Question

我正在编写JavaFX应用程序，我有6个 TextFields 这些是必填字段。我也有一个默认按钮，最初是无效的。

我想用逻辑检查所有字段是否已填满。我有一个变量estado已启动false。

编码：

    if (!((TextField)event.getSource()).getText().trim().isEmpty())
        estado = estado | true;
    else 
        estado = false;

    if (estado)
        button.setDisabled(false)

所有TextFields在KeyReleased事件后获得该方法。

到目前为止，我的成绩并不好。

Answer 1

这是基本的解决方案，如果你需要更多的PLZ告诉......

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package textfieldlogic;

import java.util.regex.Matcher;
import java.util.regex.Pattern;
import javafx.application.Application;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.control.TextField;
import javafx.scene.input.KeyEvent;
import javafx.scene.layout.StackPane;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;

/**
 *
 * @author reegan
 */
public class TextFieldLogic extends Application {

    @Override
    public void start(Stage primaryStage) {
        FormattedTextField btn = new FormattedTextField("^[1-9]+$");
        btn.setText("Only Enter Numbers");

        FormattedTextField btn1 = new FormattedTextField("^[a-z]+$");
        btn1.setText("Only Enter Characters");

        VBox vBox = new VBox(20);
        vBox.getChildren().addAll(btn,btn1);

        StackPane root = new StackPane();
        root.getChildren().add(vBox);

        Scene scene = new Scene(root, 300, 250);

        primaryStage.setTitle("Hello World!");
        primaryStage.setScene(scene);
        primaryStage.show();
    }

    /**
     * The main() method is ignored in correctly deployed JavaFX application.
     * main() serves only as fallback in case the application can not be
     * launched through deployment artifacts, e.g., in IDEs with limited FX
     * support. NetBeans ignores main().
     *
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        launch(args);
    }

    public class FormattedTextField extends TextField {

    Matcher matcher;

    public FormattedTextField(String regex) {
        Pattern pattern = Pattern.compile(regex);
        matcher = pattern.matcher("");
        EventHandler<KeyEvent> filter = new EventHandler<KeyEvent>() {
            @Override
            public void handle(KeyEvent t) {
                String s = getText() + t.getCharacter();
                matcher.reset(s);
                if (!( matcher.matches() || matcher.hitEnd())) {
                    t.consume();
                }
            }
        };
        addEventFilter(KeyEvent.KEY_TYPED, filter);
    } 
}

}

Answer 2

查看this gist是否有帮助。验证工作在Controller文件中完成。这比你的问题要广泛得多，但可能会给你一些想法。

我将disableProperty绑定到各种BooleanBinding，而不是侦听事件（或属性的更改）。这些BooleanBinding封装了给定控件或控件集的“有效/无效”概念。

对于这个的简单版本，对于您的示例，您可以执行以下操作：

import javafx.application.Application;
import javafx.beans.binding.Bindings;
import javafx.beans.binding.BooleanBinding;
import javafx.geometry.Insets;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.TextField;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;

public class SimpleTextFieldValidation extends Application {

    @Override
    public void start(Stage primaryStage) {
        TextField tf1 = new TextField();
        TextField tf2 = new TextField();
        TextField tf3 = new TextField();
        TextField tf4 = new TextField();
        TextField tf5 = new TextField();
        TextField tf6 = new TextField();
        Button button = new Button("Submit");

        button.disableProperty().bind(
            emptyTextFieldBinding(tf1)
                .or(emptyTextFieldBinding(tf2))
                .or(emptyTextFieldBinding(tf3))
                .or(emptyTextFieldBinding(tf4))
                .or(emptyTextFieldBinding(tf5))
                .or(emptyTextFieldBinding(tf6))
             );

        VBox root = new VBox(5, tf1, tf2, tf3, tf4, tf5, tf6, button);
        root.setAlignment(Pos.CENTER);
        root.setPadding(new Insets(10));
        Scene scene = new Scene(root, 150, 400);
        primaryStage.setScene(scene);
        primaryStage.show();
    }

    private BooleanBinding emptyTextFieldBinding(TextField textField) {
        return Bindings.length(textField.textProperty()).isEqualTo(0);
    }

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

使用逻辑条件验证文本字段的完整性

2 个答案: