ASP.NET OnTextChanged无法从更新面板内部触发 [英] ASP.NET OnTextChanged not firing from inside an update panel

问题描述

我正在使用ASP.NET更新面板使用文本框上的TextChanged检索用户信息，这是我的代码:

I am using an ASP.NET update panel to retrieve user info using the on TextChanged for the textbox, here is my code:

<asp:UpdatePanel runat="server" ID="up1" ChildrenAsTriggers="true">
<ContentTemplate>
    <asp:TextBox runat="server" ID="loginEmail" Text="Email" 
        CssClass="textBoxes" OnTextChanged="userInfo" AutoPostBack="true"></asp:TextBox>
</ContentTemplate>
<Triggers>
    <asp:AsyncPostBackTrigger ControlID="loginEmail" EventName="TextChanged" />
</Triggers>
</asp:UpdatePanel>

及其背后的代码:

string url, emailInfo;
emailInfo = loginEmail.Text;
url = Membership.GetUserNameByEmail(emailInfo);

emailText.InnerText = "Email: " + emailInfo;
urlText.InnerText = "Webiste: http://www.Elwazefa.com/User/" + url ; 

代码不会在文本更改后触发，但可以， 在ButtonClick或PageLoad上.

the code wont fire on textchanged but it wil, on ButtonClick or PageLoad.

出什么问题了?

使用ASP.NET 4.0

Using ASP.NET 4.0

推荐答案

<asp:TextBox AutoPostBack="true" OnTextChanged="thingId_TextChanged" ID="thingId" runat="server"></asp:TextBox>

AutoPostBack 当焦点从文本框中丢失时，文本框将触发回发. TextChanged事件将在任何后续回发中触发(可能是由于单击按钮或文本框焦点更改).所以你需要确定

AutoPostBack on text-box will trigger post-back when the focus is lost from the text box. TextChanged event will be fired on any subsequent post-back (can be due to button-click or text box focus change). So you need to make certain

1. 更改文本后，您将移出文本框
2. 您要更改的所有控件都是更新面板的一部分(可以是其他更新面板).如果没有任何更新面板的一部分，那么这些更改将不会反映在客户端上.

我的猜测是您可能正在遭受#2的困扰.您可以使用诸如Fiddler(或FireFox上的Firebug)之类的工具来检查当文本框失去焦点时浏览器是否正在触发AJAX(XHR)请求.

My guess is you are probably suffering from #2. You can use tool such as Fiddler (or Firebug on FireFox) to check if browser is firing AJAX (XHR) request when the focus is lost from the text-box.

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