We Keep Coding

How can I show a confirm dialog with Vaadin 23 when the user clicks on back button?

how can I show a dialog to stay or leave the current page with Vaadin 23, when a user clicks back button on browser?
Regards

It depends what you wish to achieve.
See this older discussion: Vaadin onbeforeunload event
Generally: use the onBeforeUnload javascript even for this
https://www.w3schools.com/tags/ev_onbeforeunload.asp
This is executed when the user would go away from your vaadin app, but not when using the back button inside your vaadin app.
For these you can use the navigation lifecycle events as documented here
https://vaadin.com/docs/latest/routing/lifecycle
Not sure if it also catches, when a user leaves your app...

Assuming you mean, that is it possible to prevent the navigation happening, you simply can't do that. If disabling back button is important for you, the only way is to enforce your users to use the application via desktop shortcut which starts the app using --app paramater (if using Chrome). This is not a limitation in Vaadin, but a general restriction in browser behavior.

There is already a possibility to handle Browser Back Button Event on Vaadin (https://vaadin.com/docs/v14/flow/routing/tutorial-routing-lifecycle):
public class SignupForm extends Div implements BeforeLeaveObserver {
#Override
public void beforeLeave(BeforeLeaveEvent event) {
if (this.hasChanges()) {
ContinueNavigationAction action = event.postpone();
ConfirmDialog.build("Are you sure you want"+
" to leave this page?")
.ifAccept(action::proceed)
.show();
}
}
private boolean hasChanges() {
// no-op implementation
return true;
}
}
This code works once but when you click on Cancel on Confirm Dialog so that you want to stay on current page and click again on Back Button on Browser, than you don't see any Confirm Dialog again... I can not understand, why...

Is it OK to include Java Swing with JSP?

I tried using Swing code in a JSP page. To my surprise it does work well and fine.
But I cannot judge if it is OK to use Swing with JSP?
Basically I want to display some pop up reports from Database. I was thinking to display a JFrame pop up/ applet to do the trick.
But do a web browser require any additional plugin for this?
Or is it fine to do such a thingy? Any guidance will be helpful.

Always remember that every java fragment you insert into your JSP is executed server-side, so it can be deceitful (it may seem to work in your development local machine, but it is only because the server and the client side are running on the same box).
The proper way to do this would be to write an Applet and include it into your page - this way, the browser will download it to client side and run it there. You should subclass JApplet (http://docs.oracle.com/javase/8/docs/api/javax/swing/JApplet.html) and then you will be able to use Swing components at will

The library works but your controls will never be shown at the client side (browser) but at the server (if it is that you have a working window service: Ms Windows, X11, Xorg,...).
I don't think that is a good practice and I would only use Swing library classes not to show GUI components but to use some classes to store special objects such as ImageIcon to store icons. But never to try to paint them.
I have a project where I use JLaTeXMath to generate a PNG within a JSP representing some math equations, in this context, I use javax.swing.JLabel to generate the image:
TeXFormula formula = new TeXFormula(texCode);
TeXIcon texImg = formula.createTeXIcon(TeXConstants.STYLE_DISPLAY, 25);
BufferedImage img = new BufferedImage(texImg.getIconWidth(), texImg.getIconHeight(),
BufferedImage.TYPE_4BYTE_ABGR);
texImg.paintIcon(new JLabel(),img.getGraphics(), 0, 0);
try {
OutputStream os = res.getOutputStream();
res.setContentType("image/png");
ImageIO.write(img, "png", os);
os.close();
res.flushBuffer();
} catch (Exception ex) {
log.warn("LaTeX renderer: " + ex.toString() + "\t" + "Msg: " + ex.getMessage());
return;
}

the JSP would run on the server,and probably display the GUI there,
but why would you want that? In the meantime, the person at the client
who submitted the request would be sitting there waiting for somebody
at the server end to close the Swing window so the JSP could get on
with its work.
So i would say that it is not feasible.

How can I detect a close in the browser tab?

Hello I am looking for information on the close tab (not browser) event if there is one in java for a applet. I am wondering if there is an event for that or a way to check a way to check for that. I would like to just capture the event and make a little popup box , stating Your session will expire or something along those lines. Is that possible at all or to a point with java or Javascript?
UPDATE: okay with the information you guys pointed me into i was able to get information on a simple enough javascript. Now it is working fine in IE , Chrome and Firefox but for some reason Safari 5.1.7 isn't liking the code. Not sure why. Here is the code if it helps.
jQuery(function() {
var hiddenBtn = document.getElementById("javaform:browserCloseSubmit");
try{
opera.setOverrideHistoryNavigationMode('compatible');
history.navigationMode = 'compatible';
}catch(e){}
//Sends the information to the javaBean.java file.
function ReturnMessage()
{
return hiddenBtn.click();
}
//UnBind Function
function UnBindWindow()
{
jQuery(window).unbind('beforeunload', ReturnMessage);
}
//Bind Exit Message Dialogue
jQuery(window).bind('beforeunload', ReturnMessage);
});

You have the onBeforeUnload event you can catch in JavaScript. See here.

Use window.onbeforeunload
window.onbeforeunload = function () {
return "Are you sure you want to exit?";
};
Note that it will also end in Are you sure you want to leave this page (or are you sure you want to reload this page if you are reloading)

Open and maximise a browser window in OATS Java (not javascript)

I am a tester and just installed oracle application test suite to use testing eBus apps
Anyway the only language it supports for coding test scripts (I don't want to use the recorder for a number of reasons). The problem I am having is that everything I search or google is javascript not java (even googling with -script I still ended up looking at javascript. This just gets rejected by the oats editor
The only other examples I have seen, appear to be defining a variable then setting the value of that variable as the window they want to maximize. Aside from the fact that my java skills are not up to doing that - I do not need to do this for a newly opened browser window do I? (The assumption is that this will be the only browser window open (ie test is executed with browser closed)
Is there any easy way to do this?
Below is the very simple initiate of the browser which is generated from a recording plus part of the first step which loads the url the test starts at: (I realize the first step is not complete below -I didn't paste it all, just enough to hopefully allow someone to show me what I need to edit to force the browser to load maximized, or maximize it immediately after loading?
public void initialize() throws Exception {
browser.launch();
}
/**
* Add code to be executed each iteration for this virtual user.
*/
public void run() throws Exception {
beginStep("[1] Login (/RF.jsp)", 0);
{
web
.window(2,
"/web:window[#index='0' or #title='about:blank']")
.navigate(
"http://somepageiwantolaunch");
web.window(4, "/web:window[#index='0' or #title='Login']")
.waitForPage(null);

I am not sure whether you already got the answer for this.. if not this code should help you
browser.launch();
DOMBrowser currentExecutionBrowser = web.window("/web:window[#index='0' or #index='1']");
currentExecutionBrowser.maximize();
Let me know if this helps!

There is a function in the Oracle Functional Tester API Reference which has a build in function called object.WindowState It says you can get or set using this function and it has values
0 - Normal, 1- minimized and 2-maximised.
Only issue is that these examples look more like VB than Javascript but presumably there is a similar function built into to the Oracle libraries for Java.
I did a quick search for Oracle Openscript API and came up with this link which asks for the same thing. They suggest using Help->Search from within the openscript application and then searching for "openscript API" which should provide a list of the functions available.
Hope that helps.

To Maximize browser in OATS, follow the below code
Open script ha in built methods which helps coding easy
browser.launch();
web.window(12, "/web:window[#index='0' or #title='about:blank']").navigate("http://www.google.com/");
web.window(12, "/web:window[#index='0' or #title='about:blank']").maximize();
for more OATS Tips/Tricks follow here
http://www.testinghive.com/category/oracle-application-testing-suite-tips

If it is the only browser window open, you can use the below code. It must be used with caution since the code maximizes any window that is open above the browser window.
try {
Robot a = new Robot();
a.keyPress(KeyEvent.VK_ALT);
a.keyPress(KeyEvent.VK_SPACE);
a.keyRelease(KeyEvent.VK_SPACE);
a.keyRelease(KeyEvent.VK_ALT);
a.keyPress(KeyEvent.VK_X);
a.keyRelease(KeyEvent.VK_X);
} catch (AWTException e) {
}

JEditorPane can't take Google search queries, why?

I am creating a very basic web browser using JEditorPane just to teach myself Swing and GUIs in Java but am having trouble implementing a Firefox-like Google Search bar.
I'm not if it's due to a limitation of JEditorPane or my lack of understanding but if I try and take the string typed into the "Google Search" bar and use the setPage() method of JEditorPane, it doesn't work.
Here is my code for the ActionListener of the "Google Search" button:
public void actionPerformed(ActionEvent arg0)
{
try
{
content.setPage("http://www.google.com/search?q=" + searchBar.getText());
}
catch (IOException e)
{
JOptionPane.showMessageDialog(frame, "Error searching for: " + searchBar.getText());
}
}
Even when I try and just do content.setPage("http://www.google.com/search?p=test"); it doesnt work, so is it something to do with setPage()'s way of taking the URL string? As in it doesn't like the "?" or "=" characters or is there another way of doing it all together?
Thanks for your time,
InfinitiFizz

Add something to print the exception you are catching and you'll see that you're receiving a 403 Forbidden from Google.
There are a lot of Java bots out there and sites have started blocking requests with "java" in the User-agent field. Google will let you get their home page, but won't let you search unless you override the User-agent field.
Start your jvm with -Dhttp.agent=myappname/1.0 where myappname is the name of your application.

JEditorPane is a poor choice to implement even the simplest browser. It works to display simple HTML pages but it stops there.
Try The Flying Saucer Project, it works pretty well(it's not a full browser, but close enough).They have an example which simulates actually a web browser.

Like adrian.tarau said, JEditorPane is very poor at displaying modern web pages.
It doesn't even support HTML 4 or Javascript. I believe Google uses Javascript to make the Search button work.
Another suggestion would be to use the Lobo Browser/Cobra engine.

If you need a full browser in Java check out Lobo:
http://lobobrowser.org/java-browser.jsp