CODEWITHSUNDEEP
actionscript-3flex4
Anupam Gupta
Anupam Gupta

Reputation: 1687

learning flex 4 facing problem with namespaces

I am trying to learn flex4 from adobe document and I am very confused while using three namespaces.. there is no way i can keep track of when to use what often ending up using fx inside mx or s or similarly making some stupid goofed up combinations of {fx,mx,s}.

Adobe document is huge and i am looking for some good starting point for learning flex .

Upvotes: 0

Views: 139

Answers (2)

Jason Sturges
Jason Sturges

Reputation: 15955

Your question is quite large; however, some basic explanation about the 3 namespaces you've cited:

<fx> tags are typically programmatic functionality and not visual display objects. You'd use it for declaring a script block in a MXML document or defining variables in a declarative way.

    <fx:Script>
        <![CDATA[
            [Bindable]
            public var myVariable:String = "Hello, World!";
        ]]>
    </fx:Script>

    <fx:Declarations>
        <fx:Object id="variableName"
                   property1="myCustomProperty"
                   property2="anotherCustomProperty" />
    </fx:Declarations>

When declaring visual elements and UIComponents on the display list, you'll typically want Spark architecture; therefore, you'd use the Spark namespace.

<s:Group />

MX architecture is important, but is generally deprecated by Spark. If a component is available as Spark, you should use that implementation.

<mx:Box />

All are just packages of the framework, and really no difference than importing packages in ActionScript. Your custom components will use their package name as a namespace, or you declare a namespace for your Flex MXML library.

If you're using an IDE like Flash Builder, you usually don't have to worry about the namespaces.

In an MXML file, enter the start tag (ie: <), skip the namespace and start typing the class you're after. In the above examples, I'd hit <s for "script" and the intellisense will show you completion options that will insert the namespace for you.

If the auto completion options do not appear, hit [ctrl]+[space-bar].

Let Flash Builder help with namespaces by completing them for you.

Probably doesn't go far to helping you out, but hopefully this helps a little.

Upvotes: 2

Kumsal Obuz
Kumsal Obuz

Reputation: 825

Have you tried http://www.adobe.com/devnet/flex.html especially Getting Started part?

Upvotes: 1

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