The validator XML file should contain validator forms for all of the form fields for a Struts Action Form bean.The following file for the Registration Form class contains validator forms for all of the form fields.Ideally, at the end of this exercise you should be able to understand your users’ interests and motivations better, and hone in on a small group of people who feel enough pain to buy your product.Also, if done right, you’ll be able to use what you’ve learned to find similar (or parallel) markets to expand into in the future.And, in the remote case that you’ve been living under a rock and the whole lean startup movement somehow got past you, this post will try to bring you up to speed (and possibly, get you slightly ahead of the pack), provided you force yourself and your team to take action! Validating demand and validating the problem come first.Then you come up with a solution (a prototype or design of your product) to solve the problem that you have identified.Sending data is not enough — we also need to make sure that the data users fill out in forms is in the correct format we need to process it successfully, and that it won't break our applications.
Indeed, most developers creating rich Web applications know that reliable scripting needs the document to be parsed by User-Agents without any unexpected error, and will make sure that their markup and CSS is validated before creating a rich interactive layer.
However, in the previous example the validator XML file, validator.xml, does not provide validators for all of the form fields in the Registration Form.
Validator forms are only provided for the first five of the seven form fields.
Though for the datetime and date validator to you need to specify a parse and format function and for that you most likely will want to use a library, is highly recommended.
If you want to use async validation you need to use a runtime that supports Promises.