ASP.NET TextBox LostFocus事件

Question

当TextBox失去焦点时,我需要在服务器端触发代码.

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

更新:

我找到了一个博客,似乎给出了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

Answer 1

我发现一个博客似乎对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