Re: onchange event not working in combination with requiredfieldvalidator control

tomgrillo — Tue, 13 May 2008 21:04:32 GMT

Thanks a lot!

Re: onchange event not working in combination with requiredfieldvalidator control

dits59 — Fri, 09 May 2008 13:40:17 GMT

use document.getElementById instead of getElementById

onchange event not working in combination with requiredfieldvalidator control

tomgrillo — Fri, 09 May 2008 11:48:47 GMT

Hi,

I need some help. Below a simple testpage with a texbox a button and an image. What I want to achieve is to change the src of the image (id=imgImage) whenever the content of the textbox (id=txtBox) is changed. Very basic stuff ... I've added a javascript function (on page load, see below) to add a javascript command to the 'onchange' event of the textbox and it's working fine.

However, when I add a requiredfieldvalidator to that same textbox it's not working anymore. I've been looking for a solution but can't seem to find what's wrong!! I'm sure it has to do with the additional javascript the requiredfieldvalidator is generating but I don't know what. If I change the javascript to a simple alert command it works (with the requiredfieldvalidator) but changing the src property only works without the requiredfieldvalidator ....

Any help would be very appriciated.

<%@ Page Language="VB" AutoEventWireup="false" CodeFile="Validation.aspx.vb" Inherits="Validation" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<title>Untitled Page</title>

</head>

<body>

<div>

<asp:Image runat="server" ID="imgImage" ImageUrl="~/bullet.gif" />

<asp:TextBox runat="server" ID="txtBox" />

<asp:RequiredFieldValidator runat="server" ID="rqvVal" ControlToValidate="txtBox"

ErrorMessage="Invalid!" />

<asp:Button runat="server" ID="btnButton" Text="Dummy" />

</div>

</form>

</body>

</html>

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

Dim strJava As String

strJava = "javascript:getElementById('" + [imgImage].ClientID + "').src='tips.gif';"

[txtBox].Attributes.Add("onchange", strJava)

End Sub

Client Side Web Development

Re: onchange event not working in combination with requiredfieldvalidator control

Re: onchange event not working in combination with requiredfieldvalidator control

onchange event not working in combination with requiredfieldvalidator control