Question : ClientScriptManager.RegisterForEventValidation

Ive been playing around with ASPx and decided to try and get a div to show when a user enters some data into a textfield, and hide when the focus is lost.

However I keep getting the following error message, and even thought Ive tried to use the ClientScript.RegisterForEventValidation("Textbox1_Blur") which tells me I need to do this in render but cant find the render event.

I know I can use the EnableEventValidation="false", however this removes the built in security which Id like to keep if possible.

The error message I get is:-

Invalid postback or callback argument.  Event validation is enabled using <pages enableEventValidation="true"/> in configuration or <%@ Page EnableEventValidation="true" %> in a page.  For security purposes, this feature verifies that arguments to postback or callback events originate from the server control that originally rendered them.  If the data is valid and expected, use the ClientScriptManager.RegisterForEventValidation method in order to register the postback or callback data for validation.

Any ideas how I can prevent the error, but keep the security on?

Thanks in advance


ASPx Code:-

<%@ Page Title="Home Page" Language="vb" MasterPageFile="~/Site.Master" AutoEventWireup="false"
    CodeBehind="Default.aspx.vb" Inherits="WebApplication21._Default" %>

<asp:Content ID="HeaderContent" runat="server" ContentPlaceHolderID="HeadContent">
</asp:Content>
<asp:Content ID="BodyContent" runat="server" ContentPlaceHolderID="MainContent">
    <asp:ScriptManager ID="ScriptManager1" runat="server">
    </asp:ScriptManager>

    <asp:UpdatePanel ID="UpdatePanel1" runat="server">
        <ContentTemplate>
            <div id="divTextBox1_AutoComplete" runat="server" style="border: thin solid #000000; background-color: #00FFFF; position: absolute; z-index: auto; visibility: hidden">
                Hello this is a test<br/>
                This is a second line<br/>
                This is third
            </div>
            <asp:TextBox id="Textbox1" runat="server" />
            <asp:Button id="Textbox1_Blur" runat="server" Visible="false" />
            <asp:Button id="Textbox1_KeyUp" runat="server" Visible="false" />
        </ContentTemplate>
    </asp:UpdatePanel>    
</asp:Content>

VB Code:-

Public Class _Default
    Inherits System.Web.UI.Page

    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load

        Textbox1.Attributes.Add("onBlur", ClientScript.GetPostBackEventReference(Me.Textbox1_Blur, ""))
        Textbox1.Attributes.Add("onKeyUp", ClientScript.GetPostBackEventReference(Me.Textbox1_KeyUp, ""))
        'ClientScript.RegisterForEventValidation("Textbox1_Blur")
        'ClientScript.RegisterForEventValidation("Textbox1_KeyUp")
    End Sub

    Private Sub Textbox1_Blur_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Textbox1_Blur.Click
        divTextBox1_AutoComplete.Attributes("display") = "none"
    End Sub

    Private Sub Textbox1_KeyUp_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Textbox1_KeyUp.Click
        divTextBox1_AutoComplete.Attributes("display") = "inline"
    End Sub
End Class

Answer : ClientScriptManager.RegisterForEventValidation

Hi,

yes, there is an Office spreadsheet ActiveX control which can be embedded into a form. It's a kind of "light" Excel and can be programmed. Another possibility would be to embed an Excel object with the unbound object control - or even better, let it done in a real Excel instead of complicate embed methods.

But the best method of course would be to directly enter the data into the table, you could for example use a datasheet view which is similar to a spreadsheet. You could create a temporary table where no restrictions are on the fields so the user can move between all cells and enter data and then in the end you can simply walk through the records and columns and check all the data to write it to the real table. Would be very much easier than exchanging the data with Excel.

Cheers,

Christian