Pure JavaScript client side validation is the simplest but least feature-rich type of Client Side Validation.
This type of validation uses 100% client-side JavaScript code to try to
validate the values entered by the user. Because the validation logic
is actually repeated in the JavaScript code, it is important to
understand that some values will be considered acceptable by the
JavaScript code but will be marked as unacceptable by the server-side Validation.
纯Javascript客户端验证是最简单的，但是只功能有限的客户端验证。这种类型的验证用100％的客户端javascript代码验证用户录入的值。因为验证逻辑是javascript代码，所以理解－－一些值javascript代码认为通过了，而服务器端的验证可能不通过－－是非常重要的。
Only the following validators are supported:
- required validator
- requiredstring validator
- stringlength validator
- regex validator
- email validator
- url validator
- int validator
- double validator
Error reporting
Because client side validation does not talk to the server, the theme (xhtml theme or css_xhtml theme)
is responsible for properly manipulating the HTML DOM to display the
error message inline. The JavaScript that is responsible for doing this
logic is validation.js and can be found in each theme.
因为客户端的验证不与服务器端交互，主题（....）负责操纵HTML DOM来显示再现错误消息。负责这个逻辑的javascript是validation.js，能在各自的主题里找到。
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Errors
are reported using the default validation message, not the
internationalized version that the server-side might be aware of. This
is a known issue. You may want to try the AJAX Client Side Validation for messages that are fully internationalized.
用验证消息显示错误报告不能被国际化。你可能想用Ajax Client Side validation来是消息完全国际化。
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Additional Validator Support
If you wish to add additional validator support beyond those listed, you may override the xhtml theme teamplte form-close-validate.ftl. This file contains the JavaScript that tries to validate each user-entered value from within the browswer. The css_xhtml theme extends the xhtml theme and therefore doesn't have it's own form-close-validate.ftl template.