Question

keeping the order of columns in flex datagrid

Asked by: SimonHowald

keeping the order of columns in flex datagrid:
I have a problem where I see the flex datagrid changes the order of columns rendered in browser. I hope adobe orders column names in alphabetical order but doesn't keep the same order as defined in the dataprovider xml.

Is there any way to keep the same order as in the dataprovider?


Thanks in advance!

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Asked On
2009-02-05 at 14:45:55ID24117683
Tags

flex

,

datagrid

Topics

Stores & Carts

,

Adobe Flex

,

ActionScript

Participating Experts
2
Points
125
Comments
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Answers

 

by: Jones911Posted on 2009-02-05 at 15:00:06ID: 23565311

Can you show some sample code?

 

by: SimonHowaldPosted on 2009-02-05 at 15:08:52ID: 23565374

flex code:
<mx:DataGrid id="dg" dataProvider="{baselineDataProvider}" width="100%" height="100%"
       creationComplete="clearInputs()"  wordWrap="true">    
</mx:DataGrid>

xml files used for dataprovider:
<items>
  <item id="9614" type="FE" model="IACH" modelid="IACH FRD" segment="3" segment_group="1" score_from="34.728" score_to="115.009" total_transaction_percent="5.01" acceptable_threshold_deviation="10" />
  <item id="9615" type="FE" model="IACH" modelid="IACH FRD" segment="3" segment_group="2" score_from="115.025" score_to="127.828" total_transaction_percent="5.03" acceptable_threshold_deviation="10" />


output shown on browser: attached file



 

by: SimonHowaldPosted on 2009-02-05 at 15:10:12ID: 23565382

One more thing, I don't want to use <mx:DataGridColumn as the number of columns are not knows and it all coming from dataprovider.

 

by: Jones911Posted on 2009-02-05 at 15:11:13ID: 23565389

You have to use mx:DataGridColumn if you want to order them a specific way.

 

by: SimonHowaldPosted on 2009-02-05 at 15:28:31ID: 23565492

yeah that's the alternate way...

is there other way where we can loop over the datagrid columns and order them with action script? if yes then I need script to do it...

 

by: zzynxPosted on 2009-02-05 at 23:57:52ID: 23567583

You will have to construct the DataGrid.columns property in the desired order before assigning your dataProvider.

 

by: zzynxPosted on 2009-02-06 at 00:02:16ID: 23567621

From the Flex help file about the DataGrid's "columns" property:

An array of DataGridColumn objects, one for each column that can be displayed. If not explicitly set, the DataGrid control attempts to examine the first data provider item to determine the set of properties and display those properties in alphabetic order.

If you want to change the set of columns, you must get this array, make modifications to the columns and order of columns in the array, and then assign the new array to the columns property. This is because the DataGrid control returned a new copy of the array of columns and therefore did not notice the changes.

 

by: zzynxPosted on 2009-02-06 at 00:12:50ID: 23567699

Here's an example to illustrate.
I reverse the (alphabetical) order of the columns.

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
				layout="vertical"
				verticalAlign="middle"
				backgroundColor="white">
 
	<mx:Script>
	<![CDATA[
		import mx.collections.ArrayCollection;
 
		[Bindable]private var arrayOfString:Array;
 
		[Bindable]
		public var dgArray:ArrayCollection = new ArrayCollection([
			{Price:'Lots', Store:'yahoo', Artist:'Jack'},
			{Price:'None', Store:'amazon', Artist:'Jill'}
		]);
 
		private function init():void {
			myGrid.dataProvider = dgArray;
			var array:Array = myGrid.columns;
			array.reverse();
			myGrid.columns = array;
			myGrid.validateNow();
		}
 
	]]>
	</mx:Script>
 
	<mx:DataGrid id="myGrid" initialize="init();">
	</mx:DataGrid>
 
</mx:Application>
                                              
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by: zzynxPosted on 2009-02-06 at 00:35:56ID: 23567821

And in case you wonder what objects that array contains: DataGridColumn objects.
So based on their dataField property you can identify them and sort them as you like.

E.g. If I would like to keep my Price-Store-Artist order I could write an init() method like this:

(I know it's ugly code, but it's just to demonstrate the idea)

		private function init():void {
			myGrid.dataProvider = dgArray;
			var array:Array = myGrid.columns;
			var newOrderArray:Array = new Array(3);
			for (var i:int=0; i<array.length; i ++) {
				var dgc:DataGridColumn = array[i] as DataGridColumn;
				if (dgc.dataField=="Price")
					newOrderArray[0] = dgc;
				else if (dgc.dataField=="Store")
					newOrderArray[1] = dgc;
				else if (dgc.dataField=="Artist")
					newOrderArray[2] = dgc;
			}
			myGrid.columns = newOrderArray;
			myGrid.validateNow();
		}
                                              
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by: SimonHowaldPosted on 2009-02-06 at 16:30:20ID: 31543474

Thanks so much for explaining it clearly.
I got it working...
:-)

 

by: zzynxPosted on 2009-02-08 at 10:49:51ID: 23585008

You're welcome
Thanx 4 axxepting

20120131-EE-VQP-002

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