How to filter the data displayed in a datatable

Question

Is there a way to populate a datatable so that the data displays in a column only when it is different than the previous rows. For example if I have a List of InventoryItems that have properties State, WHouse, Widget, Count.
And I want to display them something like this:
    GA    WH1    Widg1      255
                 Widg2      566
                 Widg3      999
          WH2    Widg1      100
                 Widg4       55
    FL    WH5    Widg1      687
          WH6    Widg5      566I hope the formatting comes out correct. The GA & FL should be in the first column. WHX in the second, WidgX in the third, and the count in the fourth.
I hope someone has an idea how I can achieve this effect.
Thanks

Answer 1

Yes, binding to the rendered property the way you suggested should do the trick.
FYI, here's an example that illustrates how the <if> component in JSFTemplating works:
<foreach key="key" list={"A" "B" "C"}>
    <!if !(#{key} = B)>
        <staticText value="Not B, it's '<b>#{key}</b>'</br>" />
    </if>
</foreach>If you cut / paste that code into a file called test.jsf and run it in a JSFTemplating enabled application (follow the directions on the www site to run the demo app, drop it in that app), it will show values not equal to 'B" (A and C). FYI (#2): the <staticText> component above has a short cut syntax, so it could also be written:
<foreach key="key" list={"A" "B" "C"}>
    <!if !(#{key} = B)>
        "Not B, it's '<b>#{key}</b>'</br>
    </if>
</foreach>FYI (#3): You can use any #{} you want in the <if> condition and can form complex boolean equations.
Good luck!
Ken Paulsen
https://jsftemplating.dev.java.net