Hi Jarin,
To use x:columns you need to have to have a second collection (contains
the index for each element of your nested arraylist) which contains the
identifier for each column. You can use this collection for the value
attribute in the x:columns component. Define a var in x:columns like the
var for each row in the datatable to determine the current column. The
next step would be to implement a getter method in a bean and take the
current row and the current column to determine which value you want to
show.
Here is an example which uses nested lists to solve your case:
The jsp code:
<x:dataTable value="#{data.rows}" var="row" >
<x:columns value="#{data.columns}" var="column">
<h:outputText value="#{data.columnValue}" />
</x:columns>
</x:dataTable>
The java code for bean data:
Public class Data
{
private List mRows;
private List mColumns;
List getRows()
{
if(mRows == null)
{
// initialize your data with the nested arraylists
mRows = initializeData();
}
return mRows;
}
List getColumns()
{
if(mColumns == null)
{
mColumns = initializeColumns();
}
return mColumns;
}
List initializeColumns()
{
// 1. determine how many columns you have
int count = 10;
// 2. create a list which contains the index for each column
List result = new ArrayList();
for(int i = 0; i < count; i++)
{
result.add(new Integer(i));
}
return result;
}
Object getColumnValue()
{
// 1. determine the current row data which is of type List in your
case
List rowData =
(List)getValueBinding("row").getValue(FacesContext.getCurrentInstance())
;
// 2. determine the current value of the column "row"
Integer currentColumnIndex =
(Integer)getValueBinding("column").getValue(FacesContext.getCurrentInsta
nce());
// 3. get the n-th element of you rowdata list
return rowData.get(currentColumnIndex);
}
}
You can try to use complex objects in the columns list to show a
meaningfull header label for each column
Mathias
> -----Original Message-----
> From: Jaroslav Rychna [mailto:[EMAIL PROTECTED]
> Sent: Sunday, May 15, 2005 1:01 PM
> To: MyFaces Discussion
> Subject: x:columns
>
>
> Hi,
> i have a table with variable number of columns. In my case it
> means that
> if user selects table1 it has 10 rows and in each row there is 20
> columns or if user select table2 it has 15 rows and in each
> row there is
> 15 columns. There can be many tables and many options, I do
> not know
> exact numbers.
>
> I want to do this by x:dataTable and x:columns. But I don't know how.
> I have ArrayList (the whole table) which consists of
> ArrayLists (rows)
> and in this second ArrayList there are columns. (It's like a matrix).
>
> I looked at example of crosstable, but I'm not sure, that I'm
> understand it.
>
> Any thougths how can I do this?
>
> thanks jarin
>
>
