Out of curiosity, you say you are goint to make sure all access to this page calls your init message, how are you going to do that?
-----Original Message----- From: Brandon Goodin [mailto:[EMAIL PROTECTED] Sent: Thursday, April 14, 2005 2:22 AM To: MyFaces Discussion Subject: Re: dataTable and commandButton question okay i solved my own problem. I didn't realize that JSF magically retains my state even when my managed bean is in request mode. Thanks JSF/MyFaces! All i need to do is intialize my UIData value with a list from the database the first time i access it.After that i update my UIData value via the action that i call. Everytime UIData value is attempted to be set it will see that it is not null and leave it alone. So, i only hit my db once for the initial list and then after that only intentionally. This allows me to be sure that the index object will be what i am expecting it to be. I think i am going to make this even easier by making sure that all access to this page calls the #{categoryAdmin.init} action first. Then i can even do away with the faux init wrapper. ... /** * @return Returns the categoryTable. */ public UIData getCategoryTable() { return initCategoryTable(categoryTable); } /** * @param categoryTable The categoryTable to set. */ public void setCategoryTable(UIData categoryTable) { this.categoryTable = initCategoryTable(categoryTable); } private UIData initCategoryTable(UIData categoryTable) { if(categoryTable.getValue() == null) { categoryTable.setValue(catalogService.getChildCategories(category)); } return categoryTable; } ... On 4/13/05, Brandon Goodin <[EMAIL PROTECTED]> wrote: > wow, after looking at all the proposed solutions i wound up coming > back to what i was doing before. Which is exactly what Srikanth > recommended. Is there a reason why the rest of you chose such obscure > routes to the getRowData? > > Also it seems that no matter what i do the UIData property that my > dataTable is bound too on my backing bean get's called twice. Once > before the action is called and once after the action method is > called. When i select an item with the commandLink I am only > interested in the id of that element. It seems that i HAVE to load the > whole list back in just to get the id from the selected index of the > list. I prefer not to keep lists in my session scope and so my managed > bean is request scope and i load lists only as i need them. But, the > auto loading that is performed by JSF does not make this easy. Is > there a way around this? > > I currently have an init boolean for my UIData so that the list will > only load once from my service layer. I would prefer that the List not > have to be loaded when i select the commandLink. Like i said i'm only > interested in the id. Also, the odd thing about grabbing the selected > object using the getRowData (which looks up the index) is that the > list i grab from my service layer may have been updated. So, then the > index would return the wrong object. Does everyone simply load up all > their lists into their managedbeans and store them in session scope? > > It doesn't seem that developing something as simple as this should be > so difficult. > > Following is my code. > > ... > > private CatalogService catalogService = null; > > private Category category = new Category(); > > private UIData categoryTable = new UIData(); > private boolean categoryTableInit = false; > > /** > * no arg contructor > */ > public CategoryAdminPresentation() { > this.catalogService = > (CatalogService)ServiceFactory.getInstance().getService(CatalogService.class); > } > > public String child() { > > Category category = (Category)categoryTable.getRowData(); > > // create parent category template > Category parentCategory = new Category(); > parentCategory.setParentCategoryId(category.getCategoryId()); > > > categoryTable.setValue(catalogService.getChildCategories(parentCategor > y)); > > return "child"; > } > > /** > * @return Returns the categoryTable. > */ > public UIData getCategoryTable() { > return initCategoryTable(categoryTable); > } > /** > * @param categoryTable The categoryTable to set. > */ > public void setCategoryTable(UIData categoryTable) { > this.categoryTable = initCategoryTable(categoryTable); > } > > private UIData initCategoryTable(UIData categoryTable) { > > if(categoryTableInit==false) { > categoryTable.setValue(catalogService.getChildCategories(category)); > categoryTableInit = true; > } > > return categoryTable; > > } > > /** > * @return Returns the category. > */ > public Category getCategory() { > return category; > } > /** > * @param category The category to set. > */ > public void setCategory(Category category) { > this.category = category; > } > > ... > > Thanks, > Brandon > > On 4/13/05, Brandon Goodin <[EMAIL PROTECTED]> wrote: > > This rowData works okay, if you are using session... but there are > > problems with this. Most of the time you want to query based on the > > ID of your object. Not the index of the object location. If you > > database changes behind the scenes and you query a list from the > > database, the index may produce a different object. The important > > thing to me is to get the ID for the query. I don't like to keep > > lists of objects in session. That's weighty and pointless. I > > appreciate the previous contributions. I'm going to try them out later this > > evening. > > > > Please correct me if i'm wrong. > > > > Thanks, > > Brandon > > > > On 4/13/05, Srikanth Madarapu <[EMAIL PROTECTED]> wrote: > > > In your backing bean, you must have access to the model (of your table ), > > > just call yourModel.getRowData() to get the current row's data or > > > yourModel.getRowIndex to the currenty row's index. > > > > > > -----Original Message----- > > > From: Ray Clark [mailto:[EMAIL PROTECTED] > > > Sent: Wednesday, April 06, 2005 10:46 PM > > > To: [email protected] > > > Subject: dataTable and commandButton question > > > > > > I'm sure this must have been asked before but I can't find it in > > > the archives. So please forgive me if it has been asked before. > > > > > > I have a dataTable with a commandButton rendered on each row. > > > When the commandButton is pressed I need it's managed bean method > > > to know which row the button was pressed for. So how can the > > > method know which row to process? > > > > > > Thanks, > > > Ray > > > > > > __________________________________ > > > Do you Yahoo!? > > > Take Yahoo! Mail with you! Get it on your mobile phone. > > > http://mobile.yahoo.com/maildemo > > > > > >
