ASP.NET文本框LostFocus事件

本文介绍了ASP.NET文本框LostFocus事件的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我需要触发服务器端code被称为当一个TextBox失去焦点。

我知道有是的onblur客户端事件，没有LostFocus事件，所以我怎么可能会导致回发时，我的文本框失去焦点发生？

更新：

我已经找到了博客这似乎给了pretty体面的解决办法了这一点。它涉及添加自定义事件一个TextBox的子类，和注册这就要求在的onblur JavaScript客户端事件的服务器端事件的客户端脚本。

以下是我在VB中实现：

公共类MyTextBox    继承的TextBox    实现IPostBackEventHandler    受保护的覆盖子的OnInit（BYVAL E上System.EventArgs）        MyBase.OnInit（五）        如果不Page.ClientScript.IsClientScriptBlockRegistered（OnBlurTextBoxEvent），然后            Page.ClientScript.RegisterStartupScript（MyBase.GetType，OnBlurTextBoxEvent，getScript加入，真）            Attributes.Add（的onblur，OnBlurred（'与＆amp;的Un​​iqueID＆放大器;'，''））        万一    结束小组    公共委托子OnBlurDelegate（BYVAL发件人为对象，BYVAL E上的EventArgs）    公共事件模糊效果OnBlurDelegate    保护小组的onblur（）        模糊的RaiseEvent（ME，EventArgs.Empty）    结束小组    私有函数getScript加入（）作为字符串        返回功能OnBlurred（控制，ARG）与＆amp; vbCrLf＆安培; _                {＆放大器; vbCrLf＆安培; _                __doPostBack（控制，ARG）; ＆安培; vbCrLf＆安培; _                }    结束功能    公用Sub RaisePostBackEvent（BYVAL eventArgument作为字符串）实现System.Web.UI.IPostBackEventHandler.RaisePostBackEvent        的onblur（）    结束小组末级

解决方案

我已经找到了博客这似乎给了pretty体面的解决办法了这一点。它涉及添加自定义事件一个TextBox的子类，和注册这就要求在的onblur JavaScript客户端事件的服务器端事件的客户端脚本。

以下是我在VB中实现：

公共类MyTextBox    继承的TextBox    实现IPostBackEventHandler    受保护的覆盖子的OnInit（BYVAL E上System.EventArgs）        MyBase.OnInit（五）        如果不Page.ClientScript.IsClientScriptBlockRegistered（OnBlurTextBoxEvent），然后            Page.ClientScript.RegisterStartupScript（MyBase.GetType，OnBlurTextBoxEvent，getScript加入，真）            Attributes.Add（的onblur，OnBlurred（'与＆amp;的Un​​iqueID＆放大器;'，''））        万一    结束小组    公共委托子OnBlurDelegate（BYVAL发件人为对象，BYVAL E上的EventArgs）    公共事件模糊效果OnBlurDelegate    保护小组的onblur（）        模糊的RaiseEvent（ME，EventArgs.Empty）    结束小组    私有函数getScript加入（）作为字符串        返回功能OnBlurred（控制，ARG）与＆amp; vbCrLf＆安培; _                {＆放大器; vbCrLf＆安培; _                __doPostBack（控制，ARG）; ＆安培; vbCrLf＆安培; _                }    结束功能    公用Sub RaisePostBackEvent（BYVAL eventArgument作为字符串）实现System.Web.UI.IPostBackEventHandler.RaisePostBackEvent        的onblur（）    结束小组末级

I need to trigger code on the server side to be called when a TextBox loses focus.

I know there is the onblur client side event, and that there is no LostFocus event, so how can I cause a postback to occur when my TextBox loses focus?

Update:

I have found a blog which seems to give a pretty decent solution to this. It involves adding a custom event to a TextBox subclass, and registering a client script which calls the server-side event in the onblur JavaScript client event.

The following is my implementation in VB:

Public Class MyTextBox Inherits TextBox Implements IPostBackEventHandler Protected Overrides Sub OnInit(ByVal e As System.EventArgs) MyBase.OnInit(e) If Not Page.ClientScript.IsClientScriptBlockRegistered("OnBlurTextBoxEvent") Then Page.ClientScript.RegisterStartupScript(MyBase.GetType, "OnBlurTextBoxEvent", GetScript, True) Attributes.Add("onblur", "OnBlurred('" & UniqueID & "','')") End If End Sub Public Delegate Sub OnBlurDelegate(ByVal sender As Object, ByVal e As EventArgs) Public Event Blur As OnBlurDelegate Protected Sub OnBlur() RaiseEvent Blur(Me, EventArgs.Empty) End Sub Private Function GetScript() As String Return "function OnBlurred(control, arg)" & vbCrLf & _ "{" & vbCrLf & _ " __doPostBack(control, arg);" & vbCrLf & _ "}" End Function Public Sub RaisePostBackEvent(ByVal eventArgument As String) Implements System.Web.UI.IPostBackEventHandler.RaisePostBackEvent OnBlur() End Sub End Class

解决方案

I have found a blog which seems to give a pretty decent solution to this. It involves adding a custom event to a TextBox subclass, and registering a client script which calls the server-side event in the onblur JavaScript client event.

The following is my implementation in VB:

Public Class MyTextBox Inherits TextBox Implements IPostBackEventHandler Protected Overrides Sub OnInit(ByVal e As System.EventArgs) MyBase.OnInit(e) If Not Page.ClientScript.IsClientScriptBlockRegistered("OnBlurTextBoxEvent") Then Page.ClientScript.RegisterStartupScript(MyBase.GetType, "OnBlurTextBoxEvent", GetScript, True) Attributes.Add("onblur", "OnBlurred('" & UniqueID & "','')") End If End Sub Public Delegate Sub OnBlurDelegate(ByVal sender As Object, ByVal e As EventArgs) Public Event Blur As OnBlurDelegate Protected Sub OnBlur() RaiseEvent Blur(Me, EventArgs.Empty) End Sub Private Function GetScript() As String Return "function OnBlurred(control, arg)" & vbCrLf & _ "{" & vbCrLf & _ " __doPostBack(control, arg);" & vbCrLf & _ "}" End Function Public Sub RaisePostBackEvent(ByVal eventArgument As String) Implements System.Web.UI.IPostBackEventHandler.RaisePostBackEvent OnBlur() End Sub End Class