I am creating an ASP.NET application which contains an update panel and adds components to it dynamically at runtime. I will have a button which the user clicks to add new fields to the update panel, however, I face a problem in that server controls can only be added to the update panel in Page_Init or Page_Load methods, and page execution will not reach the button click event handler until after these methods have been executed.
Is there any way that the button click event could be handled before Page_Load (but still after the postback data is available)?
Thank you in advance.
I have not understood what you are actually trying to do. The answer is no. The asp.net lifecycle is specific.
Hope I helped!
Related
I am not sure if this is possible but here is my scenario:
I have a web page that has a button to save changes. When the user clicks the button, I save the data in the button click event. However I want to raise an Event which that can be consumed in a separate thread.
Is this possible? If so how do I achieve this?
Thanks in advance.
I'm using a gridview and SQL data source .
After I'm inserting information in data table if I refresh the page the query is executed again and if I refresh it again it will execute again.
Is there any way to disable refresh or make the events unique to be executed only once when the event is raised without execution on refresh
Thanks
if I understand correctly. You have a web form with a button.
You push the button which causes a post back and the event handler for the button press to execute.
Then you hit refresh and the page has the button event handler execute again.
The reason for this is your refreshing the last information sent to the server. Which is the button click information in the __doPostback. This is why you are seeing the event of the button fire again.
ASP.NET doesn't provide a way to do it directly.
Here is an Article talking about how to detect a refresh over a postback.
and your issue is discussed here on other thread
In an asp.net/c# application, I have an update panel on my main page. And everything on the page is updated via the update panel.
So there is only one page and all the changes are made in update panels using asynchronous postback (partial postback)
My question is: Is there a way to make the browser BACK button works and return the page to it's previous state?
Hope I was clear
Thank you very much for any help
more info: I tried to implement this http://rchern.wordpress.com/2008/05/11/updatepanel-backforward-browser-navigation/ but I wasn't able to make it work.
This is often a problem you could look at the resources mentioned in the answer to this question:
How to save history within UpdatePanel?
I have a ListView in ASP.NET where one column consists checkBoxes. I want the user to be able to these CheckBoxes directly in the list (without having to go into edit mode). How I do that, I have received answers in this question
The problem is when the user quickly press several CheckBoxes. It is only the first checkBox that is stored in the database, the other is restored. The user must for every checkBox, wait for the page updated. Is it posible to solve so that the changes are written to the database asynchronously?
You should make Ajax request using JavaScript on checkbox state change
You can use UpdatePanel to write to the database asynchronously and set Trigger to CheckedChanged event
Here's a fun problem. The page in question is wizard like page. here's the scenario-
User clicks on a link button to get to step 2 of the wizard. (The post back can't be avoided. URL based navigation isn't an option.)
User clicks on a radio button/link button/any control that requires a postback for client-server interaction.
The page reloads as if nothing happens.
User repeats step 2. Things work fine.
What I do is this -
I have just one page for all steps of the wizard. Based on the step, the appropiate control is loaded into the page. This control is added to a placeholder control in the OnLoad event. Doing so in OnInit or OnPreRender doesn't work. This step of adding introduces the odd behaviour I've described above.
Any ideas?
Since you're adding controls to your page at runtime to get the wizard to appear on one page, I think this is a simple matter of rearranging some of your code.
Refer to this article at CodeProject - specifically the section that discusses viewstate and dynamic controls in the section called - "Walkthrough 6: Viewstate and Dynamic Controls".
Very simple, you have to re-add control on each postback, re-attach event handlers and give dynamically loaded control same Id.
The application uses a custom control framework. The issue is related to the framework. Had to redesign the approach.