Provide form validation: Input validation is one of the biggest headaches for both developers and users.
提供表单验证：输入验证是开发人员和用户都十分头痛的问题。
Finally, you learned how to handle form data, providing server-side validation based on form input.
最后，您学习了如何处理表单数据，提供基于表单输入的服务器端验证。
These tags handle input validation before the form is saved.
这些标签负责在保存表单之前对输入信息进行有效性验证。
You should make each different arithmetic function its own action/method/whatevertheframeworkcallsit and you should use the frameworks input validation for the form values (if it has one).
你需要为每一种运算设置单独的动作，或者说方法（每个框架的叫法不一样），而且还要用到框架中的表单验证功能（如果框架提供了这一功能的话）。
Listing 5 has the input validation rules for the form in Listing 4.
清单5为清单4中的表单提供了输入验证规则。
Tapestry and Wicket are both able to perform server-side or client-side (using DHTML) validation on form input fields.
Tapestry和Wicket都能够对表单输入字段执行服务器端或客户机端（使用DHTML）的验证。
Listing 37 has the input validation rules for the above form.
清单37包含上述表单的输入验证规则。
In the case of server-side validation, after the form is submitted, Wicket goes through all the form components placed within the form and executes any attached validators on component input.
对于服务器端验证而言，在表单提交后，Wicket就会遍历置于表单内的所有的表单组件并对组件输入执行所有的关联验证器。
The form bean will also handle any validation that is necessary on the user input fields.
这个表单bean还将处理任何用户输入域中必需的验证。
With a mobile device, form input and validation can be much harder to display in a format that is usable.
但在行动装置下，要以可用的格式显示表单输入和验证是极为困难的。
The problem is that the form fields need specific regex validation which worked well when there was only a single input.
问题是，形成领域需要特定的正则表达式验证工作时，只有一个单一的输入。
The problem is that the form fields need specific regex validation which worked well when there was only a single input.
问题是，形成领域需要特定的正则表达式验证工作时，只有一个单一的输入。
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