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POASP.NET TextBox LostFocus event
primarykey
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1310902
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1311866
AnswerCount
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ClosedDate
CommentCount
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CommunityOwnedDate
CreationDate
2009-08-21T09:18:40.697
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2010-07-12T12:22:57.220
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2010-07-12T12:22:57.220
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Score
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ViewCount
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text
Body
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 <a href="http://sbiefeld.com/2008/09/17/extending-the-aspnet-textbox-to-have-an-onblur-server-side-event/" rel="nofollow noreferrer">blog</a> 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: <pre><code>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 </code></pre>
Tags
<asp.net><textbox><lost-focus><custom-event>
Title
ASP.NET TextBox LostFocus event
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PostAcceptedAnswerId
1. PO
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 PTAnswer
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1. USPatrick McDonald
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1. USPatrick McDonald
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 POASP.NET TextBox LostFocus event
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