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Dynamic Form Creation Flex

Posted on 2008-06-20
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Last Modified: 2010-04-21
Hi Genusies,
I have XML file which have a format like
<name>robert</name>
<last name>jackson</last name>

Now I have to create a dynamic form in Flex which contains form items called name with value "robert"
lastname "jackson".
This form has to be created at runtime so that in case in future if xml xhanges so does the form.

I am still a newbie in flex :)

Thanks in advance for replying to my post.

Thanks,
dojjol


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Question by:dojjol
3 Comments
 
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bglodde earned 2000 total points
ID: 21836360
Your XML will have to increase in complexity to do this correctly. See the attached starter code/template that demonstrates how you can both generically and dynamically create form elements from XML in Flex. Please also note this is only one way to do it - I'm sure there are many others.

Hope that helps you get started.
- XML FILE (save as test/formdata.xml) - 
 
<?xml version="1.0"?>
<userinfoform>
	<user>
		<firstname inputtype="TextInput" formlabel="First Name">Robert</firstname>
		<lastname inputtype="TextInput" formlabel="Last Name">Jackson</lastname>
	</user>
</userinfoform>
 
********************************************************
 
- MXML App -
 
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" creationComplete="handleCreationComplete()">
	<mx:Script>
		<![CDATA[
			import mx.containers.FormItem;
			import mx.controls.Label;
			import mx.controls.TextInput;
			
			import mx.controls.Alert;
			import mx.rpc.events.FaultEvent;
			import mx.rpc.events.ResultEvent;
			
			private function handleCreationComplete():void
			{
				XMLService.send();		
			}
			
			private function errorHandler(evt:FaultEvent):void
			{
				Alert.show("Error: " + evt.fault.message);
			}
			
			private function resultHandler(evt:ResultEvent):void
			{
				buildForm(new XML(evt.result));
			}
			
			private function buildForm(xml:XML):void
			{
				var lst:XMLList = xml.children();
					
				for(var i:int = 0; i < lst.length(); i++)
				{
					var x:XMLList = lst[i].children();
					
					for(var j:int = 0; j < x.length(); j++)
					{
						if(x[j].@inputtype == 'TextInput')
						{
							var frmItem:FormItem = new FormItem();
							frmItem.direction = "horizontal";
							frmItem.label = x[j].@formlabel;
							
							var tb:TextInput = new TextInput();
							tb.text = x[j];
							frmItem.addChild(tb);
							
							userInfoForm.addChild(frmItem);
						}
						else
						{
							// Support other form field types
						}
					}
				}
			}
			
		]]>
	</mx:Script>
	<mx:HTTPService fault="errorHandler(event)" id="XMLService" resultFormat="e4x" url="test/formdata.xml" result="resultHandler(event)" />
	<mx:Form id="userInfoForm" />
</mx:Application>

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Author Closing Comment

by:dojjol
ID: 31469093
Thanks
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Expert Comment

by:PLouis74
ID: 27608841
This is awesome and is perfectly in line with something i was trying to accomplish!!!

i modified this to also allow for method names and dataproviders for form items like comboBox, etc.
NEW XML-------------
<?xml version="1.0"?>
<userinfoform>
        <user>
                <firstname inputtype="TextInput" formlabel="First Name">Robert</firstname>
                <lastname inputtype="TextInput" formlabel="Last Name">Jackson</lastname>
                <venueitems inputtype="ComboBox" formlabel="Venue" dataprovider="venueDataSet" methodname="comboBoxHandler"></venueitems>
                <submitbutton inputtype="Button" buttonlabel="Send Form" methodname="handleFormSubmit"></submitbutton>
        </user>
</userinfoform>


MXML----------------

<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" creationComplete="handleCreationComplete()">
        <mx:Script>
        <![CDATA[
	    	import mx.controls.ComboBox;
	    	import mx.collections.ArrayCollection;
	    	import mx.controls.Button;
	        import mx.containers.FormItem;
	        import mx.controls.Label;
	        import mx.controls.TextInput;
	        
	        import mx.controls.Alert;
	        import mx.rpc.events.FaultEvent;
	        import mx.rpc.events.ResultEvent;
	        
	        public var venueDataSet:ArrayCollection = new ArrayCollection();
	        public var labelList:Array = new Array("New York", "Orlando", "Cincinnati");
	        public var dataList:Array = new Array("NY", "OL", "CN");
	        
	        private function initDataSet():void
	        {
				for (var i:int = 0; i < dataList.length; i++){
					var newItem:Object = new Object();
					newItem.data = dataList[i];
					newItem.label = labelList[i];
					  
					venueDataSet.addItem(newItem);
				}
			}
	
	        
	        private function handleCreationComplete():void
	        {
	                initDataSet();
	                XMLService.send();              
	        }
	        
	        private function errorHandler(evt:FaultEvent):void
	        {
	                Alert.show( "Error: " + evt.fault.message );
	        }
	        
	        private function resultHandler(evt:ResultEvent):void
	        {
	                buildForm(new XML(evt.result));
	        }
	        
	        private function comboBoxHandler( e:Event ):void
	        {
	        	var cBox:ComboBox = e.currentTarget as ComboBox;
	            trace( "You selected: " +  cBox.selectedItem.label );
	            trace( "Data: " +  cBox.selectedItem.data );
	        }
	                
	        private function handleFormSubmit( e:MouseEvent ):void
	        {
				trace( "You clicked the submit button!!!" );	
	        }
	        
	        private function buildForm(xml:XML):void
	        {
	            var lst:XMLList = xml.children();
	            var frmItem:FormItem;
	            var txtInput:TextInput;
	            var btItem:Button;
	            var cBox:ComboBox;
	            var itemMethod:Function;
	                    
	            for(var i:int = 0; i < lst.length(); i++){
	                var x:XMLList = lst[i].children();
	                
	                for(var a:int = 0; a < x.length(); a++){
	                    if(x[a].@inputtype == 'TextInput'){
	                        frmItem = new FormItem();
	                        frmItem.direction = "horizontal";
	                        frmItem.label = x[a].@formlabel;
	                        
	                        txtInput = new TextInput();
	                        txtInput.text = x[a];
	                        frmItem.addChild(txtInput);
	                        
	                    }else if(x[a].@inputtype == 'Button'){
							frmItem  = new FormItem();
	                        frmItem.direction = "horizontal";
	                        frmItem.label = x[a].@formlabel;
	                        
	                       	btItem = new Button();
	                        btItem.label = x[a].@buttonlabel;
	                        itemMethod = this[ x[a].@methodname ] as Function;
	                        btItem.addEventListener(MouseEvent.CLICK, itemMethod);
	                        frmItem.addChild(btItem);
	                                               
	                    }else if(x[a].@inputtype == 'ComboBox'){
	                    	frmItem  = new FormItem();
	                        frmItem.direction = "horizontal";
	                        frmItem.label = x[a].@formlabel;
	                        
	                        cBox = new ComboBox();
	                        itemMethod = this[ x[a].@methodname ] as Function;
	                        cBox.dataProvider = this[ x[a].@dataprovider ] as ArrayCollection;
	                        cBox.addEventListener(Event.CHANGE, itemMethod);
	                        frmItem.addChild(cBox);
	                    	
	                    }else{
	                    	// Support other form field types
	                    	                    	
	                    }
	                    
	                    userInfoForm.addChild(frmItem);
	                    
	                }
	            }
	        }
	                
	    ]]>
        </mx:Script>
        <mx:HTTPService fault="errorHandler(event)" id="XMLService" resultFormat="e4x" url="assets/form_1.xml" result="resultHandler(event)" />
        <mx:Form id="userInfoForm" />
</mx:Application>

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