Generate a visualization following the inclusion of a fresh model

I have a few pre-existing models on a server that are successfully fetched and rendered. However, when I save a new model, it doesn't get rendered until the page is refreshed. Is there a way to render the new model without reloading the page?

Below is my ListView code:

var GroupView = Backbone.View.extend({
    tagName: 'ul',

    initialize: function () {
        this.collection = new StudentsCollection();
       
        this.collection.on('update', this.render, this);
        
        this.collection.fetch({
            success: function () {
                console.log('success!');
            },
            error: function (collection, response, options) {
                console.log(options);
            }
        });
    },

    render: function () {
        var self = this;

        this.collection.each(function (student) {
            var studentView = new StudentView({
                model: student
            });
            self.$el.append(studentView.render().el);
        });
        $('.container').append(this.$el);
    }
});

I've tried using the 'add' event on the collection but it ends up duplicating everything. Any suggestions?

Answer №1

Utilizing the add method on a collection is the ideal approach, especially when you want to execute certain actions when a model is added. The reason for experiencing duplicates of everything (with the exception of the most recent addition) is likely due to your render function simply appending to the $el.

It's worth noting that Backbone does not automatically clear out your current view before rendering new content; this decision rests with you and your preferred strategy.

A straightforward solution involves adding this.$el.empty() at the beginning of your render function. However, I would caution against this as it will trigger a complete re-render each time a model is added.

A more effective approach would be to create a dedicated function responsible for adding individual views to the existing one and triggering it upon an add event.

You could implement something similar to the following:

initialize: function() {
    ...
    this.collection.on('add', this.addStudentView, this);
    ...
}

and

addStudentView: function(model) {
    var studentView = new StudentView({
        model: model
    });
    this.$el.append(studentView.render().el);
}

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