Server field validator—adds server-side validation to HTML form fields.
服务器字段验证器 —向HTML表单字段添加服务器端验证。
It is also possible to define a custom field validator if none of the existing ones fit your needs.
如果没有符合要求的验证程序，也可以定义一个自定义字段验证程序。
This will also avoid that the widget converter and field validator get out of sync.
这也将会避免部件转换器和域校验器不同步。
This will also avoid that the widget converter and field validator get out of sync.
这也将会避免部件转换器和域校验器不同步。
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