我正在构建一个应用程序，允许用户将冰箱中的成分添加到列表中，然后根据他们列出的成分搜索所有潜在的配方。
我正在使用XML数据，这些数据以相当简单的模式设置，如下所示：
<items>
<item category="meat">chicken</item>
<item category="meat">beef</item>
<item category="vegetable">green beans</item>
</items>
我的应用程序的滚动列表部分基于NetTuts教程（http://active.tutsplus.com/tutorials/actionscript/create-a-smooth-rolling-scroller-with-as3/）。我希望能够通过XML属性（即上面的'category'属性）以编程方式过滤我的列表。
以下是我的完整文档类（我不确定要包含哪些功能以排除它们可能很重要）。您应该注意的函数是dataLoaded()，它解析XML数据并将其放入TextField和dataLoad()，它实例化URLLoader对象以加载XML。我的文档类的名称是RecipeMatcher，它的构造函数也是相同的。
我想我已经很好地评论了它，所以在变量和函数的目的上不应该有太多的问号。
package
{
' Imports (All- Unsorted) '
import flash.display.MovieClip;
import flash.events.MouseEvent;
import flash.events.Event;
import flash.net.URLRequest;
import flash.net.URLLoader;
import flash.text.TextFormat;
import flash.text.TextField;
import flash.text.TextFieldAutoSize;
import flash.text.Font;
import flash.display.Shape;
import gs.*;
public class RecipeMatcher extends MovieClip
{
'Variable declaration'
// ------------------- //
'Main Structural elements'
private var _pad:MovieClip;
public var _addIngredient:MovieClip;
private var _container:MovieClip;
'Ingredient Wizard Structural Elements'
public var _ingredientWizard:MovieClip;
private var _CollapsePanelMeat:MovieClip;
private var _CollapsePanelVeg:MovieClip;
private var _CollapsePanelCarbs:MovieClip;
private var _CollapsePanelCuisine:MovieClip;
private var _CollapseMealType:MovieClip;
private var _CollapseOther:MovieClip;
'Data (XML) Elements'
public var loader:URLLoader;
public var data:XML;
public var items:XMLList;
'Positioning of xml data in container - ("Text")'
private var _item:Item;
private var _itemTextField:TextField;
private var _defaultFormat:TextFormat = new TextFormat();
private var _arialRounded:Font = new ArialRounded();
private var _textFieldXPosition:uint = 10;
private var _textFieldYPosition:uint = 13;
private var _textFieldWidth:uint = 540;
private var _textFieldPaddingLeft:uint = 20;
private var _textFieldHeight:uint = 150;
private var _itemPosition:uint = 49;
'newIngredientsWizard positioning'
private var _addNewIngredientsXPosition:uint = 322;
private var _addNewIngredientsYPosition:uint = 500;
'input mask - container'
private var _mask:Shape;
private var _maskWidth:uint = 580;
private var _maskHeight:uint = 540;
private var _paddingTop:uint = 220;
'background for container '
private var _background:Shape;
'scroll speed properties'
private var _maxSpeed:uint = 15;
private var _speed:Number;
'End of variable declarations'
//----------------------------------//
//---------Constructor Function---------//
public function RecipeMatcher()
{
'Constructor for the function RecipeMatcher '
_addIngredient = new addIngredient();
_ingredientWizard = new ingredientDialog();
_pad = new Pad();
addChild(_pad);
_ingredientWizard.visible = false;
_pad.x = stage.stageWidth / 2 - _pad.width / 2;
_pad.y = stage.stageHeight / 2 - _pad.height / 2;
'Event listener for add ingredient button inside of pad movieclip '
_pad.btn_add.addEventListener(MouseEvent.CLICK, addNewIngredient);
_container = new MovieClip();
addChild(_container);
dataLoad();
}
//-- BEGINNING OF LISTENER FUNCTIONS TO FOOD CATEGORY PAGES - PART OF INGREDIENT WIZARD --//
function displayMeat(event:MouseEvent):void {
_ingredientWizard.visible = false;
}
function displayVeg(event:MouseEvent):void {
_ingredientWizard.visible = false;
}
function displayCarbs(event:MouseEvent):void {
_ingredientWizard.visible = false;
}
function displayCuisine(event:MouseEvent):void {
_ingredientWizard.visible = false;
}
function displayMealType(event:MouseEvent):void {
_ingredientWizard.visible = false;
}
function displayOther(event:MouseEvent):void {
_ingredientWizard.visible = false;
}
//-- This function is the accompanying function for the event listener in the constructor that listens for clicks on the ingredient items --//
function itemclicked(event:MouseEvent):void {
_itemTextField = new TextField();
trace(_itemTextField.text);
}
//-- This function makes all of the elements of the scrolling list invisible, whilst the Add New Ingredients Wizard is displayed to the user //
function addNewIngredient(event:MouseEvent):void
{
_pad.visible = false;
_container.visible = false;
trace("screen wipe");
_ingredientWizard = new ingredientDialog();
addChild(_ingredientWizard);
_ingredientWizard.x = stage.stageWidth / 2 - _ingredientWizard.width / 2;
_ingredientWizard.y = stage.stageHeight / 2 - _ingredientWizard.height / 2;
_ingredientWizard.collapse_meat.btn_submit.addEventListener(MouseEvent.CLICK, displayMeat);
_ingredientWizard.collapse_veg.btn_submit.addEventListener(MouseEvent.CLICK, displayVeg);
_ingredientWizard.collapse_carbs.btn_submit.addEventListener(MouseEvent.CLICK, displayCarbs);
_ingredientWizard.collapse_cuisine.btn_submit.addEventListener(MouseEvent.CLICK, displayCuisine);
_ingredientWizard.collapse_mealtype.btn_submit.addEventListener(MouseEvent.CLICK, displayMealType);
_ingredientWizard.collapse_otherdietarypreferences.btn_submit.addEventListener(MouseEvent.CLICK, displayOther);
'Submit all ingredient choices button listener'
_ingredientWizard.btn_submit.addEventListener(MouseEvent.CLICK, submitIngredientChoices);
}
function submitIngredientChoices(event:MouseEvent):void {
trace("submitted ingredients");
}
private function dataLoad():void {
'instantiates URLLoader object'
loader = new URLLoader();
' listens to see if data has fully loaded'
loader.addEventListener(Event.COMPLETE, dataLoaded);
'loads local xml file with URLrequest method'
loader.load(new URLRequest("data.xml"));
}
private function dataLoaded(event:Event):void {
' this holds the loaded xml data '
data = new XML(event.target.data);
'items properties call - add other calls to master properties later on'
items = data.item;
' tracing name of all categories in xml doc'
trace(data.item.@category);
' parsing of each ingredient'
for (var i = 0; i < items.length(); i++) {
// instantiation of mcItem (the stage for each item)
_item = new Item();
// sets 'over' layer to invisible / transparent //
_item.item_btn_over.alpha = 0;
// creates the var itemTextField //
_itemTextField = new TextField();
// _itemTextField visual attributes //
_itemTextField.x = _textFieldXPosition + _textFieldPaddingLeft;
_itemTextField.y = _textFieldYPosition;
_itemTextField.selectable = true;
_itemTextField.wordWrap = true;
_itemTextField.width = _textFieldWidth;
_itemTextField.height = _textFieldHeight;
_itemTextField.embedFonts = true;
_defaultFormat.color = 0x111112;
_defaultFormat.font = _arialRounded.fontName;
_defaultFormat.size = 18;
_itemTextField.defaultTextFormat = _defaultFormat;
_itemTextField.text = items[i].toString();
//adds textfield to displaylist//
_item.addChild(_itemTextField);
//vertical positioning//
_item.y = i * _itemPosition;
_item.buttonMode = true;
_item.mouseChildren = false;
//adds items to container displaylist//
_container.addChild(_item);
_item.addEventListener(MouseEvent.CLICK, itemclicked);
}
' Input Mask'
_mask = new Shape();
_mask.graphics.beginFill(0xFF0000);
_mask.graphics.drawRect(0, 0, _maskWidth, _maskHeight);
_mask.graphics.endFill();
' Positioning of input mask'
// horizontal centering of input mask//
_mask.x = stage.stageWidth / 2 - _container.width / 2;
_mask.y = _paddingTop;
// adds the mask onto the stage//
addChild(_mask);
// assigns the above mask to the container //
_container.mask = _mask;
' Positioning of container with the mask'
// horizontal centering of container //
_container.x = stage.stageWidth / 2 - _container.width / 2;
// vertical position of container //
_container.y = _paddingTop;
'Container background stylings'
_background = new Shape();
_background.graphics.beginFill(0xFFFFFF);
_background.graphics.drawRect(0, 0, _container.width, _container.height);
_background.graphics.endFill();
_container.addChildAt(_background, 0);
'End of container background stylings'
_container.addEventListener(MouseEvent.MOUSE_OVER, movingOver);
_container.addEventListener(MouseEvent.MOUSE_OUT, movingOut);
}
'function: movingOver (MOUSE_OVER) EVENT '
private function movingOver (event:MouseEvent):void {
_container.removeEventListener(MouseEvent.MOUSE_OVER, movingOver);
addEventListener(Event.ENTER_FRAME, enterFrame);
if (event.target is Item)
TweenMax.to(Item(event.target).item_btn_over, .2, {alpha:1});
}
'function: movingOut (MOUSE_OUT) EVENT '
private function movingOut (event:MouseEvent):void {
removeEventListener(Event.ENTER_FRAME, enterFrame);
_container.addEventListener(MouseEvent.MOUSE_OVER, movingOver);
if (event.target is Item)
TweenMax.to(Item(event.target).item_btn_over, .2, {alpha:0});
}
'ENTER_FRAME listener function to gauge scrolling speed based on touch / mouse position + events'
function enterFrame(event:Event):void {
_speed = (_mask.height / 2 - _mask.mouseY) / (_mask.height / 2) * _maxSpeed;
_container.y += _speed;
if (_container.y >= _paddingTop) {
removeEventListener(Event.ENTER_FRAME, enterFrame);
_container.y = _paddingTop;
}
if (_container.y <= _mask.height - _container.height + _paddingTop) {
removeEventListener(Event.ENTER_FRAME, enterFrame);
_container.y = _mask.height - _container.height + _paddingTop;
}
}
}
}
Answerers，在您突出显示必要的功能后，可以随意将我的代码编辑为可管理的大小。
编辑：我已经设法在互联网上找到了这段代码，你可以在我的代码中看到，但它只列出了实际的类别，而不是列出了类别中的所有项目。我在AS3上做得还不够好。 ' tracing name of all categories in xml doc'
trace(data.item.@category);
答案 0 :(得分：1)
您必须按下一行搜索：
const lookingCategoryName : String = "meat";
const findedItemsXMLList : XMLList = data.item.(@category == lookingCategoryName);
trace(findedItemsXMLList.toXMLString());