Context: In a Vaadin 23 application there is a form that is reachable directly via URL. It registers a BeforeLeaveListener with UI.getCurrent().addBeforeLeaveListener(bll);. The implementation of the BeforeLeaveListener is this:
#Override
public void beforeLeave(BeforeLeaveEvent event) {
ContinueNavigationAction action = event.postpone();
askAndProceedIfOk(() -> {action.proceed();});
}
It explicitly postpones the BeforeLeaveEvent and explicitly proceeds the event.
In the application there's a second form that is opened in a modal dialog with the option to close it.
Dialog modalDialog = new Dialog();
modalDialog.setCloseOnEsc(true);
modalDialog.setCloseOnOutsideClick(true);
modalDialog.setModal(true);
The BeforeLeaveListener doesn't work here, but a ComponentEventListener<Dialog.DialogCloseActionEvent> does:
modalDialog.addDialogCloseActionListener(new ComponentEventListener<Dialog.DialogCloseActionEvent>() {
#Override
public void onComponentEvent(Dialog.DialogCloseActionEvent event) {
myForm.askAndProceedIfOk(() -> {modalDialog.close();});
}
});
Surprise: I am surprised that BeforeLeaveEvent and DialogCloseActionEvent work different:
BeforeLeaveEvent offers postpone() and proceed()
DialogCloseActionEvent seems to be implicitly postponed just by showing another modal Dialog that asks the user whether to save unsaved changes. And I do have to close the modal dialog explicitly.
Question: Is it right that both events (with a similar task) work that different or do I miss some details here?
How can I change favicon of my pages in Vaadin ? I would like to change favicon of my pages but I have no idea where is the place to change it ? Has somebody experience on it ?
First, create a theme directory: /WebContent/VAADIN/themes/mynewtheme
Then, put your custom favicon.ico in this directory. You also need to set theme property in your application :
public class MyNewApplication extends Application {
#Override
public void init() {
...
...
setTheme("mynewtheme");
}
}
Here is a more detailed version of the similar Answer posted by Greg Ballot. My Answer here relates to Vaadin 7, current as of 7.5.3.
Custom Theme
In Vaadin 7.5, you can drop your favicon graphics image file into your own custom theme. If using the Vaadin plugin for various IDEs (NetBeans, Eclipse) or the Maven archetypes, a custom theme named mytheme should have already been created for you. Drop your image file into that mytheme folder.
The main part of your Vaadin 7 app, your subclass of UI, must specify that it uses your custom theme. Again, if using the IDE plugins and/or Maven archetype, this should have already been configured for you. The easiest way is an Java Annotation on the UI subclass.
#Theme ( "mytheme" ) // Tell Vaadin to apply your custom theme, usually a subclass of the Valo or Reindeer theme.
#Title ( "PowerWrangler" ) // Statically specify the title to appear in web browser window/tab.
#SuppressWarnings ( "serial" ) // If not serializing such as "sticky sessions" and such, disable compiler warnings about serialization.
#Push ( PushMode.AUTOMATIC ) // If using Push technology.
public class MyVaadinUI extends UI
{
…
Favicon Usage/Behavior Not Standard
Remember that favicon behavior is not standardized. Favicons developed haphazardly, mostly out of a sense of fun. The exact behavior depends on the particular browser and particular server. Other than the particular folder location, none of this is special to Vaadin.
Image File Formats
Originally the ICO file format was used exclusively. Since then most browsers have evolved to accept any of several formats including JPEG, TIFF, and PNG.
Image Size/Resolution
Originally favicons were intended to be very small bitmap icons. Some browsers have made various uses of the favicon in situations where you may want to provide a higher-resolution image. But remember that smaller files load faster without keeping your users waiting.
Favicon File Name
Some browsers or servers may handle other file names or name extensions, but I've found it easiest to name my file exactly favicon.ico -- even if using a different format! I usually use a PNG file but name it with the .ico extension. While I cannot guarantee this practice works one every server and browser, I’ve not encountered any problem.
Existing Favicon File
Recent versions of Vaadin have included a Vaadin-related icon in a favicon.ico file in a configured project. So you must replace that file with your own. In Vaadin 7.5.3 the file contains four sizes, the largest looking like this:
Older versions did not add a file, so you drop in your own.
IDE Screen Shots
Here are a pair of screen shots. One is the project (logical) view in NetBeans 8, while the other is a files (physical) view.
In case of custom icon name (Vaadin 7):
public class MyServlet extends VaadinServlet implements SessionInitListener {
#Override
protected void servletInitialized() throws ServletException {
super.servletInitialized();
getService().addSessionInitListener(this);
}
#Override
public void sessionInit(SessionInitEvent event) throws ServiceException {
event.getSession().addBootstrapListener(new BootstrapListener() {
#Override
public void modifyBootstrapPage(BootstrapPageResponse response) {
response.getDocument().head()
.getElementsByAttributeValue("rel", "shortcut icon")
.attr("href", "./VAADIN/themes/mynewtheme/custom.ico");
response.getDocument().head()
.getElementsByAttributeValue("rel", "icon")
.attr("href", "./VAADIN/themes/mynewtheme/custom.ico");
}
#Override
public void modifyBootstrapFragment(BootstrapFragmentResponse response) {
}
});
}
}
EDIT
It is better to use the BootstrapListener as a static nested class: link
Vaadin 23.x (plain spring/war application, no springboot!):
Derive an implementation of com.vaadin.flow.component.page.AppShellConfigurator:
#Theme(value = "mytheme")
#PWA(name = "My application", shortName = "MyApp", iconPath = "icons/favicon.ico" )
public class AppShellConfiguratiorImpl implements AppShellConfigurator {
#Override
public void configurePage(AppShellSettings settings) {
settings.addFavIcon("icon", "icons/favicon.ico", "16x16");
}
}
And put your favicon.ico into src\main\webapp\icons (in order that it is encluded in <war-root>/icons/favicon.ico)
A servlet container (3.0 plus, e.g. Tomcat 8.5) will pick up this class automagically and load it.
I'm relatively new to codename one. I'm trying to read text from a pure text url and store the text in a string. I tried using the java IO package but for some reason it doesn't seem to wirk with codename one. Please help.
David.
I think you might not really understand codenameone seeing as you tried to use the Java IO package. But anyway, this code might get you along
ConnectionRequest r = new ConnectionRequest();
r.setUrl("YOURURLHERE");
r.setPost(false);
r.addResponseListener(new ActionListener()
{
public void actionPerformed(ActionEvent ev)
{
try
{
NetworkEvent event = (NetworkEvent) ev;
byte[] data= (byte[]) event.getMetaData();
String decodedData = new String(data,"UTF-8");
System.out.println(decodedData);
} catch (Exception ex)
{
ex.printStackTrace();
}
}
});
NetworkManager.getInstance().addToQueue(r);
NOTE: Instead of using System.out.println, which works fine for debugging purposes, you probably want to add the text to your application with a GUI component. I'm not sure if this needs to be said, but it won't do any harm stating it again :)
I've been trying to find a line and print it out on this website: http://www.easports.com/player-hub/360/Its+McDoom
Right now it prints out everything on the website, but I cannot find the line I am looking for. I am trying to print out "H2h Skill Points: 1053", but I cannot find anything like that in the console.
I only really want it to print that 1 line, not the whole thing, but I can't even find it.
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.URL;
import java.net.URLConnection;
public class ElectronicArtsStatHub {
/**
* #param args
*/
public static void main (String[] args) throws Exception{
URL oracle = new URL("http://www.easports.com/player-hub/360/Its+McDoom");
URLConnection yc = oracle.openConnection();
BufferedReader in = new BufferedReader(new InputStreamReader(
yc.getInputStream()));
String inputLine;
while ((inputLine = in.readLine()) != null) {
System.out.println(inputLine);
}
in.close();
}
}
The first problem is that the information your trying to find isn't actually in the data you are currently outputting.
When you open the page in your browser you get the main page elements but then your browser then runs some Javascript code which presumably uses AJAX to get the stats and fill in the table.
The URLConnection receives the same data that your browser initially does and does not execute the Javascript so if you check your output that data your looking for isn't actually there at all.
Possible solutions include finding a different source for this data or executing the Javascript in Java possibly by using HTMLUnit
There may be some helpful infomation on this related question
I found this code, which I guess is for the java file, but does that actually display it, or how do I do the XML? And does Blackberry have a nice GUI for the BB UI yet?
import net.rim.device.api.browser.field2.*;
import net.rim.device.api.ui.*;
import net.rim.device.api.ui.container.*;
public class BrowserFieldDemo extends UiApplication
{
public static void main(String[] args)
{
BrowserFieldDemo app = new BrowserFieldDemo();
app.enterEventDispatcher();
}
public BrowserFieldDemo()
{
pushScreen(new BrowserFieldDemoScreen());
}
}
class BrowserFieldDemoScreen extends MainScreen
{
public BrowserFieldDemoScreen()
{
BrowserFieldConfig myBrowserFieldConfig = new BrowserFieldConfig();
myBrowserFieldConfig.setProperty(BrowserFieldConfig.NAVIGATION_MODE,BrowserFieldConfig.NAVIGATION_MODE_POINTER);
BrowserField browserField = new BrowserField(myBrowserFieldConfig);
add(browserField);
browserField.requestContent("http://www.blackberry.com");
}
}
I got the code from this page
My end-game is to have a web-based app using HTML5 since BB is a b*tch to program. I figure the HTML is super easy, and this way I just have to figure out how to show a webpage. Is there any reason I should not attempt this method?
I found this code, which I guess is for the java file...
Yes
but does that actually display it?
Yes. Why not?
...or how do I do the xml?
Don't get it
And does blackberry have a nice GUI for the BB UI yet?
No. I use BB plugin for Eclipse and it is not hard
My end-game is to have a web-based app using HTML5
Good solution but depends on the app you are trying to develop
...since BB is a b*tch to program
Don't think so
I figure the HTML is super easy, and this way I just have to figure
out how to show a webpage. Is there any reason I should not attempt
this method?
It's good if you want to develop for multiple platforms but you are not going to be able to create an app that is as powerfull as a native one
HTML5 webapp is the best solution since not all BBs use the same code