Harry,
I have made a wiki page [1] on this subject. Under the current
implementation, you have to supply the glue for this yourself. (i.e. the
attribute "first" can be considered read-only)
Dev team - this question gets asked a lot. Maybe it is time to change
the behaviour of t:dataTable/t:dataScroller to be more intuitive?
[1] http://wiki.apache.org/myfaces/ManagingDataScrollerPage
Regards,
Jeff Bischoff
Kenneth L Kurz & Associates, Inc.
Harry Co wrote:
Hi all,
I wondering about something sounding odd.
It appears that binding a variable to argument "First" in UIData (ex:
HtmlDataTable) does not cause the binding method to be called when value
changes.
*More explicitly:*
I have a dataTable like this (I've removed other not releavant arguments):
*<t:dataTable first="#{myDataListBean.myBeanListStart}">*
*MyDataBean* is a managed bean scoped "session" and holds an integer
attribute called "myBeanListStart".
When I try to change the value of "myBeanListStart" by some dataScrolling
(<t:dataScroll>), HtmlDataScroller.broadcast(...) is called and calls in
turn getUIData().setFirst(...).
But surprise, the implementation of UIData modifies its own "first"
argument
and not MyDataListBean.myBeanListStart even if a proper setMyBeanListStart
exists on MyDataListBean.
Here's the code of UIData (myFacaes 1.1.3):
public void setFirst(int first)
{
if (first < 0) {
throw new IllegalArgumentException("Illegal value for first
row: " + first);
}
_first = new Integer(first);
}
public int getFirst()
{
if (_first != null)
return _first.intValue();
ValueBinding vb = getValueBinding("first");
Number v = vb != null ? (Number) vb.getValue(getFacesContext()) :
null;
return v != null ? v.intValue() : DEFAULT_FIRST;
}
Does someone knows why UIData acts like that? Is there anyway to get
myBeanListStart modified this way?
TIA.
Harry.
