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。
To use a custom validator you must add it to the form, passing it field elements on which the validation needs to be applied, as shown in Listing 14.
要使用定制验证器,必须将其添加到表单,并为它传递需要被验证的那些字段元素,如清单 14 所示。
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