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Subject: Re: Spark Datagrid backend sorting possible ?
Date: Mon, 29 Apr 2013 15:46:27 +0200
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Or maybe overriding Datagrid->sortByColumns, not calling super and simply 
returning false/true depending if you want them considered as sorted or not;

-Fred

-----Message d'origine----- 
From: Evyatar Ben Halevi-Arbib
Sent: Monday, April 29, 2013 3:29 PM
To: users@flex.apache.org
Subject: Re: Re: Spark Datagrid backend sorting possible ?

It sounds like you just need to catch the column header mouse down event,
prevent default and execute your server calling code...

Good luck,
Evyatar
On Apr 29, 2013 4:03 PM, "Adnan Doric" <astronaute@gmail.com> wrote:

> Hey, thank you for trying to help.
> In fact, I don't want to implement lazy loading, it is a lot simpler then
> that: I just want the DataGrid to avoid sorting all together and let me
> populate "manually" the dataProvider.
>
> Please take a look at the following Gist, it is a small example
> illustrating the issue:
> https://gist.github.com/**adnandoric/5481416<https://gist.github.com/adnandoric/5481416>
>
> As you will see, the moment you click on the column header, DataGrid
> immediately sort it even though I explicitly set the sortCompareFunction
> that returns null. I'm probably doing it wrong.
>
> What I would like is to have DataGrid not sorting or doing anything at all
> when I click on the header and let me handle the whole operation. At the
> end, when data arrives from the backend, I would just need to adjust the
> sortIndicator which is apparently possible using sortDescending, thank you
> for that information :)
>
> So, what do you think about this ? Feel free to fork the gist :)
>
> Thank you,
> Adnan
>
>
> On 29/04/2013 13:13, Julio Carneiro wrote:
>
>> Yes, James Ward PagedList is the way to go if you want lazyloading.
>>
>> Also, if you're sorting in the backend there is no reason to set a Sort
>> again in your dataProvider.
>> You can simply set the sort indicators by using something like:
>>                    columnHeaderGroup.**visibleSortIndicatorIndices = new
>> <int>[_sortColumn];
>>
>> Please not that visibleSortIndicatorIndices is a Vector, so if you are
>> sorting on multiple columns, you can set them all in the Vector.
>>
>> As for the asc/desc indicators, you set them in the GridColumn
>> 'sortDescending' property.
>>
>> hth
>> julio
>>
>> On Apr 29, 2013, at 7:41 AM, Tom Chiverton <tc@extravision.com> wrote:
>>
>>  On 29/04/2013 10:56, Adnan Doric wrote:
>>>
>>>> Hello all,
>>>>
>>>> I would like to be able to click on Datagrid headers and trigger
>>>> backend call in order to paginate/sort/filter and send back an updated
>>>> collection. Datagrid should just display it as is.
>>>>
>>>> How can this be done with data grid sort indicators correctly
>>>> reflecting the state "ASC" or "DESC"?
>>>>
>>> It's easier than you think.
>>> If you are already backing this with a server result, drop in James
>>> Ward's awesome PagedList connector to an AsyncListView as the 
>>> dataprovider
>>> : 
>>> http://www.jamesward.com/2010/**10/11/data-paging-in-flex-4/<http://www.jamesward.com/2010/10/11/data-paging-in-flex-4/>
>>>
>>> Now just send the sort direction along with the call to the backend. You
>>> can get this by listening for gridClick events with (event.rowIndex ==
>>> -1)&&(event.columnIndex!=-1) and saving off the column name.
>>>
>>> Applying a matching Sort to the local dataProvider and it'll show the
>>> right indicators.
>>>
>>> Tom
>>>
>> --
>> Julio Carneiro
>>
>>
>>
>>
>