Validator client verification

Name attribute indicates which ActionForm we will verify, this name must be defined in struts-config.xml, and our userform includes two attributes Name and Email, Define the properties bar to verify Bit, Depends defines the verifier used, the Required verifier checks if the field is filled out, if not, it will use the message in Application.properties: On the Validation.xml setting, you can define some constants for convenience Used during the setting, such as the regular expression of Mask, for example: validation.xml code: email ^ [_ a-z0-9- ] (. [_ A-Z0-9 -] ) * @ [A-Z0-9 -] (. [A-Z0-9 -] ) * $ < / global> mask $ {email} Defines constants that it will be convenient to manage. If you want to change the Regular Expression in the future, just change the settings in the constant.

Application.properties code: # - validator - errors.invalid = {0} is invalid. ..... # - display - logon.usename.displayName = username logon.email.displayName = Email You can save Struts -blank Application.properties copy, there is a # - validator - the verification message under the Validator will be used for the validator, and the arg0 will replace the text in {0}. If you specify more than two verifiers in Depends, it will be used sequentially. If there is a verification, it will stop verify and make a correlation response, and the Mask verifier is used to verify whether the input field is in line with our setting format. , Use regular expression to set the verification format. Validator's client authentication is to verify using JavaScript. Verification rules are defined in Validator-Rules.xml. If you are interested, you can see how JavaScript is verified, we can use tab To write the necessary JavaScript, an example is as follows:

Login.jsp code: <% @ Taglib URI = "/ tags / struts-bean" prefix = "bean"%> <% @ Taglib URI = "/ tags / struts-html" prefix = "html"%> <% @ Page ContentType = "Text / HTML; Charset = BIG5"%>