似乎我的 Controller 、main.fxml 或 main 没有相互“链接”。没有编译错误，我的代码运行良好，但是当我尝试执行事件(例如单击按钮)时，即使确实存在事件处理程序，似乎也没有发生任何事情。
主 Controller 类:
package ivashkem;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.fxml.FXML;
import javafx.scene.control.Button;
import javafx.scene.control.TextArea;
import javafx.scene.control.TextField;
public class Assign2Controller {
@FXML private Button btnAdd;
@FXML private Button btnSave;
@FXML private Button btnOrders;
@FXML private Button btnExit;
@FXML private TextField txtID;
@FXML private TextField txtName;
@FXML private TextField txtQOH;
@FXML private TextField txtROP;
@FXML private TextField txtPrice;
@FXML private TextArea txtDisplay;
@FXML private void initialize() {
btnAdd.setOnAction(new addHandler());
btnExit.setOnAction(e -> onExitClicked());
}
public void onAddClicked(){
System.out.println("Add was clicked");
txtID.clear();
txtName.clear();
txtQOH.clear();
txtROP.clear();
txtPrice.clear();
txtPrice.setText("Test");
}
public void onExitClicked(){
System.out.println("test");
}
private class addHandler implements EventHandler<ActionEvent> {
public void handle(ActionEvent e) {
onAddClicked(); // Call a method in the outer class
}
}
}
主类:
package ivashkem;
import javafx.application.Application;
import javafx.stage.Stage;
import javafx.scene.Scene;
import javafx.scene.layout.GridPane;
import javafx.fxml.FXMLLoader;
public class Assign2Main extends Application {
@Override
public void start(Stage primaryStage) {
try {
GridPane root = (GridPane)FXMLLoader.load(getClass().getResource("Main.fxml"));
Scene scene = new Scene(root,446,612);
scene.getStylesheets().add(getClass().getResource("application.css").toExternalForm());
primaryStage.setScene(scene);
primaryStage.show();
} catch(Exception e) {
e.printStackTrace();
}
}
public static void main(String[] args) {
launch(args);
}
}
FXML:
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.geometry.Insets?>
<?import javafx.geometry.Point3D?>
<?import javafx.scene.control.Button?>
<?import javafx.scene.control.Label?>
<?import javafx.scene.control.TextArea?>
<?import javafx.scene.control.TextField?>
<?import javafx.scene.layout.ColumnConstraints?>
<?import javafx.scene.layout.GridPane?>
<?import javafx.scene.layout.HBox?>
<?import javafx.scene.layout.RowConstraints?>
<?import javafx.scene.text.Font?>
<GridPane maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="612.0" prefWidth="446.0" xmlns="http://javafx.com/javafx/8.0.171" xmlns:fx="http://javafx.com/fxml/1">
<columnConstraints>
<ColumnConstraints hgrow="SOMETIMES" maxWidth="292.0" minWidth="0.0" prefWidth="0.0" />
<ColumnConstraints hgrow="SOMETIMES" maxWidth="452.0" minWidth="10.0" prefWidth="452.0" />
<ColumnConstraints hgrow="SOMETIMES" maxWidth="205.0" minWidth="0.0" prefWidth="0.0" />
</columnConstraints>
<rowConstraints>
<RowConstraints maxHeight="395.0" minHeight="0.0" prefHeight="75.0" vgrow="SOMETIMES" />
<RowConstraints maxHeight="395.0" minHeight="0.0" prefHeight="63.0" vgrow="SOMETIMES" />
<RowConstraints maxHeight="395.0" minHeight="10.0" prefHeight="69.0" vgrow="SOMETIMES" />
<RowConstraints maxHeight="395.0" minHeight="10.0" prefHeight="75.0" vgrow="SOMETIMES" />
<RowConstraints maxHeight="395.0" minHeight="10.0" prefHeight="54.0" vgrow="SOMETIMES" />
<RowConstraints maxHeight="395.0" minHeight="10.0" prefHeight="77.0" vgrow="SOMETIMES" />
<RowConstraints maxHeight="472.0" minHeight="10.0" prefHeight="262.0" vgrow="SOMETIMES" />
<RowConstraints maxHeight="472.0" minHeight="10.0" prefHeight="52.0" vgrow="SOMETIMES" />
</rowConstraints>
<padding>
<Insets bottom="10.0" left="10.0" right="10.0" top="10.0" />
</padding>
<children>
<HBox alignment="CENTER" prefHeight="58.0" prefWidth="466.0" GridPane.columnIndex="1">
<children>
<Label fx:id="lblTitle" alignment="CENTER" prefHeight="24.0" prefWidth="418.0" text="Inventory Tracker" textFill="LIME">
<font>
<Font name="Courier New" size="20.0" />
</font>
</Label>
</children>
</HBox>
<HBox prefHeight="100.0" prefWidth="351.0" spacing="10.0" GridPane.columnIndex="1" GridPane.rowIndex="1">
<padding>
<Insets bottom="10.0" left="10.0" right="10.0" top="10.0" />
</padding>
<children>
<Label fx:id="lblID" prefHeight="21.0" prefWidth="80.0" text="Item ID:" textFill="#3c2ae4">
<HBox.margin>
<Insets />
</HBox.margin>
<padding>
<Insets left="25.0" top="3.0" />
</padding>
</Label>
<TextField fx:id="txtID" prefHeight="31.0" prefWidth="120.0" promptText="Item ID" />
</children>
</HBox>
<HBox prefHeight="100.0" prefWidth="200.0" spacing="10.0" GridPane.columnIndex="1" GridPane.rowIndex="2">
<padding>
<Insets bottom="10.0" left="10.0" right="10.0" top="10.0" />
</padding>
<children>
<Label fx:id="lblName" prefHeight="21.0" prefWidth="80.0" text="Item Name:" textFill="#3c2ae4">
<padding>
<Insets top="3.0" />
</padding>
</Label>
<TextField fx:id="txtName" prefHeight="31.0" prefWidth="305.0" promptText="Item Name" />
</children>
</HBox>
<HBox prefHeight="100.0" prefWidth="200.0" spacing="10.0" GridPane.columnIndex="1" GridPane.rowIndex="3">
<padding>
<Insets bottom="10.0" left="10.0" right="10.0" top="10.0" />
</padding>
<children>
<Label fx:id="lblQOH" prefHeight="21.0" prefWidth="80.0" text="Q-O-H:" textFill="#3c2ae4">
<padding>
<Insets left="25.0" top="3.0" />
</padding>
</Label>
<TextField fx:id="txtQOH" prefHeight="31.0" prefWidth="120.0" promptText="Qty On Hand" />
<Label fx:id="lblROP" text="R-O-P:" textFill="#3c2ae4">
<padding>
<Insets top="3.0" />
</padding>
</Label>
<TextField fx:id="txtROP" prefHeight="31.0" prefWidth="120.0" promptText="Re-Order Point" />
</children>
</HBox>
<HBox prefHeight="100.0" prefWidth="409.0" spacing="10.0" GridPane.columnIndex="1" GridPane.rowIndex="4">
<padding>
<Insets bottom="10.0" left="10.0" right="10.0" top="10.0" />
</padding>
<children>
<Label fx:id="lblPrice" prefHeight="21.0" prefWidth="80.0" text="Sell Price:" textFill="#3c2ae4">
<padding>
<Insets left="10.0" top="3.0" />
</padding>
</Label>
<TextField fx:id="txtPrice" prefHeight="31.0" prefWidth="120.0" promptText="Sell Price" />
</children>
</HBox>
<HBox prefHeight="83.0" prefWidth="394.0" spacing="30.0" GridPane.columnIndex="1" GridPane.rowIndex="5">
<padding>
<Insets bottom="20.0" left="20.0" right="20.0" top="20.0" />
</padding>
<children>
<Button fx:id="btnAdd" text="_Add">
<HBox.margin>
<Insets left="35.0" />
</HBox.margin>
</Button>
<Button fx:id="btnSave" text="_Save" />
<Button fx:id="btnOrders" text="_Orders" />
<Button fx:id="btnExit" text="_Exit" />
</children>
</HBox>
<TextArea fx:id="txtDisplay" editable="false" prefHeight="200.0" prefWidth="200.0" GridPane.columnIndex="1" GridPane.rowIndex="6" />
<Label text="Message" GridPane.columnIndex="1" GridPane.rowIndex="7" />
</children>
<rotationAxis>
<Point3D />
</rotationAxis>
</GridPane>
最佳答案
您缺少 FXML 文件根元素中的 fx:controller 属性，该属性应指定用于实例化 Controller 的类的完全限定名称:
<GridPane fx:controller= "ivashkem.Assign2Controller" maxHeight=Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="612.0" prefWidth="446.0" xmlns="http://javafx.com/javafx/8.0.171" xmlns:fx="http://javafx.com/fxml/1">
...
</GridPane>
关于即使存在事件处理程序，javafx Controller 也不对事件执行任何操作，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/60368112/