Question

我有以下主视图模型

var masterVM = (function() {
  this.PatientViewModel = ko.mapping.fromJS(new PatientViewModel());
  this.MedicalBenefit = new MedicalBenefitViewModel(this.PatientViewModel);
})();

以及以下视图模型

var PatientViewModel = function() {
  var self = this;

  self.FirstName = ko.observable();
  self.LastName = ko.observable();
  self.NationalHealthFundId = ko.mapping.fromJS(null);

  self.NationalHealthFundId.subscribe(function(newValue) {
    alert("subscribe from patient");
  });
};

var MedicalBenefitViewModel = function (patient) {
    var self = this;

    self.patient = patient;
};

和自定义绑定中的某个地方（绑定到患者）：

...

var observable = valueAccessor();

ko.mapping.fromJS(patient, {}, observable);

...

患者是代表患者的简单普通json对象。

自定义绑定执行后，订阅（警报（＆＃34;从患者订阅＆＃34;）;）停止工作，为什么？

Answer 1

您已设置self.NationalHealthFundId = ko.mapping.fromJS(null);。您只能订阅一个可观察者。例如，这有效：

＆＃13;

var PatientViewModel = function() {
  var self = this;

  self.FirstName = ko.observable();
  self.LastName = ko.observable();
  self.NationalHealthFundId = ko.observable();

  self.NationalHealthFundId.subscribe(function(newValue) {
    alert("subscribe from patient");
  });
};

var vm = new PatientViewModel()
ko.applyBindings(vm);

vm.NationalHealthFundId(1);
vm.NationalHealthFundId(2);

＆＃13;

<script src="https://cdnjs.cloudflare.com/ajax/libs/knockout/3.4.2/knockout-min.js"></script>

＆＃13;

Knockout viewmodel mapping停止订阅触发

1 个答案: