Flex DataGrid column sorting has no effect - apache-flex

Question

I want to sort these associations in a alphabetic order.
Label Function is below from where the column is getting values.
private function setColumnLabel(item:Object, col:*):String
{
if(AssociationModel(item).service != null)
return
AssociationModel(item).service.serviceName
+"["+AssociationMoel(item).service.siServiceId+"]";
else
return "";
}
<mx:DataGrid id="subLinearAssocGridInView"
width="600"
top="30"
left="12"
editable="false"
maxHeight="500"
rowHeight="20"
headerHeight="20">
<mx:columns>
<mx:DataGridColumn [Si_Service_Id]"
headerText="Service
editable="false"
dataField="service"
labelFunction="setColumnLabel"
sortable="true"/>
</mx:columns>
</mx:DataGrid>
Here i have tried with sortabledecsending=true and sortabledecsending=true but it has no effect
<mx:DataGridColumn
headerText="Service [Si_Service_Id]"
editable="false"
dataField="service"
labelFunction="setServiceColumnLabel"
sortabledecsending=true
sortable="true"/>
And also i have tried using sortCompareFunction.
public function doSortForField(field:String):Function
{
return function(obj1:Object, obj2:Object):int
{
return mx.utils.ObjectUtil.stringCompare(obj1[field],obj2[field],true);
}
<mx:DataGrid>
<mx:columns>
<mx:DataGridColumn
sortCompareFunction=”doSortForField(‘service’)”
headerText=”service” dataField=”service” />
</mx:columns>
</mx:DataGrid>
But this has also no effect.
please suggest where i am missing . Thanks in advance.

Answer 1

You were almost right, just one thing you've missed to add:
public function doSortForField(field:String, property:String):Function
{
return function (obj1:Object, obj2:Object):int
{
return mx.utils.ObjectUtil.stringCompare(obj1[field][property], obj2[field][property], true);
}
}
But still it won't be sorted by default - you'll have to click on column header to sort it dec/acc. See resulted code below:
<?xml version="1.0"?>
<mx:Application xmlns:fx="http://ns.adobe.com/mxml/2009"
xmlns:mx="library://ns.adobe.com/flex/mx"
creationComplete="creationCompleteHandler(event)">
<mx:DataGrid id="subLinearAssocGridInView"
width="600"
top="30"
left="12"
editable="false"
maxHeight="500"
rowHeight="20"
headerHeight="20"
sortableColumns="true"
>
<mx:columns>
<mx:DataGridColumn
headerText="Service"
editable="false"
dataField="service"
labelFunction="setColumnLabel"
sortCompareFunction="doSortForField('service', 'serviceName')"
/>
</mx:columns>
</mx:DataGrid>
<fx:Script><![CDATA[
import mx.collections.ArrayCollection;
import mx.events.FlexEvent;
import mx.utils.ObjectUtil;
private function creationCompleteHandler(event:FlexEvent):void
{
const mockData:ArrayCollection = new ArrayCollection([
{service: {serviceName: "service1", siServiceId: "serviceId1"}},
{service: {serviceName: "service2", siServiceId: "serviceId2"}},
{service: {serviceName: "service3", siServiceId: "serviceId3"}},
{service: {serviceName: "service4", siServiceId: "serviceId4"}}
]);
subLinearAssocGridInView.dataProvider = mockData;
}
private function setColumnLabel(item:Object, col:*):String
{
if (item.service != null)
{
return item.service.serviceName + "[" + item.service.siServiceId + "]";
}
else
{
return "";
}
}
public function doSortForField(field:String, property:String):Function
{
return function (obj1:Object, obj2:Object):int
{
return mx.utils.ObjectUtil.stringCompare(obj1[field][property], obj2[field][property], true);
}
}
]]></fx:Script>
In case you want to apply default sorting:
private function subLinearAssocGridInView_creationCompleteHandler(event:FlexEvent):void
{
mockData.sort = new Sort();
mockData.sort.fields = [
new SortField('serviceName', true, true, false, null, doSortForField('service', 'serviceName'))
];
mockData.refresh();
}
So the resulted code will be:
<?xml version="1.0"?>
<mx:Application xmlns:fx="http://ns.adobe.com/mxml/2009"
xmlns:mx="library://ns.adobe.com/flex/mx">
<mx:DataGrid id="subLinearAssocGridInView"
dataProvider="{mockData}"
width="600"
top="30"
left="12"
editable="false"
maxHeight="500"
rowHeight="20"
headerHeight="20"
creationComplete="subLinearAssocGridInView_creationCompleteHandler(event)"
>
<mx:columns>
<mx:DataGridColumn
headerText="Service"
editable="false"
labelFunction="setColumnLabel"
sortCompareFunction="doSortForField()"
/>
</mx:columns>
</mx:DataGrid>
<fx:Script><![CDATA[
import mx.collections.ArrayCollection;
import mx.collections.Sort;
import mx.collections.SortField;
import mx.events.FlexEvent;
import mx.utils.ObjectUtil;
private static const SERVICE_FIELD:String = 'service';
private static const SERVICE_NAME_PROPERTY:String = 'serviceName';
[Bindable]
public var mockData:ArrayCollection = new ArrayCollection([
{service: {serviceName: "service1", siServiceId: "serviceId1"}},
{service: {serviceName: "service2", siServiceId: "serviceId2"}},
{service: {serviceName: "service3", siServiceId: "serviceId3"}},
{service: {serviceName: "service4", siServiceId: "serviceId4"}}
]);
private function setColumnLabel(item:Object, col:*):String
{
if (item.service != null)
{
return item.service.serviceName + "[" + item.service.siServiceId + "]";
}
else
{
return "";
}
}
public function doSortForField(field:String = SERVICE_FIELD, property:String = SERVICE_NAME_PROPERTY):Function
{
return function (obj1:Object, obj2:Object):int
{
return mx.utils.ObjectUtil.stringCompare(obj1[field][property], obj2[field][property], true);
}
}
private function subLinearAssocGridInView_creationCompleteHandler(event:FlexEvent):void
{
mockData.sort = new Sort();
mockData.sort.fields = [
new SortField(SERVICE_NAME_PROPERTY, true, true, false, null, doSortForField())
];
mockData.refresh();
}
]]></fx:Script>

Answer 2

Have you tried sorting the dataProvider content instead? If you are using Array then use Array.sort(). If you are using ArrayCollection then use its sort field