当 TextBox 失去焦点时,我需要在服务器端触发要调用的代码。
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:
我找到了一个博客,它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,并在 onblur JavaScript 客户端事件中注册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