I have a display:table in my selection list that displays in an IFrame after
the user clicks on a button beside a field in the parent window. The
display:table is built up dynamically from a pre-prepared
displayListDescriptor which has a list of column descriptors (i.e. my JSP
iterates each columnDescriptor item in my
command.displayListDescriptor.displayColumnDescriptors).
I want data from the table row selected to be returned to (potentially
multiple) fields on the parent screen.
Attributes of my Spring Web MVC command object specify:
- which column will be the "link column" so when
command.linkField==columnDescriptor.name, I try to do a href with
onclick="javascript:populate_parent(XXX)" - where XXX would somehow indicate
what value should be assigned to which field
- a returnValueAssignmentPattern (e.g.
"parentUserId=userId;userName=name;someOtherParentField=SomeOtherField"
where the left-hand-side of each assignment represents a field on the parent
object & the right-hand-side of each assignment represents a field on the
object that's being listed in my table.
I assign value="${model.objectsList.list[selection_rowNum-1]}" to a
"tableRow" var (table id="selection")
Previously this was only trying to return the value from the single selected
column - so returnValueAssignmentPattern would have been simply
parentUserId=userId & XXX was the value of the column
${tableRow[columnDescriptor.name]} - userId column in this example.
I am now trying to populate n fields on the parent screen from values in
different columns in the row. I thought I'd try to call the javascript with
onclick="javascript:populate_parent('${returnAssignmentsStr}') where the the
returnAssignmentsStr parameter to the populate_parent() javascript function
looks something like
"parentUserId=CrazyDude;userName=Crazy
Dude;someOtherParentField=SomeOtherValue"
Remember my returnValueAssignmentPattern is
"parentUserId=userId;userName=name;someOtherParentField=SomeOtherField"
Fields on the object being listed in the table would be
- userId=CrazyDude
- name=Crazy Dude
- someOtherField=SomeOtherValue"
I haven't been able to make this work though...
I may need to use Decorators rather than try to do it in the JSP
- I can't use ColumnDecorator as I need information from other columns in
the row.
- I can't work out how to use a TableDecorator though as examples I see (for
example, on
http://displaytag.homeip.net/displaytag-examples-1.1/example-decorator.jsp)
expect that I know the name of the column (date, money etc. in example I
link) & know the object type and write, for example, getDate() or getMoney()
methods that call getCurrentRowObject() & do stuff (knowing what the object
class is). My decorated object could be any of a User DTO, a Product DTO or
any other DTOs in our system - I could probably work something out using
reflection but I feel as though that's going in circles as User.userId was
already easily accessible to me in the JSP by simply saying
${tableRow['userId']}). I've tried some c:forEach looping in the JSP but
don't think I can get it to work in the scope of the display:column tag.
I note that the TableDecorator init takes (PageContext context, Object
decorated, TableModel tableModel) params so there may be something useful I
can do in with PageContext etc. Can I get the object info in a map so I can
still say tableRow['userId'] / tableRow[someColName] & not have to work with
the full object? Thing is that I'm relatively new to JSP/Servlet stuff
(less than a year) & even newer to displaytag library so am not very well
versed in what my options are.
Has anyone written any decorators / tags etc. to solve problems along these
lines? Or am I missing something obvious about how this sort of thing
should be done? Nothing would surprise me!
--
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http://www.nabble.com/Using-Link-on-Column-to-populate-fields-%28plural%21%29-in-parent-screen-tf4811614.html#a13766855
Sent from the DisplayTag - General mailing list archive at Nabble.com.
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