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Prevent JavaFX dialog from closing

I'm currently creating a dialog using JavaFX. The Dialog it self works very well but now I'm trying to add an input validation which warns the user when he forgets to fill out a text field.
And here comes my question: Is it possible to prevent the dialog from closing inside the Result Converter? Like this:
ButtonType buttonTypeOk = new ButtonType("Okay", ButtonData.OK_DONE);
dialog.getDialogPane().getButtonTypes().add(buttonTypeOk);
dialog.setResultConverter((ButtonType param) -> {
if (valid()) {
return ...
} else {
Alert alert = new Alert(Alert.AlertType.WARNING);
alert.setHeaderText("Pleas fill all fields!");
alert.showAndWait();
//prevent dialog from closing
}
});
I noticed that the dialog dosn't close if an error was thrown inside the resault converter but this doesn't seems to be a good way to solve this problem.
If it isn't possible to solve the problem this way I could disable the button as described in this post. But I would prefer to keep the button enabled and display a message.
Thank you in advance !

How you are supposed to manage data validation in a dialog is actually explained in the Javadoc, I quote:
Dialog Validation / Intercepting Button Actions
In some circumstances it is desirable to prevent a dialog from closing
until some aspect of the dialog becomes internally consistent (e.g. a
form inside the dialog has all fields in a valid state). To do this,
users of the dialogs API should become familiar with the
DialogPane.lookupButton(ButtonType) method. By passing in a ButtonType
(that has already been set in the button types list), users will be
returned a Node that is typically of type Button (but this depends on
if the DialogPane.createButton(ButtonType) method has been
overridden). With this button, users may add an event filter that is
called before the button does its usual event handling, and as such
users may prevent the event handling by consuming the event. Here's a
simplified example:
final Button btOk = (Button) dlg.getDialogPane().lookupButton(ButtonType.OK);
btOk.addEventFilter(
ActionEvent.ACTION,
event -> {
// Check whether some conditions are fulfilled
if (!validateAndStore()) {
// The conditions are not fulfilled so we consume the event
// to prevent the dialog to close
event.consume();
}
}
);
In other words, you are supposed to add an event filter to your button to consume the event in case the requirements are not fulfilled which will prevent the dialog to be closed.
More details here

One other way to solve this is by using setOnCloseRequest if you don't want to relay only on the user clicking the "Okay" button. The event handler will be called when there is an external request to close the Dialog. Then the event handler can prevent dialog closing by consuming the received event.
setOnCloseRequest(e ->{
if(!valid()) {
e.consume();
}
});

Selenium Webdriver : Dismiss Chrome Alert

I want to select the check box Prevent this page from creating additional dialogs before selecting ok to close the alert
Currently i am using
Alert alert=driver.switchTo().alert();
//check the checkbox
alert.accept();
As an normal interactive user to check the check box i have to use a combination of <Tab> + <Space/Enter> keys. The <Tab> shifts the focus to the check-box and the <Space/Enter> checks the check-box.
Solutions Tried
I tried using Java sendKeys mechanisms ( Robot class, driver.sendKeys(), etc.), but an UnhandledAlertException is getting thrown.
I tried using alert.sendKeys which is different from driver.sendKeys() but it too failed
//check the checkbox
alert.sendKeys("\t");
alert.sendKeys("{TAB}");
alert.sendKeys("\uE004");
alert.sendKeys("\\U+0009");
alert.sendKeys(Integer.toString(KeyEvent.VK_TAB));
I am trying to avoid robot class as much as possible as i need to run the test in grid in which case robot class will not work.Any pointers on how to send keys to the alert window ?
Temporarily i could do it using a javascript window.alert = function() {}; by simply overriding the alert with an empty function just curious to know if it could be done with webdriver functions like alert.sendkeys or any other methods ??
Any help is greatly appreciated!!

Pause Android app-flow

When a return button is pressed in the app I am working on:
public void clickReturn(View view)
{
// ...
// Call an event handler before finishing the activity
_appData.CustomDetail.hookBeforeFinish(this, new ArrayList<CompSubmission>(_submissions));
// Finish this activity
finish();
}
I am not able to modify clickReturn() - the way the application is structured, all I have access to is the hook hookBeforeFinish().
What I want to do is add a dialog to prompt for some input. I can do this in hookBeforeFinish(), but it only appears for a split second. I assume what is happening is I set up the AlertDialog builder, call builder.show() but finish() is being called directly afterwards - so the dialog only appears momentarily.
Is there anything I can put after builder.show() in the hook function such that it won't continue execution to finish()? If I can pause the application flow until someone presses the OK button on the dialog thatwould work better for me.
Thanks

Please comment finish().
Then read and add a dialog as explained here. In your positive button click (e.g. OK button), add finish();
Edit
Since you cannot override clickReturn() or change the class, you can use your hookBeforeFinish() to create a dialog and comment 'clickReturn();' line.
In your dialog, in the listener for the button which expects to finish the activity add clickReturn();.
This way you will pause the activity closing until user decides to do so.

Object not found error on OK button in the dialog box

In my application , by clicking the save button, the dialog prompts a message with OK button. While recording 'the OK button' got recorded and shows 'text_ok().click(atpoint(11,8));'. But during play back it shows me a 'Object not found' error.
Recently updated the RFT Version 8.2.2.1 after this only this issue is seen.
Can anyone say me how to solve this problem or any coding in java.
My regression is waiting due to this, your help is highly appreciable.
Thanks in Advance.

You have not mentioned what type of dialog window it is. But you can try the IWindow API of RFT to find active top window and perform the click as specifed below.
The Following code for eg can handle an alert dialog box in html by calling
handleDialogButton("Message from Webpage", "ok");
Or,to click on canel button on Notepad's Font dialog (Format>Font) by calling
handleDialogButton("font","cancel");
-------Sample code----
/*
* Activates the top window with the given caption and clicks on the child control(window) with the specified text
* #param caption- Caption of the Dialog window
* #param btnToClick- Text of the button(any other control) to click
*/
void handleDialogButton(String caption,String btnToClick)
{
IWindow[] windows = getTopWindows();
for(IWindow window: windows)
{
if(window.getText().equalsIgnoreCase(caption))
{
window.activate();
//window.close(); //we can just close it also n break.
IWindow[] children = window.getChildren(); // OR go thru the children to get the child
for(IWindow child:children)
{
if(child.getText().equalsIgnoreCase(btnToClick))
{
child.click();
break;
}
}
}
}
unregisterAll();
}

From the poing of Selenium Web driver API i recommend you do the following:
Alert alert = driver.switchTo().alert();
alert.accept();
Hope this works for you

In GWT, how to reset the URL when the user hits "Cancel" in the navigation confirmation dialog?

In my GWT application, I want to ask a user confirmation when he navigates out of the current application, i.e. by entering a URL or closing the browser. This is typically done by registering a ClosingHandler and setting the desired dialog message in the onWindowClosing method. This seems to work well.
However, if the user tries to navigate say to http://www.gmail.com (by typing it in the URL bar) and hits Cancel to indicate he doesn't want to navigate, then my app keeps running but the browser's URL bar keeps indicating http://www.gmail.com. This causes a number of problems later in my application and will give the wrong result if the user bookmarks the page.
Is there a way to automatically reset the URL when the user presses Cancel?
Or, alternatively, is there a way to detect the user pressed the Cancel button? If so, is there a way to set the URL without triggering a ValueChangeEvent? (I could add some logic to prevent this, but I'd rather use a built-in mechanism if it exists.)

Not sure if this works but did you try: History.newItem(History.getToken(), false); to reset the URL? It does set the history token without triggering a new history item.

I managed to do this. It looks like GWT DeferredCommand are executed after the confirmation window has been closed. This, combined with Hilbrand's answer above, give me exactly what I want. Here is exactly what I do:
public final void onWindowClosing(Window.ClosingEvent event) {
event.setMessage(onLeaveQuestion);
DeferredCommand.addCommand( new Command() {
public void execute() {
Window.Location.replace(currentLocation);
}
});
}
Where currentLocation is obtained by calling Window.Location.getHref() every time the history token changes.

I solved this by creating a custom PlaceController and replacing the token in the url. Not an ideal solution but it works!
if (warning == null || Window.confirm(warning)) {
where = newPlace;
eventBus.fireEvent(new PlaceChangeEvent(newPlace));
currentToken = History.getToken();
} else {
// update the url when user clicks cancel in confirm popup.
History.replaceItem(currentToken, false);
}