如何在Grip应用模板中识别特定的属性？

Question

我正在为Windows开发一个，我在代码中做了一些修改，这是data.js中的第一个

var sampleItems = [
        { group: sampleGroups[0], itemClass: "item2", title: "Pupusas:", subtitle: "Item Subtitle: 1", description: itemDescription, content: itemContent, backgroundImage: "/images/dishes/horizontal/comidas.jpg" },
        { group: sampleGroups[0], itemClass: "item", title: "Atol Shuco:", subtitle: "Item Subtitle: 2", description: itemDescription, content: itemContent, backgroundImage: "/images/dishes/thumbnails/bebidas/atol_shuco.jpg" },
        { group: sampleGroups[0], itemClass: "item", title: "Pan con Pollo:", subtitle: "Item Subtitle: 3", description: itemDescription, content: itemContent, backgroundImage: "/images/dishes/thumbnails/comidas/pan_pollo.jpg" },
        { group: sampleGroups[0], itemClass: "item", title: "Nuegados de Huevo:", subtitle: "Item Subtitle: 4", description: itemDescription, content: itemContent, backgroundImage: "/images/dishes/thumbnails/postres/nuegados.jpg" },
        { group: sampleGroups[0], itemClass: "item", title: "Frijoles Borrachos:", subtitle: "Item Subtitle: 5", description: itemDescription, content: itemContent, backgroundImage: "/images/dishes/thumbnails/comidas/frijoles_borrachos.jpg" }];

如您所见，我添加了一个名为itemClass的属性，它确定了我将要使用的CSS类，其结果是：http://social.msdn.microsoft.com/Forums/getfile/214473

我知道这很好，但我的问题是，您看到的所有图片都是项目，我需要大型图片必须是组，我有组代码和groupedItem.js项代码，虽然我不知道如何合并它们，这是代码，这两个代码都必须在_initializeLayout: function (listView，viewState)中:这是项的代码：

            listView.itemDataSource = Data.items.dataSource;
            listView.groupDataSource = Data.groups.dataSource;

这是针对各小组的：

        listView.itemDataSource = Data.groups.dataSource;
        listView.groupDataSource = null;

我想知道，我如何识别"item2"？并选择项目中的组。

Answer 1

对items索引使用args.detail.itemIndex。这是获取索引的正确方法；您从getAt调用中获得的项是您的数据项，除非您在其上添加了索引，否则它将没有索引属性。