javascript - Calling function from within Knockout Observable Array -

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i have knockout observable array wish edit within javascript , html well. here code:

var listmodel = function(formula) {   var self = this;   self.formula = ko.observablearray(formula);    this.mergeequation = function(op) {     if (op.type == "ins") {       self.formula.splice(op.position, 0, op.value);     } else if (op.type == "del") {       self.formula.splice(op.position, 1);     } else {       console.info("no match: " + op.value + op.position);     }   }; };

my variable op json string. know how call mergeequation function using html data-bind, how do within same js file? current code goes this: 

ko.applybindings(new listmodel(formula)); //... //initializing of json object called op //... if (something) {   mergeequation(op); }

but doesn't work. missing out step here? i've read on functions , extenders both seems overkill i'm trying here.

ps: here's sample of json structure i'm working with:

{"type":"ins", "clientid":1223, "version":0, "value":"hi", "position":0, "id":2736}

change :-

ko.applybindings(new listmodel(formula));

to 

  var vm = new listmodel(formula);    ko.applybindings(vm);

so, vm thing can call mergeequation on

vm.mergeequation(op)

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