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From Qasim Khawaja <Qasim.Khaw...@admin.ox.ac.uk>
Subject Re: Populating Drop downs
Date Wed, 16 Jul 2003 09:36:01 GMT
Apologies, being dumb. Got it

Qasim Khawaja wrote:

> Aaron,
>
> Thanks that was really useful.
>
> I have one final question, what do you specify in the "input" tag? the 
> Action class name or a ActionForward or what?
>
> Qasim
>
> Aaron Longwell wrote:
>
>> Qasim,
>>
>> I actually use separate actions. I have an edit action, an update 
>> action (which handles both creation of a new record and updating of 
>> an existing record) and a list action (which views data about certain 
>> records):
>>
>> <!-- BAND LIST -->
>> <action path="/band/list" type="dove.struts.actions.BandAction" 
>> parameter="list" validate="false">
>> </action>
>>
>> <!-- BAND CREATE -->
>> <action path="/band/create" type="dove.struts.actions.BandAction" 
>> name="BandForm" scope="request"           parameter="create" 
>> validate="false" input="/WEB-INF/jsp/html/band/edit.jsp">
>> </action>
>>
>> <!-- BAND EDIT -->
>> <action path="/band/edit" type="dove.struts.actions.BandAction" 
>> name="BandForm" scope="request" parameter="edit"       
>> validate="false" input="/WEB-INF/jsp/html/band/edit.jsp">
>> </action>
>>
>> <!-- BAND UPDATE -->
>> <action path="/band/update" type="dove.struts.actions.BandAction" 
>> name="BandForm" scope="request"
>>    parameter="update" validate="true" input="/band/create.action">
>> </action>
>>
>> You'll see I have different actions fronting the same JSP. In 
>> addition I use a practice of hiding the JSPs behind the WEB-INF 
>> directory. The spec indicates that these directories must be 
>> secure.... so nobody can go to a JSP without visitng the action first.
>>
>> A second strategy I use is to build only one action for each of my 
>> sub actions (see the type="") are all identical. To differentiate 
>> which mode the action is in I assign a different parameter attribute 
>> for each. Then within my execute method I check the parameter value:
>>
>> String param = mapping.getParameter();
>>
>> and then route to a private method inside the Action class. This 
>> keeps all the code in one place (in this case, in the BandAction class).
>>
>> Qasim Khawaja wrote:
>>
>>> How do you distinguish the when the execute method is being called 
>>> to populate the form and when it is being called to post the data 
>>> from the form?
>>>
>>> An example for the struts-config would be most useful.
>>>
>>> Q
>>>
>>> Aaron Longwell wrote:
>>>
>>>> The Action is called prior to presenting the JSP only if you've set 
>>>> up:
>>>>
>>>> an action mapping to map the user's URL to a an action
>>>> a forward to the JSP
>>>> and you set the Action's execute method to return a forward to that 
>>>> JSP
>>>>
>>>> The "entry point" into the action is the execute() method which 
>>>> returns an ActionForward object. To create an ActionForward object 
>>>> use code like the following in your execute() method:
>>>>
>>>> return mapping.findForward("name_of_forward");
>>>>
>>>>
>>>>
>>>> Qasim Khawaja wrote:
>>>>
>>>>> I need to populate three drop downs in a jsp before presentation. 
>>>>> Currently I have writted routines in the ActionForm which access 
>>>>> the DAO class and populate the lists. The problem is that the DAO 
>>>>> class throws an exception which means that I have to make my 
>>>>> ActionForm aware of a hibernateException. I want to do this in the 
>>>>> action class and make use of declarative exception handling.
>>>>>
>>>>> Is the Action called prior to presenting the jsp? If so what is 
>>>>> the entry point?
>>>>>
>>>>> Q
>>>>>
>>>>>
>>>>>
>>>>>
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>>>>>
>>>>>
>>>>>
>>>>>
>>>>
>>>>
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>>>>
>>>>
>>>
>>
>>
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>>
>>
>

-- 
======================================
Qasim Khawaja
Computing Officer
Oxford Colleges Admissions Office
University Offices  |
Wellington Square   |T: (01865) 280128
Oxford OX1 2JD	    |F: (01865) 280121
Email: Qasim.Khawaja@admin.ox.ac.uk
======================================




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