Question

我正在一个项目中，我需要在表视图中添加一些数据，但是当我尝试调用addToTable时，它没有显示任何数据。我已经尝试过刷新表，并且当我尝试在initialize方法中对其进行硬编码时，在启动应用程序时它确实会显示。编辑：我在创建表视图的位置添加了Fxml文件。

package nl.delphinity.controller;

import java.net.URL;
import java.util.ResourceBundle;

import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.control.Button;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableView;
import javafx.scene.control.cell.PropertyValueFactory;
import nl.delphinity.model.QuestionTable;

public class TeacherController implements Initializable {
    @FXML
    public TableView<QuestionTable> tableView;
    @FXML
    public TableColumn<QuestionTable, String> nameColumn;
    @FXML
    public TableColumn<QuestionTable, String> subjectColumn;
    @FXML
    public TableColumn<QuestionTable, String> timeColumn;
    public Button finishQuestion;

    @Override
    public void initialize(URL location, ResourceBundle resources) {        
        nameColumn.setCellValueFactory(new PropertyValueFactory<QuestionTable, String>("name"));
        subjectColumn.setCellValueFactory(new PropertyValueFactory<QuestionTable, String>("subject"));
        timeColumn.setCellValueFactory(new PropertyValueFactory<QuestionTable, String>("time"));
    }

    @FXML
    private void answerQuestion() {
        QuestionTable selectedItem = tableView.getSelectionModel().getSelectedItem();
        tableView.getItems().remove(selectedItem);
    }

    @FXML
    public void addToTable(String name, String subject, String time) {      
        QuestionTable test = new QuestionTable(name, subject, time);
        tableView.getItems().add(test);


    }
}

<?xml version="1.0" encoding="UTF-8"?>

<?import javafx.scene.control.Button?>
<?import javafx.scene.control.Label?>
<?import javafx.scene.control.TableColumn?>
<?import javafx.scene.control.TableView?>
<?import javafx.scene.layout.AnchorPane?>
<?import javafx.scene.paint.LinearGradient?>
<?import javafx.scene.paint.Stop?>
<?import javafx.scene.text.Font?>

<AnchorPane id="AnchorPane" prefHeight="551.0" prefWidth="340.0" style="-fx-background-color: #fff; -fx-border-width: 200%; -fx-border-color: afabab;" xmlns="http://javafx.com/javafx/11.0.1" xmlns:fx="http://javafx.com/fxml/1" fx:controller="nl.delphinity.controller.TeacherController">
  <Label alignment="CENTER" layoutX="33.0" layoutY="69.0" prefHeight="107.0" prefWidth="275.0" style="-fx-font-family: calibri;" text="Vos by Tesla">
    <font>
      <Font size="40.0" />
    </font>
    <textFill>
      <LinearGradient endX="1.0" endY="1.0" startX="0.18702290895330997" startY="1.0">
        <stops>
          <Stop color="#8e2de2" />
          <Stop color="#5100ff" offset="1.0" />
        </stops>
      </LinearGradient>
    </textFill>
  </Label>
   <TableView fx:id="tableView" layoutX="45.0" layoutY="176.0" prefHeight="285.0" prefWidth="250.0" style="-fx-background-color: #dad8d4;">
      <columns>
         <TableColumn fx:id="nameColumn" prefWidth="84.00000762939453" text="Naam" />
         <TableColumn fx:id="subjectColumn" prefWidth="81.5999755859375" text="Vak" />
         <TableColumn fx:id="timeColumn" prefWidth="84.79998779296875" text="Tijd" />
      </columns>
   </TableView>
   <Button fx:id="finishQuestion" layoutX="95.0" layoutY="488.0" mnemonicParsing="false" onMouseClicked="#answerQuestion" prefHeight="26.0" prefWidth="150.0" text="Vraag afhandelen" textFill="#636060" />
</AnchorPane>

    public void QuestionListener(String subject) {
        App.db.collection(subject)
        .whereEqualTo("subject", subject)
        .addSnapshotListener(new EventListener<QuerySnapshot>() {
          @Override
          public void onEvent(@Nullable QuerySnapshot snapshots,
                              @Nullable FirestoreException e) {
            if (e != null) {
              System.err.println("Listen failed: " + e);
              return;
            }

            for (DocumentChange dc : snapshots.getDocumentChanges()) {
              switch (dc.getType()) {
                case ADDED:
                  System.out.println("New: " + dc.getDocument().getData());
                  TeacherController teacherController = new TeacherController();
                  teacherController.addToTable(dc.getDocument().getString("name"), dc.getDocument().getString("subject"), dc.getDocument().getString("time"));
                  break;
                case MODIFIED:
                  System.out.println("Modified: " + dc.getDocument().getData());
                  break;
                case REMOVED:
                  System.out.println("Removed: " + dc.getDocument().getData());
                  break;
                default:
                  break;
              }
            }
          }
        });
    }
    ```

Answer 1

您需要将observablList附加到表视图中，并且代码应如下所示。

public class TeacherController implements Initializable {
@FXML
public TableView<QuestionTable> tableView;
@FXML
public TableColumn<QuestionTable, String> nameColumn;
@FXML
public TableColumn<QuestionTable, String> subjectColumn;
@FXML
public TableColumn<QuestionTable, String> timeColumn;
public Button finishQuestion;
private Observablelist<QuestionTable> data = FXCollection.observableArrayList();

@Override
public void initialize(URL location, ResourceBundle resources) {        
    nameColumn.setCellValueFactory(new PropertyValueFactory<QuestionTable, String>("name"));
    subjectColumn.setCellValueFactory(new PropertyValueFactory<QuestionTable, String>("subject"));
    timeColumn.setCellValueFactory(new PropertyValueFactory<QuestionTable, String>("time"));
tableview.setItem(data);//Add Observable list object here....
}


@FXML
private void answerQuestion() {
    QuestionTable selectedItem = tableView.getSelectionModel().getSelectedItem();
    tableView.getItems().remove(selectedItem);
}

@FXML
public void addToTable(String name, String subject, String time) {      
    QuestionTable test = new QuestionTable(name, subject, time);
    tableView.getItems().add(test);


}

}

如果已创建，则可以在表中添加或删除数据

data.remove(tableView.getSelectionModel().getSelectedIndex());
data.add(QuestionTable q);

JavaFX：TableView数据未显示

1 个答案: