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将div做成服务器控件并添加单击事件

2010-08-07 11:33 393 查看

根据基础的asp.net知识，写个demo:
HTML code

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>

<!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></title>
</head>
<body>
<form id="form1" runat="server">
<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
<asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional">
<ContentTemplate>
<div runat="server" id="myDiv">
click me
</div>
</ContentTemplate>
</asp:UpdatePanel>
</form>
</body>
</html>

C# code

using System;
using System.Web.UI;

public partial class _Default : System.Web.UI.Page, IPostBackEventHandler
{
protected void Page_Load(object sender, EventArgs e)
{
this.myDiv.Attributes["onclick"] = this.Page.ClientScript.GetPostBackEventReference(this.Page,"点击myDiv");
}

public void RaisePostBackEvent(string eventArgument)
{
if (eventArgument == "点击myDiv")
ScriptManager.RegisterStartupScript(this, this.GetType(), this.GetHashCode().ToString(),
"alert('点击了myDiv');", true);
}
}

举一个“更好地封装”的例子。给某个asp.net组件添加click事件就将这个行为封装到一个ascx中去！

HTML code

<%@ Control Language="C#" AutoEventWireup="true" CodeFile="WebUserControl.ascx.cs"
Inherits="WebUserControl" %>

C# code

using System;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;

public partial class WebUserControl : System.Web.UI.UserControl, IPostBackEventHandler
{

public string TargetID { get; set; }

public event EventHandler<EventArgs> Click;

public void RaisePostBackEvent(string eventArgument)
{
if (this.Click != null)
this.Click(this, EventArgs.Empty);
}

protected void Page_PreRender(object sender, EventArgs e)
{
var ctl = this.Parent.FindControl(this.TargetID);
var script = this.Page.ClientScript.GetPostBackEventReference(this, string.Empty);
if (ctl is HtmlControl)
((HtmlContainerControl)ctl).Attributes["onclick"] = script;
else if (ctl is WebControl)
((WebControl)ctl).Attributes["onclick"] = script;
else if(ctl is WebUserControl)
((WebUserControl)ctl).Attributes["onclick"] = script;
}
}

这个ascx是实现上面说的那个接口的，也就是说它要把回发引导它自己。然后，有一个TargetID属性你可以用于设置它要控制的组件的ID。当它工作时，它向TargetID标记出的控件注入（attach）一个客户端onclick事件，当客户在页面上点击那个控件时，这个ascx的Click事件就被触发了！

还是用前面的demo，这回要写的代码简单多了，只要把这个ascx用鼠标拖入要控制的控件的旁边放下，声明两个属性：

HTML code

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>

<%@ 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></title>
</head>
<body>
<form id="form1" runat="server">
<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
<asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional">
<ContentTemplate>
<div runat="server" id="myDiv">
click me
</div>
<uc1:WebUserControl ID="WebUserControl1" runat="server" TargetID="myDiv" OnClick="myDiv_Clicked" />
</ContentTemplate>
</asp:UpdatePanel>
</form>
</body>
</html>

C# code

using System;
using System.Web.UI;

public partial class _Default : System.Web.UI.Page
{
protected void myDiv_Clicked(object sender, EventArgs e)
{
ScriptManager.RegisterStartupScript(this, this.GetType(), this.GetHashCode().ToString(),
"alert('点击了myDiv');", true);
}
}

如果你需要控制哪一个控件为它加上单击事件，就把这个“单击”行为工具拖到它的旁边放下，然后简单地设置一下TargetID属性和click事件就行了。

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