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• Click event to a Gwt-connector

  - by sprasad12

  Hi, I am trying to add click event to one of the widgets that use gwt-connector. Here is the code: public class Diagrams extends Diagram implements HasClickHandlers{ public Diagrams(AbsolutePanel boundaryPanel) { super(boundaryPanel); } @Override public HandlerRegistration addClickHandler(ClickHandler handler) { return addDomHandler(handler, ClickEvent.getType()); } @Override public void fireEvent(GwtEvent<?> event) { } } Here Diagram is a gwt-connector class. Here is the link to the Diagram class and also link to GWT-Connector. Question: Am i doing anything wrong in the code while adding the clickhandler? I am getting error saying that addDomHandler is undefined for the type Diagrams. are there limitations for adding click handlers? Any input will be of great help. Thank you.

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• Why does keyboard-slide crash my app?

  - by Brad Hein

  If I physically slide out the keyboard on my Moto Droid A855, it crashes my test app with the stack trace pasted below. I don't understand why? Also, if I start my app with the keyboard out, my app crashes immediately on startup. The app consists of an activity, which contains a viewflipper as the main view layout. The viewflipper contains two linearlayouts... Stack trace: 06-10 21:10:17.652 E/AndroidRuntime( 3785): Uncaught handler: thread main exiting due to uncaught exception 06-10 21:10:17.668 E/AndroidRuntime( 3785): java.lang.IllegalArgumentException: Receiver not registered: android.widget.ViewFlipper$1@447af0b8 06-10 21:10:17.668 E/AndroidRuntime( 3785): at android.app.ActivityThread$PackageInfo.forgetReceiverDispatcher(ActivityThread.java:667) 06-10 21:10:17.668 E/AndroidRuntime( 3785): at android.app.ApplicationContext.unregisterReceiver(ApplicationContext.java:747) 06-10 21:10:17.668 E/AndroidRuntime( 3785): at android.content.ContextWrapper.unregisterReceiver(ContextWrapper.java:321) 06-10 21:10:17.668 E/AndroidRuntime( 3785): at android.widget.ViewFlipper.onDetachedFromWindow(ViewFlipper.java:104) 06-10 21:10:17.668 E/AndroidRuntime( 3785): at android.view.View.dispatchDetachedFromWindow(View.java:5835) 06-10 21:10:17.668 E/AndroidRuntime( 3785): at android.view.ViewGroup.dispatchDetachedFromWindow(ViewGroup.java:1076) 06-10 21:10:17.668 E/AndroidRuntime( 3785): at android.view.ViewGroup.dispatchDetachedFromWindow(ViewGroup.java:1074) 06-10 21:10:17.668 E/AndroidRuntime( 3785): at android.view.ViewGroup.dispatchDetachedFromWindow(ViewGroup.java:1074) 06-10 21:10:17.668 E/AndroidRuntime( 3785): at android.view.ViewGroup.dispatchDetachedFromWindow(ViewGroup.java:1074) 06-10 21:10:17.668 E/AndroidRuntime( 3785): at android.view.ViewRoot.dispatchDetachedFromWindow(ViewRoot.java:1570) 06-10 21:10:17.668 E/AndroidRuntime( 3785): at android.view.ViewRoot.doDie(ViewRoot.java:2556) 06-10 21:10:17.668 E/AndroidRuntime( 3785): at android.view.ViewRoot.die(ViewRoot.java:2526) 06-10 21:10:17.668 E/AndroidRuntime( 3785): at android.view.WindowManagerImpl.removeViewImmediate(WindowManagerImpl.java:218) 06-10 21:10:17.668 E/AndroidRuntime( 3785): at android.view.Window$LocalWindowManager.removeViewImmediate(Window.java:436) 06-10 21:10:17.668 E/AndroidRuntime( 3785): at android.app.ActivityThread.handleDestroyActivity(ActivityThread.java:3498) 06-10 21:10:17.668 E/AndroidRuntime( 3785): at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:3599) 06-10 21:10:17.668 E/AndroidRuntime( 3785): at android.app.ActivityThread.access$2300(ActivityThread.java:119) 06-10 21:10:17.668 E/AndroidRuntime( 3785): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1867) 06-10 21:10:17.668 E/AndroidRuntime( 3785): at android.os.Handler.dispatchMessage(Handler.java:99) 06-10 21:10:17.668 E/AndroidRuntime( 3785): at android.os.Looper.loop(Looper.java:123) 06-10 21:10:17.668 E/AndroidRuntime( 3785): at android.app.ActivityThread.main(ActivityThread.java:4363) 06-10 21:10:17.668 E/AndroidRuntime( 3785): at java.lang.reflect.Method.invokeNative(Native Method) 06-10 21:10:17.668 E/AndroidRuntime( 3785): at java.lang.reflect.Method.invoke(Method.java:521) 06-10 21:10:17.668 E/AndroidRuntime( 3785): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860) 06-10 21:10:17.668 E/AndroidRuntime( 3785): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618) 06-10 21:10:17.668 E/AndroidRuntime( 3785): at dalvik.system.NativeStart.main(Native Method) 06-10 21:10:17.684 I/Process ( 1017): Sending signal. PID: 3785 SIG: 3

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• Capture Silverlight 4 event when panel clicked

  - by Eric J.

  I have a small Silverlight 4 app that essentially consists of a grid containing a label and a combo box. When I click the label, I replace it with a second text box so that I can edit the label (much the way you can edit the name of a Silverlight control in VS2010). I have a LostFocus event handler on the text box that will end editing when the control loses focus (restoring the updated label). Trouble is, users tend to click on the panel when they are done editing rather than on another control (or hitting Enter, which is also supported). I tried adding a left mouse down event handler to the panel. However, that only fires when the text box does not have the focus (I guess the text box captured the mouse?) Is there an approach to recognize that a non-input control was clicked that would enable me to terminate edit mode?

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• Implementing INotifyPropertyChanged with PostSharp 1.5

  - by no9

  Hello all. Im new to .NET and WPF so i hope i will ask the question correctly. I am using INotifyPropertyChanged implemented using PostSharp 1.5: [Serializable, DebuggerNonUserCode, AttributeUsage(AttributeTargets.Assembly | AttributeTargets.Class, AllowMultiple = false, Inherited = false), MulticastAttributeUsage(MulticastTargets.Class, AllowMultiple = false, Inheritance = MulticastInheritance.None, AllowExternalAssemblies = true)] public sealed class NotifyPropertyChangedAttribute : CompoundAspect { public int AspectPriority { get; set; } public override void ProvideAspects(object element, LaosReflectionAspectCollection collection) { Type targetType = (Type)element; collection.AddAspect(targetType, new PropertyChangedAspect { AspectPriority = AspectPriority }); foreach (var info in targetType.GetProperties(BindingFlags.Public | BindingFlags.Instance).Where(pi => pi.GetSetMethod() != null)) { collection.AddAspect(info.GetSetMethod(), new NotifyPropertyChangedAspect(info.Name) { AspectPriority = AspectPriority }); } } } [Serializable] internal sealed class PropertyChangedAspect : CompositionAspect { public override object CreateImplementationObject(InstanceBoundLaosEventArgs eventArgs) { return new PropertyChangedImpl(eventArgs.Instance); } public override Type GetPublicInterface(Type containerType) { return typeof(INotifyPropertyChanged); } public override CompositionAspectOptions GetOptions() { return CompositionAspectOptions.GenerateImplementationAccessor; } } [Serializable] internal sealed class NotifyPropertyChangedAspect : OnMethodBoundaryAspect { private readonly string _propertyName; public NotifyPropertyChangedAspect(string propertyName) { if (string.IsNullOrEmpty(propertyName)) throw new ArgumentNullException("propertyName"); _propertyName = propertyName; } public override void OnEntry(MethodExecutionEventArgs eventArgs) { var targetType = eventArgs.Instance.GetType(); var setSetMethod = targetType.GetProperty(_propertyName); if (setSetMethod == null) throw new AccessViolationException(); var oldValue = setSetMethod.GetValue(eventArgs.Instance, null); var newValue = eventArgs.GetReadOnlyArgumentArray()[0]; if (oldValue == newValue) eventArgs.FlowBehavior = FlowBehavior.Return; } public override void OnSuccess(MethodExecutionEventArgs eventArgs) { var instance = eventArgs.Instance as IComposed<INotifyPropertyChanged>; var imp = instance.GetImplementation(eventArgs.InstanceCredentials) as PropertyChangedImpl; imp.OnPropertyChanged(_propertyName); } } [Serializable] internal sealed class PropertyChangedImpl : INotifyPropertyChanged { private readonly object _instance; public PropertyChangedImpl(object instance) { if (instance == null) throw new ArgumentNullException("instance"); _instance = instance; } public event PropertyChangedEventHandler PropertyChanged; internal void OnPropertyChanged(string propertyName) { if (string.IsNullOrEmpty(propertyName)) throw new ArgumentNullException("propertyName"); var handler = PropertyChanged as PropertyChangedEventHandler; if (handler != null) handler(_instance, new PropertyChangedEventArgs(propertyName)); } } } Then i have a couple of classes (user and adress) that implement [NotifyPropertyChanged]. It works fine. But what i want would be that if the child object changes (in my example address) that the parent object gets notified (in my case user). Would it be possible to expand this code so it automaticly creates listeners on parent objects that listen for changes in its child objets?

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• WPF storyboard object access.

  - by Guru

  Hey, I'm new to silverlight and wpf programming I've just created a simple storyboard in silverlight which increases height and width of a button. As I wanted, I wrote this code so that whenever I move cursor on the button storyboard begins. here is the code used for silverlight. private void button_MouseEnter(object sender, System.Windows.Input.MouseEventArgs e) { if(Storyboard1.GetCurrentState()!=ClockState.Active) Storyboard1.Begin(); } Everything is fine in above scenario as far as I use silverlight. But now I wanted to use the same functionality in WPF. But the problem I faced is that in WPF button click event handler I can't access the Storyboard1 object. Please help me to access the storyboard object in event handler.

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• Paypal subscription API - transaction variables not POSTed

  - by morpheous

  I am writing a payments system based around paypal, I am using the HTML 'API'. I am passing the following form fields to PayPal: 'rm' = 2 'return = http://www.example.com/payment-handler.php?token=sometoken Where 'token' is a token I generated. According to the paypal documentation, a return method (rm) of 2 indicates to Paypal that the transaction data be posted back to the callback url using the POST method. When processing items using 'buy_now' buttons, the transaction items are correctly POSTed to my callback url (payment-handler.php), but for 'subscribe' operations, although the callback url is called, no POST data is sent to the url, and also, the 'token' field is missing. Instead, there is a parameter called 'auth'. I cant see anything in the paypal docs about a 'auth' field - so I dont know whats generating it and if I can reliably using it. Can anyone shed some light on this?

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• AppDomain.CurrentDomain.DomainUnload not be raised in Console app

  - by Guy

  I have an assembly that when accessed spins up a single thread to process items placed on a queue. In that assembly I attach a handler to the DomainUnload event: AppDomain.CurrentDomain.DomainUnload += new EventHandler(CurrentDomain_DomainUnload); That handler joins the thread to the main thread so that all items on the queue can complete processing before the application terminates. The problem that I am experiencing is that the DomainUnload event is not getting fired when the console application terminates. Any ideas why this would be? Using .NET 3.5 and C#

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• C# Nested Repeater Accessing elements

  - by Rich

  I have a list of Accommodation objects bound to a Repeater, and then a nested Repeater which has the various attendee groups listed [e.g. Default, Seniors, Juniors]. This is all output fine, with the values displayed as LinkButtons, which when clicked gets sent to a code-behind event handler. Here is an example of the output to give you a picture [with some er... interesting attendee group names]: In the event handler, I test the object parameter to see which Repeater has been sent, as the outer repeater's links can also be clicked [so the Accommodation would be set, but no Attendee Group]. Is there a way to get a HiddenField from the outer RepeaterItem that contains the currently clicked inner repeater's LinkButton? E.g. From the image, I click the Attending link in the Women section. So the EventArgs via FindControl can get me the hidden field which contains the Attendee Group's ID, which is good, but I also need the Accommodation ID [to know whether it was either Wimbledon Hotel Inn or New Acc]

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• jQuery event.stopPropagation is not working on <a>

  - by HorusKol

  I have the following javascript: $('#ge-display').click(function (event) { window.open('/googleearth/ge-display.php','','scrollbars=yes,menubar=no,height=650,width=1000,resizable=yes,toolbar=yes,location=no,status=no'); event.stopPropagation(); return false; }); the element with id 'ge-display' is a standard link: <a href="/googleearth/ge-display.php" id="ge-display" target="_blank">Load Google Earth Plugin (in a new window)</a> The problem is - when I take out the 'return false;' line from the click event handler, the javascript popup opens, and then another browser window opens - I thought stopPropagation() would prevent the links own click handler? I've also tried stopImmediatePropagation() - but I still need to return false to stop the default behaviour of the link.

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• Android Application Crashel

  - by deewangan

  hello everyone, i am trying to run an application on an android emulator, but it crashes. i am following a howto i don't know what to do, it just crashes. other applications are running fine, can anyone tell me what i am doing wrong.here is the code: public class Finder extends Activity { /** Called when the activity is first created. */ private LocationManager myLocationManager; private LocationListener myLocationListener; private TextView myLatitude, myLongitude; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); myLatitude = (TextView)findViewById(R.id.Latitude); myLongitude = (TextView)findViewById(R.id.Longitude); myLocationManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE); myLocationListener = new MyLocationListener(); myLocationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,0,0,myLocationListener); myLatitude.setText(String.valueOf( myLocationManager.getLastKnownLocation( LocationManager.GPS_PROVIDER).getLatitude())); myLongitude.setText(String.valueOf( myLocationManager.getLastKnownLocation( LocationManager.GPS_PROVIDER).getLongitude())); } private class MyLocationListener implements LocationListener{ public void onLocationChanged(Location argLocation) { // TODO Auto-generated method stub myLatitude.setText(String.valueOf( argLocation.getLatitude())); myLongitude.setText(String.valueOf( argLocation.getLongitude())); } public void onProviderDisabled(String provider) { // TODO Auto-generated method stub } public void onProviderEnabled(String provider) { // TODO Auto-generated method stub } public void onStatusChanged(String provider, int status, Bundle extras) { // TODO Auto-generated method stub } }; } i looked in the logcat after running the application, it seems that the following lines are cause of the problem but i don't understand it:( 01-18 22:12:46.017: WARN/dalvikvm(1091): threadid=3: thread exiting with uncaught exception (group=0x4001aa28) 01-18 22:12:46.017: ERROR/AndroidRuntime(1091): Uncaught handler: thread main exiting due to uncaught exception 01-18 22:12:46.037: ERROR/AndroidRuntime(1091): java.lang.RuntimeException: Unable to start activity ComponentInfo{pro.googleLocation/pro.googleLocation.Finder}: java.lang.NullPointerException 01-18 22:12:46.037: ERROR/AndroidRuntime(1091): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2401) 01-18 22:12:46.037: ERROR/AndroidRuntime(1091): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2417) 01-18 22:12:46.037: ERROR/AndroidRuntime(1091): at android.app.ActivityThread.access$2100(ActivityThread.java:116) 01-18 22:12:46.037: ERROR/AndroidRuntime(1091): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1794) 01-18 22:12:46.037: ERROR/AndroidRuntime(1091): at android.os.Handler.dispatchMessage(Handler.java:99) 01-18 22:12:46.037: ERROR/AndroidRuntime(1091): at android.os.Looper.loop(Looper.java:123) 01-18 22:12:46.037: ERROR/AndroidRuntime(1091): at android.app.ActivityThread.main(ActivityThread.java:4203) 01-18 22:12:46.037: ERROR/AndroidRuntime(1091): at java.lang.reflect.Method.invokeNative(Native Method) 01-18 22:12:46.037: ERROR/AndroidRuntime(1091): at java.lang.reflect.Method.invoke(Method.java:521) 01-18 22:12:46.037: ERROR/AndroidRuntime(1091): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:791) 01-18 22:12:46.037: ERROR/AndroidRuntime(1091): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:549) 01-18 22:12:46.037: ERROR/AndroidRuntime(1091): at dalvik.system.NativeStart.main(Native Method) 01-18 22:12:46.037: ERROR/AndroidRuntime(1091): Caused by: java.lang.NullPointerException 01-18 22:12:46.037: ERROR/AndroidRuntime(1091): at pro.googleLocation.Finder.onCreate(Finder.java:28) 01-18 22:12:46.037: ERROR/AndroidRuntime(1091): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1123) 01-18 22:12:46.037: ERROR/AndroidRuntime(1091): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2364) 01-18 22:12:46.037: ERROR/AndroidRuntime(1091): ... 11 more

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• Resolving HttpRequestScoped Instances outside of a HttpRequest in Autofac

  - by Page Brooks

  Suppose I have a dependency that is registered as HttpRequestScoped so there is only one instance per request. How could I resolve a dependency of the same type outside of an HttpRequest? For example: // Global.asax.cs Registration builder.Register(c => new MyDataContext(connString)).As<IDatabase>().HttpRequestScoped(); _containerProvider = new ContainerProvider(builder.Build()); // This event handler gets fired outside of a request // when a cached item is removed from the cache. public void CacheItemRemoved(string k, object v, CacheItemRemovedReason r) { // I'm trying to resolve like so, but this doesn't work... var dataContext = _containerProvider.ApplicationContainer.Resolve<IDatabase>(); // Do stuff with data context. } The above code throws a DependencyResolutionException when it executes the CacheItemRemoved handler: No scope matching the expression 'value(Autofac.Builder.RegistrationBuilder`3+<c__DisplayClass0[MyApp.Core.Data.MyDataContext,Autofac.Builder.SimpleActivatorData,Autofac.Builder.SingleRegistrationStyle]).lifetimeScopeTag.Equals(scope.Tag)' is visible from the scope in which the instance was requested.

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• window.beforeunload called twice in Firefox - how to get around this?

  - by Zarkonnen

  I'm creating a popup window that has a beforeunload handler installed. When the "Close" file menu item is used to close the popup, the beforeunload handler is called twice, resulting in two "Are you sure you want to close this window?" messages appearing. This is a bug with Firefox, and I've reported it here, but I still would like a way to prevent this from happening. Can you think of a sane way of detecting double beforeunload to prevent the double message problem? The problem is that Firefox doesn't tell me which button in the dialog the user elected to click - OK or cancel.

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• What are some best practices for structuring cherrypy apps?

  - by Omega

  I'm writing a cherrypy app and I was wondering what the best way is for structuring my handlers and code for larger applications? I realize assignment is simple trough cherrypy.root, but what are some practices for writing the handlers and assigning them? (Allow me to prove my confusion!) My initial thought is to write a standard handler class that infers a template to run based on the current URL or class/method combination. Then I would assign one instance of that handler multiple times to the path to create pages. I don't see this working however as the recursive references wouldn't work quite right. So, given the fact that I'm already drawing blanks on how my own source code should look, I'd love some pointers and examples! Feel free to ask some detailed questions for me to clarify. While there is plenty of cherrypy tutorial material out there, it tends to only scratch the surface.

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• Rest Web Service with App Engine and Webapp

  - by fceruti

  I want to build a REST web service on app engine. Currently i have this: from google.appengine.ext import webapp from google.appengine.ext.webapp import util class UsersHandler(webapp.RequestHandler): def get(self, name): self.response.out.write('Hello '+ name+'!') def main(): util.run_wsgi_app(application) #Map url like /rest/users/johnsmith application = webapp.WSGIApplication([(r'/rest/users/(.*)',UsersHandler)] debug=True) if __name__ == '__main__': main() And i would like to retreive for example all my users when the path /rest/users is accessed. I Imagine I can do this by building another handler, but I want to know if is possible to do it inside of this handler.

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• Django version in GAE

  - by Alex

  I'm tring to use Django 1.1 in GAE, But when I uncomment use_library('django', '1.1') in this script import os os.environ['DJANGO_SETTINGS_MODULE'] = 'settings' from google.appengine.dist import use_library #use_library('django', '1.1') # Google App Engine imports. from google.appengine.ext.webapp import util # Force Django to reload its settings. from django.conf import settings settings._target = None import django.core.handlers.wsgi import django.core.signals import django.db import django.dispatch.dispatcher # Unregister the rollback event handler. django.dispatch.dispatcher.disconnect( django.db._rollback_on_exception, django.core.signals.got_request_exception) def main(): # Create a Django application for WSGI. application = django.core.handlers.wsgi.WSGIHandler() # Run the WSGI CGI handler with that application. util.run_wsgi_app(application) if __name__ == "__main__": main() I receives AttributeError: 'module' object has no attribute 'disconnect' What is going on?

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• MVVM - implementing 'IsDirty' functionality to a ModelView in order to save data

  - by Brendan

  Hi, Being new to WPF & MVVM I struggling with some basic functionality. Let me first explain what I am after, and then attach some example code... I have a screen showing a list of users, and I display the details of the selected user on the right-hand side with editable textboxes. I then have a Save button which is DataBound, but I would only like this button to display when data has actually changed. ie - I need to check for "dirty data". I have a fully MVVM example in which I have a Model called User: namespace Test.Model { class User { public string UserName { get; set; } public string Surname { get; set; } public string Firstname { get; set; } } } Then, the ViewModel looks like this: using System.Collections.ObjectModel; using System.Collections.Specialized; using System.Windows.Input; using Test.Model; namespace Test.ViewModel { class UserViewModel : ViewModelBase { //Private variables private ObservableCollection<User> _users; RelayCommand _userSave; //Properties public ObservableCollection<User> User { get { if (_users == null) { _users = new ObservableCollection<User>(); //I assume I need this Handler, but I am stuggling to implement it successfully //_users.CollectionChanged += HandleChange; //Populate with users _users.Add(new User {UserName = "Bob", Firstname="Bob", Surname="Smith"}); _users.Add(new User {UserName = "Smob", Firstname="John", Surname="Davy"}); } return _users; } } //Not sure what to do with this?!?! //private void HandleChange(object sender, NotifyCollectionChangedEventArgs e) //{ // if (e.Action == NotifyCollectionChangedAction.Remove) // { // foreach (TestViewModel item in e.NewItems) // { // //Removed items // } // } // else if (e.Action == NotifyCollectionChangedAction.Add) // { // foreach (TestViewModel item in e.NewItems) // { // //Added items // } // } //} //Commands public ICommand UserSave { get { if (_userSave == null) { _userSave = new RelayCommand(param => this.UserSaveExecute(), param => this.UserSaveCanExecute); } return _userSave; } } void UserSaveExecute() { //Here I will call my DataAccess to actually save the data } bool UserSaveCanExecute { get { //This is where I would like to know whether the currently selected item has been edited and is thus "dirty" return false; } } //constructor public UserViewModel() { } } } The "RelayCommand" is just a simple wrapper class, as is the "ViewModelBase". (I'll attach the latter though just for clarity) using System; using System.ComponentModel; namespace Test.ViewModel { public abstract class ViewModelBase : INotifyPropertyChanged, IDisposable { protected ViewModelBase() { } public event PropertyChangedEventHandler PropertyChanged; protected virtual void OnPropertyChanged(string propertyName) { PropertyChangedEventHandler handler = this.PropertyChanged; if (handler != null) { var e = new PropertyChangedEventArgs(propertyName); handler(this, e); } } public void Dispose() { this.OnDispose(); } protected virtual void OnDispose() { } } } Finally - the XAML <Window x:Class="Test.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:vm="clr-namespace:Test.ViewModel" Title="MainWindow" Height="350" Width="525"> <Window.DataContext> <vm:UserViewModel/> </Window.DataContext> <Grid> <ListBox Height="238" HorizontalAlignment="Left" Margin="12,12,0,0" Name="listBox1" VerticalAlignment="Top" Width="197" ItemsSource="{Binding Path=User}" IsSynchronizedWithCurrentItem="True"> <ListBox.ItemTemplate> <DataTemplate> <StackPanel> <TextBlock Text="{Binding Path=Firstname}"/> <TextBlock Text="{Binding Path=Surname}"/> </StackPanel> </DataTemplate> </ListBox.ItemTemplate> </ListBox> <Label Content="Username" Height="28" HorizontalAlignment="Left" Margin="232,16,0,0" Name="label1" VerticalAlignment="Top" /> <TextBox Height="23" HorizontalAlignment="Left" Margin="323,21,0,0" Name="textBox1" VerticalAlignment="Top" Width="120" Text="{Binding Path=User/UserName}" /> <Label Content="Surname" Height="28" HorizontalAlignment="Left" Margin="232,50,0,0" Name="label2" VerticalAlignment="Top" /> <TextBox Height="23" HorizontalAlignment="Left" Margin="323,52,0,0" Name="textBox2" VerticalAlignment="Top" Width="120" Text="{Binding Path=User/Surname}" /> <Label Content="Firstname" Height="28" HorizontalAlignment="Left" Margin="232,84,0,0" Name="label3" VerticalAlignment="Top" /> <TextBox Height="23" HorizontalAlignment="Left" Margin="323,86,0,0" Name="textBox3" VerticalAlignment="Top" Width="120" Text="{Binding Path=User/Firstname}" /> <Button Content="Button" Height="23" HorizontalAlignment="Left" Margin="368,159,0,0" Name="button1" VerticalAlignment="Top" Width="75" Command="{Binding Path=UserSave}" /> </Grid> </Window> So basically, when I edit a surname, the Save button should be enabled; and if I undo my edit - well then it should be Disabled again as nothing has changed. I have seen this in many examples, but have not yet found out how to do it. Any help would be much appreciated! Brendan

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• GoogleAppEngine : ClassNotFoundException : javax.jdo.metadata.ComponentMetadata

  - by James.Elsey

  I'm trying to deploy my application to a locally running GoogleAppEngine development server, but I'm getting the following stack trace when I start the server Apr 23, 2010 9:03:33 PM com.google.apphosting.utils.jetty.JettyLogger warn WARNING: Nested in org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'clientDao' defined in ServletContext resource [/WEB-INF/applicationContext.xml]: Cannot resolve reference to bean 'entityManagerFactory' while setting bean property 'entityManagerFactory'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'entityManagerFactory' defined in ServletContext resource [/WEB-INF/applicationContext.xml]: Invocation of init method failed; nested exception is java.lang.NoClassDefFoundError: javax/jdo/metadata/ComponentMetadata: java.lang.ClassNotFoundException: javax.jdo.metadata.ComponentMetadata at java.net.URLClassLoader$1.run(URLClassLoader.java:217) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:205) at java.lang.ClassLoader.loadClass(ClassLoader.java:319) at com.google.appengine.tools.development.IsolatedAppClassLoader.loadClass(IsolatedAppClassLoader.java:151) at java.lang.ClassLoader.loadClass(ClassLoader.java:264) at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:332) at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Class.java:264) at javax.jdo.JDOHelper$18.run(JDOHelper.java:2009) at javax.jdo.JDOHelper$18.run(JDOHelper.java:2007) at java.security.AccessController.doPrivileged(Native Method) at javax.jdo.JDOHelper.forName(JDOHelper.java:2006) at javax.jdo.JDOHelper.invokeGetPersistenceManagerFactoryOnImplementation(JDOHelper.java:1155) at javax.jdo.JDOHelper.getPersistenceManagerFactory(JDOHelper.java:803) at javax.jdo.JDOHelper.getPersistenceManagerFactory(JDOHelper.java:698) at org.datanucleus.jpa.EntityManagerFactoryImpl.initialisePMF(EntityManagerFactoryImpl.java:482) at org.datanucleus.jpa.EntityManagerFactoryImpl.<init>(EntityManagerFactoryImpl.java:255) at org.datanucleus.store.appengine.jpa.DatastoreEntityManagerFactory.<init>(DatastoreEntityManagerFactory.java:68) at org.datanucleus.store.appengine.jpa.DatastorePersistenceProvider.createContainerEntityManagerFactory(DatastorePersistenceProvider.java:45) at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.createNativeEntityManagerFactory(LocalContainerEntityManagerFactoryBean.java:224) at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.afterPropertiesSet(AbstractEntityManagerFactoryBean.java:291) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1369) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1335) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:473) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory$1.run(AbstractAutowireCapableBeanFactory.java:409) at java.security.AccessController.doPrivileged(Native Method) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:380) at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:264) at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:261) at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:185) at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:164) at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveReference(BeanDefinitionValueResolver.java:269) at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveValueIfNecessary(BeanDefinitionValueResolver.java:104) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1245) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1010) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:472) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory$1.run(AbstractAutowireCapableBeanFactory.java:409) at java.security.AccessController.doPrivileged(Native Method) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:380) at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:264) at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:261) at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:185) at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:164) at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:429) at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:728) at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:380) at org.springframework.web.context.ContextLoader.createWebApplicationContext(ContextLoader.java:255) at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:199) at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:45) at org.mortbay.jetty.handler.ContextHandler.startContext(ContextHandler.java:530) at org.mortbay.jetty.servlet.Context.startContext(Context.java:135) at org.mortbay.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1218) at org.mortbay.jetty.handler.ContextHandler.doStart(ContextHandler.java:500) at org.mortbay.jetty.webapp.WebAppContext.doStart(WebAppContext.java:448) at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:40) at org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java:117) at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:40) at org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java:117) at org.mortbay.jetty.Server.doStart(Server.java:217) at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:40) at com.google.appengine.tools.development.JettyContainerService.startContainer(JettyContainerService.java:181) at com.google.appengine.tools.development.AbstractContainerService.startup(AbstractContainerService.java:116) at com.google.appengine.tools.development.DevAppServerImpl.start(DevAppServerImpl.java:217) at com.google.appengine.tools.development.DevAppServerMain$StartAction.apply(DevAppServerMain.java:162) at com.google.appengine.tools.util.Parser$ParseResult.applyArgs(Parser.java:48) at com.google.appengine.tools.development.DevAppServerMain.<init>(DevAppServerMain.java:113) at com.google.appengine.tools.development.DevAppServerMain.main(DevAppServerMain.java:89) The server is running at http://localhost:1234/ I'm a little confused over this, since I have the same application running locally on GlassFish/MySQL. All I have done is to swap in the relevant jar files, and change the persistence.xml. My applicationContext.xml looks as follows : <context:annotation-config/> <bean id="clientDao" class="com.jameselsey.salestracker.dao.jpa.JpaDaoClient"> <property name="entityManagerFactory" ref="entityManagerFactory"/> </bean> <bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean"/> <bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager"> <property name="entityManagerFactory" ref="entityManagerFactory" /> </bean> <bean id="org.springframework.context.annotation.internalPersistenceAnnotationProcessor" class="com.jameselsey.salestracker.util.GaeFixInternalPersistenceAnnotationProcessor" /> <bean class="org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor"/> <tx:annotation-driven/> <bean id="clientService" class="com.jameselsey.salestracker.service.ClientService"/> </beans> My JPA DAO looks like this public class JpaDao extends JpaDaoSupport { protected <T> List<T> findAll(Class<T> clazz) { return getJpaTemplate().find("select c from " + clazz.getName() + " c"); } protected <T> T findOne(String jpql, Map params) { List<T> results = getJpaTemplate().findByNamedParams(jpql, params); if(results.isEmpty()) { return null; } if(results.size() > 1) { throw new IncorrectResultSizeDataAccessException(1, results.size()); } return results.get(0); } } And an example implemented method looks like this : @Override public Client getClientById(Integer clientId) { String jpql = "SELECT c " + "FROM com.jameselsey.salestracker.domain.Client c " + "WHERE c.id = " + clientId; return (Client) getJpaTemplate().find(jpql).get(0); } Like I say, this works ok on Glassfish/MySQL, is it possible this error could be a red herring to something else?

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• Setting checkstate on a ListWidgetItem

  - by viraptor

  Hi, I'm trying to create a list of checkbox items that change the status on activation. I can connect the activate signal and everything seems to work, but changes on the screen. Am I missing some steps here? Here's the list creation: self.listField = QtGui.QListWidget(self) muted_categories = qb.settingsCollection['mutedCategories'].split('|') main_categories = sorted(set(qb.categoryTopNames.values())) for category in main_categories: item = QtGui.QListWidgetItem(category, self.listField) item.setFlags(QtCore.Qt.ItemIsUserCheckable | QtCore.Qt.ItemIsEnabled) if category in muted_categories: item.setCheckState(QtCore.Qt.Checked) else: item.setCheckState(QtCore.Qt.Unchecked) self.listField.connect(self.listField, QtCore.SIGNAL('itemActivated(QListWidgetItem*)'), self.doItemChangeState) and here's the handler: def doItemChangeState(self, item): """ invert the state of the activated item """ if item.checkState() == QtCore.Qt.Checked: item.setCheckState(QtCore.Qt.Unchecked) else: item.setCheckState(QtCore.Qt.Checked) I verified that the handler is fired after clicking - if I put prints there, it will alternate "checked" / "unchecked". What can I do to refresh the checkboxes themselves?

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• How to get Netty websocket client example working

  - by Paul Butcher

  I'm struggling to get the netty example websocket client working. I've compiled successfully with 4.0.0.Alpha8, but when I try to connect to a server (also a netty example) I get: Exception in thread "main" io.netty.handler.codec.http.websocketx.WebSocketHandshakeException: Invalid handshake response upgrade: websocket at io.netty.handler.codec.http.websocketx.WebSocketClientHandshaker13.finishHandshake(WebSocketClientHandshaker13.java:204) which makes no sense to me whatsoever, given that this piece of code reads: String upgrade = response.getHeader(Names.UPGRADE); if (!Values.WEBSOCKET.equalsIgnoreCase(upgrade)) { throw new WebSocketHandshakeException("Invalid handshake response upgrade: " + response.getHeader(Names.UPGRADE)); } And as the message in the exception demonstrates, the Upgrade header does contain websocket as expected. Any idea what's going on?

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• HttpTransportSE requestDump gives NullPointerException

  - by Chamila

  Hi, I'm trying to access a webservice in Android via Ksoap2 for android. The SoapObject is created ok, the S.o.p of the bodyOut outputs the desired strings. But when I do a requestDump of the HttpTransportSE object I create to make the call, a NullPointerException happens. In other words, the transport object is null. How can this happen? Web Service is at http://srilanka.lk:9080/services/CropServiceProxy?wsdl This service works very well with SoapUI. SoapUI Request <soap:Envelope xmlns:soap="http://www.w3.org/2003/05/soap-envelope" xmlns:v1="http://schemas.icta.lk/xsd/crop/handler/v1/"> <soap:Header/> <soap:Body> <v1:getCropDataList> <v1:code>ABK</v1:code> </v1:getCropDataList> </soap:Body> </soap:Envelope> SoapUI Response <soapenv:Envelope xmlns:soapenv="http://www.w3.org/2003/05/soap-envelope"> <soapenv:Body> <ns1:getCropDataListResponse xmlns:ns1="http://schemas.icta.lk/xsd/crop/handler/v1/"> <ns1:cropInfo> <ns1:name>Ambul Kesel</ns1:name> <ns1:price>35.0</ns1:price> <ns1:location>Dambulla</ns1:location> </ns1:cropInfo> <ns1:cropInfo> <ns1:name>Ambul Kesel</ns1:name> <ns1:price>40.0</ns1:price> <ns1:location>Dambulla</ns1:location> </ns1:cropInfo> </ns1:getCropDataListResponse> </soapenv:Body> </soapenv:Envelope> Client Side Complex Type KvmSerializable implementation public class CropInfo implements KvmSerializable { private String name; private float price; private String location; @Override public Object getProperty(int arg0) { switch (arg0){ case 0: return name; case 1: return price; case 2: return location; default: return null; } } @Override public int getPropertyCount() { return 3; } @Override public void getPropertyInfo(int arg0, Hashtable arg1, PropertyInfo arg2) { switch (arg0){ case 0: arg2.type = PropertyInfo.STRING_CLASS; arg2.name = "Name"; break; case 1: arg2.type = Float.class; arg2.name = "Price"; break; case 2: arg2.type = PropertyInfo.STRING_CLASS; arg2.name = "Location"; break; default: break; } } @Override public void setProperty(int arg0, Object arg1) { switch(arg0){ case 0: name = arg1.toString(); break; case 1: price = Float.parseFloat(arg1.toString()); case 2: location = arg1.toString(); default: break; } } } Web Service Call public void btnOnClick(View v){ String NAMESPACE = "http://schemas.icta.lk/xsd/crop/handler/v1/"; String URL = "http://220.247.225.202:9080/services/CropServiceProxy.CropServiceProxyHttpSoap12Endpoint"; String method_name = "getCropDataList"; String SOAP_ACTION = "http://schemas.icta.lk/xsd/crop/handler/v1/getCropDataList"; SoapObject soap_request = new SoapObject(NAMESPACE, method_name); soap_request.addProperty("code", "ABK" ); SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(SoapEnvelope.VER12); envelope.setOutputSoapObject(soap_request); envelope.addMapping(NAMESPACE, "cropInfo", CropInfo.class); //envelope.dotNet=true; Marshal floatMarshal = new MarshalFloat(); floatMarshal.register(envelope); System.out.println("body out : " + envelope.bodyOut.toString()); //AndroidHttpTransport http_transport = new AndroidHttpTransport(URL); HttpTransportSE http_transport = new HttpTransportSE(URL); try { //NullPointerException HERE System.out.println(http_transport.requestDump); http_transport.call(SOAP_ACTION, envelope); //because we should expect a vector, two kinds of prices are given Vector<CropInfo> result_array = (Vector<CropInfo>)envelope.getResponse(); if(result_array != null){ for (CropInfo current_crop: result_array){ System.out.println(current_crop.getName()); System.out.println(Float.toString(current_crop.getPrice())); } } } catch (Exception e) { e.printStackTrace(); answer.setText("error caught"); //System.out.println(http_transport.responseDump); } // String result_string[] = (String[])result; //answer.setText("returned"); } Can anyone explain this?

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• Workaround iPhone's browser not honoring the <label> element

  - by Sorin Comanescu

  Hi, Just ran into this recently and I thought it'd be helpful to share. The HTML <label> element is supported in a weird way by iPhone's (v3) browser. Try this: <input type="checkbox" id="chkTest" /><label for="chkTest">Click me!</label> Tapping the "Click me!" label has no effect, the checkbox is not checked. Lack of support in a touch device for <label> elements puzzled me and I tried to overcome this issue by using javascript. The surprise came when a I noticed a void javascript like the one below also did the trick: <input type="checkbox" id="chkTest" /><label for="chkTest" onclick="javascript:void(0);">Click me!</label> HTH Further info: Also works with an empty handler: onclick="" Disabling JavaScript inactivates again the label, even if using the empty handler.

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• WPF exception handling when launched from WinForms

  - by Sonic Soul

  so i came across this interesting article on WPF exception handling: http://srtsolutions.com/public/item/251263 it works by declaring DispatcherUnhandledException handler in xaml <application> node. but what if a WPF window is launched from win forms application? where can i declare a general exception handler? The problem is that when WPF crashes, it brings down the whole WinForms app with it. *Edit what if instead of launching the WPF window directly, i launched an "Application" which than defined a start window?? is that possible/advisable?

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• ASP.NET Nested Repeater Accessing elements

  - by Rich

  I have a list of Accommodation objects bound to a Repeater, and then a nested Repeater which has the various attendee groups listed [e.g. Default, Seniors, Juniors]. This is all output fine, with the values displayed as LinkButtons, which when clicked gets sent to a code-behind event handler. Here is an example of the output to give you a picture [with some er... interesting attendee group names]: In the event handler, I test the object parameter to see which Repeater has been sent, as the outer repeater's links can also be clicked [so the Accommodation would be set, but no Attendee Group]. Is there a way to get a HiddenField from the outer RepeaterItem that contains the currently clicked inner repeater's LinkButton? E.g. From the image, I click the Attending link in the Women section. So the EventArgs via FindControl can get me the hidden field which contains the Attendee Group's ID, which is good, but I also need the Accommodation ID [to know whether it was either Wimbledon Hotel Inn or New Acc]

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• App Engine webapp.RequestHandler child instances has no self.request during __init__

  - by grucha

  i use modified webapp.RequestHandler for handling requests in my app: class MyRequestHandler(webapp.RequestHandler): """ Request handler with some facilities like user. self.out is the dictionary to pass to templates """ def __init__(self, *args, **kwargs): super(MyRequestHandler, self).__init__(*args, **kwargs) self.out = { 'user': users.get_current_user(), 'logout_url': users.create_logout_url(self.request.uri) } def render(self, template_name): """ Shortcut to render templates """ self.response.out.write(template.render(template_name, self.out)) class DeviceList(MyRequestHandler): def get(self): self.out['devices'] = GPSDevice.all().fetch(1000) self.render('templates/device_list.html') but I get an exception: line 28, in __init__ self.out['logout_url'] = users.create_logout_url(self.request.uri) AttributeError: 'DeviceList' object has no attribute 'request' When the code causing exception is moved out of __init__ everything's fine: class MyRequestHandler(webapp.RequestHandler): """ Request handler with some facilities like user. self.out is the dictionary to pass to templates and initially it contains user object for example """ def __init__(self, *args, **kwargs): super(MyRequestHandler, self).__init__(*args, **kwargs) self.out = { 'user': users.get_current_user(), } def render(self, template_name): """ Shortcut to render templates """ self.out['logout_url'] = users.create_logout_url(self.request.uri) self.response.out.write(template.render(template_name, self.out)) Whi is that? Why there's no self.request after parent's (i.e. webapp.RequestHandler's) __init__ was executed?

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• Testing a Django view cause "AttributeError: 'NoneType' object has no attribute 'handler500'" error

  - by jack

  I just wanted to start testing a Django view using the code below: from django.test.client import Client c = Client() response = c.get('/search/keyword') print response.content It just throws out following error message: "/usr/local/lib/python2.6/dist-packages/django/test/client.py", line 286, in get response = self.request(**r) File "/usr/local/lib/python2.6/dist-packages/django/test/client.py", line 230, in request response = self.handler(environ) File "/usr/local/lib/python2.6/dist-packages/django/test/client.py", line 74, in __call__ response = self.get_response(request) File "/usr/local/lib/python2.6/dist-packages/django/core/handlers/base.py", line 143, in get_response return self.handle_uncaught_exception(request, resolver, exc_info) File "/usr/local/lib/python2.6/dist-packages/django/core/handlers/base.py", line 178, in handle_uncaught_exception callback, param_dict = resolver.resolve500() File "/usr/local/lib/python2.6/dist-packages/django/core/urlresolvers.py", line 268, in resolve500 return self._resolve_special('500') File "/usr/local/lib/python2.6/dist-packages/django/core/urlresolvers.py", line 258, in _resolve_special callback = getattr(self.urlconf_module, 'handler%s' % view_type) AttributeError: 'NoneType' object has no attribute 'handler500' The view works in browser. What's wrong with above code?

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