Using the rich:extendedDataTable selection attribute

[firas_abah]

Dear all,

I am trying to use the rich:extendedDataTable component from richfaces 3.3.0 as follows:

<rich:extendedDataTable value="#{Employees.list}" var="employee" selectionMode="single" selection="#{Employees.selection}" width="520" height="150" >
...
</rich:extendedDataTable>

I have defined the 'selection' bean property as follows:

private org.richfaces.model.selection.SimpleSelection selection;

When the user picks a row from the datatable and click a submit button like this:

<h:commandButton value="Edit" action="#{Employees.edit}" />

the method bound need to get the selected employee object using the 'selection' property. How can this be done in the managed bean?

[nbelaevski]

Hello,

SimpleSelection contains set of row key objects corresponding to item model index. Here is the example of converting keys to model objects: http://livedemo.exadel.com/richfaces-demo/richfaces/scrollableDataTable.jsf?c=scrollableDataTable&tab=usage
http://fisheye.jboss.org/browse/RichFaces/trunk/samples/richfaces-demo/src/main/java/org/richfaces/datatablescroller/DataTableScrollerBean.java?r=11866

[firas_abah]

Thanks a lot nbelaevski,

The following does it for me:

private Employee getSelectedEmployee() {
 Iterator<Object> iterator = getSelection().getKeys();
 while (iterator.hasNext()){
 Integer key = (Integer) iterator.next();
 return (Employee) getList().get(key);
 }
 return null;
 }

Not sure if it was safe to make that Object to Integer cast for the selection key!

Anyone can describe how 'key' works?

Regards,

[nbelaevski]

Keys are created by data model in order to serve as data model items locator. When iteration component is rendered or submitted, keys are used to identify data iterator position.
You can use your own data model generating its own keys, but for the case of built-in data table models, model keys are Integer.

[firas_abah]

Dear nbelaevski,

Thanks a lot for being very helpful again.

Best Regards,
Firas