ASP.NET TextBox LostFocus事件

当TextBox失去焦点时,我需要在服务器端触发代码.

我知道有onblur客户端事件,并且没有LostFocus事件,所以当TextBox失去焦点时,如何才能导致回发？

更新：

我发现blog似乎给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,并注册在onblur JavaScript客户端事件中调用服务器端事件的客户端脚本.

以下是我在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

解决方法

以下是我在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,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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