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POLinked jQuery sortable lists and Backbone collections
 

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    <p>I'm still finding my way with Backbone and I've always use Prototype instead of jQuery in the past so please forgive me if I'm doing something stupid.</p> <p>I'm trying to develop a UI containing several connected unordered lists where each <code>sortable</code> list is represented by a separate Backbone collection. I'm using ICanHaz and Mustache templates but that's not of importance for my question.</p> <p>When dragging items between the lists, how would I best achieve the automatic updating of the collections (remove a model from one and insert it into another)? I'm currently trying to use the receive and remove methods in the jQueryUI Sortable interaction — am I at least on the right lines?</p> <pre><code>var WS = {}; (function(ns) { ns.Item = Backbone.Model.extend(); ns.Content = Backbone.Collection.extend({ model: ns.Item, url: location.href, initialize: function(el) { this.el = $(el); this.deferred = this.fetch(); }, recalculate: function() { var count = this.length; this.el.next(".subtotal").html(count); }, setOrder: function() { $.ajax({ url: this.url + "/reorder", type: "POST", data: "tasks=" + $(this.el).attr("id") + "&amp;" + this.el.sortable("serialize") }); } }); ns.ContentRow = Backbone.View.extend({ tagName: "li", className: "item", events: { "click .delete": "destroy" }, initialize: function(options) { _.bindAll(this, "render", "destroy"); this.model.bind("change", this.render); this.model.view = this; }, render: function() { var row = ich.item(this.model.toJSON()); $(this.el).html(row); return this; }, destroy: function() { if (confirm("Really delete?")) { this.model.destroy({ success: function(model, response) { $(model.view.el).remove(); }, error: function(model, response) { console.log(response); } }); } } }); ns.ListView = Backbone.View.extend({ initialize: function(collection) { this.el = collection.el; this.collection = collection; this.collection.bind("add", this.addOne, this); _.bindAll(this, "addOne"); this.el.sortable({ axis: "y", connectWith: ".tasks", receive: _.bind(function(event, ui) { // do something here? }, this), remove: _.bind(function(event, ui) { // do something here? }, this), update: _.bind(function(event, ui) { var list = ui.item.context.parentNode; this.collection.setOrder(); }, this) }); }, insert: function(item) { var prefix = this.el.parentsUntil('ul').parent().attr("id"), view = new ns.ContentRow({ model: item, id: prefix + "_" + item.id }); this.el.append(view.render().el); }, addOne: function(item) { if (item.isNew()) { item.save({}, { success: _.bind(function(model, response) { // I should set id from JSON response when live model.set({ id: this.collection.length }); this.insert(model); }, this) }); } else { this.insert(item); } }, addAll: function() { this.collection.each(this.addOne); }, render: function() { this.collection.deferred.done(_.bind(function() { this.addAll(); }, this)); } }); ns.AppView = Backbone.View.extend({ lists: [], initialize: function(holder) { holder.find("ul").each(_.bind(function(index, list) { var Items = new WS.Content(list), App = new WS.ListView(Items); App.render(); this.lists.push(Items); }, this)); } }); })(WS); $(document).ready(function() { var App = new WS.AppView($("#tasks")); }); </code></pre>
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