td> <td> <p align="center"><font color="#ffffff">模仿模態窗口效果</font></p> <p align="center"><input type="button" onclick="hide()" style="WIDTH: 80px" value="點擊關閉"> <asp:Button id="Button1" runat="server" Text="ASPXTest"></asp:Button></p> </td> <td> </td> </tr> <tr> <td> </td> <td> </td> <td> </td> </tr> </table> </form> </body> </HTML> WebFom2.aspx.cs namespace WSGUI1 { /// <summary> /// WebForm2 的摘要說明。 /// </summary> public class WebForm2 : System.Web.UI.Page { protected System.Web.UI.WebControls.Button Button1; private void Page_Load(object sender, System.EventArgs e) { // 在此處放置用戶代碼以初始化頁面 if(!IsPostBack) { Button1.Attributes.Add("onclick","hide()"); } } }
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