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flex dynamic mxml component adding

Posted on 2010-08-20
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Last Modified: 2012-05-10
Hello,

I'm attempting to add mxml components dynamically to a display list within a form and am having issues.  

The form is intended to allow users to conduct customer interviews.  After selecting the interview type from a combo box, questions are retrieved via web service (working) and then added to a question object (custom AS3 class ).
These objects are then added to an array collection.  Then I create another array collection and add my mxml question 'widget' and map it to one of the existing question objects. When I run the application and refresh the data provider of the display list (using custom item renderer), the components will display but not the mapped question object values (i.e. the question text).

How do I get the mapped question object values to display within the component?



Here is how I am building the list data provider:

                                //save web service result (XML) for local use
                        var xmlResult:XML=new XML(event.result);

                        //create array collection to hold question object values
                        var questionsAC:ArrayCollection=new ArrayCollection();

                        //loop through all questions in result
                        for each (var question:XML in xmlResult.Table)
                        {
                              //create question object
                              var tempQuestionAdt:InterviewQuestionsAdt=new InterviewQuestionsAdt;
                              
                              //load question object values from XML input
                              tempQuestionAdt.LoadFromXML(question);
                              
                              //add questions object to array collection for later use
                              questionsAC.addItem(tempQuestionAdt);
                        }
                        
                        //create array collection to hold mxml components
                        var displayQuestionsAC:ArrayCollection = new ArrayCollection();
                        
                        try
                        {
                  // loop through all questions in questions array and assign objects to mxml components
                              for (var x:int=0; x < questionsAC.length; x++)
                              {
                                    //create new mxml component
                                    var thisQuestionWidget:InterviewQuestionWidget=new interviewQuestionWidget();
      
                                    //remap array collection object to custom object class
                                               
                                               
                                    //var tempQ:InterviewQuestionsAdt=questionsAC[x] as InterviewQuestionsAdt;

                                    //define a unique 'id' value for each created mxml component
                                    thisQuestionWidget.id="wgtQuestion" + x.toString();
                                    
                                    //set current question object to mxml component value
                                    thisQuestionWidget.QuestionAdt=tempQ;
                                    
                                    //Alert.show(tempQ.question);
                                    //thisQuestion.Activate();
                                    //thisQuestion.invalidateDisplayList();
                                    
                                    //add mxml component to display list array collection
                                    displayQuestionsAC.addItem(thisQuestion);
                              }
                              
                              //reset display list data provider
                              listQuestions.dataProvider=displayQuestionsAC;
                              listQuestions.invalidateDisplayList();
                        }
                        catch (err:Error)
                        {
                              //display error
                              Alert.show(err.message);
                        }



Here is the mxml List:

<mx:List x="10" y="184" width="698" height="414" id="listQuestions"  >
                  <mx:itemRenderer>
                                                
                                          <mx:Component>
                                                <ns2:InterviewQuestionOuterWidget  >
                                                
                                                </ns2:InterviewQuestionOuterWidget>
                                          </mx:Component>

                                    </mx:itemRenderer>
                  
                  </mx:List>



Here is the mxml component in question:


<?xml version="1.0" encoding="utf-8"?>
<mx:Canvas xmlns:mx="http://www.adobe.com/2006/mxml"
		   width="524"
		   height="170"
		   cornerRadius="8"
		   borderThickness="1"
		   borderColor="#000000"
		   color="#000000"
		   borderStyle="solid"
		   backgroundColor="#B2B2B2"
		   fontFamily="futura md bt"
		   fontSize="10"
		   maxHeight="170"
		   maxWidth="524"
		   creationComplete="Activate();"	  
		   >
			   

	<mx:Script>
		<![CDATA[
			import mx.collections.ArrayCollection;
			import com.adobe.linguistics.spelling.SpellUI;
			import com.lag.adt.cosulting.interview.InterviewQuestionsAdt;
			import mx.controls.Alert;

			[Bindable]
			public var QuestionAdt:InterviewQuestionsAdt;
			
			public var cbAnswerScores:ArrayCollection = new ArrayCollection([{label:"Very Positive",score:5},{label:"Positive",score:4},{label:"Neutral",score:3},{label:"Negative",score:2},{label:"Very Negative",score:1}]);
			
			public var InitDone:Boolean = false;
			
			public function Init():void
			{
				InitDone = true;
			}
			
			public function Activate():void
			{
				Alert.show(QuestionAdt.question);
				trace("Question is:"+QuestionAdt.question);
				trace("Tip is: "+QuestionAdt.questiontips);
				txtQuestionText.text = QuestionAdt.question;
				txtQuestionText.toolTip = QuestionAdt.questiontips;
			}
			public function setQuestionText():void
			{
				 if(txtQuestionText != null)
				{ 
					Alert.show(QuestionAdt.question);
					txtQuestionText.text = this.QuestionAdt.question.toString();
					txtQuestionText.toolTip = this.QuestionAdt.questiontips.toString();
				}
			}
		]]>
	</mx:Script>


	<mx:TextInput x="10"
				  y="72"
				  width="458"
				  height="86"
				  fontFamily="futura md bt"
				  fontSize="10"
				  text="Answer Text Goes Here."
				  id="txtAnswerText"
				  creationComplete="SpellUI.enableSpelling(txtAnswerText, 'en_US');"/>
	<mx:TextInput x="10"
				  y="22"
				  width="376"
				  height="42"
				  editable="true"
				  backgroundColor="#E2DEDE" 
				  fontFamily="futura md bt"
				  fontSize="12"
				  id="txtQuestionText"
				  enabled="true" visible="true"
				  />
				  
	<mx:Button x="476"
			   y="72"
			   width="35"
			   height="86"
			   id="btnExpandAnswerText">
		<mx:downIcon>@Embed(source='../../Assets/img/up_arrow_16_x_16.gif')</mx:downIcon>
		<mx:icon>@Embed(source='../../Assets/img/down_arrow_16_x_16.gif')</mx:icon>
	</mx:Button>
	<mx:ComboBox x="394" y="24" width="118" id="cbAnswerScore" dataProvider="{cbAnswerScores}" labelField="label" selectedIndex="2" ></mx:ComboBox>
	<mx:Label x="394" y="54" id="lbQnum"/>

</mx:Canvas>

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Question by:rwhitlatch
1 Comment
 
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Accepted Solution

by:
jth_92 earned 2000 total points
ID: 33487384
Depending on the way your service is returning the xml there could be different methods.
What I would do is create a variable that is bindable in your mxml component for each property of the question that you need:

[Bindable] public var QuestionTextVar:String;
....
In the txtQuestionText TextInput Component add the property:
   text="{QuestionTextVar}" to show

<mx:TextInput x="10"
                          y="22"
                          width="376"
                          height="42"
                          editable="true"
                          backgroundColor="#E2DEDE"
                          fontFamily="futura md bt"
                          fontSize="12"
                          id="txtQuestionText"
                          enabled="true" visible="true"
                          text="{QuestionTextVar}" />                            


When you create the object from you main application:

                              //create question object
                              var tempQuestionAdt:InterviewQuestionsAdt=new InterviewQuestionsAdt;

                              /* replace this with ******************************
                              //load question object values from XML input
                              tempQuestionAdt.LoadFromXML(question);
                              ****************************************************/
                             /* with the following ***********************/
                            tempQuestionAdt.QuestionTextVar = question.lastResult.xmlQuestionTag //replace xmlQuestion Tag with the correct xml tag that returns the question

                              //add questions object to array collection for later use
                              questionsAC.addItem(tempQuestionAdt);

Thus, the mxml component should correctly load from the parent application.
For more info check out: http://livedocs.adobe.com/flex/3/html/help.html?content=layouts_12.html
where it discusses how to pass data to and from a pop-up window.
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