event-handling

I fell foul of a Firefox keydown behavior in that pressing the enter key (indeed any key) without having focus on a specific field will NOT trigger a keydown event it will only trigger a keypress event. This could be very confusing as the keydown and keyup event use JavaScript key codes whereas keypress uses ASCII codes. Fortunately 13 (enter/return) is common to both. Is there any known reason why FF using keypress in this circumstance? What is the benefit? Once this was established IE8 threw up a silly in that it does not permit preventDefault demanding instead returnValue = false the

In my Silverlight UI, I have a button that when clicked pops up a control with some filtering parameters. I would like this control to hide itself when you click outside of it. In other words, it should function in a manner similar to a combo box, but it's not a combo box (you don't select an item in it). Here's how I'm trying to capture a click outside of the control to dismiss it: public partial class MyPanel : UserControl { public MyPanel() { InitializeComponent(); } private void FilterButton_Click(object sender, RoutedEventArgs e) { // Toggle the open state of the filter popup FilterPopup

I have an array of button which is dynamically generated at run time. I have the function for button click in my code, but I can't find a way to set the button's click name in code. So, what is the code equivalent for XAML: <Button x:Name="btn1" Click="btn1_Click"> Or, what should I place for "????" in the following Code: Button btn = new Button() btn.Name = "btn1"; btn.???? = "btn1_Click"; Tom Dudfield Button btn = new Button(); btn.Name = "btn1"; btn.Click += btn1_Click; private void btn1_Click(object sender, RoutedEventArgs e) { // do something } The following should do the trick: btn.Click

Basically, the problem is with the behaviour of the event "visibilitychange". It's triggered: - When I switch to a different tab inside the browser window. When I click in minimize / restore buttons for the browser window. (this is ok) It's not triggered: - When I switch to a different window/program using ALT+TAB. When I switch to a different window/program clicking on taskbar. (this SHOULD trigger, because, just like when minimizing, the window's visibility may change) W3 Page Visibility API Documentation : http://www.w3.org/TR/page-visibility/ There is no definition of "page visibility"

How to make the update immediately when the jSpinner value was changed. ChangeListener listener = new ChangeListener() { public void stateChanged(ChangeEvent e) { jLabel.setText(e.getSource()); } }; spinner1.addChangeListener(listener); The code above doesnt change the label text automatically, it required you to click again anyplace to update. The answer is to configure the formatter used in the JFormattedTextField which is a child of the spinner's editor: formatter.setCommitsOnValidEdit(true); Unfortunately, getting one's hand on it is as long and dirty as the introductory sentence: final

I have defined new member in my class protected COMObject.Call call_ = null; This class has the following event handler that I subscribed to call_.Destructed += new COMObject.DestructedEventHandler(CallDestructedEvent); Will setting my member to null as following remove the event handler? call_ = null; or I have to unsubscribed with -=? yes, you should use overloaded -= to unsubscribe an event. simply assigning a reference to null will not do that automatically. The object will still be listening to that event. VS1 You should always unsubscribe your event handlers by -= before setting to null