javascript - 使用模板排序表

Question

我在带有列的桌子上进行了淘汰赛绑定。我试图为每一列实现表格排序。视图如下所示：

<table id="notes" class="notes_table">
                            <tr class="head">
                                <th data-bind='click: function() { SortItems("CreatedDate")}'>
                                    <span>Date</span>
                                </th>
                                <th data-bind='click: function() { SortItems("Type")}'>
                                    <span>Type</span>
                                </th>
                                <th data-bind='click: function() { SortItems("Category")}'>
                                    <span>Category</span>
                                </th>
                                <th data-bind='click: function() {SortItems("AddedBy")}'>
                                    <span>Added by</span>
                                </th>
                             </tr>
                            <tbody data-bind="template: { name: 'StudentNote', foreach: notes }"></tbody>
                        </table>
                        <script type="text/html" id="StudentNote">
                            <tr class="even">
                                <td><span data-bind="text: CreatedDate"></span></td>
                                <td><span data-bind="text: Type"></span></td>
                                <td><span data-bind="text: Category"></span></td>
                                <td><span data-bind="text: AddedBy"></span></td>
                            </tr>
                        </script>

和 javascript 是这样的：

function notesViewModel() {
    var _this = {};
    _this.colName = "CreatedDate";
    _this.sortOrder = "desc";
    _this.notes = ko.observableArray();
 _this.SortItems = function (ColumnName) {

        var newNotes = _this.notes();
        if (_this.sortOrder === "desc") {
            this.notes(newNotes.sort(notesViewModel._getSortFunction = function (a, b) {
                _this.sortOrder = "asc";
                return a[ColumnName] < b[ColumnName] ? -1 : 1;
            }));

        } else {
            this.notes(newNotes.sort(notesViewModel._getSortFunction = function (a, b) {
                _this.sortOrder = "desc";
                return a[ColumnName] > b[ColumnName] ? -1 : 1;
            }));
        }
    };
 ko.applyBindings(_this, $("body").get(0));
 return _this;

即使它进行排序，它只是在每一列的升序和降序排序之间切换，但不识别它正在排序的列..如何按每列排序..

Answer 1

尝试这个：

function notesViewModel() {
    var _this = {};
    _this.colName = "CreatedDate";
    _this.sortOrder = 1;
    _this.notes = ko.observableArray();
    _this.SortItems = function (ColumnName) {
        if(ColumnName == _this.colName)
            _this.sortOrder = _this.sortOrder * -1;
        else
            _this.colName = ColumnName;

        _this.notes.sort(function (a, b) {
            return (a[ColumnName] < b[ColumnName] ? -1 : 1) * _this.sortOrder;
        });
    };
    ko.applyBindings(_this, $("body").get(0));
    return _this;
}