WinJS.Binding.List-找不到键值

您正在推动的是列表中对象的值,该键在内部分配为一个递增的整数值。如果你打开 base.js 在项目中的WindowsLibraryforJavaScript1.0参考中,您将看到以下的实现 push .

记下对的呼叫 this._assignKey() 。此值在中返回给您 oniteminserted 处理程序

push: function (value) {
    /// <signature helpKeyword="WinJS.Binding.List.push">
    /// <summary locid="WinJS.Binding.List.push">
    /// Appends new element(s) to a list, and returns the new length of the list.
    /// </summary>
    /// <param name="value" type="Object" parameterArray="true" locid="WinJS.Binding.List.push_p:value">The element to insert at the end of the list.</param>
    /// <returns type="Number" integer="true" locid="WinJS.Binding.List.push_returnValue">The new length of the list.</returns>
    /// </signature>
    this._initializeKeys();
    var length = arguments.length;
    for (var i = 0; i < length; i++) {
        var item = arguments[i];
        if (this._binding) {
            item = WinJS.Binding.as(item);
        }
        var key = this._assignKey();
        this._keys.push(key);
        if (this._data) {
            this._modifyingData++;
            try {
                this._data.push(arguments[i])
            } finally {
                this._modifyingData--;
            }
        }
        this._keyMap[key] = { handle: key, key: key, data: item };
        this._notifyItemInserted(key, this._keys.length - 1, item);
    }
    return this.length;
},

因此,如果您将以下内容添加到代码中,您将获得稍后可以使用的值(假设您将其与您按下的“键”相关联)。

testList.oniteminserted = function (e) {
    var newKey = e.detail.key;
};