<lfm status="ok">
<artists user="Ewout1" page="1" perPage="50" totalPages="36" total="1766">
<artist>
<name>Have Heart</name>
<playcount>2582</playcount>
<tagcount>0</tagcount>
<mbid>e519e012-e1a3-4592-b3f6-5a16227ab654</mbid>
<url>http://www.last.fm/music/Have+Heart</url>
<streamable>1</streamable>
<image size="small">http://userserve-ak.last.fm/serve/34/36974461.jpg</image>
<image size="medium">http://userserve-ak.last.fm/serve/64/36974461.jpg</image>
<image size="large">http://userserve-ak.last.fm/serve/126/36974461.jpg</image>
<image size="extralarge">http://userserve-ak.last.fm/serve/252/36974461.jpg</image>
<image size="mega">
http://userserve-ak.last.fm/serve/_/36974461/Have+Heart+s+final+show+of+thei.jpg
</image>
</artist>
...
</lfm>
I have an httpservice that returns this xml-file. What I want to do is put all the names from the artists in one Arraylist. This is my code, but it doesn't work, and searches haven't helped me.
private var arArtists:ArrayList;
arArtists = event.result.artists.artist.name;
As mentioned in a comment by ToddBFisher, you will have to iterate through your XMLList and add each item to the ArrayList. XMLLists inherit directly from the base Object and has no direct inheritance relation to ArrayLists.
This block would work, but will be a point of contention based on the size of your data set.
var list:ArrayList = new ArrayList();
var name:XML;
for each(name in xml.artists.artist.name)
{
list.addItem(name);
}
Best of luck!
Related
I'm using Flash AS3 trying to display random questions from an xml list on stage. When the user clicks an option it should move on to another question but the one they got should be removed from the list so it will not come back.
I have the randomize part okay but can't figure out how to remove the question from the list.
Here is the section I have.
function randomizeQuestion():void {
var numOfQuestions:Number = xmlData.item.length();
var shuffledNumbers:Array = new Array(randomAns.length);
var randomPos:Number = 0;
//Randomizes selected question
currentQuestion = int(Math.random() * numOfQuestions);
//Randomizes answer numbers
for (var i:int = 0; i < shuffledNumbers.length; i++)
{
randomPos = int(Math.random() * randomAns.length);
shuffledNumbers[i] = randomAns.splice(randomPos, 1)[0];
}
randomAns = shuffledNumbers;
correctAns = xmlData.item[currentQuestion].children().(hasOwnProperty("#correct"));
}
Try to get index:
correctAnsIndex = xmlData.item[currentQuestion].children().(hasOwnProperty("#correct")).childIndex();
or if more elements, to get first one:
correctAnsIndex = xmlData.item[currentQuestion].children().(hasOwnProperty("#correct"))[0].childIndex();
then use delete where appropriate, like here:
delete xmlData.item[correctAnsIndex];
I would add another array to your code in which you can store all the questions that are eligible. As a question gets asked, remove it from that array. So you'll have one array of allQuestions and another array of eligibleQuestions. allQuestions can just be a comprehensive list. Then, push all the questions you want to go through into the eligibleQuestions array. As the questions get answered, splice them from the array.
It would be good to also share an example of your XML file that you're loading, but let's use the example below.
<data>
<item>
<question></question>
<option1></option1>
<option2></option2>
</item>
<item>
<question></question>
<option1></option1>
<option2></option2>
</item>
</data>
Based on the code you have, I assume your function is being called each time you want to randomize a question.
Now what you'd want to do is create an array that holds the number of <item> tags you have outside of this function so that you can remove values from it whenever you want.
You can create this var numOfQuestions:Array = new Array(); as a global variable and then initialize it using a loop before you enter the randomizeQuestions() function.
for(var i = 0; i < xmlData['item'].length(); i++)
{
numOfQuestions.push(i);
}
Basically this array will serve as a method of calling a specific item and removing it from the program without altering the actual XML file in any way.
Then whenever you wish to remove an element you use
numOfQuestions.splice(numOfQuestions.indexOf(valueToBeRemoved), 1);
This will search the array for the element you wish to remove and then remove it from the array.
Lastly the randomizeQuestion function has to be modified.
currentQuestion = int(Math.random() * numOfQuestions.length); //since numOfQuestions is now an array instead of a Number
I have the following datagrid:
<controls:MDataGrid id="holdrules_datagrid" width="100%" height="100%"
allowMultipleSelection="true" dataProvider="{holdRuleDataList.holdRuleDataList}" >
I am trying to get all the selected rows from this, but the value is not getting stored, and is giving me null in the Java layer
var arr:ArrayCollection = new ArrayCollection;
arr = holdrules_datagrid.selectedItems as ArrayCollection
Can anyone please help me with what is wrong here?
DataGrid.selectedItems is an Array, not an ArrayCollection. If you want an ArrayCollection you'll something like:
arr.source = holdrules_datagrid.selectedItems;
This may still not be quite what you want. I haven't tried this myself, but I believe that this will just reference selectedItems, so if the selection changes then arr would also be updated. If you want a copy of the selection at the time of selection, you'll need a copy of the array:
arr.source = holdRules_datagrid.selectedItems.slice();
As the pic show(This is drawn by PhotoShop, not implemented yet), I want to implemnt a List like this one. It has different column count, say the first row has only one item, and the others have two items . I tried to use itemRendererFunction to detect the different item(the first row treat as a rendererA, the others treat as another rendererB),but it didn't work.
The cleanest solution to this problem, is to create a custom layout (we've discussed in the comments how Romi's solution will eventually cause too many problems). However, this is usually not an easy thing to do.
I will give you a rough sketch of what this custom layout might look like, so you can use it as a starting point to create one that does exactly what you need.
To create a custom layout, you must subclass BaseLayout and override and implement its updateDisplayList and measure methods.
To make things easier (and in order not to dump 500 lines of code in here), I used some hardcoded variables for this example. It assumes there will always be two columns, the first item will always be 200x200 px, and the other items will always be 100x100 px. There is no horizontalGap or verticalGap.
The consequence is of course that you can use this custom layout (as it is now) only for this specific List and these specific ItemRenderers. If you want it to be more generic, you'll have to do a lot more calculations.
But now for the code:
public class MyCustomLayout extends LayoutBase {
//hardcoded variables
private var columnCount:int = 2;
private var bigTileWidth:Number = 200;
private var bigTileHeight:Number = 200;
private var smallTileWidth:Number = 100;
private var smallTileHeight:Number = 100;
override public function updateDisplayList(width:Number, height:Number):void {
var layoutTarget:GroupBase = target;
if (!layoutTarget) return;
var numElements:int = layoutTarget.numElements;
if (!numElements) return;
//position and size the first element
var el:ILayoutElement = useVirtualLayout ?
layoutTarget.getVirtualElementAt(0) : layoutTarget.getElementAt(0);
el.setLayoutBoundsSize(bigTileWidth, bigTileHeight);
el.setLayoutBoundsPosition(0, 0);
//position & size the other elements in 2 columns below the 1st element
for (var i:int=1; i<numElements; i++) {
var x:Number = smallTileWidth * ((i-1) % 2);
var y:Number = smallTileHeight * Math.floor((i-1) / 2) + bigTileHeight;
el = useVirtualLayout ?
layoutTarget.getVirtualElementAt(i) :
layoutTarget.getElementAt(i);
el.setLayoutBoundsSize(smallTileWidth, smallTileHeight);
el.setLayoutBoundsPosition(x, y);
}
//set the content size (necessary for scrolling)
layoutTarget.setContentSize(
layoutTarget.measuredWidth, layoutTarget.measuredHeight
);
}
override public function measure():void {
var layoutTarget:GroupBase = target;
if (!layoutTarget) return;
var rowCount:int = Math.ceil((layoutTarget.numElements - 1) / 2);
//measure the total width and height
layoutTarget.measuredWidth = layoutTarget.measuredMinWidth =
Math.max(smallTileWidth * columnCount, bigTileWidth);
layoutTarget.measuredHeight = layoutTarget.measuredMinHeight =
bigTileHeight + smallTileHeight * rowCount;
}
}
And you can use it like this:
<s:List dataProvider="{dp}" height="300">
<s:layout>
<l:MyCustomLayout />
</s:layout>
</s:List>
Whenever you want to change the defined behavior of an existing component, always check first if you can solve the problem with skinning. It is a really powerful feature i Flex, and can also provide a solution in this case.
So, let's begin, assuming you already have your List, you only need to create a custom skin which "splits" the data provider in two parts, the first item, and all the others. So, let's assume we have this initial setup:
<fx:Script>
<![CDATA[
import mx.collections.ArrayCollection;
[Bindable]
private var c:ArrayCollection = new ArrayCollection([
"String 1",
"String 2",
"String 3",
"String 4",
"String 5",
"String 6",
"String 7",
"String 8",
"String 9",
"String 10",
"String 11",
"String 12",
"String 13",
"String 14",
"String 15"]);
]]>
</fx:Script>
<s:List skinClass="CustomSkinList" dataProvider="{c}" />
As you can see, we define a custom list skin, which is just a copy of spark.skins.spark.ListSkin, the default skin for spark.components.List element.
Before we handle the data provider logic, we need to take a look at how the list items are rendered. This is done by using a DataGroup element, added to the skin, like so:
<s:Scroller left="0" top="0" right="0" bottom="0" id="scroller" minViewportInset="1" hasFocusableChildren="false">
<!--- #copy spark.components.SkinnableDataContainer#dataGroup -->
<s:DataGroup id="dataGroup" itemRenderer="spark.skins.spark.DefaultItemRenderer">
<s:layout>
<!--- The default layout is vertical and measures at least for 5 rows.
When switching to a different layout, HorizontalLayout for example,
make sure to adjust the minWidth, minHeight sizes of the skin -->
<s:VerticalLayout gap="0" horizontalAlign="contentJustify" requestedMinRowCount="5" />
</s:layout>
</s:DataGroup>
</s:Scroller>
Here is the place where we will have to make the changes, in order to get the first element to render differently. What we need to do, is just add another DataGroup, for rendering the first element in a custom way (this of course means using a custom item renderer). Now, our scroller looks like this:
<s:Scroller left="0"
top="0"
right="0"
bottom="0"
id="scroller"
minViewportInset="1"
hasFocusableChildren="false">
<!--- #copy spark.components.SkinnableDataContainer#dataGroup -->
<s:VGroup width="100%" height="100%">
<s:DataGroup id="firstItemDataGroup"
width="100%"
itemRenderer="CustomItemRenderer"
height="20">
<s:layout>
<s:VerticalLayout />
</s:layout>
</s:DataGroup>
<s:DataGroup id="dataGroup" itemRenderer="spark.skins.spark.DefaultItemRenderer">
<s:layout>
<!--- The default layout is vertical and measures at least for 5 rows.
When switching to a different layout, HorizontalLayout for example,
make sure to adjust the minWidth, minHeight sizes of the skin -->
<s:TileLayout horizontalAlign="center" requestedColumnCount="2" />
</s:layout>
</s:DataGroup>
</s:VGroup>
</s:Scroller>
Notice the 'firstItemDataGroup' addition, also the fact that it uses a different item renderer, than the default dataGroup element. With this new container in place we can proceed to render the elements. The custom skin need to override the parent initializationComplete() method, like so:
override protected function initializationComplete():void
{
useChromeColor = true;
if (hostComponent.dataProvider && hostComponent.dataProvider.length > 0)
{
var allItems:Array = hostComponent.dataProvider.toArray().concat();
firstItemDataGroup.dataProvider = new ArrayCollection([hostComponent.dataProvider.getItemAt(0)]);
var remainingItems:Array = allItems.concat().reverse();
remainingItems.pop();
var reversed:Array = remainingItems.reverse();
dataGroupProvider = new ArrayCollection(reversed);
}
super.initializationComplete();
}
What was added was just the 'if' block, and a private variable, named dataGroupProvider. This is because we will set the new dataProvider, the one starting from the second element, to the dataGroup element, in the updateDisplayList() method. Here is what it looks like:
override protected function updateDisplayList(unscaledWidth:Number, unscaledHeight:Number):void
{
if (getStyle("borderVisible") == true)
{
border.visible = true;
background.left = background.top = background.right = background.bottom = 1;
scroller.minViewportInset = 1;
}
else
{
border.visible = false;
background.left = background.top = background.right = background.bottom = 0;
scroller.minViewportInset = 0;
}
// Here we assign the new data provider to the dataGroup element
if (dataGroupProvider)
dataGroup.dataProvider = dataGroupProvider;
borderStroke.color = getStyle("borderColor");
borderStroke.alpha = getStyle("borderAlpha");
super.updateDisplayList(unscaledWidth, unscaledHeight);
}
In conclusion, just by creating a custom skin for our List element, we can use two containers for rendering the first item in a different way, from the rest of the elements. You shouldn't underestimate the power of Flex Skinning :)
Hope this helps. Have a great day!
I´m trying to get the 7 TextAreas on the stage on FlashBuilder,all of them have the id as "Desc1","Desc2","Desc3"... and the names are the same "Desc1","Desc2","Desc3"..., but when i try to get it,i get a error of a null object...
for(var i:int = 0;i<7;i++)
{
trace((stage.getChildByName("Desc"+(i+1))as TextArea).x);
}
I searched the web and dont find either any method of "getChildByID"
Flex IDs don't work with getChildByName(). getChildByName() is designed to work with ids of nested elements in Adobe Flash CS.
An flex id is an explicit declaration of a class member with name which is equal to the id.
Due to the lack of macro in the actionscript laguage you cannot automate the creation of such lists of controls.
You can manually create an Vector or an Array of the text areas and use it in other part of your code to automatically iterate over your TextAreas:
var text_areas:Vector.<TextArea> = new Vector.<TextArea>();
text_areas.push(Desc1, Desc2, Desc3);
// or you can do this
var text_areas2:Array = [];
text_areas["Desc1"] = Desc1;
text_areas["Desc2"] = Desc2;
text_areas["Desc3"] = Desc3;
// Now you can iterate over the text areas
for each (var a_text_area:TextArea in text_areas)
{
....
}
Or you can create a flex Array:
<fx:Array id="textAreas">
<s:TextArea id="textArea1"/>
<s:TextArea id="textArea2" x="397" y="0"/>
<s:TextArea id="textArea3" x="201" y="1"/>
</fx:Array>
I'm setting selected element in s:List component with Actionscript, it works, but List doesn't scroll to selected item -- need to scroll with scrollbar or mouse. Is it possible to auto-scroll to selected item ? Thanks !
Try the s:List method ensureIndexIsVisible(index:int):void.
For Spark:
list.ensureIndexIsVisible(index);
This function will scroll to the top of the list in Flex 4+. It takes in account the height of the item, so it will work for lists with different items with different height.
private function scrollToIndex(list:List,index:int):void
{
if (!list.layout)
return;
var dataGroup:DataGroup = list.dataGroup;
var spDelta:Point = dataGroup.layout.getScrollPositionDeltaToElement(index);
if (spDelta)
{
dataGroup.horizontalScrollPosition += spDelta.x;
//move it to the top if the list has enough items
if(spDelta.y > 0)
{
var maxVSP:Number = dataGroup.contentHeight - dataGroup.height;
var itemBounds:Rectangle = list.layout.getElementBounds(index);
var newHeight:Number = dataGroup.verticalScrollPosition + spDelta.y
+ dataGroup.height - itemBounds.height;
dataGroup.verticalScrollPosition = Math.min(maxVSP, newHeight);
}
else
{
dataGroup.verticalScrollPosition += spDelta.y;
}
}
}
//try this
this.callLater(updateIndex);//where you want to set the selectedIndex
private function updateIndex():void
{
list.selectedIndex = newIndex;
list.ensureIndexIsVisible(newIndex);
}
In flex-3 there is a scrollToIndex method and hence you can call
list.scrollToIndex(list.selectedIndex);
I believe this should work in flex-4 too.
This worked for me. had to use the callLater.
list.selectedItem = "MyTestItem"; //or list.selectedIndex = 10;
this.callLater(updateIndex); //dispatch an update to list
private function updateIndex():void {
list.ensureIndexIsVisible(list.selectedIndex);
}
I saw this basic idea here...
http://arthurnn.com/blog/2011/01/12/coverflow-layout-for-flex-4/
public function scrollGroup( n : int ) : void
{
var scrollPoint : Point = theList.layout.getScrollPositionDeltaToElement( n );
var duration : Number = ( Math.max( scrollPoint.x, theList.layout.target.horizontalScrollPosition ) - Math.min( scrollPoint.x, theList.layout.target.horizontalScrollPosition )) * .01;
Tweener.addTween(theList.layout,{ horizontalScrollPosition: scrollPoint.x , time:duration});
}
protected function theList_caretChangeHandler(event:IndexChangeEvent):void
{
scrollGroup( event.newIndex );
event.target.invalidateDisplayList();
}
You'll probably want to access the List's scroller directly and do something like:
list.scroller.scrollRect.y = list.itemRenderer.height * index;
You can multiply the height of an element by its index and pass this value to:
yourListID.scroller.viewport.verticalScrollPosition
It is a bug - you can see the demonstration and a workaround at the https://issues.apache.org/jira/browse/FLEX-33660
This custom List component extension worked for me:
<s:List
xmlns:fx="http://ns.adobe.com/mxml/2009"
xmlns:s="library://ns.adobe.com/flex/spark"
valueCommit="callLater(ensureIndexIsVisible, [selectedIndex])">
</s:List>
I recently accomplished this in one of my projects by having a defined size for my items in the group..
<s:Scroller x="940" y="0" maxHeight="465" maxWidth="940" horizontalScrollPolicy="off" verticalScrollPolicy="off">
<s:HGroup id="tutPane" columnWidth="940" variableColumnWidth="false" gap="0" x="0" y="0">
</s:HGroup>
</s:Scroller>
Following this my button controls for manipulation worked by incrementing a private "targetindex" variable, then I called a checkAnimation function, which used the Animate class, in combo with a SimpleMotionPath and a comparison between tutpane.firstIndexInView and target index. This modified the "horizontalScrollPosition" of the group.
This allowed separate controls to essentially act as a scroll bar, but I had the requirement of sliding the control to view the selected item.. I believe this technique could work for automated selection of items as well