Web Forms :: Implementing Client Callbacks Programmatically Without Postbacks?
May 6, 2010Apropos MSDN link:
[URL]
[.NET Framework 4 - ASP.NET]
Similar Messages:
Implementing Client Callbacks Programmatically Without Postbacks In Web Pages
May 6, 2010Apropos MSDN link: [URL] [.NET Framework 4 - ASP.NET] Implementing Client Callbacks Programmatically Without Postbacks in ASP.NET Web Pages Using the code from the above link in the following code snippet, if you keep a break point on the statement "if (IsPostBack)" in the Page_Load event. The control moves into the "if (IsPostBack)" block after the alert, which mean that it is a Postback. Then, how come you say "...Without Postbacks"? I am getting confused here.
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="ASPCS2008ClientCallbacksProgrammatically._Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" [URL]>
<%@ Implements Interface="System.Web.UI.ICallbackEventHandler" %>
<script runat="server">
string aStringValue;
public void RaiseCallbackEvent(String eventArgument)
{
aStringValue = eventArgument;
}
public string GetCallbackResult()
{
return aStringValue;
}
protected void Page_Load(object sender, EventArgs e)
{............................................................
Client Callbacks With Master Pages?
Aug 30, 2010I'm following this example: [URL]
And I can get it to work with just a single page and a code behind, but when I add a masterpage, the examples doesn't work properly. Within my master page, I have a head content section and a body content section. It's nothing fancy.
How do i do client callbacks with master pages?
Programmatically Adding A SQLDataSource From Code Behind Stopping Button Postbacks?
Feb 21, 2010i have a really annoying problem in that i need to programmatically create a SQLDatasource and then add it to my asp.net page on the load event. If I do this it all seems to work ok in terms of data binding but for all buttons on the page their postback events stop working?Is this a know issue or must I be doing something wrong?
View 3 RepliesWeb Forms :: Implementing Reliable File Upload Functionality Without Using Client
Sep 26, 2010I want to have an upload functionality for uploading large files -- as large as 1GB. I see some sites successfully implementing reliable upload functionality without using any upload clients e.g. ActiveX, Java, etc. Some suggest, the secret is sending the large file in smaller and more manageable chunks to the server. If that't the case how do I handle that?
View 4 RepliesC# - Implementing A Client Server Solution For Chats?
Dec 29, 2010I have a quite advanced application, where I need to add some client/server functionality. Some examples of functionalities is:
Chat
One vs. one fight in a browser game
Draw people on a map
I am creating this application in ASP.NET and AJAX. I do not use Silverlight/Java Applet/Flash or anything else. If possible, I do not want to change this for other reasons.
I thought about creating some kind of game server, and then communicating either web services or TCP protocol: But I have NO idea if this is a good idea. Also, I don't know how to do this.
So my question is:
What's the best way to implement this? And is it even possible? And if it is, could you give a reference or two?
Jquery - Passing Back The Client Side Style / Class Change To The Server During Postbacks?
Feb 9, 2010I'm dynamically binding tables and sub tables using nested listviews. On the client side I have a piece of jQuery that is toggling the visiblity of TRs witin the tables in order to provide a group expand / contract view option.
On postback I'm obviously loosing my class changes that I have applied via jQuery. I'm wondering what the best approach to maintaining these client side class changes is? I've considered creating a hidden input control per table to store the indexes of the visible TRs at the time of expanding them. The intention being to then look for the indexes during postback / rebinding and add the visible classes to each corresponding element.
Is there a better approach or some native method of passing back the client side style / class change to the server during postbacks?
Web Forms :: Updating A Label With Callbacks?
Jun 14, 2010I'm using a third party control which fires a server side method when a document gets saved. Should there be any problems with saving, I'd like to display a message on the client side, such as:
[Code]....
Doing that in server side doesn't work after discovering IsCallBack = true.
How do you update lblMessage via CallBack without a full PostBack?
C# - Invoking Button Click On Client Side Programmatically?
Jan 4, 2010I'd like to invoke a button click event on an ASP.net page programmatically, using c#. I don't have access to the server-side of the page, so i can't invoke the function directly.
View 3 RepliesAJAX :: Invoke The AsyncFileUpload Programmatically From Client Script?
Jan 20, 2011I would like to call the click event of the the AsyncFileUpload control programmatically, is it possible? I tried to call the click event, but it is not working. actually I don't like the appearance of the upload, so I am trying to hide the AsyncFileUpload control, assign the file name and click it programmatically.
View 2 RepliesC# - Scriptmanager RegisterStartupScript Does Not Work On Callbacks
Feb 8, 2011I am using a third party UI Library (devexpress) to implement some data grids. These grids work with Callbacks (not UpdatePanel partial Postbacks).
I am trying to use Scriptmanager RegisterStartupScript to execute some code on the client after the callback. This works great with partial postbacks but does not work with Callbacks.
Is there any way to queue client side code for execution inside the callback server side handler?
Javascript - Add Callbacks To Jquery Validation (when Used In MVC 2)?
Oct 6, 2010I'm using jquery for validation in my MVC2 web app (as described here) and I'd like to wire up some callbacks that the jquery validation plugin supports, like invalidHandler, etc.
I can manually edit the MicrosoftMvcJQueryValidation.js and add my callbacks (in __MVC_EnableClientValidation, in the options variable) but I was looking for a better approach since that file is used repeatedly and I don't want to have to create one-off copies.
A way to manually add an invalidHandler (etc) callback to the form validation, would be exactly what I need. Obviously this would normally be done via the options when calling validate() for the first time, but since Microsoft controls that particular part, that isnt an option.
JavaScript - How To Implement Super Fast AJAX Callbacks/PageMethods
Feb 7, 2011I am designing an ASP.NET web application (.NET 4.0) which basically has a page that should interact with the code behind every 1-2 seconds (Using Client callbacks or PageMethods via ScriptManager or jQuery.ajax) It'll be hosted on an intranet, so a 1-2 second refresh rate is kind of reasonable.
How can I make the page to access the web service/pagemthod in the code behind in a timeply manner (e.g. every 1 second). Should I use a javascript timer (I'm not familiar with javascrip very much)?
Although the site is hosted on an intranet, but I still need to implement a good approach to reach the desired refresh rate. the amount of data being transfered is about 1KB in each interaction. What are your recommendations on my design regarding this? (using callbacks or ScriptManager or jQuery.ajax,...
JQuery :: Modal Popup That Allows Callbacks Or Asynchronous Calls Without Losing The Popup?
Aug 7, 2010any modal popup controls whereas I can interact with the controls, causing callbacks and asynchronous calls without losing the popup.
I tried with the modalpopupextender, but the popup will disappear with the call and re-rendering the popup like many people will cause massive flashes of the popup which i want to try and avoid.
Web Forms :: IIS Url Rewrite And Postbacks?
Nov 1, 2010I am using IIS Url rewrite to convert urls from /mypage.aspx?q=value to /page/value.html.
Everything works fine during the first call to the page but on postbacks the url is transformed into
/page/value.html?q=value
when using asp controls such as GridViews, Pagers or Custom Controls.
As a result the Server returns a 404 Error and i can see the corrupted url on the browser's address bar.
This problem was observed when i wanted to change the page of a gridview using a pager.
Web Forms :: Saving Data For Postbacks?
Dec 31, 2010I would like to save some data for use after a page postback. Here is an example of what I'd like to do:
Partial Class TestPage
Inherits System.Web.UI.Page
Private _CategoryID As String = ""
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
If Not IsPostBack Then
_CategoryID = "ABC"
Me.ViewState("CategoryID") = _CategoryID
Else
_CategoryID = CType(Me.ViewState("CategoryID"), String)
End If
End Sub
End Class
I've tried both session variables and view state. The page loads fine initially, but on postback I get the following error:
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.
What am I doing wrong? How can I save this data for use after postback?
Web Forms :: Postbacks On Live Server?
Feb 17, 2011I am having a problem with postbacks on my live server.I have added a button to my page with postbackurl="google.com when I press the button it is doing nothing but If I put response.redirect("google..
in the code behind button click event it will work?Is there an simply reason that the postbackurl is not doing anything?
Web Forms :: Loosing Values Between Postbacks?
Jun 30, 2010I have a page, where I dynamically add textboxes within an updatepanel with a button.click event. Those are common telephone, fax, email, etc.. Now I put in some values, store those in Session with Arraylist and go to next page. Here, there is a button to go back to previous page. Ive managed to recreate all those textboxes on Page_Load event, using if not page.ispostback, then.. Now, this problem is driving me crazy. When I load my page, put in some values, add as many textboxes, as I want and go "Next", its ok. Then I go "Back" and everything is recreated and I see as many values within textboxes, that I created. But when I do this for a 2nd time, I can only see recreated textboxes without values. Ive spent some time searching for a simple solution, or an advice. But with no success. I could post some code here, but its a bit long and complicated. But if necesarry, I will.
View 4 RepliesWeb Forms :: Dynamically Populated Dropdownlist And Postbacks
May 26, 2010i am currently working on a webform that has several dynamically populated dropdown lists. this works just fine, however, i have other web controls that require to have a postback..and at the time the page postsback, it reloads my dropdownlists, reseting whatever option i had chosen...
what can i do to resolve this?
Web Forms :: How To Do Asynchronous Postbacks From Generated Controls
Apr 28, 2010I am generating an html flow into Update Panels in a content ASPX page (VB.Net 2008 Professional w/ SP1). These include EDIT anchor tags that call a javascript function which calls __doPostBack(target, args); so I can interact with the code behind. This all works fine except on some of the postbacks the connection with the browser just seems to get closed prematurely and suddenly the webpage displays a directory listing. When debugging it, it only happens sometimes, at different places for the E and D options below but not for the V or AddPost or AddArticle. I am just stepping through E or D and suddenly the web page show a directory listing. (What is that? Is the connection crashing? Is the page suddenly redirecting to the base directory because it crashed?)
[code]....
Web Forms :: How To Retrieve Variable Value Across Page Postbacks
Jan 23, 2010 I have a value variable as: Dim Tax As Decimal = total * 0.075
i would like this value be available to sub procedures on the page even after a postback?
Web Forms :: FileUploadControl: Persisting HTTPPostedFile Across Postbacks?
Jul 9, 2010At present i am able to persist that using session InProc mode. except that i cant use either stateserver or sql server as the HTTPPostedFile is not serilizable. i can't use viewstate either for the same reason. Is there any work around to persist that httppostedfile across postbacks for session modes other than inProc or viewstate?
View 4 RepliesWeb Forms :: Validation Affects All The Buttons And Postbacks?
Apr 16, 2010I have a form, in apge, with validator!
I want it only affects one of buttons! otherwise it does not let the user to change the tabs or do other stuff!!! it keep asks to validate the form!
Web Forms :: Catching Form Postbacks With Masterpages And Usercontrols
Jan 23, 2011I have a website that serves all its pages using a single 404 page. it displays hotel profiles form business and depending on different profile levels offers more or less functionality and information.
Through the DB a masterpage is selected and usercontrols are applyed to that.
I have a contact page like this : 404.aspx > masterpage.Master > contact.ascx
My form action looks like this default.aspx?404%3bhttp%3a%2f%2fwww1.testsite.co.uk%3a80%2fcontactus
and when I click the button this where I send up with an error "Validation of viewstate MAC failed" error.
I have read stuff on these for 4 hours but still have no idea where to start.
Do I need to
Catch the form action URL (postback URL) in the baseclass and change it back to [URL] - If I do this are the form firled values still intact
Do i need to do something to change the form.action url before the page is built, if so is this done in the masterpage preinit event as this is what the form tag is
What I know works is that the usercontrol is aware of the postback, but not the form values.
I want to be able to add a 404 based contact us form on any one of 1000s of profiles and be able to catch the values. Idearly I would like to do this in the codebehind of the usercontrol as this keeps the code seperate
I am sure this must be possible and normally I can work stuff out, but here I am totally stuck. I am trying to do this in VB.
Web Forms :: Keeping Form Data Between Postbacks And Redirect?
Mar 28, 2011I have a situation where I send data to different domain and return back to my domain. At this point I'm losing my form data. I know that we can use sessions, cookies or query strings. But i have large data in the form. So I can't use those. Can anyone best way to save form data between postbacks and redirect.
This is code which I'm using to redirect to different domain and come back to my domain:
[code]....
