What Is Ispostback==false
what is Ispostback==false
View 9 Replies (Posted: Feb 12, 2009 06:39 AM)
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Urlrewriting IsPostBack Always False?
I am working on rewriting URLs Urlrewriting.net, and have run into what seems to be a common problem but I can seem to fix it. I'll present a simplified case. The URL rewriting is working perfectly with the rule: <urlrewritingnet rewriteOnlyVirtualUrls="true" defaultPage="default.aspx" defaultProvider="RegEx" xmlns="http://www.urlrewriting.net/schemas/config/2006/07"> <rewrites> <add name="catalog" virtualUrl="^~/catalog/(.*)/(.*).aspx" rewriteUrlParameter="ExcludeFromClientQueryString" destinationUrl="~/catalog.aspx?cid=$1&c=$2" ignoreCase="true"/> </rewrites> </urlrewritingnet> On the page I have a DataList with 2 asp:buttons inside. When clicked, the page refreshes but does nothing. I followed ScottGu's article to impliment a form control adapter to rewrite the action of the form to match the rewritten URL. Page URL in the browser: [URL] <form name="aspnetForm" method="post" action="/dev/catalog/13/Music.aspx" id="aspnetForm"> I now see the correct URL on the form action, and when debugging I can see the page load event firing. The problem now is that every time the page loads Page.IsPostback is false, causing the page to rebind the DataList and therefore ignore the ItemCommand the buttons should be triggering. if (!Page.IsPostBack) PopulateControls(); I'm using .NET 3.5 SP1, there is a ScriptManager on the master page but no UpdatePanel on this page. I've also tried resetting the Form.Action property and bypassing ScottGu's solution with the same result. If I go to the page URL directly without using the rewriter everything works fine.
Posted: Sep 29 10 at 1:23
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C# - Whenever RewritePath() Is Called, Page.IsPostBack Is False?
I'm developing a custom URL Rewriter for a ASP.Net 3.5 project. This rewriter is not functionally different than most rewriters out there, the only difference being that the friendly URL collection is not loaded from a web.config file -- it's coming from a database instead. I made the naive assumption that it would be easy to develop a custom rewriter module from scratch, but now I know the mess I put myself in. I digress; let's go straight to the technical issues. While testing the rewriter, I set up a friendly url that would take the user to a web form. Postbacks from this form should not alter the friendly address, as anyone would expect, sohttp://my.web.site/app_root/FriendlyURL is always rewritten asttp://my.web.site/app_root/not_friendly/form.aspxThings are fine when the browser first loads the FriendlyURL. The page comes up and is completely functional. However, when the form is posted back to the server, the page simply reloads but, at server-side, IsPostBack is false. It's like F5 was hit, except that a HTTP POST had indeed occurred.Unsurprisingly, when the interaction occurs through the "unfriendly" URL, the POST action triggers the postback as expected. This evidence suggests that HttpContext.RewritePath is somehow messing with the page lifecycle in a way that it loses sense of the postback operation.
Posted: Mar 23 at 19:34
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Sessions Lost When The Page Is Reloaded (ispostback = False)?
I have an asp.net page that sets a few session variables. On my development machine (localhost), I do a postback and the session values are still populated. When I Reload the page by clicking on the url bar and pressing enter the session variables are still there. However when i deploy this page to a webserver, the page still retains the session values when doing a postback, but as soon as i click the url and press enter the session values are lost (where the ispostback = false) But when i press the refresh button the session variables are present (but i do get a popup warning me that the page data needs to be resent!) i am running IE 7, and the webserver is iis6 what am i doing wrong?!
Posted: Feb 27 10 at 16:00
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Web Forms :: Page.IsPostBack Is False Incorrectly After Page Is Idle For About 20 Minute?
When any of my page is idle for about 20 minute, and after that if I hit any button, like Sumit Button or any other button, at this time, Page.IsPostback is again False, and none of the click event is fired and page gets reloaded again. This happens only if I go like this, open up any of my webpage, keep it idle OR do nothing for about 20 minute, exactly on 21st or 22nd minute, Click on any of the button on the page, and the page gets reloaded, click event does not get fired. I debugged for this and I checked the Page.IsPostback value at this point and I got it as False after 20 minute, I don't know why. It should be True. And because of this my page gets reloaded and nothing gets submitted and every control is in the blank position once again and user have to enter everything again. But if I enter everything and hit any of the button or Submit button within 20 minute, then everything works fine, Submit button's click event is also gets fired and everything works perfect. And this is happening in all of my page. I am not sure what configuration is wrong. But just for more details, I have a master page, I am using Telerik Controls and I have session Timeout set as 60 minute everywhere, in web.config and in IIS settings and in my App_Pool also. On my Master Page, I have ASP:ScriptManager, Tekerik:RadMenu, ASP:ContentPlaceHolder controls and some other controls and javascript code too. [code]....
Posted: Feb 08, 2010 03:18 PM
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AJAX :: Page.IsPostBack Returns False On Partial Page Update?
I have a page with a (gridview nested within a gridview) in an UpdatePanel (UpdateMode="Conditional"). The nested gridview drops down when you click on an arrow and then you can click on each subgrid rows command field. The gridviews are loaded from the Page_Load event. When I click on the commandfield in the subgrid the Page_Load fires during the partial page postback. From what I have read this is normal with UpdatePanels. But What I don't understand is why both Page.IsPostBack and ScriptManager.GetCurrent(Page).IsInAsyncPostBack test false after I click on the command field in my grid. I need to stop the rebinding of the gridviews ( which causes the subgrid to collapse ) when the command field is clicked.Also: I am using MasterPages and the <asp:ScriptManager ID="ScriptManager1" runat="server"> </asp:ScriptManager> is located in my mater page form section.Would anyone have any suggestions how to test if a partial page postback is occuringHere is a link to the page source: http://pastebin.org/153774here is a link to the code behind: http://pastebin.org/153781
Posted: Apr 16, 2010 04:30 PM
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Session When Cookieless ="True" Page Ispostback Is Always False?
When Session attribute Cookieless ="True" the page.Ispostback is always false.Cant understand the reason behind it. And one more thing what is happening when we click Remember Me option in login control.As per my knowledge it is storing authentication cookie in it. If we can add data to authentication cookie then why we need session...we can add session data in that.. and authentication token is also regenerated for every new request like sessions.....i got confused after browsing for few hours. Which one is more secure using cookies or URL for authentication and session.
Posted: Oct 07, 2010 02:03 PM
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Web Forms :: Logic Behind IsPostBack
have gone through many post but unable to identify how IsPostback peroperty of page works.HTTP is a stateless protocol so how server identify that a client is making request 2nd time not 1st time and set the value for IsPostBack Peoprty.
Posted: Aug 16, 2010 04:40 AM
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What Is The Value Of Page.IsPostBack When User Pressed F5
I thought when user pressed Ctrl + F5 will cause page restart, then IsPostBack will be false. But I found when user only pressed F5 will also leed the page restart, so IsPostBack is also false... So, if users press F5 unstopped, will it be a problem like too much pressure for server? is there any way that user pressed F5 we can set the IsPostBack value to be true?
Posted: Aug 02, 2009 02:52 PM
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Web Forms :: Checking IsPostBack And Getting Error Value Cannot Be Null?
I have an aspx page..when the page loads it need to choose to load 1 of 3 possible user controls....so it looks to a Session variable called ContentType. Once it knows the ContentType, It loads the correct control and stores what type of control to display in the cache. This works fine. now....after the user fills out the form, they submit it and I need to redisplay the page...this is where the problem is arising. When the page reloads...I check IsPostBack and if it is a post back....I read which control to display out of the cache and attempt to load it into the Placeholder control on the page. And here is the error that Im Getting: Value cannot be null. Parameter name: child Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.ArgumentNullException: Value cannot be null. Parameter name: child Source Error: Line 49: { Line 50: //load control from cache Line 51: PC1.Controls.Add((Control)Cache["ControlToUse"]); Line 52: } Line 53: }
Posted: Mar 12, 2004 01:23 PM
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State Management :: Output Cache And Not IsPostBack
I'm trying to cache a complex page with lots of controls on it so that if the user navigates to it later it will look like it did when he last saw it.The page has controls which post back and other controls are populated depending on the selections. I'm using [Code].... after the <@ Page directive. What happens is that a postback gets the cached page, so no processing and it looks the same regardless of user selections. So far so good. But if I browse to another page and return by a link, the cached version is ignored and the default page is created again. This is more or less the opposite to what i want. I attempted to use the validation callback to ensure that a postback resulted in a new version, and that worked, but it still ignored the cached page if it wasn't a postback.I realise that it will need more work to ensure each user gets their version of the page from the cache, but why bother if this doesn't work.
Posted: May 18, 2010 04:02 AM
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If (IsPostBack) Property Inside Page_Load Is Doing Return?
I am looking into someone's code for a production application which is working fine.There is one page (main.aspx) and this main.aspx has 5 user controls inside it.Inside the Page_Load event of the main.aspx and all other user controls the first line of code is: protected void Page_Load(object sender, EventArgs e){ if(IsPostBack) return; I am finding this line very strange. As all the button events are postbacks. Then how come this application is working fine?
Posted: Jul 20, 2010 07:47 AM
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I am creating a datagrid dynamically, also creating the columns inside the datagrid dynamically. I just put the paging for the datagrid. dgScrolls.AllowPaging = dgScrolls.PageSize = 5; dgScrolls.PagerStyle.Mode = true;PagerMode.NumericPages; dgScrolls.PageIndexChanged += new DataGridPageChangedEventHandler(this.dgScrolls_PageIndexChanged); { protected void dgScrolls_PageIndexChanged(object source, DataGridPageChangedEventArgs e)try { dgScrolls.CurrentPageIndex = e.NewPageIndex; loadScrolls(); } when I run the application, I can see paging, but when I click on the next page, I get an error. I thought that errror might be coming because in page_load, I am not doing if(!ispostback){loadscrolls;} so I put this code in my page_load, now when I put this code in page load, I got the following error. I wasted lot of time, but couldn't figure out why this error is coming The name 'IsPostBack' does not exist in the current context.
Posted: Sep 02, 2009 04:55 AM
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Web Forms :: Button.click += New Eventhandler() Not Works In If(!ispostback)?
i want to use button.clcik event in function VIewScrap() which is called in if(!ispostback) but itdoes not works any slolution ?if i do not use if(!ispostback) then also button.click works first time well but in second time it just refresh the page for third time clicking it works what 2 do ? my code is given bellow ... using System; using System.Data; using System.Configuration;[code].....
Posted: Oct 18, 2009 05:46 PM
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I have a page that uses a user control, I have to detect the pages !IsPostBack in the User Control and do some operation In the User controls page Load method I tried using the following variations to detect the first load !Page.IsPostBack !Page.IsCallback !this.IsPostBack !this.IsCallback !this.Parent.Page.IsPostBack !this.Parent.Page.IsCallback None of these worked, they all fail to detect the parent pages 1st load in the usercontrols page load method I also tried using if (Request.UrlReferrer.AbsolutePath.ToString() != "/PreviosPage.aspx") This worked for Fire Fox and Chrome but not IE (IE has issues with Request.UrlReferrer, it throws a null exception) So I cant use this approach as well.
Posted: Aug 04, 2010 02:40 PM
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I dynamically add the webcontrol in onInit or onload (page_load). it will cause the second post back and with the ispostback==false; if first enter the page is no problem. but if I click on the some button. it will trigger postback two times. first time: ispostback = true. second time: ispostback = false. the second time postback caused me headache because all my value has been initialized due to the coding like below: DataTable _temp; if(! ispostback) [Code]....
Posted: Jan 17, 2011 06:51 PM
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Posted: Nov 19, 2009 05:57 AM
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Posted: Jan 19 10
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Posted: Nov 2 10 at 8:16
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