I need to construct and show a notification if some errors happen in page life cycle.
Usually, I use Page_PreRender event for last changes but there are also many Control_PreRender events which called after Page_PreRender.
Is there the event that triggered after all Control_PreRender events that can be used to construct and show a notification?
Or if I find and use the latest Control_PreRender event, is guaranted that the order of all Control_PreRender events will stay the same?
based on this link Technically PreRender is your last chance to tweak the page or control before it turns into HTML stream. another alternative you can use jquery document ready to show your notification.
$( document ).ready(function() {
// Handler for show notification
// can by via ajax or just common javascript
});
Related
There is a web page (call it main) that contains several frames.
The main and all its included frames raise event DocumentCompleted.
The order of those events is: Subframe1, subframe2, subframeX.., main.
What I want is to parse the content of the main and add some handlers on several html elements on it before the user can take any action. (For example button.Click or link.Click). Till now this is possible by waiting the DocumentCompleted and checking the event's arguments for the correct frame.
However, sometimes the included frames happen to take much time to load and the desired event is not raised within a reasonal amount of time. However the page is visible by the user despite the fact that parsing and the addition of the handlers cannot be done.
So the impatient user interacts with the page, which messes up all the work.
Is there a recommended way to parse the page sooner without waiting for DocumentCompleted (as long as the data is there of course) and keep doing it silently (that is: not show a waiting form or popup to the user)?
You can use the 'Navigated' event, look here
I have got an issue after updation in UpdatePanel. The issue is the jquery events are not working/firing after the updation in UpdatePanel. At first time, the jquery events work, but not after the updation in UpdatePanel. If I remove the UpdatePanel, the problem is solved. But I have to use the UpdatePanel.
Can you give me a solution for this ?
One of the possible reasons for this is that the UpdatePanel replaces elements in the DOM that had jquery events attached to them which of course nullifies those events. One possible solution would be to use the .live() function to register events but it works only with some events.
If you can't use the live function you will need to reattach those events once the UpdatePanel has finished replacing DOM elements:
Sys.WebForms.PageRequestManager.getInstance().add_endRequest(function(sender, args) {
// TODO: reattach your jquery event handlers
});
You need to bind the Events or the functions that you want to execute even after the page postbacks as the elements do not remember the events attached to them after postback..
So you need call them in the endRequst handler
$(function{
Sys.WebForms.PageRequestManager.getInstance().add_endRequest(AfterPostBack);
AfterPostBack();
});
function AfterPostback(){
// Your code goes here...
}
Somebody know the VListBox?
It is fast to load item to the listbox.
But I can't get the SelectIndexChanged Event be triggered by set SelectIndex.
Somebody know how to trigger that event by winapi or something else?
VlistBox source code is in the page above.
does the event get fired when you click on the item with a mouse?
if so then it may be by design. also if you are selecting it via code then a better way is not "how to manually trigger the event". consider refactoring the event handling code into a new DoSelectionChanged() method and have the code that calls SelectIndex() call that. in this way the "meaty" stuff that normally would be in an event callback can be used by other methods, not just the callback.
hope that helps
Wy don't you call the EventHandler manually?
vListBox1_selectedIndexChanged(null,null);
I have a web application and I'm attempting to put an ajax timer control in it to give me a post back every 10-20 seconds. (possibly longer depending on performance). I have a lot of dynamically created each with auto postback. These controls are inside of their own update panel.
Well, whenever an AJAX timer tick happens, I want to be able to know this at page_load so that I can have some conditions off of this(such as not creating some controls or whatever).
So how can I know at Page_Load time that the reason for the post back was a tick event? I have tried doing something like if(Request.Form[mytimer.UniqueID]!=null) but that is always a false condition(it is always null)
Basically, I just want to know if an AJAX timer tick event will happen, before the event actually occurs(which is after page_load)
I think this is what your looking for:
http://geekswithblogs.net/mahesh/archive/2006/06/27/83264.aspx
The article explains how to figure out which control caused the post back which in your case would be your timer control.
Say that I have a web user control that has several drop down lists in it. They are all set to AutoPostBack = true, BUT each SelectedIndexChanged event handler in my control will fire/chain the other SelectedIndexChanged handlers I have defined for the other DDLs. This means that when the user changes a single DDL, the event handlers are chained/fired for several other DDLs. The logic for which events are chained is very complicated, data driven, and can change depending on which list was actually changed by the user. Therefore, it is very difficult to determine which event handler would fire last.
From the page's point of view, I want to subscribe to a single SelectionChanged Event on the user control that will only fire one time per postback and not until all of the event handlers have fired. I don't care which event handlers have fired, only that the state of the control as a whole has changed.
I'm using C# 3.5/ASP.NET 2.0/VisualStudio 2008
How can I go about doing this?
EDIT: Moved clarification into original description. I think the fact that I specified AutoPostBack=true without specifying that chaining was happening was misleading. I apologize for the confusion.
It depends on when you need the event handler to fire in the page lifecycle.
Here's one strategy:
1) In your user control, track the selection changing of your dropdown lists. If the event handler is executed, update your local tracking variables.
2) In your usercontrol's PreRender handler, check your tracking variables and if called for, fire the user control's SelectionChangedEvent.
This strategy will guarantee that the event handling phase of the page lifecycle is done, but has the drawback that your main page won't receive the "SelectionChanged" on your user control until the PreRender phase. This may or may not work for your situation.
If you need to handle the SelectionChanged event for your usercontrol earlier, then you will likely have to put in more complicated tracking logic in your dropdownlist handlers, and add a tracking variable to ensure that the usercontrol's "SelectionChanged" event only ever gets fired once.
I think you need to create a delgate in child control and then reference that delegate into parent control.