Alright! I've made progress. :)
I must have started with a cobbled-up version of the improvements Rick
Reumann made to the Display Tags, because (in the archives) he made it
sounds so easy! Thank you, Rick, for giving me something to start with
anyway. This is how I got it to work for me:
My jsp now looks like ...
display:table name=myForm property=myObjectArrayToDisplay
columnsToDisplay=columns scope=request
where columns is a field of type String[] on myForm, with getters and
setters, and populated in my action prior to displaying the jsp.
I changed the lookup() parameters in the TableTag to ...
public int doStartTag() throws JspException {
Object obj = null;
if (this.columnsToDisplay != null) {
obj = (String[]) lookup(this.pageContext,
this.name,
this.columnsToDisplay, this.scope, false);
}
if (obj != null) {
this.columnsDisplayArray = (String[]) obj;
}
HttpServletRequest req = (HttpServletRequest)this.pageContext.getRequest();
this.loadDefaultProperties();
snip
}
All *seems to be* working, and just in time for the weekend.
Hope this might help someone else.
Susan Bradeen
On 03/28/2003 02:31:53 PM Susan Bradeen wrote:
I have been using the Display tag for quite a while, but now I am trying
to implement the dynamic columns feature, meaning passing an array of
column names so the display:table shows only those columns. Does
anyone
else have this working?
The Display TableTag is using the
org.apache.taglibs.display.TableTag.lookup() method, which keeps
throwing
a null pointer exception. Using System.out statements, I know that the
lookup() is not getting nulls for pageContext, columnsToDisplay,
property,
and scope. And putting the lookup() in a try/catch block picks up the
thrown exception. Although I am passing values/objects to lookup(), I am
wondering if I am passing the *right* values/objects? I think (hope) it
will work, if I can just get past this.
My jsp contains (in part) ...
bean:define id=columnArray
bean:write name=myForm property=columns/
/bean:define
display:table name=myForm property=myObjectArrayToDisplay
columnsToDisplay=%= columnArray % scope=request
The TableTag source code contains the following (in part) ...
public int doStartTag() throws JspException {
Object obj = null;
if (this.columnsToDisplay != null) {
obj = (String[]) lookup(this.pageContext,
this.columnsToDisplay,
this.property, this.scope, false);
}
if (obj != null) {
this.columnsDisplayArray = (String[]) obj;
}
HttpServletRequest req =
(HttpServletRequest)this.pageContext.getRequest();
this.loadDefaultProperties();
snip
}
Can anyone shed some light on this?
Susan Bradeen
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