How to track where the model changes from in backbone.js?

Question

JavaScript

An event hangs on the View that tracks a change in the model, or rather one of the fields of the model. When this field is changed, the event occurs, but not once, as we would like, but twice. How can you track the moment at which this field changes again?
Listener code:

updateCallState: function () {
                    var call_state = this.model.get('call_state');

                    if (call_state == "call in progress") {
                        this.startDate = new Date();
                        this.started = true;
                        this.startTime();
                    } else if (call_state == "disconnected") {
                        this.started = false;
                        this.saveMessage();
                        this.$el.remove();

                        return;
                    } else {
                        this.$el.find('.call_state').html(call_state);
                    }

                    this.render();
                },

Answer 1

Set a breakpoint and see the stack: https://developer.chrome.com/devtools/docs/javascr...