I 've seen many WP7 applications, some place event handlers in code, some place event handlers in XAML
Should we add event handler in XAML?
Does that handler automatically unsubscribe to the event when the page is navigated from ?
You can do either, it really doesn't matter! And no, you do not have to worry about adding / removing event handlers when the user navigates from one page to the next. When a page is no longer needed, it is destroyed.
The only time you might want to handle things differently is if you are using the MVVM pattern, when you might want to use commands rather than event handlers.
Related
I have an action creator that fires an action anytime a button key is pressed, however it fires too often especially when a user is typing in a field. In regular react you can use lodash and throttle or debounce that, is there a way to do this with Redux and the way it dispatches actions to throttle it?
I found one article on it https://medium.com/#leonardobrunolima/react-tips-how-to-create-a-redux-middleware-throttle-f2908ee6f49e but that did not work out for me, maybe I copied that example too literally any other examples or resources on this topic? I cannot find anything and any help would be appreciated.
Which callback/delegate is the one to intercept the event of a user clicking on a link within a WebView?
I'd want that URL. I just need to know if it is possible and how should I do in some way.
You can catch events triggered by Javascript code with ScriptNotify event described here.
Not sure what you really want to do but this might be a starting point for you.
I have a custom panel with a couple of components, eg. a button and a text box.
Once the button is clicked I would like custom panel that is also the parent panel receives the event and decides what to do, like call setText on the textbox.
Is it possible to achieve this using an eventbus ?
This means that the child components need not handle their event and then relay it.
I don't know the exact classes and how they work together. But sure you could use the GWT EventBus to achieve this. Fire an event in your button class and handle this event in your custom panel. You can google or find related answers here on stackoverflow.
I think this answer will help you: How to use the GWT EventBus
It's pretty simple to fire events and handle this events in other classes in your application.
I need handle hardware back button in every pages but it is not working.
I can only invoke OnBackKeyPress in main page. and other pages run same functionality that I put in main page OnBackKeyPress event.
I googled it more than 2 hours but didn't find any solution.
It depends on exactly what you are doing. There are two ways to capture the Back key: override OnBackKeyPress of the PhoneApplicationPage class, or attach an event listener to RootFrame.BackKeyPress. If you are attaching an event listener then even if you leave the current page the event listener will still be attached and will be called whenever the Back key is pressed. You'll need to be more specific with exactly what you are doing, what you expect to see, and what you are seeing.
I'm developing an Lotus XPages solution. I have a Custom Control that I would like to have additional functionality in the form of an event call-back.
Is it possible to create a JavaScript callback or event in a custom control? What I'd really like is to add events to one of my controls, something like OnSomething or querySomething and postSomething, so that when the event is fired, the code at the calling end is properly called.
Can it be done??
Thanks!