How to send variables from on SWF flex file to another SWF file Using Flex.

How to Communicate From one SWF Flex file to another SWF Flex File ?

See the below example, This is loading external swf flex file into parent SWF File and sharing the data or variable from parent to child and child to parent.

Parent.mxml


CODE:

1:  <?xml version="1.0" encoding="utf-8"?>
2:  <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" width="100%" height="100%">
3:       <mx:Script>
4:            <![CDATA[
5:                 import mx.events.CloseEvent;
6:                 import mx.controls.SWFLoader;
7:                 import mx.managers.PopUpManager;
8:                 import mx.containers.TitleWindow;
9:                 import mx.controls.Alert;
10:                
11:                 public var tw:SWFPlaceHolder;
12:                
13:                 public function launchExternalSWF(title:String,swfFilePath:String):void{
14:                     
15:                      // setting a variable for child SWF File
16:                      Application.application.parameters.childVar=txt.text;
17:                     
18:                      tw = PopUpManager.createPopUp(this,SWFPlaceHolder,true) as SWFPlaceHolder;
19:                      tw.title = title;
20:                      tw.width=600;
21:                      tw.height=400;
22:                      tw.launchSWF(swfFilePath);
23:                 }
24:                
25:                 public function getValueFromChildSWF():void{
26:                      // geting value from child SWF File
27:                      Alert.show(Application.application.parameters.parentVar,"Parent App");
28:                 }
29:            ]]>
30:       </mx:Script>
31:       <mx:VBox width="100%" height="100%" paddingTop="10" paddingLeft="10" paddingRight="10" paddingBottom="10">
32:            <mx:HBox width="100%" horizontalAlign="center" verticalAlign="middle">
33:                 <mx:Label text="Set Value For Child SWF File " />
34:            </mx:HBox>
35:           
36:            <mx:HBox width="100%" horizontalAlign="center" verticalAlign="middle">
37:                 <mx:TextArea id="txt" width="100%" height="200">
38:                      <mx:text>
39:                                     Hello World for Child SWF.....
40:                      </mx:text>
41:                 </mx:TextArea>
42:            </mx:HBox>
43:            <mx:HBox width="100%" horizontalAlign="center" verticalAlign="middle">
44:                      <mx:Button label="Click to Lanuch External SWF File" id="btn" click="{this.launchExternalSWF('Launch Child SWF File','ExternalSWF.swf')}" />
45:                      <mx:Button label="Get Value From Child SWF File" id="btn1" click="{this.getValueFromChildSWF()}" />
46:            </mx:HBox>
47:       </mx:VBox>
48:  </mx:Application>
49: 

Here is another File for loading swf file SWFFilePlaceHolder.mxml


CODE:

1:  <?xml version="1.0" encoding="utf-8"?>
2:  <mx:TitleWindow xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" width="500" height="500" creationComplete="{PopUpManager.centerPopUp(this)}" showCloseButton="true" close="{PopUpManager.removePopUp(this)}">
3:       <mx:Script>
4:            <![CDATA[
5:                 import mx.events.CloseEvent;
6:                           import mx.managers.PopUpManager;
7:                           import mx.controls.Alert;
8:                           
9:                           public function launchSWF(path:String):void{
10:                                swf.source = path;
11:                                this.addEventListener(CloseEvent.CLOSE,swfUnload);
12:                                
13:                           }
14:                           
15:                           public function swfUnload(evt:Event):void{
16:                                swf.source = null;     
17:                           }
18:            ]]>
19:       </mx:Script>
20:       <mx:SWFLoader id="swf" width="100%" height="100%" />
21:  </mx:TitleWindow>
22:  

This is The Child or External SWF Flex File Child.mxml

CODE:

1:  <?xml version="1.0" encoding="utf-8"?>
2:  <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" backgroundColor="White">
3:       <mx:Script>
4:            <![CDATA[
5:                 import mx.controls.Alert;
6:                 public function getValueFromParentSWF():void{
7:                      Alert.show("Parent App Value:\n"+ Application.application.parameters.childVar,"Child SWF");
8:                      this.setValueForInternalSWF();
9:                 }
10:                 
11:                 public function setValueForInternalSWF():void{
12:                      Application.application.parameters.parentVar = txt.text;
13:                 }
14:            ]]>
15:       </mx:Script>
16:       <mx:Panel label="Child App" width="100%" height="100%">
17:       <mx:VBox width="100%" height="100%">
18:            <mx:HBox width="100%" horizontalAlign="center" verticalAlign="middle">
19:                 <mx:Label text="Set Value For Parent SWF File " />
20:            </mx:HBox>
21:            <mx:HBox width="100%" horizontalAlign="center" verticalAlign="middle">
22:            <mx:TextArea id="txt" width="100%" height="200" keyDown="setValueForInternalSWF()">
23:                      <mx:text>
24:                                     Hello World for Parent SWF.....
25:                      </mx:text>
26:                 </mx:TextArea>
27:            </mx:HBox>
28:            <mx:HBox width="100%" horizontalAlign="center" verticalAlign="middle">
29:                 <mx:Button label="Click To Get Value From Parent App Textarea" click="getValueFromParentSWF()" />
30:            </mx:HBox>
31:       </mx:VBox>
32:       
33:       </mx:Panel> 
34:  </mx:Application>
35: