Question

我在Window中有字段，有些带有验证器，所有字段都绑定到属性。验证按预期工作。

但是 -

当任何字段无效时，我不想继续。确定是否有任何验证错误的最佳方法是什么？

Answer 1

在Vaadin中有几种处理验证的方法，所有这些都由Vaadin支持（不需要自定义布尔值afterValidationFlag）。一种可能的方式（由我提供）如下所示：

public class CustomWindow extends Window {

    DateField customBeanFirstPropertyName = new DateField("Caption1");
    ComboBox customBeanSecondPropertyName = new ComboBox("Caption2");
    TextArea customBeanThirdPropertyName = new TextArea("Caption3");

    BeanFieldGroup<CustomBean> binder = new BeanFieldGroup<>(CustomBean.class);

    public CustomWindow(CustomBean customBean) {
        buildLayout();
        binder.buildAndBindMemberFields(this);
        binder.setItemDataSource(new BeanItem<>(customBean));

        //add validators
        customBeanFirstPropertyName.addValidator((Validator) value -> {
            if (value == null) throw new Validator.InvalidValueException("nonnull required");
        });
        customBeanThirdPropertyName.addValidator(
                new RegexpValidator(".{3,20}", "length between 3-20 required")
        );
        /*
        or have basic validators on @Entity level with e.g. javax.validation.constraints.Size
        example:
        @Size(min = 3, max = 20)
        @Column(name = "customBeanThirdPropertyName", unique = true)
        private String customBeanThirdPropertyName;
        */
    }

    void commit(Button.ClickEvent event) { //method called by "save" button
        try {
            binder.commit(); //internally calls valid() method on each field, which could throw exception
            CustomBean customBeanAfterValidation = binder.getItemDataSource().getBean(); //custom actions with validated bean from binder
            this.close();
        } catch (FieldGroup.CommitException e) {
            Map<Field<?>, Validator.InvalidValueException> invalidFields = e.getInvalidFields(); //do sth with invalid fields
        }
    }
}

Answer 2

如果您使用FieldGroup实例将字段与属性绑定（这是推荐的方式），您可以写：

{"access_token":"c.KDYfQh2vrkS0w4k4BtGcJPysmzAzb3uXNz2myCMcEko5dUnrs5022kPd6cJnn5sg97hzXbm9YDzkDELXiLW58Frj6b2GyawbWLQMmm2x0eqmqa0j9VMpVQz2UXZ0mC2nDp7EmgVqsqgAXXA6","expires_in":315360000}

检查字段组管理的字段的所有字段验证。

Answer 3

保持旗帜。在继续之前，请检查是否已设置标志。在验证代码中，如果验证失败，请设置标志。

检查所有字段是否有效的最佳方法是什么？

3 个答案: