Re: Re: Nested Tags question
So Craig, does the process work at submit time (when the request parameters are being put into the nested beans) via calls to the getter methods to get the beans on which the parameters have to be set? I can't see how else it would work. Adam Craig R. McClanahan [EMAIL PROTECTED] schrieb am 13.06.2002, 08:22:43: On Thu, 13 Jun 2002, Arron Bates wrote: Date: Thu, 13 Jun 2002 14:14:13 +1000 From: Arron Bates Reply-To: Struts Users Mailing List To: Struts Users Mailing List Subject: Re: Nested Tags question I know JSP will automatically save parameters to a javabean with the correctly named getters and setters, but there's obviously a gap in my knowledge because all my attempts to recreate the situation above have failed. Setting form properties against beans is a Struts thing, not a JSP thing. The property thing is a Bean thin and can be looked up in the JavaBean spec. The example you quote... monkeyTeamAlpha.monkeyWorkers[0].salary ...is a nested property. An invention implemented within Struts (Craig?). Yep, although in Struts 1.1 it is really a commons-beanutils thing because we abstracted out this generally useful code into a separate package. What it basically is, is a string of calls rather than the single property method. Here, it will get a hold of the form bean, get a hold of the bean returned from the monkeyTeamAlphaproperty. On this bean, it will invoke the indexed property monkeyWorkers[0] which will pluck a bean from a collection or index provided, from this last bean it will will get a hold of its salary property, and set the value. At each stage, you also get the benefit of some intelligence that is built in to the underlying PropertyUtils class. For example, the JavaBeans spec defines two ways to define an indexed property -- you can use getter and setter methods that take a value and a subscript, or you can use getter and setter methods that return the entire array. PropertyUtils makes the expression listed above work for either (or even for a property whose value is a java.util.List, which is an extension to the JavaBeans spec). All this boils down to, is that you can compose objects a little cleaner, rather than have truly enormous beans for everything. Having the indexed properties allows for lists and whatever else. The ability for nesting beans has been in Struts for a long time. The nested tags just make it much easier. There's a primer and tutorial for nested beans here... http://www.keyboardmonkey.com/next ...it should take you over creating and using such a construct. Hope this gets you on th path you're after. Another area of useful learning for the future is the JSP Standard Tag Library (JSTL). Although the expression language syntax supported by JSTL is different from the one in Struts, it is well worth learning about -- this expression language will be supported anywhere in a JSP page in JSP 1.3, and (in the mean time) we will likely adapt Struts tags to be able to use it as well. Arron. Craig -- To unsubscribe, e-mail: For additional commands, e-mail: -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL PROTECTED]
Re: Re: Nested Tags question
On Thu, 13 Jun 2002 [EMAIL PROTECTED] wrote: Date: Thu, 13 Jun 2002 11:43:59 +0200 From: [EMAIL PROTECTED] Reply-To: Struts Users Mailing List [EMAIL PROTECTED] To: Struts Users Mailing List [EMAIL PROTECTED] Subject: Re: Re: Nested Tags question So Craig, does the process work at submit time (when the request parameters are being put into the nested beans) via calls to the getter methods to get the beans on which the parameters have to be set? I can't see how else it would work. It depends on what context you are using the expressions in. For example: !-- Assume the form bean name is customerForm -- html:form action=/editCustomer ... html:text property=mailingAddress.city/ ... /html:form will, in effect, do a call to: customerForm.getMailingAddress().getCity() when the page is displayed, and a call to: customerForm.getMailingAddress().setCity() when the request parameters are being copied in to the form bean. Adam Craig Craig R. McClanahan [EMAIL PROTECTED] schrieb am 13.06.2002, 08:22:43: On Thu, 13 Jun 2002, Arron Bates wrote: Date: Thu, 13 Jun 2002 14:14:13 +1000 From: Arron Bates Reply-To: Struts Users Mailing List To: Struts Users Mailing List Subject: Re: Nested Tags question I know JSP will automatically save parameters to a javabean with the correctly named getters and setters, but there's obviously a gap in my knowledge because all my attempts to recreate the situation above have failed. Setting form properties against beans is a Struts thing, not a JSP thing. The property thing is a Bean thin and can be looked up in the JavaBean spec. The example you quote... monkeyTeamAlpha.monkeyWorkers[0].salary ...is a nested property. An invention implemented within Struts (Craig?). Yep, although in Struts 1.1 it is really a commons-beanutils thing because we abstracted out this generally useful code into a separate package. What it basically is, is a string of calls rather than the single property method. Here, it will get a hold of the form bean, get a hold of the bean returned from the monkeyTeamAlphaproperty. On this bean, it will invoke the indexed property monkeyWorkers[0] which will pluck a bean from a collection or index provided, from this last bean it will will get a hold of its salary property, and set the value. At each stage, you also get the benefit of some intelligence that is built in to the underlying PropertyUtils class. For example, the JavaBeans spec defines two ways to define an indexed property -- you can use getter and setter methods that take a value and a subscript, or you can use getter and setter methods that return the entire array. PropertyUtils makes the expression listed above work for either (or even for a property whose value is a java.util.List, which is an extension to the JavaBeans spec). All this boils down to, is that you can compose objects a little cleaner, rather than have truly enormous beans for everything. Having the indexed properties allows for lists and whatever else. The ability for nesting beans has been in Struts for a long time. The nested tags just make it much easier. There's a primer and tutorial for nested beans here... http://www.keyboardmonkey.com/next ...it should take you over creating and using such a construct. Hope this gets you on th path you're after. Another area of useful learning for the future is the JSP Standard Tag Library (JSTL). Although the expression language syntax supported by JSTL is different from the one in Struts, it is well worth learning about -- this expression language will be supported anywhere in a JSP page in JSP 1.3, and (in the mean time) we will likely adapt Struts tags to be able to use it as well. Arron. Craig -- To unsubscribe, e-mail: For additional commands, e-mail: -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL PROTECTED] -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL PROTECTED]
RE: Re: Nested Tags question
When I use nested tags, I am not able to access it through java scripts since the name is mailingAddress.city. Does anyone have a work around or am I missing something? Jayaraman -Original Message- From: Craig R. McClanahan [mailto:[EMAIL PROTECTED]] Sent: Thursday, June 13, 2002 12:23 PM To: Struts Users Mailing List Subject: Re: Re: Nested Tags question On Thu, 13 Jun 2002 [EMAIL PROTECTED] wrote: Date: Thu, 13 Jun 2002 11:43:59 +0200 From: [EMAIL PROTECTED] Reply-To: Struts Users Mailing List [EMAIL PROTECTED] To: Struts Users Mailing List [EMAIL PROTECTED] Subject: Re: Re: Nested Tags question So Craig, does the process work at submit time (when the request parameters are being put into the nested beans) via calls to the getter methods to get the beans on which the parameters have to be set? I can't see how else it would work. It depends on what context you are using the expressions in. For example: !-- Assume the form bean name is customerForm -- html:form action=/editCustomer ... html:text property=mailingAddress.city/ ... /html:form will, in effect, do a call to: customerForm.getMailingAddress().getCity() when the page is displayed, and a call to: customerForm.getMailingAddress().setCity() when the request parameters are being copied in to the form bean. Adam Craig Craig R. McClanahan [EMAIL PROTECTED] schrieb am 13.06.2002, 08:22:43: On Thu, 13 Jun 2002, Arron Bates wrote: Date: Thu, 13 Jun 2002 14:14:13 +1000 From: Arron Bates Reply-To: Struts Users Mailing List To: Struts Users Mailing List Subject: Re: Nested Tags question I know JSP will automatically save parameters to a javabean with the correctly named getters and setters, but there's obviously a gap in my knowledge because all my attempts to recreate the situation above have failed. Setting form properties against beans is a Struts thing, not a JSP thing. The property thing is a Bean thin and can be looked up in the JavaBean spec. The example you quote... monkeyTeamAlpha.monkeyWorkers[0].salary ...is a nested property. An invention implemented within Struts (Craig?). Yep, although in Struts 1.1 it is really a commons-beanutils thing because we abstracted out this generally useful code into a separate package. What it basically is, is a string of calls rather than the single property method. Here, it will get a hold of the form bean, get a hold of the bean returned from the monkeyTeamAlphaproperty. On this bean, it will invoke the indexed property monkeyWorkers[0] which will pluck a bean from a collection or index provided, from this last bean it will will get a hold of its salary property, and set the value. At each stage, you also get the benefit of some intelligence that is built in to the underlying PropertyUtils class. For example, the JavaBeans spec defines two ways to define an indexed property -- you can use getter and setter methods that take a value and a subscript, or you can use getter and setter methods that return the entire array. PropertyUtils makes the expression listed above work for either (or even for a property whose value is a java.util.List, which is an extension to the JavaBeans spec). All this boils down to, is that you can compose objects a little cleaner, rather than have truly enormous beans for everything. Having the indexed properties allows for lists and whatever else. The ability for nesting beans has been in Struts for a long time. The nested tags just make it much easier. There's a primer and tutorial for nested beans here... http://www.keyboardmonkey.com/next ...it should take you over creating and using such a construct. Hope this gets you on th path you're after. Another area of useful learning for the future is the JSP Standard Tag Library (JSTL). Although the expression language syntax supported by JSTL is different from the one in Struts, it is well worth learning about -- this expression language will be supported anywhere in a JSP page in JSP 1.3, and (in the mean time) we will likely adapt Struts tags to be able to use it as well. Arron. Craig -- To unsubscribe, e-mail: For additional commands, e-mail: -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL PROTECTED] -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL PROTECTED] -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL PROTECTED]
