ASP.NET 文本框 LostFocus 事件
我需要在文本框失去焦点时触发服务器端的代码。
我知道有 onblur 客户端事件，并且没有 LostFocus 事件，那么当我的 TextBox 失去焦点时如何导致回发发生？
更新：
我发现了blog 这似乎为此提供了一个相当不错的解决方案。它涉及向 TextBox 子类添加自定义事件，并注册一个在 onblur JavaScript 客户端事件中调用服务器端事件的客户端脚本。
下面是我在VB中的实现：
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
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
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评论（4）
我发现了 博客 这似乎为此提供了一个相当不错的解决方案。它涉及向 TextBox 子类添加自定义事件，并注册一个在 onblur JavaScript 客户端事件中调用服务器端事件的客户端脚本。
下面是我在VB中的实现：
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:
谢谢你，它就像一个魅力。您只需更改一件事：将传递给 OnBlurred 函数的 UniqueID 值用引号引起来，因此它用作字符串而不是控件实例。即：
变为：
Thanks for that, it works like a charm. Just one thing you need to change: wrap the UniqueID value passed to the OnBlurred function in quotes, so it is used as a string and not the control instance. That is:
becomes:
嗯，这是一个相当奇怪的计划，但是您可以在客户端使用“onblur”来调用“form.submit();”。
Well, it's a fairly odd plan, but you can use 'onblur' on the client side to call 'form.submit();'.
为什么不使用 asp 文本框并将 AutoPostBack 属性设置为 true。
Why don't you use asp textbox with AutoPostBack property set to true.