Hi! >From the Apache MyFaces Web site about the "preserveDataModel" attribute:
"When this attribute is "true", the data behind the current DataModel is saved after the render response phase and restored in the restore component tree phase. " I'm not sure if I understand the problem correctly, that caused the "preserveDataModel" attribute invention. Is it related to the possibility, that the data model might have been changed between the *last render response phase* and the following *restore view* and *apply request values* phase, when the user submits to the same view (postback)? If so, do I only have to use the "preserveDataModel" attribute if the data model might get changed between these phases, thus while the user views the page with the data table? Regards, Matthias > -----Ursprüngliche Nachricht----- > Von: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] Auftrag > von Mathias Brökelmann > Gesendet: Donnerstag, 22. Dezember 2005 11:04 > An: MyFaces Discussion > Betreff: Re: preserveDataModel (attribute of dataTable) questions > > > 2005/12/22, Matthias Kahlau <[EMAIL PROTECTED]>: > > javax.faces.el.EvaluationException: Cannot set value for expression > > '#{FragenBacking.fragenModel}' to a new value of type org.apache.myfaces > > .component.html.ext._SerializableDataModel > > you have a setter method for fragenModel which does not accept a > parameter for an instance of javax.faces.model.DataModel. > > > > Another question related to the dataModel. I don't know if the > > "preserveDataModel" approach can help, but when the user leaves the site > > with the table because the user selected an edit link in the > table, and then > > returns to the site with the table, I cannot use the > getRowData() method to > > determine the last row selected. If I do that, I get the following error > > message: > > That is not possible. You have to remember which row was selected > between the views and call datamodel.setRowIndex(rememberedIndex) > before calling getRowData(). > > -- > Mathias
