RE: [flexcoders] Datagrid Change Function

Wed, 25 Oct 2006 15:47:05 -0700

What you could do… if your myDP is an ArrayCollection or one of the collection classes you could add a listener to the change event.  That way any time the dataProvider changes (the change event on the Collection itself can let you know if an item was added, removed or updated) you can recalculate the totals.  That way your total will always be in synch with your data without having to manually recalculate the total.

 

From: [email protected] [mailto:[email protected]] On Behalf Of s_hernandez01
Sent: Wednesday, October 25, 2006 3:14 PM
To: [email protected]
Subject: [flexcoders] Datagrid Change Function

 

Hey Flexers

I created a datagrid to represent a shopping cart. Now, I'm having a
problem updating the total when the quantity is changed. Right now it
just gives the total because I have the quantity set to 1, but if the
users types in a different quantity I want it to update the total. If
anybody has any suggestions, I'd appreciate it. Below is my calculate
function and my datagrid.

Thanks
Sal

public function calculateTotal():void{
var t:Number = 0;
var n:Number = 0;
for(var i:int = 0; i < myDP.length; i++){
n += myDP[i].qty;
t += myDP[i].price * myDP[i].qty;
}
total = t;
numProducts = n;
}

<mx:DataGrid width="100%" height="250" dataProvider="{myDP}"
textAlign="center" id="cartGrid">
<mx:columns>
<mx:DataGridColumn id="qty" headerText="Qty"
rendererIsEditor="true" dataField="qty"
itemRenderer="mx.controls.TextInput" editorDataField="value" width="24"/>
<mx:DataGridColumn headerText="Price" width="35"
dataField="price" labelFunction="myLabelFunction"/>

</mx:columns>
</mx:DataGrid>

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