修改可观察数组时如何触发函数

Question

is it possible to fire a function when observable array is modified? my goal here is to notify me if my observable array is modified to do some logics on my current application

this is my view model it has a observable array inside it

WT.BM.BarsViewModel = function () {
    var self = this;
    self.BarsDataHolder = ko.observableArray([]);
};

i just want to fire a function to notify me if self.BarsDataHolder has been modified

any ideas?

Answer 1

You can subscribe to any ko.observable or ko.observable array.

WT.BM.BarsViewModel.BarsDataHolder.subscribe(function(newArray) {
   console.dir(newArray);
});

you can find this in the knockout documentation on the observables page