Question

我试图在knockout中创建一些计算变量。问题是在映射后向子项的子项添加新元素时，我的计算变量不会使用添加到observableArray的新元素进行更新

请帮助你？

这是代码，也附加了一个jsFiddle

由于

var data = {id: 45, Name: "Whatever Name", 
Stages: [{stageID: 1, StageName: "Stage1", Team: [{Name: "Team1", FeesAllocated: 500}, {Name: "Team2", FeesAllocated: 200}]}, {stageID: 1, StageName: "Stage1", Team: []}]};

mappingTeam = function(options){
var teamSelf = options != null ? options : this;
teamSelf.Name = ko.observable(options != null ? options.Name : 0);
teamSelf.FeesAllocated = ko.observable(options != null ? options.FeesAllocated : 0);
return teamSelf;
};

mappingStages = function(options){
    var stageSelf = options != null ? options : this;

  stageSelf.StageID = ko.observable(options != null ? options.StageID : 0);
  stageSelf.StageName = ko.observable(options != null ? options.StageName : 0);
  stageSelf.Team = ko.observableArray(ko.utils.arrayMap(stageSelf.Team, mappingTeam ));


  stageSelf.Length = ko.computed(function(){
        return stageSelf.Team().length;
  });

  //I need this value to be updated, but do nothing with new elements created after the mapping
  stageSelf.TotalStageFees = ko.computed(function(){
        var total = 0;

      ko.utils.arrayForEach(stageSelf.Team(), function (team) {
                total += team.FeesAllocated();
            });
            return total;
  });

  return stageSelf;
};

var mappingOptions = {

        create: function (options) {
            return new function () {
                var self = options.data;

               //Here map Stage Array
                self.Stages = ko.observableArray(ko.utils.arrayMap(self.Stages, mappingStages ));

                ko.mapping.fromJS(self, {}, this);
            };
        }
    };

    //Map my object with child and subchild
    var self = ko.mapping.fromJS(data, mappingOptions);
    console.log(self.Stages()[0].TotalStageFees())
    console.log(self.Stages()[0].Length())

    //Add new TeamMember to first Stage
    self.Stages()[0].Team.push(new mappingTeam({Name: "Team3", FeesAllocated: 50}));

    //As you see, non TotalStageFees or Lenght are updated
    console.log(self.Stages()[0].TotalStageFees())
    console.log(self.Stages()[0].Team())
    console.log(self.Stages()[0].Length())

映射并向observableArray添加新元素后计算var的问题

0 个答案: