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    <p>I'm marking Derick's answer as accepted as it's cleaner than what I have, but it's not a solution I can use in my case as I have 50+ screens to deal with that I can't break into nice models - I have been given their content and simply have to replicate them.</p> <p>Here's the hacky model code that I came up with which handles screen switching logic. I'm sure I'll end up refactoring it a lot more as I continue working on it.</p> <pre><code>var Wizard = Backbone.Model.extend({ initialize: function(options) { this.set({ pathTaken: [0], // instantiate the screen definitions as screenResponses screenResponses: _(this.screens).map(function(s){ return new s; }) }); }, currentScreenID: function() { return _(this.get('pathTaken')).last(); }, currentScreen: function() { return this.screens[this.currentScreenID()]; }, isFirstScreen: function(screen) { screen = screen || this.currentScreen(); return (_(this.screens).first() === screen); }, // This function should be overridden by wizards that have // multiple possible "finish" screens (depending on path taken) isLastScreen: function(screen) { screen = screen || this.currentScreen(); return (_(this.screens).last() === screen); }, // This function should be overridden by non-trivial wizards // for complex path handling logic nextScreenID: function(currentScreenID, currentScreen) { // default behavior is to return the next screen ID in the list return currentScreenID + 1; }, nextScreen: function() { // return immediately if on final screen if (this.isLastScreen()) return; // otherwise get next screen id from nextScreenID function nsid = this.nextScreenID(this.currentScreenID(), this.currentScreen()); if (nsid) { this.get('pathTaken').push(nsid); return nsid; } }, prevScreen: function() { // return immediately if on first screen if (this.isFirstScreen()) return; // otherwise return the previous screen in the list prevScreenID = _(_(this.get('pathTaken')).pop()).last(); return this.screens[prevScreenID]; } }); var ChocolateWizard = Wizard.extend({ initialize: function(options) { Wizard.prototype.initialize.call(this); // super() this.set({ wizardType: 'Chocolate', }); }, nextScreenID: function(csid, cs) { var resp = this.screenResponses(csid); this.nextScreenController.setState(csid.toString()); // have to manually change states if (resp.nextScreenID) // if screen defines a custom nextScreenID method, use it return resp.nextScreenID(resp, this.get('screenResponses')); else // otherwise return next screen number by default return csid + 1; }, // convenience function screenResponses: function(i) { return this.get('screenResponses')[i]; }, screens: [ // 0 Backbone.Model.extend({ title : "Chocolate quiz", schema: { name: 'Text', likesChocolate: { title: 'Do you like chocolate?', type: 'Radio', options: ['Yes', 'No'] } }, nextScreenID: function(thisResp, allResp) { if (thisResp.get('likesChocolate') === 'Yes') return 1; else return 2; } }), // 1 Backbone.Model.extend({ title : "I'm glad you like chocolate!", schema: { chocolateTypePreference: { title: 'Which type do you prefer?', type: 'Radio', options: [ 'Milk chocolate', 'Dark chocolate' ] } }, nextScreenID: function(thisResp, allResp) { return 3; // skip screen 2 } }), // 2 Backbone.Model.extend({ title : "So you don't like chocolate.", schema: { otherSweet: { title: 'What type of sweet do you prefer then?', type: 'Text' } } }), // 3 Backbone.Model.extend({ title : "Finished - thanks for taking the quiz!" } ] }); </code></pre>
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