CODEWITHSUNDEEP
knockout.jsknockout-2.0knockout-3.0
ralic
ralic

Reputation: 75

Knockout calls subscribe function before rendering the view

Knockout is calling subscribe function before rendering the view even without beforechange attribute, when used with arrayChange param.

I have created JSfiddle because StackOverflow ignores debugger; keyword in JavaScript code, and that is the easiest way to see this behavior. JSfiddle

Is there any way to signal KnockOut to call subscribe function after render?

I need to do this with subscribe, it is used by a custom bind and can not be invoked by afterRender or similar view handling functions.

Upvotes: 0

Views: 631

Answers (1)

evbailey
evbailey

Reputation: 371

You could expose a method on your view model to create the subscription, then call it on the vm after calling ko.applyBindings:

function ViewModel(){
    var self = this;

    this.items = ko.observableArray([]);
    this.push = function(){
      self.items.push((Math.random(10)*10).toFixed(0));
      console.log("PUSH");
    }

    this.subscribeAfterApply = function(){
      this.items.subscribe(changes=>{
        console.log("SUBSCRIPTION FIRED");
      }, null, "arrayChange");
      console.log("SUBSCRIBED");
    }
}

var vm = new ViewModel();

ko.applyBindings(vm);
vm.subscribeAfterApply();

Upvotes: 1

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