Hi Andrea,
I used it once and I also needed some time to figure it out :D
Here's some code, which shows t:columns in action:
The View:
<t:dataTable var="row" value="#{pageBean.dataModel}">
<t:columns value="#{pageBean.dataModel.columns}" var="column">
<f:facet name="header">
<h:outputText value="#{column.headertext}" />
</f:facet>
<f:facet name="footer">
<h:outputText value="#{column.footertext}" />
</f:facet>
<t:outputText value="#{column.value}" />
</t:columns>
</t:dataTable>
The DataModel:
public class NotenErfassenDataModel extends DataModel implements
Serializable{
private Map<Gegenstand,List<GueltigeNoten>> gegenstaende;
private List<NotenErfassenStandardRow> rows;
private List<NotenErfassenColumn> columns;
private int rowIndex;
public NotenErfassenDataModel(Map<Gegenstand,List<GueltigeNoten>>
gegenstaende,List<NotenErfassenStandardRow> rows){
this.rowIndex = -1;
this.gegenstaende = gegenstaende;
this.rows = rows;
this.columns = new ArrayList<NotenErfassenColumn>();
for(Gegenstand geg : this.gegenstaende.keySet()){
this.columns.add(new NotenErfassenColumn(geg,this));
}
}
public List<NotenErfassenColumn> getColumns(){
return this.columns;
}
public List<NotenErfassenStandardRow> getRows() {
return this.rows;
}
public String getValue(){
// get the current row object from the DataModel and get the value
for this column (via this.gegenstand) from the row object
return
((NotenErfassenStandardRow)this.model.getRowData()).getColumnValue(this.gegenstand);
}
// removed for clarity
}
The column implementation:
public class NotenErfassenColumn implements Serializable{
private Gegenstand gegenstand;
private NotenErfassenDataModel model;
public NotenErfassenColumn(Gegenstand gegenstand, NotenErfassenDataModel
model) {
super();
this.gegenstand = gegenstand;
this.model = model;
}
// cut for clarity
}
So to sum this up a bit, I have a DataModel implementation that consists of
row objects and column objects. The row objects contain the data for all
rows. The column objects are used to identify the different columns (in my
example via the class Gegenstand as a "column identifier") and they also
hold a reference back to the DataModel. So if I want to get the value for a
specific column in a specific row I use the reference to the DataModel in
the column object to get the current row object and then I use my "column
identifier" Gegenstand to get the value for the column from the row object.
I hope this helps to understand how t:columns works.
Regards,
Jakob
2010/2/28 Andrea Paternesi <[email protected]>
>
> Hi all,
>
> is there someone who can share with me the backbean code to use the
> tomahawk <t:columns> tag?
> when we have variable columns to display?
> We can assume the columns are read into an arraylist or from database as
> well.
> I found the crossDataTable example but it is not clear enought a more is is
> not complete and does not compile.
> i would like to have a very basic and simpe example.
> Thanks in advance.
>
> Andrea.
>
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