backbone_partial_render.js

/**
 * Renders part of the view instead all of it.
 * Useful in sutuations where view contains counter and input fields.
 * Counter needs to be updated, while input state left intact.
 * */
Backbone.View.prototype.renderPartial = function(selector, data, template) {
    template = template || this.template;
    var self = this;
    var $html = $('<div>' + template(data) + '</div>');

    selector.split(',').forEach(function(q) {
      q = q.trim();
      self.$(q).replaceWith($html.find(q));
    });
    return this;
};