使用 jquery.dataTables 从 observableArray 中删除项目后 UI 不更新

Question

我正在使用jquery.dataTables 和knockout js 将数据绑定到表。

从observableArray 中删除项目后，UI 不会更新。因为我将数据绑定到jquery.Datatable，所以可以重新初始化表；所以我通过调用TableManaged.init(); 方法重新初始化表，但它正在生成警告cannot reinitialise datatable。

下面是我的代码。

function PatientVM(vm) {
  self.MDSPatientId = ko.observable(vm.MDSPatientId());
  self.PatientNumber = ko.observable(vm.PatientNumber());
  self.PrescribingDay = ko.observable(vm.PrescribingDay());
  self.OneWeekItems = ko.observable(vm.OneWeekItems());
  self.DeliveryDay = ko.observable(vm.DeliveryDay());
  self.IsActive = ko.observable(vm.IsActive());
  self.WeekColor = ko.observable(vm.WeekColor());
  self.PatientName = ko.observable(vm.PatientName());
  self.FullAddress = ko.observable(vm.FullAddress());
}

function Patients(vm) {
  var self = this;
  self.PatientList = ko.observableArray();

  if (vm.PatientList() != null) {
    for (i = 0; i < vm.PatientList().length; i++) {
      var p = new PatientVM(vm.PatientList()[i]);
      self.PatientList.push(p);
    }
  }

  self.DeletePatient = function(patient) {
    var result = confirm("Want to delete?");
    if (result) {
      $.ajax({
        url: '@Url.Action("DeleteMDSPatient", "Patient")',
        cache: false,
        type: 'GET',
        contentType: "application/json; charset=utf-8",
        dataType: "json",
        data: {
          'MDSPatientId': patient.MDSPatientId()
        },
        success: function(response) {
          if (response.Result == 3) {
            self.PatientList.remove(patient);
            ShowToastMessage("Patient has been deleted successfully", "Success", true);
          }
        },
        error: function(errorThrown) {}
      });
    }
  }
}

$(document).ready(function() {
  ko.applyBindings(new Patients(ko.mapping.fromJS(@Html.Raw(JsonConvert.SerializeObject(Model)))));
  App.init();
  TableManaged.init();
});

<table class="table table-striped table-bordered table-hover" id="sample_3" style="line-height:22px;table-layout:fixed;overflow-x:hidden;">
  <thead>
    <tr style="background-color:#348fe2">
      <th style="width:5%;text-align:center">
        <span class="showellipses">Active Patient</span>
      </th>
      <th style="width:10%"><span>Name</span>
      </th>
      <th style="width:20%"><span class="showellipses">Address</span>
      </th>
      <th style="width:10%"><span class="showellipses">PrescribingDay</span>
      </th>
      <th style="width:5%"><span class="showellipses">No. of items in four week</span>
      </th>
      <th style="width:10%"><span class="showellipses">Assembly Week</span>
      </th>
      <th style="width:10%"><span>Delivery Day</span>
      </th>
      <th style="width:5%">Action</th>
    </tr>
  </thead>
  <tbody data-bind="foreach:PatientList">
    <tr class="odd gradeX">
      <td style="text-align:center">
        <input type="checkbox" data-bind="checked:IsActive, click:ChangePatientStatus" class="checkboxes" />
      </td>
      <td>
        <span class="showellipses" data-bind="text:PatientName"></span>
      </td>
      <td>
        <span class="showellipses" data-bind="text:FullAddress"></span>
      </td>
      <td>
        <span data-bind="text:PrescribingDay"></span>
      </td>
      <td class="center">
        <span data-bind="text:OneWeekItems"></span>
      </td>
      <td>
        <span data-bind="text:WeekColor"></span>
      </td>
      <td>
        <span data-bind="text:DeliveryDay"></span>
      </td>
      <td>
        <a title="Edit" style="text-decoration:none" class="fa fa-edit" data-bind="attr: { 'href': '@Url.Action(" PatientView ", "Patient ")?MDSPatientId=' + MDSPatientId()}"></a>&nbsp;|
        <a title="Delete" style="text-decoration:none" class="fa fa-trash-o" data-bind="click:$parent.DeletePatient"></a>
      </td>
    </tr>
  </tbody>
</table>

Answer 1

这是他们的文档link 中的一个示例。

您需要一个额外的步骤来通知 jquery 插件更新表。 基本上，您需要订阅数组更改并使删除的行无效。 他们建议使用帮助器来订阅 observable 数组，如下所示：

// Helper function so we know what has changed
// http://stackoverflow.com/questions/12166982
ko.observableArray.fn.subscribeArrayChanged = function(addCallback, deleteCallback) {
    var previousValue = undefined;
    this.subscribe(function(_previousValue) {
        previousValue = _previousValue.slice(0);
    }, undefined, 'beforeChange');
    this.subscribe(function(latestValue) {
        var editScript = ko.utils.compareArrays(previousValue, latestValue);
        for (var i = 0, j = editScript.length; i < j; i++) {
            switch (editScript[i].status) {
                case "retained":
                    break;
                case "deleted":
                    if (deleteCallback)
                        deleteCallback(editScript[i].value);
                    break;
                case "added":
                    if (addCallback)
                        addCallback(editScript[i].value);
                    break;
            }
        }
        previousValue = undefined;
    });
};

然后您需要订阅并响应数组更改：

self.PatientList.subscribeArrayChanged(
        function ( addedItem ) {
            dt.row.add( addedItem ).draw();
        },
        function ( deletedItem ) {
            var rowIdx = dt.column( 0 ).data().indexOf( deletedItem.id );
            dt.row( rowIdx ).remove().draw();
        }
    );

这是带有完整示例的plunk。