User control button click event to parent page update panel

[rsdev]

Hi,

This is frying my brain.

I have a user control with a menu inside, when the user clicks a linkbutton I would like to update a panel in the main page.

How do I create the proper trigger to update the panel.

Thanks.

[RoninZA]

You will have to create an event that your user control fires, and then catch it in the containing control.

In your custom control, add the following code (this code assumed that it is a click event):

public event ClickHandler MyClickEvent;
 

Then, when you want to fire the event, simply add the code:

MyClickEvent();
 

This event will then be added to the Events list of your control, simply add the handler for the event like you would a normal event, where myClickEventHandler is the handler method written in your containing control:

this.MyClickEvent += new ClickHandler(myClickEventHandler);
 

[rsdev]

Hi RoninZA,

Thanks for your response!

Declaring the ClickEventHandler solved most of my problem. Thanks for that.

I wasn't sure how to initialize the Event in my UpdatePanel (ajax asynchronouspostback). So I used OnClickEvent on my control and referenced this in my UpdatePanel Trigger. This worked well.

But even though my problem is fixed I've unfortunately missed out on undertsanding how to initialize an Event control.

Could you enlighten me.

Thanks again.

[RoninZA]

Only a pleasure rsdev :)

An event is NOT a control... it is an event, and so can not be initialised, but only 'fired', and 'caught'.

C#, VB, and all, OK, let me say MOST (before someone tries to correct me with some arb other language) other visual languages are event-based, as opposed to procedural/linear. Where linear applications have implicit start and end points, and run only from the start to the end, event-based programming involves the firing and catching of events, and the executing of pockets of code as the events occur. An event can be a click, mouse-over, form refresh, etc (look in the events list of a control for examples). Also, custom events can be written to be fired from a custom control... for (a silly) example a 'seven_found' event can be fired from your own counter class when the counter reaches any multiple of seven, and that event can be caught by the object that initialised the counter. There is a LOT of documentation on the net about events in your preferred language, just have a mosey on over to Google and do a search.

I hope I haven't mis-uderstood your question after all this typing!

[Plater]

Hehe, creating my own events was something I had never learned to do.
Is there a way to tell if it's been handled or not? Like throw a "NotHandled" error if the event fires and it's not handled?

public event ClickHandler MyClickEvent;
 

Then, when you want to fire the event, simply add the code:

MyClickEvent();
 

[RoninZA]

No, because a LOT of events are fired, but not necessarily handled, while code is running, events that are not handled can not be identified... at least, not as far as I know.

I suppose if you REALLY wanted to know you could build some event tracking system in, but you'd really have to have a lot of spare time on your hands! :D

[rsdev]

Thanks RoninZA!

I have solved my original problem. Excuse my bad terminology, I am still a novice when it comes to server-side scripting.

Not sure if this is a question for another post!

I would like to change the mode of gridview to 'edit' using javascript onclick event from an update panel? Is this possible.

Thanks again.

[RoninZA]

Sorry rsdev, my web dev experience is pretty limited, so I'm not so sure - best start a new thread!