JavaFX | ComboBox with examples

20 Aug, 2021
ComboBox is a part of the JavaFX library. JavaFX ComboBox is an implementation of simple ComboBox which shows a list of items out of which user can select at most one item, it inherits the class ComboBoxBase.
Constructors of ComboBox: 
ComboBox(): creates a default empty combo boxComboBox(ObservableList i): creates a combo box with the given items
ComboBox(): creates a default empty combo box
ComboBox(ObservableList i): creates a combo box with the given items
Commonly used Methods:  
Below programs illustrate the ComboBox class of JavaFX:
Program to create a Combo Box and add items to it: This program creates a ComboBox named combo_box and add a list of string to it using ChoiceBox(FXCollections.observableArrayList(week_days)). We would add the combo box and a label(description) to the tilepane(getChildren().add() function). We will create a stage (container) and add the tilepane to the scene and add the scene to the stage. We would display the stage using show() function.
Java
// Java Program to create a combo Box and add items to itimport javafx.application.Application;import javafx.scene.Scene;import javafx.scene.control.*;import javafx.scene.layout.*;import javafx.event.ActionEvent;import javafx.event.EventHandler;import javafx.collections.*;import javafx.stage.Stage;import javafx.scene.text.Text.*;import javafx.scene.paint.*;import javafx.scene.text.*;public class combo_box_1 extends Application {     // Launch the application    public void start(Stage stage)    {        // Set title for the stage        stage.setTitle("creating combo box ");         // Create a tile pane        TilePane r = new TilePane();         // Create a label        Label description_label =                     new Label("This is a combo box example ");         // Weekdays        String week_days[] =                   { "Monday", "Tuesday", "Wednesday",                                    "Thursday", "Friday" };         // Create a combo box        ComboBox combo_box =                     new ComboBox(FXCollections                                 .observableArrayList(week_days));         // Create a tile pane        TilePane tile_pane = new TilePane(combo_box);         // Create a scene        Scene scene = new Scene(tile_pane, 200, 200);         // Set the scene        stage.setScene(scene);         stage.show();    }     public static void main(String args[])    {        // Launch the application        launch(args);    }}
Output: 
Program to create a combo box and add an event handler to it: This program creates a ComboBox named combo_box and add a list of string to it using(ChoiceBox(FXCollections.observableArrayList(week_days))). We would add the combo box and a label(description) to the tilepane(getChildren().add() function). We will create a stage (container) and add the tilepane to the scene and add the scene to the stage. We would display the stage using show() function. We would add an event handler event to handle the events of combo_box which will change the text of the label selected to the item selected. We will also add the label selected to the tile pane.
Java
// Java program to create a combo box and add event handler to itimport javafx.application.Application;import javafx.scene.Scene;import javafx.scene.control.*;import javafx.scene.layout.*;import javafx.event.ActionEvent;import javafx.event.EventHandler;import javafx.collections.*;import javafx.stage.Stage;import javafx.scene.text.Text.*;import javafx.scene.paint.*;import javafx.scene.text.*;public class combo_box_2 extends Application {     // Launch the application    public void start(Stage stage)    {        // Set title for the stage        stage.setTitle("creating combo box ");         // Create a tile pane        TilePane r = new TilePane();         // Create a label        Label description_label =                         new Label("This is a combo box example ");         // Weekdays        String week_days[] =                   { "Monday", "Tuesday", "Wednesday",                                   "Thursday", "Friday" };         // Create a combo box        ComboBox combo_box =                    new ComboBox(FXCollections                              .observableArrayList(week_days));         // Label to display the selected menuitem        Label selected = new Label("default item selected");         // Create action event        EventHandler<ActionEvent> event =                  new EventHandler<ActionEvent>() {            public void handle(ActionEvent e)            {                selected.setText(combo_box.getValue() + " selected");            }        };         // Set on action        combo_box.setOnAction(event);         // Create a tile pane        TilePane tile_pane = new TilePane(combo_box, selected);         // Create a scene        Scene scene = new Scene(tile_pane, 200, 200);         // Set the scene        stage.setScene(scene);         stage.show();    }     public static void main(String args[])    {        // Launch the application        launch(args);    }}
Output: 
Note: The above programs might not run in an online IDE please use an offline converter.
Reference: https://docs.oracle.com/javase/8/javafx/api/javafx/scene/control/ComboBox.html 
nidhi_biet
ManasChhabra2
peterlamantia5
sagartomar9927
JavaFX
Java
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