我在从组合框中选择一个值时尝试更新JavaFX中的标签。 comboBox中的值表示数组对象。当我第一次加载页面并选择一个选项时，它会成功更新。但是，当我在comboBox中选择不同的值时，标签不会更新。任何人都可以建议为什么会这样吗？
package controllers;
import java.net.URL;
import java.util.ResourceBundle;
import app.TreatmentRoom;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.fxml.FXMLLoader;
import javafx.fxml.Initializable;
import javafx.scene.Node;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.control.ComboBox;
import javafx.scene.control.Label;
import javafx.stage.Stage;
public class DoctorAssessmentPageController implements Initializable {
@FXML
private ComboBox<String> comboBox;
@FXML
private Label nhsNumberLabel;
@FXML
private Label titleLabel;
@FXML
private Label firstNameLabel;
@FXML
private Label lastNameLabel;
ObservableList<String> list = FXCollections.observableArrayList("Treatment Room 1", "Treatment Room 2",
"Treatment Room 3", "Treatment Room 4", "Treatment Room 5");
@Override
public void initialize(URL location, ResourceBundle resources) {
comboBox.setItems(list);
}
@FXML
private void buttonActionConfirmRoom(ActionEvent event) {
switch (comboBox.getValue()) {
case ("Treatment Room 1"):
setPatientInfo(0);
break;
case ("Treatment Room 2"):
setPatientInfo(1);
break;
case ("Treatment Room 3"):
setPatientInfo(2);
break;
default:
System.out.println("treatment room not recognised");
}
}
public void setPatientInfo(int i) {
nhsNumberLabel.setText(TreatmentRoom.treat[i].getPatient().getNhsNumber());
titleLabel.setText(TreatmentRoom.treat[i].getPatient().getTitle());
firstNameLabel.setText(TreatmentRoom.treat[i].getPatient().getFirstName());
lastNameLabel.setText(TreatmentRoom.treat[i].getPatient().getLastName());
}
@FXML
private void btnLogout(ActionEvent event) throws Exception {
FXMLLoader loader = new FXMLLoader();
loader.setLocation(getClass().getResource("/views/FXMLLoginPage.FXML"));
loader.load();
Parent p = loader.getRoot();
Stage stage = new Stage();
stage.setScene(new Scene(p));
stage.show();
stage.centerOnScreen();
// hides current page
((Node) (event.getSource())).getScene().getWindow().hide();
}
}
FXML for FXMLDoctorAssessmentPage
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.shape.*?>
<?import javafx.scene.text.*?>
<?import javafx.scene.control.*?>
<?import java.lang.*?>
<?import javafx.scene.layout.*?>
<?import javafx.scene.layout.AnchorPane?>
<AnchorPane prefHeight="600.0" prefWidth="1000" stylesheets="@../styles/DoctorAssessmentPage1.css" xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1" fx:controller="controllers.DoctorAssessmentPageController">
<children>
<TabPane prefHeight="665.0" prefWidth="1385.0" tabClosingPolicy="UNAVAILABLE">
<tabs>
<Tab text="Doctor Assessment">
<content>
<AnchorPane minHeight="0.0" minWidth="0.0" prefHeight="665.0" prefWidth="1385.0">
<children>
<Rectangle arcHeight="5.0" arcWidth="5.0" fill="#517da6" height="90.0" stroke="WHITE" strokeType="INSIDE" styleClass="rectangle-pane" width="1385.0" />
<Rectangle arcHeight="5.0" arcWidth="5.0" fill="#72b2ee" height="53.0" layoutX="341.0" layoutY="494.0" stroke="WHITE" strokeType="INSIDE" styleClass="rectangle-pane2" width="193.0" />
<Rectangle arcHeight="5.0" arcWidth="5.0" fill="#72b2ee" height="426.0" layoutX="43.0" layoutY="121.0" stroke="WHITE" strokeType="INSIDE" styleClass="rectangle-pane2" width="237.0" />
<Label fx:id="nhsNumberLabel" layoutX="59.0" layoutY="226.0" prefHeight="20.0" prefWidth="158.0" styleClass="label-subTitle" />
<Label fx:id="titleLabel" layoutX="57.0" layoutY="282.0" styleClass="label-subTitle" text="Label" />
<Label fx:id="allergiesLabel" layoutX="56.0" layoutY="442.0" styleClass="label-subTitle" text="allergiesLabel" />
<Label layoutX="58.0" layoutY="403.0" styleClass="label-info" text="Allergies:" />
<Label fx:id="bloodTypeLabel" layoutX="57.0" layoutY="365.0" styleClass="label-subTitle" text="bloodTypeLabel" />
<Label layoutX="57.0" layoutY="329.0" styleClass="label-info" text="Blood type:" />
<Label layoutX="58.0" layoutY="251.0" prefHeight="25.0" prefWidth="66.0" styleClass="label-info" text="Name:" />
<Label layoutX="58.0" layoutY="201.0" styleClass="label-info" text="NHS Number:" />
<Label fx:id="lastNameLabel" layoutX="181.0" layoutY="282.0" styleClass="label-subTitle" text="Label" />
<Label fx:id="firstNameLabel" layoutX="119.0" layoutY="282.0" styleClass="label-subTitle" text="Label" />
<Button fx:id="btnExtend5mins" layoutX="1038.0" layoutY="389.0" mnemonicParsing="false" onAction="#btnExtend5minsClick" prefHeight="53.0" prefWidth="161.0" styleClass="button-extension" text="5+ minutes" />
<Button layoutX="1038.0" layoutY="124.0" mnemonicParsing="false" prefHeight="53.0" prefWidth="161.0" text="Finalise Patient" />
<TextArea layoutX="312.0" layoutY="122.0" prefHeight="321.0" prefWidth="270.0" promptText="Triage assessment" />
<Label id="label-subTitle1" layoutX="57.0" layoutY="167.0" text="Patient" textFill="WHITE">
<font>
<Font name="System Bold" size="15.0" />
</font>
</Label>
<TextArea layoutX="621.0" layoutY="121.0" prefHeight="321.0" prefWidth="394.0" promptText="Doctor assessment" />
<Label fx:id="timeSpentLabel" layoutX="438.0" layoutY="508.0" prefHeight="21.0" prefWidth="66.0" styleClass="label-subTitle" text="Label" />
<Label layoutX="348.0" layoutY="508.0" prefHeight="25.0" prefWidth="89.0" styleClass="label-info" text="Time spent:" />
<Button layoutX="1200.0" layoutY="25.0" mnemonicParsing="false" onAction="#btnLogout" text="Logout" />
<Label fx:id="triageCategoryLabel" layoutX="57.0" layoutY="140.0" text="triageCategoryLabel" textFill="WHITE">
<font>
<Font name="System Bold" size="15.0" />
</font>
</Label>
<Label layoutX="348.0" layoutY="16.0" styleClass="label-title" text="Doctor Assessment & Treatment Room" />
<Button layoutX="823.0" layoutY="504.0" mnemonicParsing="false" onAction="#buttonActionConfirmRoom" prefHeight="40.0" prefWidth="190.0" text="Confirm" />
<ComboBox fx:id="comboBox" layoutX="619.0" layoutY="505.0" prefHeight="39.0" prefWidth="190.0" promptText="Select Room" visibleRowCount="5" />
</children>
</AnchorPane>
</content>
</Tab>
<Tab text="Queue">
<content>
<AnchorPane minHeight="0.0" minWidth="0.0" prefHeight="180.0" prefWidth="200.0">
<children>
<fx:include source="FXMLQueueTabPage.fxml" />
</children>
</AnchorPane>
</content>
</Tab>
<Tab closable="false" text="Treatment Rooms">
<content>
<fx:include source="FXMLTreatmentRoomPage.fxml" />
</content>
</Tab>
</tabs>
</TabPane>
</children>
</AnchorPane>
感谢， ķ
答案 0 :(得分：0)
如果我理解得很清楚，您希望在不点击按钮的情况下更新标签。
这是一个解决方案：
public class DoctorAssessmentPageController implements Initializable {
@FXML
private ComboBox<String> comboBox;
@FXML
private Label nhsNumberLabel;
@FXML
private Label titleLabel;
@FXML
private Label firstNameLabel;
@FXML
private Label lastNameLabel;
ObservableList<String> list = FXCollections.observableArrayList("Treatment Room 1", "Treatment Room 2",
"Treatment Room 3", "Treatment Room 4", "Treatment Room 5");
@Override
public void initialize(URL location, ResourceBundle resources) {
/* ******* Here is the Trick *********
listens to the value property of the comboBox.
calls the updateLabels function when the value changes. */
comboBox.valueProperty().addListener(new ChangeListener<String>() {
@Override
public void changed(ObservableValue<? extends String> observable, String oldValue, String newValue) {
updateLabels(newValue);
}
});
comboBox.setItems(list);
}
private void updateLabels(String newValue) {
switch (newValue) {
case ("Treatment Room 1"):
setPatientInfo(0);
break;
case ("Treatment Room 2"):
setPatientInfo(1);
break;
case ("Treatment Room 3"):
setPatientInfo(2);
break;
default:
System.out.println("treatment room not recognised");
}
}
public void setPatientInfo(int i) {
nhsNumberLabel.setText(TreatmentRoom.treat[i].getPatient().getNhsNumber());
titleLabel.setText(TreatmentRoom.treat[i].getPatient().getTitle());
firstNameLabel.setText(TreatmentRoom.treat[i].getPatient().getFirstName());
lastNameLabel.setText(TreatmentRoom.treat[i].getPatient().getLastName());
}
@FXML
private void btnLogout(ActionEvent event) throws Exception {
FXMLLoader loader = new FXMLLoader();
loader.setLocation(getClass().getResource("/views/FXMLLoginPage.FXML"));
loader.load();
Parent p = loader.getRoot();
Stage stage = new Stage();
stage.setScene(new Scene(p));
stage.show();
stage.centerOnScreen();
// hides current page
((Node) (event.getSource())).getScene().getWindow().hide();
}
}
此致
西里尔