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我想从我的应用程序中的itemDataSource中删除所有项目。 itemDataSource被绑定到一个列表视图。为什么不清除这个itemDataSource?
我已经成功地删除时,它的点击在列表视图中的单个项目,但删除所有项目引起了我的问题:(
这是我以前从itemDataSource删除单个项目的代码:
//remove the clicked playlist item
var ds = document.getElementById("PlaylistListView").winControl.itemDataSource;
ds.beginEdits();
ds.remove(ds.itemFromIndex(eventInfo.detail.itemPromise._value.index)._value.key);
ds.endEdits();
这是我一直试图写入删除所有项目代码:
var ds = document.getElementById("PlaylistListView").winControl.itemDataSource;
ds.beginEdits();
console.log(ds._list._keys);
console.log("There are " + ds._list._keys.length + " items in this list");
for (var i = 0; i < ds._list._keys.length; i++) {
ds.remove(ds._list._keys[i]);
console.log("Item: " + ds._list._keys[i] + " has been removed from the list");
}
ds.endEdits();
这是我收到的控制台输出,当我运行这款C颂:
1,2,3,4,5,6,7,8,9,10,11
There are 11 items in this list
Item: 2 has been removed from the list
Item: 4 has been removed from the list
Item: 6 has been removed from the list
Item: 8 has been removed from the list
Item: 10 has been removed from the list
Item: undefined has been removed from the list
为什么只被删除一些项目?输出如预期的那样,但是导致项目1,3,5,7,9, and 11
不能被删除的原因是什么?我注意到序列中有一个模式,每次都是2。
任何帮助,将不胜感激:)