hi shirish, great conceipt and many thanks for example and explanation, my fog seems to thin out slowly. one question remains: as soon as a new form is created, then, i assume, the user's inputs are lost. so how do you get hold of the user's input? usually one feeds the input data back into a database. with simple beans i copy the formdata to a new instantiated dto-bean within my action class and pass the dto-bean to my business-layer. but dealing with nested beans, where and how? sorry for pestering and thanks a lot in advance martin
---------- Urspruengliche Nachricht ------------------------------ Von: <[EMAIL PROTECTED]> Antworten an: "Struts Users Mailing List" <[EMAIL PROTECTED]> Datum: Tue, 20 Jan 2004 13:54:30 +0100 >yes:-)) >And I am sure most of the people do have the same.I mean tieing the nested properties >to the session scope does take away a lot of flexibility. > >Anyhow just try my sample code...It should demonstrate the concept. > >regards, >Shirish > >-----Original Message----- >From: Mark Lowe [mailto:[EMAIL PROTECTED] >Sent: Tuesday, January 20, 2004 1:44 PM >To: Struts Users Mailing List >Subject: Re: getting data from form with nested beans > > >So you've had forms, with indexed properties with dynamic sizes working >when scoping to request? > > >On 20 Jan 2004, at 11:45, <[EMAIL PROTECTED]> wrote: > >> Hi, >> Is it flaming or what?I thought we were trying to solve each others >> problems.Still a last try. >> We have a complete application(3 modules/4000 classes/15 companies >> live as of date) which uses all form beans just in request scope.And >> all over the place we have used form beans in request scope.And the >> application is well and running. >> >> If you go t through my mail, you will understand why it will mail.SO >> please read the mail carefully. >> I will try to explain it again. >> >> When the form is submitted(the user presses submit button on >> screen),the corresponding action will be called by struts.At the same >> time, it will look for a actionForm from the mapping.As the scope is >> specified as request, a new form will be created.And if you have >> looked at my example carefully, you will see that the nested bean list >> is created when the form is created.But this nested list is empty.Now >> when struts autopopulation tries to populate a nested bean, it should >> find that the nested bean list is empty.But the lazy initialization >> mechanism in the indexed getter will take care that the list has >> enough of beans.See the code below. >> ****************33 >> //give indexed access to the beans >>>>> >>>>> public Employee getEmployee(int index){ >>>>> >>>>> //very imp >>>>> >>>>> //when a jsp is submited , then while auto populating the form,this >>>>> will >>>>> ensure >>>>> that >>>>> >>>>> // the form is populated properly. >>>>> >>>>> while(index >= beanList.size()){ >>>>> >>>>> beanList.add(new Employee()); >>>>> >>>>> } >> *************************************** >> >> And as explained in jsp part, as long as the property references are >> created properly, this will work.And with struts1.1 nested tags, you >> don't have to even use the script<%%> to create property is jsp. >> >> Hope this clarifies it.If not, try to run my example code. >> >> regards, >> Shirish >> >> -----Original Message----- >> From: Mark Lowe [mailto:[EMAIL PROTECTED] >> Sent: Tuesday, January 20, 2004 12:28 PM >> To: Struts Users Mailing List >> Subject: Re: getting data from form with nested beans >> >> >> Oh yeah .. by working i mean when you submit.. >> >> >> On 20 Jan 2004, at 11:25, Mark Lowe wrote: >> >>> .. Show us all an example of a form with a dynamic size for a form >>> property thats scoped to the request then big shot.. >>> >>> Come on lets see it!!! >>> >>> >>> On 20 Jan 2004, at 10:45, <[EMAIL PROTECTED]> wrote: >>> >>>> The scope of form has nothing to do with usage of nested beans.And >>>> using session scope shoudl be avaided as far as possible as teh form >>>> will stay in session till it is explicitely removed from there.. >>>> >>>> The <% %> business is for the scripts so that the nested property >>>> reference can be created.But with struts1.1 , with the usage of >>>> nested tags, oyu can get rid of that scriptlet code.See nested tags >>>> for how to do that.I have myself never used nested tags. >>>> >>>> >>>> -----Original Message----- >>>> From: Mark Lowe [mailto:[EMAIL PROTECTED] >>>> Sent: Tuesday, January 20, 2004 11:05 AM >>>> To: Struts Users Mailing List >>>> Subject: Re: getting data from form with nested beans >>>> >>>> >>>> What's with all the <% %> business? Things to watch out for, method >>>> names and the object cast to the jsp need to match names (e.g. >>>> foo.getEmployee() and ${foo.employee}). The form must be scoped to >>>> session if you are dynamically changing the size of the indexed >>>> property. >>>> >>>> <html:text name="bean" property="property" indexed="true" /> >>>> >>>> A better example would be a form bean with a getEmployees() method >>>> and >>>> a setEmployee rather than getBeanList or whatever it was. >>>> >>>> >>>> public Object[] getEmployees() { >>>> return emplyeeList.toArray(); >>>> } >>>> >>>> public void setEmployees(ArrayList employeeList) { >>>> this.employeeList = employeeList; >>>> } >>>> >>>> public Employee getEmployee(int i) { >>>> return (Employee) employeeList.get(i); >>>> } >>>> >>>> public void setEmployee(int i,Employee employee) { >>>> this.employeeList.add(i,employee); >>>> } >>>> >>>> >>>> .. >>>> >>>> public class Employee { >>>> private String name; >>>> >>>> public String getName() { >>>> return name; >>>> } >>>> etc >>>> } >>>> >>>> .. >>>> >>>> <logic:iterate id="employee" name="employeeForm" >>>> property="employees"> >>>> >>>> <html:"text name="employee" property="name" indexed="true" /> >>>> >>>> </logic:iterate> >>>> >>>> or >>>> >>>> <c:forEach var="employee" items="${employeeForm.employees}"> >>>> .. >>>> >>>> >>>> >>>> On 20 Jan 2004, at 08:56, <[EMAIL PROTECTED]> wrote: >>>> >>>>> I am resending my earlier mail on this user list..Go through the >>>>> sample code >>>>> and >>>>> ask me if u don't understand something. >>>>> >>>>> The important portions are commented.Especially look at the jsps >>>>> property >>>>> how >>>>> it is set and also the form bean.The property syntax I have used was >>>>> for struts 1.0 ..But with struts 1.1 , you can have a better cleaner >>>>> syntax using nested tags.But I have not used it...This works for 1.1 >>>>> as well.. >>>>> >>>>> ******************************************************** >>>>> >>>>> //Form Class >>>>> >>>>> import java.util.ArrayList; >>>>> >>>>> import java.util.List; >>>>> >>>>> import org.apache.struts.action.ActionForm; >>>>> >>>>> public class ExampleListForm extends ActionForm { >>>>> >>>>> //A list of Emp beans >>>>> >>>>> private List beanList = new ArrayList(); >>>>> >>>>> public List getBeanList(){ >>>>> >>>>> return beanList; >>>>> >>>>> } >>>>> >>>>> public void setBeanList(List list){ >>>>> >>>>> beanList = list; >>>>> >>>>> } >>>>> >>>>> //very imp. >>>>> >>>>> //give indexed access to the beans >>>>> >>>>> public Employee getEmployee(int index){ >>>>> >>>>> //very imp >>>>> >>>>> //when a jsp is submited , then while auto populating the form,this >>>>> will >>>>> ensure >>>>> that >>>>> >>>>> // the form is populated properly. >>>>> >>>>> while(index >= beanList.size()){ >>>>> >>>>> beanList.add(new Employee()); >>>>> >>>>> } >>>>> >>>>> return (Employee)beanList.get(index); >>>>> >>>>> } >>>>> >>>>> public void setEmployee(int index,Employee emp){ >>>>> >>>>> beanList.set(index,emp); >>>>> >>>>> } >>>>> >>>>> } >>>>> >>>>> *********************************************** >>>>> >>>>> Bean class >>>>> >>>>> public class Employee { >>>>> >>>>> private String name; >>>>> >>>>> private String salary; >>>>> >>>>> /** >>>>> >>>>> * Returns the name. >>>>> >>>>> * @return String >>>>> >>>>> */ >>>>> >>>>> public String getName() { >>>>> >>>>> return name; >>>>> >>>>> } >>>>> >>>>> /** >>>>> >>>>> * Returns the salary. >>>>> >>>>> * @return String >>>>> >>>>> */ >>>>> >>>>> public String getSalary() { >>>>> >>>>> return salary; >>>>> >>>>> } >>>>> >>>>> /** >>>>> >>>>> * Sets the name. >>>>> >>>>> * @param name The name to set >>>>> >>>>> */ >>>>> >>>>> public void setName(String name) { >>>>> >>>>> this.name = name; >>>>> >>>>> } >>>>> >>>>> /** >>>>> >>>>> * Sets the salary. >>>>> >>>>> * @param salary The salary to set >>>>> >>>>> */ >>>>> >>>>> public void setSalary(String salary) { >>>>> >>>>> this.salary = salary; >>>>> >>>>> } >>>>> >>>>> } >>>>> >>>>> **************************************** >>>>> >>>>> JSP >>>>> >>>>> <%@ page language="java"%> >>>>> >>>>> <%@ taglib uri="/WEB-INF/struts-html.tld" prefix="html" %> >>>>> >>>>> <html:html> >>>>> >>>>> <html:form action="/" > >>>>> >>>>> <logic:iterate id="bean" name="exampleListForm" property="beanList" >>>>> indexId="i"/> >>>>> >>>>> <html:text name="exampleListForm" property="<%=\"employee[\" + i >>>>> \"].name\"%>"> >>>>> >>>>> <html:text name="exampleListForm" property="<%=\"employee[\" + i >>>>> \"].salary\"%>"> >>>>> >>>>> </logic:iterate> >>>>> >>>>> </html:form> >>>>> >>>>> </html:html> >>>>> >>>>> Explanation: >>>>> >>>>> See how the property is constructed. >>>>> >>>>> <html:text name="exampleListForm" property="<%=\"employee[\" + i >>>>> \"].name\"%>"> >>>>> >>>>> So this will result in a parameter name employee[i].name in the http >>>>> request.So >>>>> when the jsp is rendered, this will be interpreted as >>>>> >>>>> getEmployee[i].getName().And when the jsp is submitted , the same >>>>> will >>>>> be >>>>> interpreted as getEmployee[i].setName().And this will result in auto >>>>> population >>>>> of data in the form as u can see. >>>>> >>>>> So check the indexed properties on the form as well.(Especially the >>>>> getEmployee(index i) proeprty with while loop.) >>>>> >>>>> Hope this helps. >>>>> >>>>> >>>>> >>>>> regards, >>>>> >>>>> Shirish. >>>>> >>>>> >>>>> -----Original Message----- >>>>> From: Mark Lowe [mailto:[EMAIL PROTECTED] >>>>> Sent: Monday, January 19, 2004 6:18 PM >>>>> To: Struts Users Mailing List >>>>> Subject: Re: getting data from form with nested beans >>>>> >>>>> >>>>> Dunno what that thread on lazy lists was but nesting beans should >>>>> work >>>>> fine, but you will need to scope any property that you want a >>>>> dynamic >>>>> size to session. >>>>> >>>>> Shouldn't be anymore complicated than that. >>>>> >>>>> >>>>> On 19 Jan 2004, at 16:01, Martin Sturzenegger wrote: >>>>> >>>>>> hi, >>>>>> concerning nested properties, i found so many questions, hints etc. >>>>>> in >>>>>> the archive but nothing that really helped all the way...i'm still >>>>>> confused (or even more now...) >>>>>> i still don't understand how struts handles input from a form that >>>>>> holds an iteration of nested beans. >>>>>> is the following correct? >>>>>> as soon as the user submits the form, the actionform-bean, holding >>>>>> the >>>>>> nested beans with the user's changes, gets transmitted. >>>>>> is it so, that before the action-class is called, the form-bean's >>>>>> reset() method is called, and all nested beans are set to null by >>>>>> default? >>>>>> so do i have to override the reset() method? >>>>>> what do i iterate over in the reset() method to get the user's >>>>>> inputs? >>>>>> how do i limit the iteration? >>>>>> does the validate() method gets called before the reset method?. >>>>>> >>>>>> i've seen examples, where a dto-class is instanciated within the >>>>>> reset() method. >>>>>> is this the way to do it? >>>>>> do i have to access these dto-beans in the action class? >>>>>> >>>>>> could somebody give me a little example of a reset()-method, just >>>>>> to >>>>>> show how the user's input can be gathered and then stored away? >>>>>> >>>>>> and.. what are lazy lists? i wasn't able to find a definition.... >>>>>> >>>>>> sorry about it but >>>>>> >>>>>> regards from an utterly confused martin >>>>>> >>>>>> >>>>>> >>>>>> >>>>>> ---------- Urspruengliche Nachricht ------------------------------ >>>>>> Von: <[EMAIL PROTECTED]> >>>>>> Datum: Mon, 19 Jan 2004 10:52:10 +0100 >>>>>> >>>>>>> You ahve a fixed length or Empty list in the form.So when the auto >>>>>>> population tries to populate the nested bean for the list which is >>>>>>> empty/fixed size,you get this exception. >>>>>>> Try to use lazy list or search the archive for nested property >>>>>>> usage...There are many examples which will demonatrate how to use >>>>>>> it. >>>>>>> >>>>>>> HTH. >>>>>>> regards, >>>>>>> Shirish >>>>>>> >>>>>>> -----Original Message----- >>>>>>> From: Martin Sturzenegger >>>>>>> [mailto:[EMAIL PROTECTED] >>>>>>> Sent: Monday, January 19, 2004 10:46 AM >>>>>>> To: Struts Users Mailing List; [EMAIL PROTECTED]; Struts >>>>>>> Users >>>>>>> Mailing List >>>>>>> Subject: Re: Including one JSP in another >>>>>>> >>>>>>> >>>>>>> i try to receive user-input from a form using a list of nested >>>>>>> beans. >>>>>>> after hitting submit i get an ArrayIndexOutOfBoundsException >>>>>>> can somebody give me a hint? >>>>>>> many thanks >>>>>>> martin >>>>>>> >>>>>>> >>>>>>> >>>>>>> >>>>>>> stacktrace: >>>>>>> >>>>>>> java.lang.ArrayIndexOutOfBoundsException >>>>>>> java.lang.reflect.Array.get(Native Method) >>>>>>> >>>>>>> org.apache.commons.beanutils.PropertyUtils.getIndexedProperty(Prop >>>>>>> e >>>>>>> rt >>>>>>> y >>>>>>> Utils.java:525) >>>>>>> >>>>>>> org.apache.commons.beanutils.PropertyUtils.getIndexedProperty(Prop >>>>>>> e >>>>>>> rt >>>>>>> y >>>>>>> Utils.java:428) >>>>>>> >>>>>>> org.apache.commons.beanutils.PropertyUtils.getNestedProperty(Prope >>>>>>> r >>>>>>> ty >>>>>>> U >>>>>>> tils.java:770) >>>>>>> >>>>>>> org.apache.commons.beanutils.PropertyUtils.getProperty(PropertyUti >>>>>>> l >>>>>>> s. >>>>>>> j >>>>>>> ava:801) >>>>>>> >>>>>>> org.apache.commons.beanutils.BeanUtils.setProperty(BeanUtils.java: >>>>>>> 881) >>>>>>> org.apache.commons.beanutils.BeanUtils.populate(BeanUtils.java: >>>>>>> 808) >>>>>>> org.apache.struts.util.RequestUtils.populate(RequestUtils.java: >>>>>>> 1252) >>>>>>> >>>>>>> org.apache.struts.action.RequestProcessor.processPopulate(RequestP >>>>>>> r >>>>>>> oc >>>>>>> e >>>>>>> ssor.java:821) >>>>>>> >>>>>>> org.apache.struts.action.RequestProcessor.process(RequestProcessor >>>>>>> . >>>>>>> ja >>>>>>> v >>>>>>> a:254) >>>>>>> >>>>>>> org.apache.struts.action.ActionServlet.process(ActionServlet.java: >>>>>>> 1482) >>>>>>> org.apache.struts.action.ActionServlet.doPost(ActionServlet.java: >>>>>>> 525) >>>>>>> javax.servlet.http.HttpServlet.service(HttpServlet.java:763) >>>>>>> javax.servlet.http.HttpServlet.service(HttpServlet.java:856) >>>>>>> >>>>>>> >>>>>>> >>>>>>> >>>>>>>>>>> >>>>>>>>>>> Confidentiality Notice >>>>>>>>>>> >>>>>>>>>>> The information contained in this electronic message and any >>>>>>>> attachments >>>>>>>>>>> to this message are intended >>>>>>>>>>> for the exclusive use of the addressee(s) and may contain >>>>>>>>>>> confidential >>>>>>>>>>> or privileged information. 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