I didn't know this. When I tried it, it didn't update the dataprovider. Is there anything special that needs to happen.
--- In [email protected], "Tracy Spratt" <tr...@...> wrote: > > Data binding in general is not two-way, but an editable datagrid is a > special case. It will update the dataProvider items automatically. > > > > Tracy Spratt, > > Lariat Services, development services available > > _____ > > From: [email protected] [mailto:[email protected]] On > Behalf Of valdhor > Sent: Friday, June 12, 2009 9:42 AM > To: [email protected] > Subject: [flexcoders] Re: ArrayCollection and Datagrid Binding and > DataProvider Question > > > > > > > > > Basically, no. The datagrid is like a window into your dataprovider. > > If you need to modify your dataprovider you need to listem for the > itemEditEnd event, grab the data that was modified and update the underlying > dataprovider. > > The data binding will note that the dataprovider has changed and will update > the datagrid on the next redraw. > > What data binding does is add an event dispatcher to the variable you have > defined as bindable. When the variable changes an event is generated to let > any component that is bound to that variable know that the variable has > changed and update itself with the new data. > > Now, As I understand it (And I could be wrong) Flex 4 (Gumbo) does do full > two way data binding. I have not read up on what or how it does this but it > sounds interesting. > > HTH > > Steve > > --- In flexcod...@yahoogro <mailto:flexcoders%40yahoogroups.com> ups.com, > Angelo Anolin <angelo_anolin@> wrote: > > > > Good day. > > > > Learning Flex here for the past two (like three actually) weeks. Using > only mxml compiler. > > > > I have a question with regards to the above subject: > > > > Assuming I declared an ArrayCollection as follows: > > > > [Bindable] private var _arrItems:ArrayCollection = new > ArrayCollection([{"itemNo":"1", "testItem":"Angelo"}, {"itemNo":"2", > "testItem":"Dinah"}]); > > > > This array I am binding to a datagrid as follows: > > > > <mx:DataGrid id="dgOutwardList" > > dataProvider="{_arrItems}" > > useRollOver="false" > > height="450" > > width="100%" > > verticalScrollPolicy="auto" > > sortableColumns="false" > > draggableColumns="false" > > resizableColumns="false"> > > <mx:columns> > > <mx:DataGridColumn headerText="" dataField="itemNo" width="20"/> > > <mx:DataGridColumn headerText="Name of Passengers" dataField="testItem" > width="200"> > > <mx:itemRenderer> > > <mx:Component> > > <mx:TextInput width="100%" /> > > </mx:Component> > > </mx:itemRenderer> > > </mx:DataGridColumn> > > > > </mx:columns> > > </mx:DataGrid> > > > > No problem initially, as the itemNo and the testItem values are displayed > properly on the datagrid. > > > > Now for example, if I modified my first row which contains itemNo:1 and > testItem:Angelo, where I changed Angelo to Mickey, will the dataprovider > reflect the change in the said row? > > How do I make so that the changes in the datagrid be reflected into the > ArrayCollection? such that when I changed the testItem data for the first > row and access the item, via: > > > > _arrItems.getItemAt(arrLength -1).itemNo > > _arrItems.getItemAt(arrLength -1).testItem > > > > The result would be "1" and "Mickey" respectively? > > > > I am a bit puzzled on how databinding actually works in Flex. Is it like a > two-way live update (such that when you modify the value in the datagrid, it > is reflected back to the arraycollection)? > > > > Would love to hear your inputs. > > > > Thanks and regards, > > Angelo > > >
