In Flex application feature sometimes works and sometimes does not...

Hello

Please help me on this...

In my flex application features works sometimes and doesn't work sometimes does not...

In my project, I have 5 sections with 5 separate screens... Each screen is a module of different.

After logining in the application:

I'll go to a screen... First time each feature works in this form...

Ex: I have a screen with datagrid. This user select name from a datagrid job click on the next button...

According to the name of the selected user work, I display information on the next screen and customer names.customer whose name is a drop-down list box.

Here is the code:

public void populateAllOEMCustomers(event:ResultEvent):void
{

1) var object_CustomerList:CustomerList = event.result as CustomerList; the values of the object //Assigining the object reference variable result.

(2) var allOEMCustomersCollection:ArrayCollection = new ArrayCollection(); Variable declaration ArrayColliction referance.

(3) var i: int = 0;
(4) var customerComboLabel:Label = new Sun;

(5) for (i = 0; i < object_CustomerList.arryCollCustName.length; i ++)
{
var strCustName:String = object_CustomerList.arryCollCustName.getItemAt (i) m:System.NET.SocketAddress.ToString ();
var strCustId:String = object_CustomerList.arryCollCustId.getItemAt (i) m:System.NET.SocketAddress.ToString ();

customerComboLabel = new Sun; Dynamic Declaration of the label.

customerComboLabel.name = strCustName; Assinging the customer name in the label name box.
customerComboLabel.text = strCustId; Assingning the customer id in the text box on the Label.

allOEMCustomersCollection.addItem (customerComboLabel); Addition of Lable in the referace ArrayCollection variable collection.
}
customerComboID.selectedItem = ' - ';.
OEMCustomersComboID.dataProvider = allOEMCustomersCollection;
OEMCustomersComboID.selectedItem = - 1;

}

This feature works very well when I visit the first time on the screen... If you go back to another screen and return to the same screen and click the button following this names combo box customer time has no customer Details... I get Nullpointer Exception and it shows the number of the line 5 (I gave the above code number..)

If I change the first line of the code to the following: each time the feature above works fine. Not getting no not an error msg...

var object_CustomerList:Object = event.result;

If I type cast in specific class (CustomerList), the feature does not work... do null pointer exception... If I type cast to object everything works fine... In my code each time I'm typecasted for the features of the specific class is not working (gettingNullpointerExcepion).

Please help me on this... I don't get what could be the reason...

I am using::Flex 3, Flash player 10.1

Thanks in advance...

Kind regards

Satya

Hi Satya,

This sometimes as in your case may not work the way you have specified the RemoteClass attribute in your AS class. Because sometimes there may be a case because before it is mapped to a server-side, you are returned to the data and so that you can not get your custom class data but as normal object type.

So to avoid this, you can map the class server-side for as classes in the Manager PreInitialize itself as shown below:

Specify the preinitializeHandler in your main application and write the function below. That way, too, you can map as classes on the side server. So you will have no problem referring to your application AS class types.

You can use the same line for recording of all classes. Using this, you can remove all of the [RemoteClass] attributes on all CLASSES and attach it to the unique place.

preinitialize = "onPreinitialize ()" "

private function onPreinitialize (): void
{
registerClassAlias ("com.expeditor.ScriptAdmin.Objects.CustomerList", list of clients);
}

In the line above the quoted string code refer to the namespace of the class on the server side and the second is your AS class. Also, remember to import the namespace from the correspondent as a class in the file.

Try this and let me know...

Thank you

Jean Claude

Tags: Flex

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