Re: dynamic columns with different UI components

[Mathias Brökelmann <mb...@googlemail.com>]

Hi,

its better to post such messages to the user list.

You should use a complex object for your columns. This allows you to
use boolean is* methods to determine which type of column should be
rendered. That is much easier than binding t:columns into a backing
bean to create depended components.

2006/1/30, Michael Heinen <mh...@recommind.com>:
>
>
>
> Hi,
>
>
>
> I am new to JSF and I need some help:
>
>
>
> I use a datatable with a dynamic number of columns.
>
> This is generally working well like in the openDataTable.jsp sample.
>
>
>
> Now I have to render the first column as a checkbox (
> <h:selectBooleanCheckbox> ).
>
> In the openDataTable.jsp sample a flag is used to check whether a column
> should be rendered as <h:inputText> or <h:outputText>.
>
>
>
> Should I use also a flag to determine the UIComponent to use?
>
> This sounds really strange and complex if I have to support various
> components in the list.
>
> What is the best way to render different UIComponents for each column in
> this case?
>
> Is it possible to add the components in the backing bean and process them
> within <t:columns> ?
>
>
>
>
>
> My code snippets:
>
> <t:dataTable id="items" value="#{AnnoControllerBean.documents}"
> var="document">
>
>         <t:columns id="columns"
> value="#{AnnoControllerBean.columnHeaders}"
> var="columnHeader" >
>
>            <h:outputText value="#{AnnoControllerBean.columnValue}" />
>
>         </t:columns>
>
> </t:dataTable>
>
>
>
>
>
> class MyController {
>
>     private DataModel documentModel;
>
>     private DataModel columnHeaders;
>
>
>
>    public AnnotationController() {
>
>             List<String> headerList = new ArrayList<String> ();
>
>
>
>         headerList.add("Selected");
>
>         headerList.add("No");
>
>         headerList.add("Title");
>
>         headerList.add("Name");
>
>         columnHeaders = new ListDataModel(headerList);
>
>
>
>         List rowList = new ArrayList();
>
>
>
>         List documents = delegate.getDocuments();
>
>         Iterator iter= documents.iterator();
>
>
>
>         while(iter.hasNext() ) {
>
>             Document document = (Document) iter.next();
>
>             List colList = new ArrayList();
>
>
>
>             colList.add(document.getSelected());
>
>             colList.add(document.getDocumentId());
>
>             colList.add(document.getDatafield().get(("title")));
>
>             colList.add(document.getDatafield().get(("name")));
>
>             rowList.add(colList);
>
>         }
>
>
>
>         documentModel = new ListDataModel(rowList);
>
>     }
>
>
>
>     public DataModel getDocuments() {
>
>         return documentModel;
>
>     }
>
>
>
>     public DataModel getColumnHeaders(){
>
>         return columnHeaders;
>
>     }
>
>
>
>     public Object getColumnValue(){
>
>         Object columnValue = null;
>
>         if(documentModel.isRowAvailable() && columnHeaders.isRowAvailable())
> {
>
>             List list = (List)documentModel.getRowData();
>
>             columnValue = list.get(columnHeaders.getRowIndex());
>
>         }
>
>         return columnValue;
>
>     }
>
>     ...
>
>
>
> Thanks for any help.


--
Mathias