.NET Tutorials, Forums, Interview Questions And Answers
Welcome :Guest
Sign In
Register
 
Win Surprise Gifts!!!
Congratulations!!!


Top 5 Contributors of the Month
sivanagamahesh
Post New Web Links

ASP.NET validation controls are removing client event handlers.

Posted By:      Posted Date: November 29, 2010    Points: 0   Category :ASP.Net
 

 Below is a tiny section of code to highlight a problem that I am currently having. The textbox has an onblur event (the workings of the onblur event are irrelevant), and an associated RequiredFieldValidator. This code functions exactly as it should. However, if in the body onload event I simply raise an alert of the innerHTML of tr1 or td1, the onblur event does not appear (but it does work, and can be seen when I view source in IE7). If I remove the RequiredFieldValidator, the onblur event handler is shown in the alert, or if I retain the validator but change onblur to onfocus, then the event handler also appears in the alert. I need this to work as when the user increases the Quantity, duplicates of the table row are added (I have tried both cloneNode, and setting the innerHTML of each new table cell to that of the original, but as my alert proves, the onblur event handler is not included in what is copied). The same problem also occurs with onchange for select tags with validators. I am using Visual Studio 2008 (.Net 2), IE7 and IIS 7.

<tr id="tr1" /> 
  <td id="td1" />Quantity <input id="txtQuantity" onblur="fnBlur(this)" type="text" maxlength="2" value="1" runat="server" />   
 <asp:RequiredFieldValidator id="reqQuantity"


View Complete Post


More Related Resource Links

Adding client event handlers to an ASP.NET controls programmatically

  

Guys,

I want to add client event handlers to ASP.NET controls (For example: GridView/Button ) programmatically to ASP.NET.

I am aware of "onclick" event handler, so my code would be

GridView1.Attributes.Add("onclick", "JSGridViewFunction()");

Button1.Attributes.Add("onclick", "JSButtonFunction()");

I want to know what are all the event handlers that are available for (or that can be added to)  ASP.NET controls.

For example, I want to add "onsort" event handler to ASP.NET GridView control.

But the following code fails

GridView1.Attributes.Add("onsort", "JSGridViewFunction()");

Please help.

Thanks





Event receiver validation client message

  

Is thera a way to display a client message if validation sets. (java script or inline validation error message)

properties.Status = SPEventReceiverStatus.CancelWithError;

properties.Cancel =

 

true;

properties.ErrorMessage =

 

How to create event handlers for Composite Controls

  

Hi

How to create event handlers for Composite Controls. I have created a composite control with label, textbox and button. Like this

        public TextBox txt1 = new TextBox();
        public Label lbl1 = new Label();
        public Button btn1 = new Button();

protected override void CreateChildControls()
        {
            Controls.Add(lbl1);
            Controls.Add(txt1);
            Controls.Add(btn1);

base.CreateChildControls();

}

Now how to write the code once a event fires like text changed or click.

Regards

gsalunkhe


Get A Raise: Discover a Series of Fortunate Event Handlers in Visual Basic

  

You may use them every day, but how much do you really know about events? What's going on when you add an event handler to a class? In this article, Ken Getz demonstrates various ways to interact with events and event handlers, and shows how they can solve common problems. Along with the article, you can download two sample applications (one for Visual Basic .NET 2002 and 2003 and one for Visual Basic 2005) and follow along.

Ken Getz

MSDN Magazine June 2005


ASP.NET: Selectively Enable Form Validation When Using ASP.NET Web Controls

  

Sometimes the extra controls that come with Visual Studio .NET can be a bit inflexible or they just don't provide enough functionality or flexibility for all situations. The ASP.NET form validation controls, while powerful and easy to use, require that the entire page be valid before it's submitted back to the server. Through the use of the new object-oriented features of Visual Basic .NET, it is possible to extend their functionality to overcome this limitation. This article tells you how and helps you decide when it's a good idea to keep validation on the client and when you'd be better off disabling it.

James M. Venglarik II

MSDN Magazine April 2002


DHTML and .NET: Host Secure, Lightweight Client-Side Controls in Microsoft Internet Explorer

  

In the past, Web developers often used ActiveX controls if they wanted customized client-side functionality incorporated into their Web applications. Now, they can build objects supported by the Microsoft .NET Framework which are more compact, lightweight, secure, and seamlessly integrated. By hosting .NET Windows Forms controls in Internet Explorer, developers can realize many of their client-side Web development goals. This article adapts ActiveX concepts for use with Windows Forms, and builds a multifile upload application that demonstrates these techniques.

Jay Allen

MSDN Magazine January 2002


JQuery vs MS client validation

  

I have been trying both MicrosoftMvcJQueryValidation.js and MicrosoftMvcValidation.js.

The former does not support validation summarie, while the latter does.

Neither one of them seems to be able to deal with System.ComponentModel.DataAnnotations.DataType markings on the client side. It somewhat defeats the purpose of having the attributes on the server side. I know the validation on the server side works, but I need it to work on the client too.

Is there an easy way to make the client side validation for that work?

Are there any updates to these javascript libraries that I am may not be aware of?



Ajax Accordion to load data from client click event

  

I have a Ajax Accordion control on my page with treeview in Content Template. As the treeview for each pane are big. I am wondering whether I can load the treeview from codebehind only after the pane is selected. I can reuse the code from ItemDataBound of Accordion control.


Generated controls - skipping focus event - C# + JS

  

Ok, here is my senario.

A random (6-15) amount of textboxes are generated. Each textbox represents only one character. From those textboxes, three of them (at a random position) are enabled and the rest disabled.

Problem:

When I put a character in any enabled textbox, it must put the focus on the next enabled textbox.

Notes:

Textbox IDs go from 'char0' to 'char15' OR 'char0' to 'char12' OR ...

All the textboxes are generated so I can't set up specific focus events for each textbox because the designated control is unknown at design time.


Here is my attempt:

page.aspx

<script type="text/javascript">
    function abc(nextfocus)
    {
            document.getElementById(nextfocus).focus();
    }
</script>

page.aspx.cs

for (int i = 0; i < focusableControls.Length-1; i++)
{
focusableControls[i].ClientSideEvents.KeyDown = "abc(" + focusableControls[i + 1].ID + ")";
}

NOTE:

focusableControls is an array with all the textboxes in that can get focus. It is also in the right order.


Things I want to find out:

How will I send the textbox out of focus

Task Lists . Orphan Event Handlers

  

I wonder what are these empty event handlers that swarm in Task Lists with IDs 32767 ?

I think they can be a reason why my Announcements dont work from such lists. And wf dont autostart also (autostart on creation).


Client validation, scrollTo override...

  

Using VS2005 (.NET 2.0), VB code behind,

I have a page with several required field validators + validation summary control(s). As noted in this post - when the client side validation runs the page gets scrolled to the top (window.scrollTo(0,0)). To change this behavior I implemented the second suggested alternative - I placed the following code at the bottom of my page:

    <script type="text/javascript">
        //Redefine the the window.scrollTo during the ValidationSummaryOnSubmit execution to avoid
        //  having the page scroll to the top...
        //  adapted from:http://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?FeedbackID=299399
        var ValidationSummaryOnSubmitOrig = ValidationSummaryOnSubmit;
        var ValidationSummaryOnSubmit = function() {
            var scrollToOrig = window.scrollTo;
            window.scrollTo = function() {}; //override with todo nothing
            var validationGroup = null;
            if (arguments.length>0) { //check for optional parameter
                if (arguments[0]) {
                    validationGroup = arguments[0];
                }
            }
            ValidationSummaryOnSubmitOrig(v

sslstream client certificate validation error

  
Hi,I have taken server and client program from MSDN2 for sslstream. in that code client certifiacte authetication is made false  i want to enable that and do the code i have done some modification to the code but is giving error "RemoteCertificateNotAvailable" and i think that its not getting the client certificate at server side.So please can any one help me to do client server program using sslstream in which client certificate also needs to be validated.I am attaching my modified code of MSDN2Server sideusing System;using System.Collections;using System.Net;using System.Net.Sockets;using System.Net.Security;using System.Security.Authentication;using System.Text;using System.Security.Cryptography.X509Certificates;using System.IO;namespace Examples.System.Net{    public sealed class SslTcpServer     {        static X509Certificate serverCertificate = null;        // The certificate parameter specifies the name of the file         // containing the machine certificate.        // The following method is invoked by the RemoteCertificateValidationDelegate.        public static bool ValidateClientCertificate(              object sender,              X509Certificate certificate,              X509Chain chain,              SslPolicyErrors sslPolicyErrors)        {            SslPolicyErrors errors = sslPolicyErrors;            if (errors != SslPolicyErrors.None)            {

Validation Controls Inside UpdatePanel

  
Hi All,If you use validation control, the base validator will render script WebForm_OnSubmit() to the page and add form onsubmit "onsubmit="javascript:return WebForm_OnSubmit();". This script is used to fire client side validation event.Now I have a listview inside updatepanel, when click edit button to fire the listview edit mode, the above validation script is just not rendered. How shall I work around with that? I need to customize the client validation event here.Thanks.

how to apply validation controls on Gridview which is created dynamically

  
 hi, i created a gridview with two columns and 8 rows dynamically. All the rows are empty and editable at runtime. I am giving column names for this grid from some other .aspx page by passing column names using querystring.Because i am using this grid for three different pairs of column names.  i would like to know how to apply Required Field Validator, Regular Expression Validator  and Range Validator on Gridview textboxes. So that by using those validators i want to validate user inputs. And i would also like to know how to add rows at runtime for this grid. I am using ASP.net 2.0 and C#.net for this.(Visual Studio 2005) The code i am using to create gridview is below. <%@ Page Language="C#" AutoEventWireup="true" CodeFile="LoadData.aspx.cs" Inherits="LoadData" %>  <form id="form1" runat="server">  <div> <asp:GridView ID="GrdDynamic" runat="server" AutoGenerateColumns="False" ForeColor="#333333" BorderColor="GradientInactiveCaption" BorderStyle="Solid" style="z-index: 108; left: 24px; position: absolute; top: 13px">  <FooterStyle BackColor="#507CD1" Font-Bold="True" ForeColor="White" />  <RowStyle BackColor="#EFF3FB"

Client side hashing using ASP.NET Login Controls

  
I am using ASP.NET 3.5 and SQL Server 2005.currently while creating users, the password will be stored in the database using SHA256 algorithm. And in the Log In time entered password will be hashed with a salt and this salted password only transmitted through network (javascript). This is for incresing security without using SSL connection.I am planning to use ASP.NET 3.5 login controlsHow can I use client side hashing (SHA256 salted hashing) along with ASP.NET Login Controls. And also each login attempt should be logged, in a separate database table with IP address, user agent and so on.Any help would be greatly appreciated.

Event Handlers don't execute after restart from checkpoint

  
Hi,   I have OnPreExecute and OnPostExecute Event Handlers on the Package level for custom logging.  They fire on pre/post exec for every task in the package as I wish.  They don't fire however when the package is restarted from a checkfile.  FailPackageOnFailure is set to false for the event handlers and every task within them.  I thought this was how to prevent the task from being written to checkfile and in turn prevent the task from failing to execute after restart. Is it true there are no workarounds for this behaviour? Thanks, Josh

SPUtility.TransferToErrorPage("My Message") not allowed to attach any controls event.

  
Hi, I have created a custom error page and update it using to webApplication using following code: WebApplication.UpdateMappedPage(SPWebApplicaton.SPCustomPage.Error, CustomErrorPage) My error page contains one link button and onClick event, I have to perform some operations. As I click on the button Error is occurred and onClick event code didn't execute. If I render custom error page by providing url in IE like http://myweburl/_layouts/myerrorpage then every thing is working fine i.e. every event is working fine. Also If I use SPUtility.Redirect() method instead of SPUtility.TransferToErrorPage() then also every thing is working fine. My error message is as follow in case of SPUtility.TransferToErrorPage(): Validation of viewstate MAC failed. If this application is hosted by a Web Farm or cluster, ensure that <machineKey> configuration specifies the same validationKey and validation algorithm. AutoGenerate cannot be used in a cluster. StackTrace is [HttpException (0x80004005): Unable to validate data.]    System.Web.Configuration.MachineKeySection.GetDecodedData(Byte[] buf, Byte[] modifier, Int32 start, Int32 length, Int32& dataLength) +10988853    System.Web.UI.ObjectStateFormatter.Deserialize(String inputString) +295 [ViewStateException: Invalid viewstate. Client IP: fe80::8960:150e:cf5d:2e17%11 Port: 53192 User-Agent: Mozill
Categories: 
ASP.NetWindows Application  .NET Framework  C#  VB.Net  ADO.Net  
Sql Server  SharePoint  Silverlight  Others  All   

Hall of Fame    Twitter   Terms of Service    Privacy Policy    Contact Us    Archives   Tell A Friend