Fxml ComboBox created in scene builder how to fetch data from database

Question

Hi Sir, How r u? Hope to be fine. Sir, I have a problem that i want to fetch data in fxml comboBox created in Scene Builder?
I have used this code in JavaFx 2.0 for comboBox and textField the code is
ComboBox studentRegId = new ComboBox();
try{
stm = db.con.createStatement();
rs = stm.executeQuery("select * from students order by s_reg_id asc");
while(rs.next()){               
for(int i=1; i<=1; i++)
studentRegId.getItems().add(rs.getString("s_reg_id"));
}catch(SQLException sqlException){         
final TextField sRegId = new TextField();
final String regId[] = new String[1000];
try{
stm = db.con.createStatement();
rs = stm.executeQuery("select * from students order by s_reg_id asc");
int a = 0;
while(rs.next()) {
regId[a] = rs.getString("s_reg_id");
a++; }
}catch(SQLException sqlException){         
studentRegId.getSelectionModel().selectedIndexProperty().addListener(new ChangeListener<Number>(){
public void changed(ObservableValue ov,Number value, Number new_value){                           
sRegId.setText(regId[new_value.intValue()]);
Now, the problem is that I want to use this code in Scene Builder fxml ComboBox .
Please Help Me!
I shall be very grate full to you for this kindness.
Regards

Answer 1

Hi,
Ok, so you create your FXML :
Add a controller property to your root control. (See Code tab in SceneBuilder or direcly in FXML : fx:controller tag)
Add a fx:id to your controls (your combobox) (First property in SceneBuilder or directly in FXML : fx:id)
Example :
<?xml version="1.0" encoding="UTF-8"?>
<?import java.lang.*?>
<?import java.util.*?>
<?import javafx.collections.*?>
<?import javafx.scene.control.*?>
<?import javafx.scene.layout.*?>
<?import javafx.scene.paint.*?>
<HBox prefHeight="-1.0" prefWidth="-1.0" xmlns:fx="http://javafx.com/fxml" fx:controller="org.lgringo.comboexample.Controler">
  <children>
    <TextField fx:id="text" prefWidth="100.0" />
    <ComboBox fx:id="combo" prefWidth="200.0">
      <items>
        <FXCollections fx:factory="observableArrayList">
          <String fx:value="Item 1" />
          <String fx:value="Item 2" />
          <String fx:value="Item 3" />
        </FXCollections>
      </items>
    </ComboBox>
  </children>
</HBox>Then, you create your Controler class using @FXML annotation (name of control should be the name of fx:id properties)
You can do some initialisation in the inherit method "initialize"
Example :
package org.lgringo.comboexample;
import javafx.fxml.FXML;
import javafx.scene.control.ComboBox;
import javafx.scene.control.TextField;
public class Controler {
     @FXML
     // fx:id="combo"
     private ComboBox<String> combo; // Value injected by FXMLLoader
     @FXML
     // fx:id="text"
     private TextField text; // Value injected by FXMLLoader
     @FXML // This method is called by the FXMLLoader when initialization is complete
    void initialize() {
        assert combo != null : "fx:id=\"combo\" was not injected: check your FXML file 'ComboboxExample.fxml'.";
        assert text != null : "fx:id=\"text\" was not injected: check your FXML file 'ComboboxExample.fxml'.";
        // Initialize your logic here: all @FXML variables will have been injected
        combo.getItems().clear();
        combo.getItems().addAll("John Lennon","Mick Jagger","David Bowie");
        combo.getItems().add("Others...");
        text.setText("List : ");
}Then you use the FXMLLoader class to load your FXML and Controler.
Example :
package org.lgringo.comboexample;
import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;
public class App extends Application {
      * @param args
     public static void main(String[] args) {
          App.launch(args);
     @Override
     public void start(Stage primaryStage) throws Exception {
          Parent root = FXMLLoader.load(getClass().getResource("ComboboxExample.fxml"));
          primaryStage.setTitle("Combo Example");
          primaryStage.setScene(new Scene(root, 300, 275));
          primaryStage.show();
}More info : http://docs.oracle.com/javafx/2/get_started/fxml_tutorial.htm