RE: Design Question: Forms-and-Validation, which scope to use for dynamic beans?
In your action configuration set the 'input' URL to point to an action instead of your JSP and then build your lists in the action. Steve -Original Message- From: Gino LV. Ledesma [mailto:[EMAIL PROTECTED] Sent: August 10, 2003 10:28 PM To: Struts Users Mailing List Subject: Design Question: Forms-and-Validation, which scope to use for dynamic beans? Hello, I've been using the Struts framework for a couple of months now and have really fancied it. I try as much as possible to adhere to the MVC guidelines, but have run into a couple of problems I've not been able to solve. I have a form which is validated by Struts-validator. One of the form's properties is a pull-down menu which contains list of selectable items. These list of selectable items are generated dynamically (by being called from an EJB). The problem I have is when an error in the form occurs Struts brings back the form page, but the servlet container (Tomcat) then reports a no such bean error -- this bean containing the list of items that populate the pull-down menu. The bean is stored in a request-level scope by the controller servlet. Now when the form is submitted (new request), and an error is found, the form is displayed again. But because the bean was stored in a request-level scope, the bean is no longer found. What is the propery way of fixing this? Currently, I've implemented a tag which generates this list (it basically calls the EJB) and stores it in a page-level scope, so the servlet no longer bothers storing this in any scope. But doesn't doing this break the separate logic from the view rule? I don't want to store it in the session-level scope as well as the list _can_ be updated frequently. Granted, the session-scope seems to be the ideal solution, though. What are your thoughts on this? I'd appreciate help on the matter, as I'm weeding out non-conforming implementations in my code. :) Thanks for your help in advance. = __ Do you Yahoo!? Yahoo! SiteBuilder - Free, easy-to-use web site design software http://sitebuilder.yahoo.com - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Design Question: Forms-and-Validation, which scope to use for dynamic beans?
Hello, I've been using the Struts framework for a couple of months now and have really fancied it. I try as much as possible to adhere to the MVC guidelines, but have run into a couple of problems I've not been able to solve. I have a form which is validated by Struts-validator. One of the form's properties is a pull-down menu which contains list of selectable items. These list of selectable items are generated dynamically (by being called from an EJB). The problem I have is when an error in the form occurs Struts brings back the form page, but the servlet container (Tomcat) then reports a no such bean error -- this bean containing the list of items that populate the pull-down menu. The bean is stored in a request-level scope by the controller servlet. Now when the form is submitted (new request), and an error is found, the form is displayed again. But because the bean was stored in a request-level scope, the bean is no longer found. What is the propery way of fixing this? Currently, I've implemented a tag which generates this list (it basically calls the EJB) and stores it in a page-level scope, so the servlet no longer bothers storing this in any scope. But doesn't doing this break the separate logic from the view rule? I don't want to store it in the session-level scope as well as the list _can_ be updated frequently. Granted, the session-scope seems to be the ideal solution, though. What are your thoughts on this? I'd appreciate help on the matter, as I'm weeding out non-conforming implementations in my code. :) Thanks for your help in advance. = __ Do you Yahoo!? Yahoo! SiteBuilder - Free, easy-to-use web site design software http://sitebuilder.yahoo.com - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: Design Question: Forms-and-Validation, which scope to use for dynamic beans?
Thanks for the quick reply. Does this work if the action requires additional request parameters, however? Not that my particular servlet will require it, but some of them do. For example, say I have something like: /createObjectB.do?parentID=1 Where ObjectB has ObjectA for its parent (and is necessary for the creation to filter its attributes). Gino LV. Ledesma Ateneo de Manila University // Programmer's Excuse #4: It was working yesterday. --- Steve Raeburn [EMAIL PROTECTED] wrote: In your action configuration set the 'input' URL to point to an action instead of your JSP and then build your lists in the action. Steve -Original Message- From: Gino LV. Ledesma [mailto:[EMAIL PROTECTED] Sent: August 10, 2003 10:28 PM To: Struts Users Mailing List Subject: Design Question: Forms-and-Validation, which scope to use for dynamic beans? Hello, I've been using the Struts framework for a couple of months now and have really fancied it. I try as much as possible to adhere to the MVC guidelines, but have run into a couple of problems I've not been able to solve. I have a form which is validated by Struts-validator. One of the form's properties is a pull-down menu which contains list of selectable items. These list of selectable items are generated dynamically (by being called from an EJB). The problem I have is when an error in the form occurs Struts brings back the form page, but the servlet container (Tomcat) then reports a no such bean error -- this bean containing the list of items that populate the pull-down menu. The bean is stored in a request-level scope by the controller servlet. Now when the form is submitted (new request), and an error is found, the form is displayed again. But because the bean was stored in a request-level scope, the bean is no longer found. What is the propery way of fixing this? Currently, I've implemented a tag which generates this list (it basically calls the EJB) and stores it in a page-level scope, so the servlet no longer bothers storing this in any scope. But doesn't doing this break the separate logic from the view rule? I don't want to store it in the session-level scope as well as the list _can_ be updated frequently. Granted, the session-scope seems to be the ideal solution, though. What are your thoughts on this? I'd appreciate help on the matter, as I'm weeding out non-conforming implementations in my code. :) Thanks for your help in advance. = __ Do you Yahoo!? Yahoo! SiteBuilder - Free, easy-to-use web site design software http://sitebuilder.yahoo.com - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] = __ Do you Yahoo!? Yahoo! SiteBuilder - Free, easy-to-use web site design software http://sitebuilder.yahoo.com - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
