I am working on a Windows Store app. I want to enable "backspace key to navigate back" feature in my app, just like what the native apps do (Travel, News and etc.) Any idea about how to implement this? Should I have a listener capturing all keyboard inputs?
Listen for the KeyUp event. If you use one of the standard template, the the main Grid is a good place to attach the handler.
if (e.Key == Windows.System.VirtualKey.Back)
{
GoBack(sender, e);
}
This is my implementation, which works well!
if (e.Key == Windows.System.VirtualKey.Back && !e.OriginalSource.GetType().Equals(typeof(TextBox)))
{
GoBack(sender, e);
}
Related
i am trying to put logic when user close the browser/tab then i need to clear the local session. so i have used beforeunload event. The problem is that it's getting called on both browser close as well as on page refresh. and i don't have to clear session on refresh it should be on close.
i tried to check only by using clientY and pageY but it's not working for me.
also i tried with the below code to identify browser is going to refresh or not and set the flag value and use it in beforeunload event. but it's getting called after beforeunload event
this.subscription = this.router.events.subscribe((event) => {
if (event instanceof NavigationStart) {
this.browserRefresh = !this.router.navigated;
if(this.browserRefresh)
{
console.log("browserRefresh");
}
else
{
console.log(" else browserRefresh");
}
}
});
#HostListener('window:beforeunload', ['$event'])
beforeunload($event) {
console.log("clear session");
}
Please suggest if i am using wrong event for the task or suggest me the correct way to this. i checked few links suggested but nothing is helping.
Thanks
You can try like this Hope so it can work
#HostListener('window:unload', ['$event'])
beforeunload($event) {
console.log("clear session");
}
i have run into a problem, that my app sometimes Activates and sometimes Launches when i open something via:
var options = new Windows.System.LauncherOptions();
options.DisplayApplicationPicker = false;
bool success = await Windows.System.Launcher.LaunchFileAsync(sampleFile, options);
When app re-activates it shows the same window - when i went to an external app using LaunchFileAsync - this is nice.
But sometimes the app launches, i see a SplashPage and app is beginning from the MainPage. - how can i make this also to return to the page, that i left when used LaunchFileAsync?
Example:
I have a MainPage and a BlankPage1
So here is my page on suspend+shutdown (terminate) 8 buttons:
On Restore 0 buttons, I WANT TO SAVE MY VIEW XAML CODE when app gets killed by system:
It depends entirely on the conditions of your application shutdown. Was it suspended and terminated automatically by the OS ? or did you close it yourself ? (ex : ALT-F4)
You can see here the application lifecyle : http://msdn.microsoft.com/en-us/library/windows/apps/hh464925.aspx
If you want your application to restore its previous state on a user shutdown, I think you can enable it on your OnLaunched method in you App.xaml.cs :
if (args.PreviousExecutionState == ApplicationExecutionState.Terminated
|| args.PreviousExecutionState == ApplicationExecutionState.ClosedByUser)
{
try
{
await SuspensionManager.RestoreAsync();
}
catch (SuspensionManagerException)
{
}
}
Then, if your Page extends LayoutAwarePage, you have two methods, SaveState and LoadState.
These methods are called automatically when navigating from or to the frame (including suspending/restoring/opening...).
If you save your data behind your buttons in your SaveState method, you can restore it in the LoadState method (and thus redraw your buttons). There is a detailled exemple here : http://msdn.microsoft.com/en-us/library/windows/apps/hh986968.aspx
I have the following setup:
Bluetooth scanner
iPad
Webpage with a textfield for scan input
Usage:
User focus textfield and scan barcode with bluetooth scanner
Scanner adds ENTER (13) at the end of the scan
Problem:
On Safari in IOS7 there seems to be a change on how keyboard events are handled on bluetooth devices.
The code ...
window.onkeyup = function (e) {
console.log(e.KeyboardEvent)
}
... should return information about the key pressed. Instead i get ...
keyCode: 0
keyIdentifier: "Unidentified"
... no matter which key I press.
Same result booth form bluetooth scanner and bluetooth keyboard.
Thanks / E
Seems that "onkeypress" works as expected though.
Since this was a problem a bumbed in to in a Sencha Touch project and Sencha Touch doesn't have a keypress event on textfields I'm posting the code that solved my problem.
{
xtype:'searchfield',
name:'search',
placeHolder:'search',
listeners: {
painted: {
fn: function () {
var me = this;
me.element.dom.onkeypress = function (e) {
if (e.keyCode === 13) {
me.fireEvent('searchkeypress', me, e);
}
};
}
}
}
}
I faced a similar problem #EmilPennlov. I was able to solve this by using a $watch on the input field. Worked like a charm.
I noticed cordovaInitCallback is called each time Worklight/Cordova is initialized in an Android app. In particular, it calls Cordova's "clearHistory" to wipe out the WebView history. This has been an issue when I try to make use of window.history in a multi-page app since the history is always reset during the initializtion from page to page.
Since the comment suggests that the purpose for this clearHistory call is to prevent going back to an old page in a direct update scenario, could the condition be strengthened over an Android environment check so that it is only called if a direct update has just taken place? One case, for example, I can think of is when connectOnStartup=false, then direct update would not occur.
wlclient.js:
var cordovaInitCallback = function(returnedData) {
onEnvInit(options);
if (WL.Client.getEnvironment() == WL.Env.ANDROID) {
if (returnedData !== null && returnedData !== "") {
WL.StaticAppProps.APP_VERSION = returnedData;
}
// In development mode, the application has a settings
// widget in which the user may alter
// the application's root url
// and here the application reads this url, and replaces the
// static prop
// WL.StaticAppProps.WORKLIGHT_ROOT_URL
// __setWLServerAddress for iOS is called within
// wlgap.ios.js's wlCheckReachability
// function because it is an asynchronous call.
// Only in Android we should clear the history of the
// WebView, otherwise when user will
// press the back button after upgrade he will return to the
// html page before the upgrade
if (**WL.Env.ANDROID == getEnv()**) {
cordova.exec(null, null, 'Utils', 'clearHistory', []);
}
}
I am currently using Worklight 5.0.5, and have checked this same condition exists in 5.0.5.1.
Thanks!
The architectural design of Worklight is SPA (Single Page Application).
cordovaInitCallback should be called only once in the life cycle of the application.
That said, you can, if you wish, override it.
I have a Windows Store app with Live Tile updates using Background Task. When I activate the app by any means (click on the live tile, switch back to the app, etc..) I want to clear the live tile (I have a number there that I want to change to zero).
To be more concerete, I run the app, I switch to another app or desktop, then I switch ti the star screen and I see a number on the Live Tile. I click the Live Tile, I am taken to the app and I want the Live Tile to clear. The same functionality as the Email app.
I tried the OnActivated method in App.xaml.cs but it does not seem to get called at any time (I put a throw new NotImplementeExeption there and the app never crashes).
You should put it in the OnLaunched method, you just need to determine where.
protected async override void OnLaunched(LaunchActivatedEventArgs args)
{
var rootFrame = new Frame();
// Do not repeat app initialization when already running, just ensure that
// the window is active
if (args.PreviousExecutionState == ApplicationExecutionState.Running)
{
//....
}
if (args.PreviousExecutionState == ApplicationExecutionState.ClosedByUser)
{
/....
}
if (!String.IsNullOrEmpty(args.Arguments))
{
//....
}
if (args.PreviousExecutionState == ApplicationExecutionState.Terminated)
{
//....
}
if (args.PreviousExecutionState == ApplicationExecutionState.NotRunning)
{
//.....
}
TileUpdateManager.CreateTileUpdaterForApplication().Clear();
BadgeUpdateManager.CreateBadgeUpdaterForApplication().Clear();
SettingsPane.GetForCurrentView().CommandsRequested += OnCommandsRequested;
// Create a Frame to act navigation context and navigate to the first page
if (!rootFrame.Navigate(typeof(MainPage)))
{
throw new Exception("Failed to create initial page");
}
// Place the frame in the current Window and ensure that it is active
Window.Current.Content = rootFrame;
Window.Current.Activate();
}
If you look at the code, there are several reasons of why your App is closed/suspended. So, determine in which cases you want to run de code for updating the number in the Live Tile, put it inside that if, and it should work.
I guess that the better place for such actions is the OnLaunched method. It called every time you appication start.
update: Hmm, seems you should react on both OnActivated and OnLaunched methods:
OnLaunched - Invoked when the application is launched. Override this
method to perform application initialization and to display initial
content in the associated Window.
On the application start OnLaunched will be called. But when you switch to another app and then go back OnActivated should be called:
OnActivated - Invoked when the application is activated by some means other than normal launching.