Passing information between scenes with javafx

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A window listener can be used for a variety of reasons. For example, if you want to perform an action before the user closes the application, such as saving data to a file. You can also use a window listener to pass data back and forth from one window to another. In a more complex application, you can use window listeners to terminate certain processes while a window is minimized, and then restart those processes when the window becomes maximized, which can result in huge resource savings.

You can use a regular EventHandler to handle window events. The WindowEvent class is the event object that is fired when window events are triggered. The WindowEvent class contains a set of EventType constants that are used to identify the kind of action that was triggered:. You can register a Stage object e.

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To see how window events work, create a simple UI program with an Exit button. We'll add an event handler to this button later. In each event handler, write a line of text to the console with the type of event being executed.

For example:. This demonstrates that the onShowing event occurs right before the onShown event. Keep this in mind when you want to write code for these two events; code in your onShowing event will occur before your onShown event code. The onShown event is a good place to put code that needs to access components on the UI. For example, recall that if we want to set the focus to a control on startup, we had to use Platform.

Add a text field above your button and make sure you add it to the UI before you add the button. Give your text field some prompt text anything is fine. When you start the program, you won't see the prompt text because the text field receives the focus automatically on startup. Go to your onShown event and set the focus to the Exit button, then try the program again.

The focus ends up on the button on startup, and you didn't have to use a thread to do it! The onCloseRequest event occurs only when a request is made to close the window. This can happen when the user exits the program Clicking the Close button in the top-right corner, using Alt-F4, etc. Run the program: What happens when you press the close X button on the UI? The dialog box appears and you should see your text in the console if you left the System. You can cancel the request to close the window by using the event.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

Code Review Stack Exchange is a question and answer site for peer programmer code reviews. It only takes a minute to sign up. I am working in JavaFX and I created util class which is responsible for creating new window.

I called this class WindowUtil. Depending on the button that was clicked I want to:. The problem is that code responsible for opening a new window is always the same among overloaded methods so I'd like to somehow write this code only once.

You correctly identified the part that differs among these methods, so next step is to exclude this part. Its role is to initialize the Parent instance to be set on subWindow. This instance can just be passed as argument to the extracted method:. Now you need just to instantiate parent s respectively and call loadWindowAndSendData with them.

Basically, the only difference is, that one time you use the controller for something and the other time you don't.

passing information between scenes with javafx

Not knowing what the controller does with the connection data makes it a bit difficult, but if it is equivalent to call controller. Or going back to principles: separation of concerns: load the window, return the controller is enough for a single method.

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Init data seems not to belong in there. Sign up to join this community. The best answers are voted up and rise to the top. Home Questions Tags Users Unanswered. JavaFX utility functions to load window and send data to a controller Ask Question. Asked 3 years, 3 months ago. Active 3 years, 3 months ago. Viewed 4k times. Depending on the button that was clicked I want to: Open new window Send some data to controller of this window this is optional The problem is that code responsible for opening a new window is always the same among overloaded methods so I'd like to somehow write this code only once.

Below I present these methods.

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Some of them are overloaded and some of them are not. Active Oldest Votes. Antot Antot 3, 1 1 gold badge 7 7 silver badges 16 16 bronze badges.

passing information between scenes with javafx

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passing information between scenes with javafx

Tales from documentation: Write for your clueless users. Podcast a conversation on diversity and representation. Featured on Meta. Feedback post: New moderator reinstatement and appeal process revisions.I have one fxml file controlled by one controller. I want to separate the controller into multiple parts as if placed in one controller makes a long code.

Unfortunately, fx:controller can only be placed in the root. Are there any suggestions for me how to separate the controller? During the loading of your FXML markup, there is only the provision to have one controller specified for your scene graph.

You are able to load other FXML markup files and nest controllers, but I don't think that's what you're asking. You can write any number of classes in any number of files and have them interact with your controller class just like any Java class can interact with any other Java class. I really can't think of any particularly good reason why it would be useful to specify multiple controllers for a scene graph at load time. The constructor is getting called before the menuBar is getting set, so MenuController should use initalize method from Initalizable interface.

Fixed MenuController:. To my mind, it doesn't matter anyway. JavaFX: How to split menu controller? Fixed MenuController: package controllers. FXML ; import javafx. Initializable ; import javafx. MenuBar ; import java. URL ; import java. Can I add jars to maven 2 build classpath without installing them?

JavaFX Communication Between Controllers

How to create multiple javafx controllers with different fxml files?Most of programs in this world would need to pass different data and arguments between the different layouts and screens, so we will explain the easiest way to have this done in JavaFX in this tutorial. Our program will open our main java class which request layout1 with its controller controller1 to be displayed, so we will keep the default codes in our main. We will have a textfield and a button in layout1, and we want to display layout2 with a label of the text that was entered in this textfiled after the button is clicked in layout1.

Till here we are done with how to pass values, but what if we wanted to send some data back to layout1 without reloading the same layout? We can do this easily with following approach:. We will need to pass the textfield as an argument when we call setLabelText within controller1 :. Now, we can update or do what we want with the new textfield inside controller2 and the same updates will be applied on the passed textfield.

Author Jagar. LastMod Structure In our demonstration, we will create the following files: Main. Author Jagar LastMod GitHub is home to over 50 million developers working together to host and review code, manage projects, and build software together.

If nothing happens, download GitHub Desktop and try again. If nothing happens, download Xcode and try again. If nothing happens, download the GitHub extension for Visual Studio and try again.

You can switch between your scenes from anywhere through a simple method, without worrying about annoying Stage settings. Define your Application routes with a label identifier and its corresponding. Skip to content. Dismiss Join GitHub today GitHub is home to over 50 million developers working together to host and review code, manage projects, and build software together. Sign up. Branch: master.

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Go back. Launching Xcode If nothing happens, download Xcode and try again. Latest commit. Marcotrombino committed b27e Dec 28, Fixed readme. Git stats 9 commits 1 branch 2 tags. Failed to load latest commit information. View code. Usage 1. Bind Add FXRouter as project dependency and import it from its package: import com. FXRouter.

Application ; import javafx. FXMLLoader ; import javafx. Parent ; import javafx. Scene ; import javafx. Stage ; import sample. About A simple JavaFX router to switch between application scenes Topics javafx javafx-library javafx-multiple-scenes java-gui-application. Releases 2 Java 8 support Latest. Dec 28, You signed in with another tab or window.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

Game Development Stack Exchange is a question and answer site for professional and independent game developers. It only takes a minute to sign up. I am developing my first 2D game in Unity and I have come across what seems an important question. Someone mention using PlayerPrefswhile other people told me this should be used to store other things like screen brightness and so on.

Someone told me that the best way was to make sure to write everything into a savegame everytime that I changed scenes, and to make sure that when the new scene loads, get the info from the savegame again. This seemed to me wasteful in performance.

Was I wrong? The other solution, which is the one I have implemented so far is to have a global game object that isn't destroyed between scenes, handling all the data between scenes. So when the game starts, I load a Start Scene where this object is loaded.

After this ends, it loads the first real game scene, usually a main menu. While this has worked so far, it presents me with one big problem: If I want to load directly a scene, let's say for instance the final level of the game, I can't load it directly, since that scene does not contain this global game object. Am I handling this problem the wrong way? Are there better practices for this kind of challenge?

I would love to hear your opinions, thoughts and suggestions on this issue. Listed in this answer are the fundamental ways of handling this situation. Although, most of these methods do not scale well to large projects.

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If you want something more scalable and are not afraid of getting your hands dirty, check out the answer by Lea Hayes about Dependency Injection frameworks. You can create a static script to hold data only. Since it is static, you don't need to assign it to a GameObject.

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You can simply access your data like ScriptName. If you need your script to be assigned to a GameObject or derive from MonoBehavior, then you can add DontDestroyOnLoad gameObject ; line to your class where it can be executed once Placing it in Awake is usally the way to go for this.

This is a bit overkill for storing values between scenes. If you don't need encryption, I discourage you from this method.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. How can I pass parameters to a secondary window in javafx? Is there a way to communicate with the corresponding controller? For example: The user chooses a customer from a TableView and a new window is opened, showing the customer's info. The problem is, I can't find a way to tell the controller where to look for the customer's info by passing the id as parameter. For small applications I highly recommend passing parameters directly from the caller to the controller - it's simple, straightforward and requires no extra frameworks.

For larger, more complicated applications, it would be worthwhile investigating if you want to use Dependency Injection or Event Bus mechanisms within your application.

Pass custom data to an FXML controller by retrieving the controller from the FXML loader instance and calling a method on the controller to initialize it with the required data values. FXMLLoader instances themselves never know anything about domain objects. You do not directly pass application specific domain objects into the FXMLLoader constructor, instead you:.

This blog by another writer provides an alternate, but similar, example. You can construct a new controller in code, passing any parameters you want from your caller into the controller constructor. Once you have constructed a controller, you can set it on an FXMLLoader instance before you invoke the load instance method.

1. A static script for holding data only

To set a controller on a loader in JavaFX 2. This method is exemplified by Sergey's answer to Javafx 2.

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This provides a callback that you can use to create the controller instance with dependent values injected by the respective dependency injection system. An example of JavaFX application and controller dependency injection with Spring is provided in the answer to:.

A really nice, clean dependency injection approach is exemplified by the afterburner. Greg Brown, the original FXML specification creator and implementor, often suggests considering use of an event bus, such as the Guava EventBusfor communication between FXML instantiated controllers and other application logic.

The method can be void as well because you already giving the command show ; just before return stage. How do you plan usage by returning the Stage. It is a functional solution to a problem. A stage is returned from the showCustomerDialog function so that a reference to it can be stored by an external class which may wish to do something, such as hide the stage based on a button click in the main window, at a later time.

An alternate, object-oriented solution could encapsulate the functionality and stage reference inside a CustomerDialog object or have a CustomerDialog extend Stage. A full example for an object-oriented interface to a custom dialog encapsulating FXML, controller and model data is beyond the scope of this answer, but may make a worthwhile blog post for anybody inclined to create one.

Additional information supplied by StackOverflow user named dzim. The approach is still valid and tested in Marchon Spring Boot v1. Sometimes, you might want to pass results back to the caller, in which case you can check out the answer to the related question:.

I realize this is a very old post and has some great answers already, but I wanted to make a simple MCVE to demonstrate one such approach and allow new coders a way to quickly see the concept in action.

The Goal: To demonstrate passing values from Controller1 to Controller2 and vice versa. This is a very simple demonstration and could surely stand for some improvement, but should make the concept very clear. And controller can check, if info is set. Also, you could use ObjectProperty for back-forward data transfering, if needed.

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In the second example, the button field is annotated to allow the loader to set its value.


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