Web Forms :: How A Page Is Posted Back To Server When Press A Button
Apr 20, 2010
Whatever server Control we take on aspx page while in coding phase, all those controls are converted to html controls through the asp.net engine and sent to the requesting web browser. That's fine.
Now, all the controls that are rendered on the browser are html controls. I am bit confused that how after pressing any button (Or any such control that post back pages) page is posted back to the asp.net engine. How such html controls comes to know where (address) they have to go?
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Similar Messages:
Jan 25, 2010
when press back button the previous page control value erased..but I want the control value should be visible.
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Jul 6, 2010
If I'm on a searchable site (example.com for example) and search some data then get a dropdown list, when I click on one of the items, then try to use the browser's back button to go back, I get the error "the page cannot be displayed". Does this have something to do with cookies or history settings?
I don't have this problem with mozilla, but I prefer to use IE for other reasons.
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Feb 13, 2010
I am using Ajax authentication service to login/logout users.And have 2 boxes one for logged users,another for any user.When user logged in he get loged in box,then go to another page,then press back,i have unlogged box.In Page_Load i check if (Reques.IsAuthenticated) then i change box on corresponding,in this case on Logged in box.But Page_Load is not called when i press button back(in browser) or backspace.
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Jul 23, 2010
if users press the browser's back button to reach the prior page..then page should display a message like "web page expired" in asp.net can i use javascript for this?
for example..
there are 4 pages in web sites. 1,2 and 3 can be back. but when the 4th page run then 4th page can not be back... when the user press browser's back button , diaplay ma message "weg page expired".
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Nov 9, 2010
I am trying to build a form that will not change the URL in the users browser, and will not allow the user to press the browser back button. Is there something I can do to accomplish this?
E.g. Form 1
Url: MyForm.aspx
Form 2
Url: MyForm.aspx (still the same url)
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Jul 30, 2010
According to the info in:http://stackoverflow.com/questions/669797/which-values-browser-collects-as-a-postback-data
the value of the HTML input button is sent in a post back. I'm testing in ASP.NET with IE and I am not finding this to be the case.
The markup for my test case is:<%@ Page Language="VB" AutoEventWireup="false" CodeFile="Test.aspx.vb" Inherits="Test" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"> [code]...
My result is that the value of the input button is always "change" when the browser loads the page, but I was expecting it to be "new-value" after postback. The Javascript doTest() function is changing the value when the button is clicked.Is there something more I'm supposed to do for ASP.NET or IE to get the input button value posted back? Or is the information about this functionality
wrong?
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Feb 1, 2010
I want when user press back button of browser.the web page should expire.
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Oct 8, 2010
I've a grid view which could have huge data. When any control like a button causes the postback, I do not want gridview data to post back as it is not required and results in slower responses.
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Nov 22, 2010
I am using Asynchronous File uploader ajax toolkit control.I want to get knowledge of whether page is posted back due to File uploader or not in Page_Load event of my aspx page.
For that i tried to use Page properties IsAsync, IsCallBack but even page is posted back on responce of File Upload these properties are false,only IsPostback property is True.
Why IsAsync and IsCallBack properties are false ?
I was thinking that since this control upload files Asyncronously, so atleast on File Upload IsAsync property should be True.But that is also false .
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Jul 9, 2010
In my current web application I have a listbox containing large number of elements. I have used an ajax listsearchextender to help the users in selecting the elements. I have set the autopostback property of listbox true. The application is working fine as expected in internet explorer. But in firefox while I am typing some text in search lable of listsearchextender the selectedIndexChanged event is fired and the page is posted back. So I am not able to selected the item properly using list search extender control. Can you please suggest me how can I stop the selectedIndexChanged event.
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Jan 21, 2011
the following is the Markup of my page based on a master page. its a log in page with a default login control.
[Code]....
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Jul 7, 2012
i m having problem with logout code in asp.net with c#. this logout code should end session, disable browser's back button and and if somebody try to login by paste the url of any user account page.i used this code in login page
protected void Button1_Click(object sender, EventArgs e)
{
Session["name"] = TxtUserName.Text;
}
and in logout i used this
protected void logout_Click(object sender, EventArgs e)
{
Session.RemoveAll();
Session.Abandon();
Response.ClearHeaders();
Response.Redirect("login.aspx");
}
nothing happening back button is still visible
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Nov 16, 2010
I have a user control with contact form and validators, when I add it (user control) to my parent page I get a strange behavior of all buttons within the parent page, Any button I press on the parent page fires the validators of the user control. How can I vallidate the form on my user control only when I press a specific button?
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Jan 24, 2011
I am trying to see if it possible to create a back button that goes back 3 pages and refreshes that page. The make up of my page is a little complex. The Home page has a password prompt that enables a multiview to be visible with a gridview of information. The gridview has a details link that has a 2 querystrings that gets sent to the details page. The details page has the ability to be edited and updated. this is why I wanted it to go back 3 pages. The code I am using to go back is
<asp:Button ID="Button2" runat="server" CausesValidation="False" OnClientClick="javascript:history.go(-3);return false;" Text="Back" UseSubmitBehavior="False" />
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Aug 25, 2010
I am using an image button and on click of it i want to go to visited page.
Now i am using - Response.Redirect(Request.UrlReferrer.ToString()),
It is going to previous page, but when i am in a page of some user details where the link is looks like - users.aspx?userid=25 and i visit some other page and click back(image button) i want to see the same serdetail page. How to track that.
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Mar 23, 2011
I've a asp:TextBox and a submit button on my asp.net page. Once the button was clicked, the TextBos's value is posted back. I'm going to keep the the posted-back text value into session, so that other child controls can access to the value during their Page_Load. However, I always get NOTHING ("") in the Page_Load method, and I can read the text out in the button click handler. I know that the "button click event" happens after the Page_Load. So, I'm asking how can I "pre-fetch" the TextBox.text during Page_Load?
public partial class form_staffinfo : System.Web.UI.UserControl
{
protected void Page_Load(object sender, EventArgs e){
[code]...
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Feb 5, 2010
I am using ASP.net with C#.After I logout its possible to go back to pages using back button.I could fix the prob for the login.I have prob with the logout.I am using the inbuilt login page provided by the asp editor.Should I use sessions?
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Jan 26, 2010
I am doing project in ASP.NET with C#.net using SQL Server DB,
I am getting endless loop when user logged in after some time page is displaying,
and also i ahave masterpage in that i have login button, when i clicked login buton it is not going to the redirected page, appearing in the same page but sessions are going to be assigned(there are some sessions in login button like loginID). If i presss second time login button then user logged in page is appearing. This problem is when uploaded into server, local it is working good.
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Mar 7, 2011
how to check if a dynamically created control has posted back?The below code is not working.
[Code]....
I have created some imagebuttons dyanmically on page_Init. But the above code always returns null. Why is that? How can I check If an image button has posted back?
Note: I am able to handle the click events of those imagebuttons.
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Feb 1, 2010
I have a Data Grid View which display values from a SQL Query, and inside the data grid view I have two template fields one is Quantity and it is a text box and the other is Total Price and it is a label.
What I want to do is to insert a button called update and when I press this button the price Column should be multiplied by the quantity Column and the result should be displayed in the total Column.
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Sep 25, 2012
am creating a web application in using c# with asp.net.
in that am using login page only as normal aspx page. other pages are using masterpage.
when i click logout button in masterpage. page will redirect to login page. after that if i click browser back button it was moving to previous page. how can i prevent this.
am using this following code in master page aspx page. And My log out button code is below.
<%if (!Page.User.Identity.IsAuthenticated)
{ %>
<script type = "text/javascript" >
function preventBack() { window.history.forward(); }
setTimeout("preventBack()", 0);
window.onunload = function() { null };
</script>
<%} %>
But exactly what i need is once if login page loaded or logged out then it wont go to previous page.
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Dec 30, 2010
I have read that you can not disable the back button on page load but I can clear the cashe on page load so the back button would then be greyed out. I have read a few articles on this and I am unable to get it working. I am using MS visual web developer 2010.
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Jun 8, 2010
i designed a shopping cart application and i implemet some script to prevent back button. If i hit back button i am getting the error as webpage expired. If i refresh again the same page is getting displayed. What i need is i would like to be the user in the same page if he hit the back button. In some cases if i hit back button the previous page is getting displayed and again redirectiing to the current page.
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Nov 12, 2010
From pageA, clicking a button to open pageB which display a crystal report. User can only use browser back button. How to open pageC from pageB? Can I add code in pageB close (if there is a page close event) or make back button in browser to open pageC instead of pageA?
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