Configuring Validation Rules for JavaScript in Struts: A Comprehensive Guide, Slides of Java Programming

Download Configuring Validation Rules for JavaScript in Struts: A Comprehensive Guide and more Slides Java Programming in PDF only on Docsity! Configuring validation-rules.xml for JavaScript  A custom tag is used to generate client-side validation based on a javascript attribute being present within the <validator> element in the validation-rules.xml file  Use the custom tag in your JSP page  The text from <javascript> element is written to the JSP page to provide client-side validation docsity.com Configuring validation-rules.xml for JavaScript <form-validation> <global> <validator name="required" classname="org.apache.struts.validator.FieldChecks" method="validateRequired" methodParams="java.lang.Object, org.apache.commons.validator.ValidatorAction, org.apache.commons.validator.Field, org.apache.struts.action.ActionErrors, javax.servlet.http.HttpServletRequest" msg="errors.required“> <javascript><![CDATA[ function validateRequired(form) { var isValid = true; ... </javascript> </validator> docsity.com logon.jsp Page (from struts-example sample code)‏ <html:javascript formName="logonForm" dynamicJavascript="true" staticJavascript="false"/> <script language="Javascript1.1" src="staticJavascript.jsp"> </script> docsity.com Things You Have to Do in your JSP Page  You will have to add an onsubmit event handler for the form manually  When the form is submitted, the validateLogonForm( ) JavaScript function will be invoked  The validation rules will be executed, and if one or more rules fail, the form will not be submitted. docsity.com Things You Have to Do in your JSP Page  The <html:javascript> tag generates a function with the name validateXXX( ) , where XXX is the name of the ActionForm  Thus, if your ActionForm is called logonForm, the javascript tag will create a JavaScript function called validateLogonForm( ) that executes the validation logic  This is why the onsubmit( ) event handler called the validateLogonForm( ) function. docsity.com Advanced Features  Creating custom validation rules  Using programmatic validation along with Validator docsity.com Creating Custom Validation Rules  Create a new validation method  Modify the validation-rules.xml file to rules. xml contain the new validation method  Modify the validation.xml file to use the new validation rule rule. docsity.com Creating Custom Validation Rules  Create a new validation method  Modify the validation-rules.xml file to rules. xml contain the new validation method  Modify the validation.xml file to use the new validation rule rule. docsity.com Me Best Practice Guidelines ® docsity.com Best Practice Guidelines  Separate validation XML configuration files for each major functional areas of your application  Configure them in a similar manner in which multiple Struts configuration files are configured docsity.com Advaced Validation Techniques (From Struts Cookbook written by Bill Siggelkow)‏ docsity.com