Further to this (still can't save drop down list changes :-( ), I have
an example where an object x contains an object y that can be selected
using a drop down list, but y is currently null as I haven't added it to
x yet (would be done using the drop down list).
Is the trick here to create y in the formBackingObject and set the id to
-1? Currently I get a null pointer in the property editor, presumably
as its trying to compare the id or name of a null object.
Aled Rhys Jones wrote:
Thanks for the replies Mike.
Two issues with the below is that it doesn't seem to like me using
spring:form. Everything else seems to be form:form which seems to work.
I therefore tried the below using form:select, and I get the following
exception:
java.lang.NullPointerException
at
org.springframework.web.servlet.tags.form.SelectedValueComparator.exhaustiveCompare(SelectedValueComparator.java:154)
at
org.springframework.web.servlet.tags.form.SelectedValueComparator.isSelected(SelectedValueComparator.java:90)
at
org.springframework.web.servlet.tags.form.OptionWriter.isSelected(OptionWriter.java:184)
at
org.springframework.web.servlet.tags.form.OptionWriter.renderOption(OptionWriter.java:172)
at
org.springframework.web.servlet.tags.form.OptionWriter.doRenderFromCollection(OptionWriter.java:155)
Cheers
Aled
Michael Horwitz wrote:
Hmm. In that case you might want to take a look at Spring's form tags
to make life a little easier:
http://static.springframework.org/spring/docs/2.0.x/reference/spring-form.tld.html
<http://static.springframework.org/spring/docs/2.0.x/reference/spring-form.tld.html>
So your JSP would look something like:
<spring:form commandName="website" ...>
...
<spring:select path="contact.country" items="${countries}"
itemLabel="name" itemValue="id"/>
....
</spring:form>
A lot simpler and Spring will do all the hard work for you. As long
as your form backing object has a non-null contact attribute, it
should all work like magic. I think the problem in your code is the
name you attach to the select element - Spring expects specific names
to get its bindings sorted out.
Mike.
On 7/6/07, *Aled Rhys Jones* <[EMAIL PROTECTED]
<mailto:[EMAIL PROTECTED]>> wrote:
m4, wanted to finish off some functionality before updating to m5.
Cheers
Aled
------------------------------------------------------------------------
*From:* Michael Horwitz [mailto:[EMAIL PROTECTED]
<mailto:[EMAIL PROTECTED]>]
*Sent:* 06 July 2007 08:39
*To:* [email protected] <mailto:[email protected]>
*Subject:* Re: [appfuse-user] Drop down list population
Which version of AppFuse are you using Aled?
On 7/5/07, *Tsung* < [EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>>
wrote:
Aled - Rather than having setCountryManager method, pass the
CountryManager
referene in CountryEditor's constructor.
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