Question

我在ASP.NET MVC项目中使用bootstrap dual listbox pluging。
我也在项目中使用Knockout。我正在尝试为此插件创建bindingHandler，以使其在淘汰赛中顺利运行。

这是我试过的东西

绑定处理程序

ko.bindingHandlers.dualList = {
    init: function (element, valueAccessor) {
        $(element).bootstrapDualListbox({
            selectorMinimalHeight: 160
        });

        $(element).on('change', function () {
            $(element).bootstrapDualListbox('refresh', true);
        });

        ko.utils.domNodeDisposal.addDisposeCallback(element, function () {
            $(element).bootstrapDualListbox('destroy');
        });
    },
    update: function (element, valueAccessor) {
        $(element).bootstrapDualListbox('refresh', true);
    }
}

HTML

<select class="form-control" data-bind="foreach:{data: EditedElement().Operations, as : 'op'} , dualList: EditedElement().Operations" multiple>
    <option data-bind="value: op.OperationID(), text: op.Name(), selected: op.IsSelected()"></option>
</select>

查看模型

function SelectOperationVM(operationId, isSelected, name) {
    var self = this;

    self.OperationID = ko.observable(operationId);
    self.IsSelected = ko.observable(isSelected);
    self.Name = ko.observable(name);

    self.copy = function () {
        return new SelectOperationVM(self.OperationID(), self.IsSelected(), self.Name());
    }
}

我的问题我无法在viewModel observableArray和插件之间进行同步。换句话说，我希望插件中的更改（用户删除了一些选项或添加了一些选项）反映在视图模型属性上，反之亦然

Answer 1

要同步，您需要将多个observable传递给自定义绑定

所以你的HTML应该像

<select class="form-control" data-bind="foreach: { data: Operations, as: 'op'}, dualList: { options: Operations, selected: Selected }" multiple>
    <option data-bind="value: op.OperationID(), text: op.Name(), selected: op.IsSelected()"></option>
</select>

和自定义绑定就像

ko.bindingHandlers.dualList = {
  init: function(element, valueAccessor) {
    var data = ko.utils.unwrapObservable(valueAccessor());
    $(element).bootstrapDualListbox({
      selectorMinimalHeight: 160
    });

    $(element).on('change', function() {
      // save selected to an observable  
      data.selected($(element).val());;
    });

    ko.utils.domNodeDisposal.addDisposeCallback(element, function() {
      $(element).bootstrapDualListbox('destroy');
    });
  },
  update: function(element, valueAccessor) {
    // to view if there is an update (without this "update" will not fire)
    var options = ko.utils.unwrapObservable(valueAccessor()).options();
    $(element).bootstrapDualListbox('refresh', true);
  }
}

我也创造了一个肮脏的工作jsfiddle

bootstrap Dual Listbox敲除绑定

1 个答案: