How to obtain the row data in the component datatable?

Question

if I want to edit a row data, and then know which row is edited in the component datatable, and how to do?
How to obtain the row data in the component datatable, and update it to database, not simplely edit a simple table
Any ideas? Thanks

Answer 1

Thank you very much for your help Alexander !
It's quite confusing when you leave Struts and try to adapt your projects for JSF for the first time...
I wanted to click on a row with a "onMouseClick" on the TR tag like I used to do in Struts/JSTL. But it seems to be impossible in a dataTable.
Ok then. I've added a column at the end of the row with an icon.
But eventually I didn't need to declare link parameters.
In my BackingBean I did like this :
public String selectEventForUpdate() throws IllegalAccessException, InvocationTargetException {
        PortletAgenda event = (PortletAgenda) JSFUtils.getInRequestMap("event");
        BeanUtils.copyProperties(this, event);
        return null;
   }JSFUtils.getInRequestMap(...) is a method I wrote in a util object :
public static Object getInRequestMap(String name) {
        Object res = null;
        Map requestMap=FacesContext.getCurrentInstance().getExternalContext().getRequestMap();
        if (requestMap!=null) {
            res=requestMap.get(name);
        return res;
}  " event " is the name of the item in my dataTable list.
My backingBean has the same attributes as "event".
So when the page is reloaded I have a backingBean full with the selected properties to edit/update.
Thanks to your reply I realized that putting this form in the middle of the dataTable seems to be impossible.
So I put this form in a floating DIV in front of the table with a shadow.
It works :o) !
But I'm a little bit disapointed to be honest...
I used to build my web applications with Struts and JSTL and doing this kind of interface was really easy.
I've decided 3 days ago to convert into JSF because the "GUI Layer" seemed to be improved.
But now I realize that I cannot put a onMouseOver and onMouseClick on a row and I cannot display a different row in the middle of a table....
I think it's a shame because there is a facet for header and footer.
And it would be great if we could create our own personal facet that appears only if a condition is true.
For exemple " if the current item id is the same as the request parameter id then display the following facet content ....... (with a panel group and a form inside to update the row) "
It's easy to do that with JSTL thanks to c:forEach and c:if but it seems to be impossible to use JSTL tags like this during the dataTable iteration.
And JSF tags seems to have no logical tags like " if " or loops that can be nested in dataTable.
I really need to realize this interface (you click on a row then an edit form appears where you clicked).
Do I have to write a component myself that extends dataTable?
Do you know if writing such a component is hard to do for a beginner like me?
(I've juste discovered JSF 3 days ago and I've used Struts/JSTL for 2 years til now)
I'd be glad to have much advices from you about that.
Regards