验证期间UIInput#getValue()和getLocalValue()之间的区别 [英] Difference between UIInput#getValue() and getLocalValue() during validation

问题描述

我想对 jsf一次验证两个字段.

如果字段已经过验证，则使用此方法有什么区别? ValueHolder API文档不是回答这个问题非常有帮助.

解决方案

如果UIInput组件已预先验证并标记为无效(即isValid()方法返回false)，则getLocalValue()返回null，但getValue()返回旧模型值(如果有).如果标记为有效，则两者都返回相同的值，即已提交，已转换和已验证的值.

您想预先在isValid()上添加支票.您可能会发现 OmniFaces 多个字段验证器的源代码示例很有帮助.参见 源代码链接，位于 <o:validateEqual> 展示页面的底部. /p>

另请参见:

• ​​ JSF不支持字段验证，是否有解决方法?

I would like to have an illustrative explanation about the difference between getValue() and getLocalValue() methods of UIInput components in the aspect of performing multiple field validation: jsf validate two fields in one time.

What is the difference in usage of this methods if the fields are already validated? The ValueHolder API documentation is not very helpful in answering this.

解决方案

If the UIInput component has been validated beforehand and is marked invalid (i.e. isValid() method returns false), then the getLocalValue() returns null, but the getValue() returns the old model value, if any. If it's marked valid, then both returns the same value, namely the submitted, converted and validated value.

You'd like to add a check on isValid() beforehand. You may find the source code examples of the OmniFaces multiple field validators helpful. See the ValidateMultipleFields source code link at the bottom of the <o:validateEqual> showcase page.

See also:

• JSF doesn't support cross-field validation, is there a workaround?

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