KnockoutJS subscribe to multiple observables with same callback action

Question

I\'ve got a model class in KnockoutJS which has multiple values that I\'d like to subscribe to. Each subscription will perform the same task, like so:

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Answer 1

You can use a computed observable for this purpose. You just need to make sure that you access the value of each observable in the read function. Would be something like:

ko.computed(function() {
   self.zipCode();
   self.userId();
   self.isUpdated = true;
});

So, you get dependencies on the two observables and set your flag.

Also, if you are looking for something like a "dirty" flag, then you might consider something like: http://www.knockmeout.net/2011/05/creating-smart-dirty-flag-in-knockoutjs.html. The idea is that you use a computed observable that calls ko.toJS() on an object to unwrap all of its observables.