关闭问题？ - 传递变量的当前值

Question

我试图在单击动态生成的导航“节点”时传递变量的当前值。这只需是一个整数，但它总是会导致最后一个节点的值..尝试了一些不同的方法来传递值，自定义事件侦听器，设置器，但我怀疑这是一个闭包问题..将不胜感激;-)

function callGrid():void {

    for (var i:Number = 0; i < my_total; i++) {

        var gridnode_url = my_grid[i].@gridnode;
        var news_category= my_grid[i].@category;
        var newstitle = my_grid[i].@newstitle;
        var news_content = my_grid[i]..news_content;
        var news_image = my_grid[i]..news_image;

        var gridnode_loader = new Loader();
        container_mc.addChild(gridnode_loader);
        container_mc.mouseChildren = false;
        gridnode_loader.load(new URLRequest(gridnode_url));
        gridnode_loader.contentLoaderInfo.addEventListener(Event.COMPLETE, gridLoaded);
        gridnode_loader.name = i;

        text_container_mc = new MovieClip();
        text_container_mc.x = 0;
        text_container_mc.mouseEnabled = false;
        var textY = text_container_mc.y = (my_gridnode_height+18)*y_counter;
        addChild(text_container_mc);
        var tf:TextSplash=new TextSplash(newstitle,10,0,4 );
        container_mc.addChild(tf);
        tf.mouseEnabled = false;
        tf.height = my_gridnode_height;
        text_container_mc.addChild(tf); 
        var text_container_mc_tween = new Tween(text_container_mc, "alpha", Strong.easeIn, 0,1,0.1, true);

        gridnode_loader.x = (my_gridnode_width+5) * x_counter;
        gridnode_loader.y = (my_gridnode_height+15) * y_counter;

        if (x_counter+1 < columns) {
            x_counter++;
        } else {
            x_counter = 0;
            y_counter++;
        }
    }
}
function gridLoaded(e:Event):void {
    var i:uint;
    var my_gridnode:Loader = Loader(e.target.loader);
    container_mc.addChild(my_gridnode);
    _xmlnewstarget = my_gridnode.name;

//

Answer 1

Answer 2

Answer 3

Answer 4

//when a particular grid node is clicked I need to send the current _xmlnewstarget value to the LoadNewsContent function...
//

Answer 5

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Answer 6

Answer 7

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my_tweens[Number(my_gridnode.name)]=new Tween(my_gridnode, "alpha", Strong.easeIn, 0,1,0.1, true);
my_gridnode.contentLoaderInfo.removeEventListener(Event.COMPLETE, gridLoaded);
my_gridnode.addEventListener(MouseEvent.CLICK, loadNewsContent);

}

function loadNewsContent(e:MouseEvent):void {
createNewsContainer();
getXMLNewsTarget();
news_category = my_grid[_xmlnewstarget].@category;
var tfnews_category:TextSplash=new TextSplash(news_category,20,16,32,false,false,0xffffff );
tfnews_category.mouseEnabled = false;

newstitle = my_grid[_xmlnewstarget].@newstitle;
var tftitle:TextSplash=new TextSplash(newstitle,20,70,24,false,false,0x333333 );
news_container_mc.addChild(tftitle);
tftitle.mouseEnabled = false;

news_content = my_grid[_xmlnewstarget]..news_content;
var tfnews_content:TextSplash=new TextSplash(news_content,20,110,20,true,true,0x333333,330);
news_container_mc.addChild(tfnews_content);
tfnews_content.mouseEnabled = false;
news_image = my_grid[_xmlnewstarget].@news_image;
loadNewsImage();
addChild(tfnews_category);
addChild(tftitle);
addChild(tfnews_content);

var news_container_mc_tween = new Tween(news_container_mc, "alpha", Strong.easeIn, 0,1,0.3, true);
news_container_mc_tween.addEventListener(Event.INIT, newsContentLoaded);
}

Answer 8

我不会尝试阅读您的代码（尝试处理您的格式，即使它只是缩进），但我将提供一个简化的示例：

for (var i = 0; i < my_total; i++) {
    var closure = function() {
        // use i here
    }
}

正如您所说，当调用 closure 时它将包含 i 的最后一个值（在本例中为 my_total）。这样做：

for (var i = 0; i < my_total; i++) {
    (function(i) {
        var closure = function() {
            // use i here
        }
    })(i);
}

这会在循环内创建另一个函数，该函数“捕获”i 的当前值，以便您的闭包可以引用该值。

另请参阅 (函数( ) {})() 构造工作以及人们为什么使用它？以获取更多类似的示例。

Answer 9

嗯，如上所述，代码有点密集，但我认为你可能在字符串和整数之间遇到一些类型转换问题，“最后一个值”总是0吗？尝试做出这些改变并让我知道你的进展如何。

// replace this gridnode_loader.name = i;
gridnode_loader.name = i.toString();

// explictly type this as an int
_xmlnewstarget = parseInt(my_gridnode.name);

// replace this: my_tweens[Number(my_gridnode.name)] = new Tween(......
my_tweens[parseInt(my_gridnode.name)] = new Tween();

哦，我认为不言而喻，一旦你让它工作，你应该大规模地重构这个代码块。

编辑：经过进一步研究，我认为您需要这个

//replace this: my_gridnode.addEventListener(MouseEvent.CLICK, loadNewsContent);

var anonHandler:Function = function(e:MouseEvent):void
{
    loadNewsContent(_xmlnewstarget);

};
my_gridnode.addEventListener(MouseEvent.CLICK, anonHandler);

，其中您的 loadNewsContent 已将争论从 (e:MouseEvent) 更改为 (id:String)

Answer 10

首先，您不需要为同一个加载程序调用 addChild 两次（一次在 callGrid 中），然后在 (gridLoaded) 中调用。然后你可以尝试放入 loadNewsContent:
news_category = my_grid[int(e.target.name)].@category;
而不是
news_category = my_grid[ _xmlnewstarget].@category;
由于 _xmlnewstarget 的范围似乎更大，这就是为什么每次加载操作完成时它都会更新。