How Struts validation framework performs the required validation?
At the Struts core, we have the validation framework that assists the application to run the rules to perform validation before the action method is executed. Client side validation is usually achieved using Javascript. However, one should not rely upon client side validation alone.
What is Struts 1 framework based on?
What is Struts? Struts is a framework based on set of Java technologies like Servlet, JSP, JSTL, XML etc which provides implementation of MVC architecture. The framework also provides ready to use validation framework.
Which file contains JavaScript for client side validation using validation in Struts?
The validator-rules. xml file also defines client-side JavaScript code for each validation routine. Validator can be configured to send this JavaScript code to the browser so that validations are performed on the client side as well as on the server side. The second configuration file, validation.
What are the features of Struts framework?
The important features of struts 2 framework are as follows:
- Configurable MVC components.
- POJO based actions.
- AJAX support.
- Integration support.
- Various Result Types.
- Various Tag support.
- Theme and Template support.
What is validation framework?
The validation framework uses Spring’s powerful expression evaluation engine to evaluate both validation rules and applicability conditions for the validator. As such, any valid Spring expression can be specified within the test and when attributes of any validator.
What are the benefits of struts framework?
Advantages of Struts. Since Struts follow MVC framework, Java, JSP and Action classes are highly maintained and easy to understand for developers. The development time is less and this creates an advantage for the application developers. It is easy to maintain the applications due to the MVC framework.
What is Struts2 framework?
Apache Struts 2 is an elegant, extensible framework for creating enterprise-ready Java web applications. This framework is designed to streamline the full development cycle from building, to deploying and maintaining applications over time. Apache Struts 2 was originally known as Web Work 2.
How does the struts validator framework work in Java?
The Validator Framework uses two XML configuration files validator-rules.xml and validation.xml. The validator-rules.xml defines the standard validation routines, these are reusable and used in validation.xml . to define the form specific validations. The validation.xml defines the validations applied to a form bean.
What do you need to know about Struts 2?
Struts2 XML based validation provides more options of validation like email validation, integer range validation, form validation field, expression validation, regex validation, required validation, requiredstring validation, stringlength validation and etc. The xml file needs to be named ‘ [action-class]’-validation.xml.
How does the addfielderror method work in struts?
The addFieldError method takes two arguments. The first, is the form field name to which the error applies and the second, is the error message to display above that form field. To handle the return value of input we need to add the following result to our action node in struts.xml.
Why do you need an XML file for validation?
The advantage of having an xml file to store the configuration allows the separation of the validation from the application code. You could get a developer to write the code and a business analyst to create the validation xml files. Another thing to note is the validator types that are available by default.
