What is the best way to trigger events upward in a Backbone View hierarchy?

Question

What is the best way to trigger events upward in a Backbone View hierarchy?

Running a backbone app with a structured view system, here's a simplified version of how it looks:

NewsListView = Backbone.View.extend({

    el: $('li#newspane'),

    initialize: function() {
        _.bindAll(this);
    },

    render: function() {
    },

    reset: function(){
    }

});

FilterView = Backbone.View.extend({

    el: $('li.filter'),

    initialize: function() {
    },

    render: function() {
    },

    toggleFilter: function() {
    }

});

AllView = Backbone.View.extend({

    initialize: function() {

        this.newsListView = new NewsListView();
        this.filterView = new FilterView();

    }

});

In essence, when the toggleFilter() function in FilterView is activated, I want to trigger an event named filtered which can then be captured by NewsListView, leading to its reset() function being called. I'm unsure how to achieve this without directly passing a NewsListView object reference to FilterView. Any suggestions?

javascript event-handling backbone.js

Answer 1

Answer №1

You're definitely heading in the right direction. It seems like what you could benefit from is implementing a global event dispatcher. I came across a helpful article and example that you might find useful:

Answer 2

You're definitely heading in the right direction. It seems like what you could benefit from is implementing a global event dispatcher. I came across a helpful article and example that you might find useful:

Answer 3

Answer №2

One way to achieve this functionality is by leveraging the power of jQuery events and the backbone events property.

Instead of triggering an event from inside a subview like this:

this.trigger("yourevent", this);

You can trigger the event like this:

this.$el.trigger("yourevent", this);

Then, in any parent, grandparent, or higher level view, you can listen for the event by specifying it in the events object of that view:

events:{
    "yourevent":"yourhandler"
}

Make sure to define the handler in that view as well:

yourhandler:function(subview) {
}

This way, a view only needs to know the type of event it is interested in, not the specific descendant views. If the view that triggered the event is destroyed, there is no need to make any changes to the ancestor view. Backbone will automatically detach the handlers if the ancestor view is destroyed.

Keep in mind though, I have not tested this approach yet, so there could be potential pitfalls to watch out for.

Answer 4

One way to achieve this functionality is by leveraging the power of jQuery events and the backbone events property.

Instead of triggering an event from inside a subview like this:

this.trigger("yourevent", this);

You can trigger the event like this:

this.$el.trigger("yourevent", this);

Then, in any parent, grandparent, or higher level view, you can listen for the event by specifying it in the events object of that view:

events:{
    "yourevent":"yourhandler"
}

Make sure to define the handler in that view as well:

yourhandler:function(subview) {
}

This way, a view only needs to know the type of event it is interested in, not the specific descendant views. If the view that triggered the event is destroyed, there is no need to make any changes to the ancestor view. Backbone will automatically detach the handlers if the ancestor view is destroyed.

Keep in mind though, I have not tested this approach yet, so there could be potential pitfalls to watch out for.

Answer 5

Answer №3

If you're looking for a great way to handle bubbling events, I recommend exploring the Backbone.Courier plugin. It's designed for that very purpose:

https://github.com/dgbeck/backbone.courier

Answer 6

If you're looking for a great way to handle bubbling events, I recommend exploring the Backbone.Courier plugin. It's designed for that very purpose:

https://github.com/dgbeck/backbone.courier

Answer 7

Answer №4

A convenient method I've discovered for triggering and monitoring events is simply utilizing the Backbone object itself. It comes equipped with the necessary event functions, allowing you to easily trigger like so:

Backbone.trigger('view:eventname',{extra_thing:whatever, thing2:whatever2});

Subsequently, within any other backbone view in your application, you can observe this event like this:

Backbone.on('view:eventname', function(passed_obj) {
    console.log(passed_obj.extra_thing);
});

I'm uncertain of the advantage of not utilizing the Backbone object as your event handler and opting to create a separate object for this purpose. However, for quick and temporary solutions, the aforementioned method suffices. Hope this helps!

It is worth noting that a drawback to this approach is that each listener will catch every single event triggered in this manner. The scalability of this could be a concern, so exercise caution to prevent overloading your views with excessive event handling. Once again, this is intended for quick and temporary use! :)

Answer 8

A convenient method I've discovered for triggering and monitoring events is simply utilizing the Backbone object itself. It comes equipped with the necessary event functions, allowing you to easily trigger like so:

Backbone.trigger('view:eventname',{extra_thing:whatever, thing2:whatever2});

Subsequently, within any other backbone view in your application, you can observe this event like this:

Backbone.on('view:eventname', function(passed_obj) {
    console.log(passed_obj.extra_thing);
});

I'm uncertain of the advantage of not utilizing the Backbone object as your event handler and opting to create a separate object for this purpose. However, for quick and temporary solutions, the aforementioned method suffices. Hope this helps!

It is worth noting that a drawback to this approach is that each listener will catch every single event triggered in this manner. The scalability of this could be a concern, so exercise caution to prevent overloading your views with excessive event handling. Once again, this is intended for quick and temporary use! :)

Answer 9

Answer №5

To overcome this issue, a clever backbone.js workaround can be implemented. By making a slight tweak to Backbone.Events.trigger, events can be seamlessly transferred to the this.parent

if this.parent !== undefined

Answer 10

To overcome this issue, a clever backbone.js workaround can be implemented. By making a slight tweak to Backbone.Events.trigger, events can be seamlessly transferred to the this.parent

if this.parent !== undefined

Answer 11

Answer №6

After encountering a problem, my solution was to devise an object that extends Backbone.Events, then pass it as a parameter to various views. This method almost resembles message passing between actors, which is quite intriguing. While I am sharing this as a potential solution, I am hesitant to fully endorse it. It feels somewhat like a hack, and I am still eager to explore a more refined approach.

NewsListView = Backbone.View.extend({
    el: $('li#newspane'),

    // Unfortunately, this direct approach does not function as intended
    // events: { 'filtered': 'reset' }

    initialize: function() {
        _.bindAll(this);
        // However, this alternative method does work
        this.options.eventProxy.bind('filtered', this.reset);
    },
    render: function() {},
    reset: function() {}
});

FilterView = Backbone.View.extend({
    el: $('li.filter'),

    initialize: function() {},
    render: function() {},
    toggleFilter: function() {
        this.options.eventProxy.trigger('filtered');
    }
});

AllView = Backbone.View.extend({
    initialize: function() {
        var eventProxy = {};
        _.extend(eventProxy, Backbone.Events);
        this.newsListView = new NewsListView({eventProxy: eventProxy});
        this.filterView = new FilterView({eventProxy: eventProxy});
    }
});

Answer 12

After encountering a problem, my solution was to devise an object that extends Backbone.Events, then pass it as a parameter to various views. This method almost resembles message passing between actors, which is quite intriguing. While I am sharing this as a potential solution, I am hesitant to fully endorse it. It feels somewhat like a hack, and I am still eager to explore a more refined approach.

NewsListView = Backbone.View.extend({
    el: $('li#newspane'),

    // Unfortunately, this direct approach does not function as intended
    // events: { 'filtered': 'reset' }

    initialize: function() {
        _.bindAll(this);
        // However, this alternative method does work
        this.options.eventProxy.bind('filtered', this.reset);
    },
    render: function() {},
    reset: function() {}
});

FilterView = Backbone.View.extend({
    el: $('li.filter'),

    initialize: function() {},
    render: function() {},
    toggleFilter: function() {
        this.options.eventProxy.trigger('filtered');
    }
});

AllView = Backbone.View.extend({
    initialize: function() {
        var eventProxy = {};
        _.extend(eventProxy, Backbone.Events);
        this.newsListView = new NewsListView({eventProxy: eventProxy});
        this.filterView = new FilterView({eventProxy: eventProxy});
    }
});

What is the best way to trigger events upward in a Backbone View hierarchy?

Answer №1

Answer №2

Answer №3

Answer №4

Answer №5

Answer №6

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