1.__doPostBack("id","")方法 2.GetPostBackEventReference方法作用 3.客户端如何触发服务器端控件的事件 右边提供程序用此方法实现在客户端单击按钮后,禁用此按钮,直到程序运行完毕再开启按钮。(单击右边下载) 下面再举个小例子. 前台页面 有个服务器控件 <asp:Button id="Button1" runat="server" Text="Button"></asp:Button> 一个客户端控件用来触发服务器端 <a href="#" onclick="document.getElementById('Button1').click()">触发服务器端按钮事件</a> (2) 利用GetPostBackEventReference给客户端生成__doPostBack() 前台 <a href="#" onclick="<%=PostBack()%>">触发服务器端按钮事件</a> 后台 protected string PostBack() { return this.Page.GetPostBackEventReference(this.Button1,"haha"); } 通过__EVENTARGUMENT="haha"可以判断是不是点了那个链接的PostBack 把Button1的按钮事件这么写: if(Request["__EVENTARGUMENT" ]=="haha") { Response.Write("这个是链接的PostBack"); } else { Response.Write("这个不是链接的PostBack"); } 以下这个是微软MSDN上的例子: public class MyControl : Control, IPostBackEventHandler { // Create an integer property that is displayed when // the page that contains this control is requested // and save it to the control's ViewState property. public int Number { get { if ( ViewState["Number"] !=null ) return (int) ViewState["Number"]; return 50; } set { ViewState["Number"] = value; } } // Implement the RaisePostBackEvent method from the // IPostBackEventHandler interface. If 'inc' is passed // to this method, it increases the Number property by one. // If 'dec' is passed to this method, it decreases the // Number property by one. public void RaisePostBackEvent(string eventArgument) { if ( eventArgument == "inc" ) Number = Number + 1; if ( eventArgument == "dec" ) Number = Number - 1; } [System.Security.Permissions.PermissionSet(System.Security.Permissions.SecurityAction.Demand, Name="FullTrust")] protected override void Render(HtmlTextWriter writer) { // Converts the Number property to a string and // writes it to the containing page. writer.Write("The Number is " + Number.ToString() + " (" ); // Uses the GetPostBackEventReference method to pass // 'inc' to the RaisePostBackEvent method when the link // this code creates is clicked. writer.Write("<a href=\"javascript:" + Page.GetPostBackEventReference(this,"inc") + "\">Increase Number</a>"); writer.Write(" or "); // Uses the GetPostBackEventReference method to pass // 'dec' to the RaisePostBackEvent method when the link // this code creates is clicked. writer.Write("<a href=\"javascript:" + Page.GetPostBackEventReference(this,"dec") + "\">Decrease Number</a>"); } }
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