我可以触发从下拉列表中选择一个更新面板中用户控件 [英] Can I trigger an Update Panel from a Drop Down list in a User Control
问题描述
我有两个下拉列表中的一个母版页的用户控件。当用户选择一个项目进行任何的DDL，我要加载的内容网页上的更新面板内的特定用户的控制。我无法弄清楚如何获得用户控件来触发更新面板。任何建议都非常AP preciated。
主
＆LT;％@注册SRC =toolbar.ascx变量名=工具栏标签preFIX =UC1％GT;
＆LT;头ID =头像1=服务器＆GT;
＆LT; /头＆GT;
＆LT;身体GT;
＆LT;表ID =form1的=服务器＆GT;
＆LT; DIV＆GT;
＆LT; ASP：ToolkitScriptManager ID =ToolkitScriptManager1=服务器＆GT;
＆LT; / ASP：ToolkitScriptManager＆GT;
＆LT; / DIV＆GT;
＆LT; UC1：工具栏ID =toolbar1=服务器/＆GT;
＆LT; ASP：的ContentPlaceHolder ID =ContentPlaceHolder1=服务器＆GT;
＆LT; / ASP：＆的ContentPlaceHolder GT;
＆LT; /表及GT;
＆LT; /身体GT;
＆LT; / HTML＆GT;
用户控制
＆LT;％@控制语言=C＃AutoEventWireup =真codeBehind =toolbar.ascx.cs继承=Blah.toolbar％GT;
＆LT; ASP：DropDownList的ID =ddlDesiredPage=服务器的AutoPostBack =真
的EnableViewState =真
onselectedindexchanged =goToSelectedPage＆GT;
＆LT; ASP：ListItem的值= - ＆GT; DDL 1 LT; / ASP：ListItem的＆GT;
＆LT; / ASP：DropDownList的＆GT;
＆安培; NBSP;
＆LT; ASP：DropDownList的ID =ddlDesiredPageSP=服务器的AutoPostBack =真
的EnableViewState =真
onselectedindexchanged =goToSelectedPage＆GT;
＆LT; ASP：ListItem的值= - ＆GT; DDL 2'; / ASP：ListItem的＆GT;
＆LT; / ASP：DropDownList的＆GT;
内容页
＆LT; ASP：内容ID =内容1ContentPlaceHolderID =ContentPlaceHolder1=服务器＆GT;
＆LT; ASP：的UpdatePanel ID =UpdatePanel1=服务器的onload =UpdatePanel1_Load＆GT;
＆LT;＆的ContentTemplate GT;
＆LT; ASP：占位符ID =PLACEHOLDER1=服务器＆GT;＆LT; / ASP：占位符＆GT;
＆LT; /＆的ContentTemplate GT;
＆LT;＆触发器GT;
?????????????????????????????????
＆LT; /触发器＆GT;
＆LT; / ASP：的UpdatePanel＆GT;
＆LT; / ASP：内容＆GT;
如果您想更新通过您所创建的用户控制面板，你可以尝试设置在UpdatePanel的的UpdateMode =条件。然后，在你的用户控件的Click事件（或任何事件），有这样的事情：
的UpdatePanel mUpdatePanel = this.Page.Master.FindControl（upContent）作为UpdatePanel的;
如果（mUpdatePanel！= NULL）
{
mUpdatePanel.Update（）;
}
其他
{
//更新面板未找到
}
更新
既然你不能声明访问您的触发器，你可以从code-后面添加它们。在您的内容页面，添加如下内容：
AsyncPostBackTrigger triggerUserControl =新AsyncPostBackTrigger（）;
DropDownList的ucDDL = this.Page.Master.FindControl（ddlDesiredPage）作为DropDownList的;
triggerUserControl.ControlID = ucDDL.ID;
triggerUserControl.EventName =点击 UpdatePanel1.Triggers.Add（triggerUserControl）;
执行相同的其他DropDownList的。我没有试过，但它似乎是合理的。
I have a user control in a master page with two drop down lists. When the user selects an item out of either ddl, I want to load a specific user control inside an update panel on the content page. I can't figure out how to get the user control to trigger the update panel. Any suggestions are very much appreciated.
Master
<%@ Register src="toolbar.ascx" tagname="toolbar" tagprefix="uc1" %>
<head id="Head1" runat="server">
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:ToolkitScriptManager ID="ToolkitScriptManager1" runat="server">
</asp:ToolkitScriptManager>
</div>
<uc1:toolbar ID="toolbar1" runat="server" />
<asp:ContentPlaceHolder ID="ContentPlaceHolder1" runat="server">
</asp:ContentPlaceHolder>
</form>
</body>
</html>
User Control
<%@ Control Language="C#" AutoEventWireup="true" CodeBehind="toolbar.ascx.cs" Inherits="Blah.toolbar" %>
<asp:DropDownList ID="ddlDesiredPage" runat="server" AutoPostBack="True"
EnableViewState="True"
onselectedindexchanged="goToSelectedPage">
<asp:ListItem Value="-">DDL 1</asp:ListItem>
</asp:DropDownList>
<asp:DropDownList ID="ddlDesiredPageSP" runat="server" AutoPostBack="True"
EnableViewState="True"
onselectedindexchanged="goToSelectedPage">
<asp:ListItem Value="-">DDL 2</asp:ListItem>
</asp:DropDownList>
Content Page
<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" runat="server">
<asp:UpdatePanel ID="UpdatePanel1" runat="server" onload="UpdatePanel1_Load">
<ContentTemplate>
<asp:PlaceHolder ID="PlaceHolder1" runat="server"></asp:PlaceHolder>
</ContentTemplate>
<Triggers>
?????????????????????????????????
</Triggers>
</asp:UpdatePanel>
</asp:Content>
If you want to update the panel via the User Control you've created, you could try setting the UpdatePanel's UpdateMode = Conditional. Then, in your User Control's click event (or whichever event), have something like this:
UpdatePanel mUpdatePanel = this.Page.Master.FindControl("upContent") as UpdatePanel;
if (mUpdatePanel != null)
{
mUpdatePanel.Update();
}
else
{
//update panel not found
}
UPDATE
Since you can't access your triggers declaratively, you could add them from the code-behind. On your content page, add something like this:
AsyncPostBackTrigger triggerUserControl = new AsyncPostBackTrigger();
DropDownList ucDDL = this.Page.Master.FindControl("ddlDesiredPage") as DropDownList;
triggerUserControl.ControlID = ucDDL.ID;
triggerUserControl.EventName = "Click";
UpdatePanel1.Triggers.Add(triggerUserControl);
Do the same for the other DropDownList. I haven't tried this, but it seems reasonable.
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