JavaFX datepicker - 如何在第二个datepicker对象中更新日期？ [英] JavaFX datepicker - how to update date in a second datepicker object?

问题描述

问题：
我在同一个场景中有两个datepicker对象checkIn_date和checkOut_date。
有一种方法可以自动更改第二个datepicker对象中的日期字段吗？
例如：checkIn_date设置为2015-08-10，checkOut_date设置为2015-08-11。如果我在checkIn_date中更改日期字段，即2015-08-22，则checkOut_date会自动更新为2015-08-23。
感谢您的任何建议。

Problem: I've two datepicker object checkIn_date and checkOut_date in the same scene. There is a way to change automatically the date field in the second datepicker object? For example : checkIn_date is set with 2015-08-10 and checkOut_date is set with 2015-08-11. If I change the date field in checkIn_date i.e. 2015-08-22, checkOut_date update automatically to 2015-08-23. Thanks for any advices.

推荐答案

您可以通过向添加监听器来实现此目的签入DatePicker ，获取新值，添加您想要的天数并将新值更新为签出DatePicker 。

You can achieve this by adding a listener to your check-in DatePicker, fetch the new value, add the no of days you want to it and update the new value to the check-out DatePicker.

这是一个MCVE，可以更好地了解我的意思：

Here is a MCVE to give more idea on what I meant :

import javafx.application.Application;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.*;
import javafx.scene.layout.HBox;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;

public class Main extends Application {

    private final int noOfDaysToAdd = 2;

    @Override
    public void start(Stage primaryStage) throws Exception {

        VBox root = new VBox(10);
        root.setAlignment(Pos.CENTER);
        Label checkInLabel = new Label("Check In :    ");
        Label checkOutLabel = new Label("Check Out : ");
        DatePicker picker1 = new DatePicker();
        DatePicker picker2 = new DatePicker();

        // Listener for updating the checkout date w.r.t check in date
        picker1.valueProperty().addListener((ov, oldValue, newValue) -> {
            picker2.setValue(newValue.plusDays(noOfDaysToAdd));
        });

        HBox checkInBox = new HBox(10, checkInLabel, picker1);
        HBox checkOutBox = new HBox(10, checkOutLabel, picker2);
        checkInBox.setAlignment(Pos.CENTER);
        checkOutBox.setAlignment(Pos.CENTER);

        root.getChildren().addAll(checkInBox, checkOutBox);
        Scene scene = new Scene(root, 400, 400);
        primaryStage.setScene(scene);
        primaryStage.show();


    }

    public static void main(String[] args) {
        launch(args);
    }
}

输出：

更新

您可以重新编写代码段

picker1.valueProperty().addListener((ov, oldValue, newValue) -> {
    picker2.setValue(newValue.plusDays(noOfDaysToAdd));
});

没有lambda为：

picker1.valueProperty().addListener(new ChangeListener<LocalDate>() {
    @Override
    public void changed(ObservableValue<? extends LocalDate> observable, LocalDate oldValue, LocalDate newValue) {
        picker2.setValue(newValue.plusDays(noOfDaysToAdd));
    }
});

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