如何在Vaadin 8中添加验证器? [英] How to add Validators in Vaadin 8?

问题描述

在Vaadin 7中有一个addValidator函数，但在Vaadin 8中不存在.

Vaadin 7示例:

  TextField用户=新的TextField("User:");user.setRequired(true);user.setInputPrompt(您的用户名");user.addValidator(new NullValidator(用户名不能为空"，false));user.setInvalidAllowed(false); 

解决方案

我在这里找到了答案:

In Vaadin 7 there was an addValidator function, but in Vaadin 8 it does not exist.

Vaadin 7 Example:

   TextField user = new TextField("User:");
   user.setRequired(true);
   user.setInputPrompt("Your username");
   user.addValidator(new NullValidator("Username can't be empty", false));
   user.setInvalidAllowed(false);

解决方案

I found the answer here: Whats New

Example:

new Binder<Person>().forField(tf)
    .withValidator(str -> str.length() == 4, "Must be 4 chars")
    .withConverter(new StringToIntegerConverter("Must be Integer"))
    .withValidator(integer -> integer.equals(2017), "Wrong date")
    .bind(Person::getBirthYear, Person::setBirthYear);

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