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POEmber.js Controller & View Binding (The ember.js way...)
 

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    <p><em>I apologize for the length of this question but I lack the insight to make it short.</em></p> <p>I am trying to learn Ember.js &amp; I am having a little trouble understanding the relationship between a controller it's view. Particularly as it relates to controller property &amp; view bindings. I have a bit of an application that <em>works</em>... But I don't really understand why &amp; I feel that <em>(rather obviously)</em> this is not the 'Ember.js' way to do it. </p> <p>Some things to consider: This application is broken out into directory/files according to what I have interpreted in the guides/documentation to be the 'correct' structure, This application is running in the context of a sinatra application. This application, although incomplete, does work the way I expect it to so far.</p> <p>The application is incomplete but here is a general overview of what I expect &amp; what I am trying to do:</p> <p>1) A user arrives at the root URL '/' and is transitioned to the '/locate' URL.</p> <p>2) The LocateController grabs the users location, populates two form fields with the lat/lng.</p> <p>3) The form is submitted to the server as POST to the sinatra '/locate' route as ajax.</p> <p><em>(request is processed by server)</em></p> <p>4) User is transitioned to the ember.js '#/located' route.</p> <p>5) Information comes back from the server as a JSON object &amp; displayed</p> <p><em>I have thus far only implemented step one. The form could be sent if I added a submit button but the idea is to have it happen automatically.</em> </p> <p><strong>The fields in the locate view are populated with the correct values for the form fields. However, I am using straight jQuery to update the values and that to me seems like it is not the 'correct' way to do this in an ember.js app</strong></p> <p>Here follows some of my code. For the sake of brevity I will just provide snippets as I feel like if you know the right answer you will be able to derive it from the provided excerpts.</p> <p>My views are set up like this: <em>I use slim in my sinatra app</em></p> <pre><code>script type="text/x-handlebars" data-template-name="application" | {{ outlet }} script type="text/x-handlebars" data-template-name="locate" | {{ message }} | &lt;form id="coordinates"&gt; | {{view Ember.TextField id="latitude" name="latitude" valueBinding="latitude" class="latitude"}} | {{view Ember.TextField id="longitude" name="longitude" valueBinding="longitude" class="longitude"}} | &lt;/form&gt; script type="text/x-handlebars" data-template-name="located" | &lt;p id="message"&gt;{{ message }}&lt;/p&gt; | &lt;p id="latitude"&gt;{{ latitude }}&lt;/p&gt; | &lt;p id="longitude"&gt;{{ longitude }}&lt;/p&gt; </code></pre> <p>script src="assets/js/app/application.js"</p> <p>applicationView.js</p> <pre><code>Application.ApplicationView = Ember.View.extend({ templateName: 'application' }); Application.LocateView = ApplicationView.extend({ templateName: 'locate' }); Application.LocatedView = ApplicationView.extend({ templateName: 'located' }); </code></pre> <p>applicationController.js</p> <pre><code>var GeoLocation; GeoLocation = (function(location){ $('#latitude').val(location.coords.latitude), $('#longitude').val(location.coords.longitude) }); navigator.geolocation.getCurrentPosition(GeoLocation) Application.ApplicationController = Ember.Controller.extend({ message: "Hello from Application" }); Application.LocateController = Ember.Controller.extend({ message: "Hello from Locate", latitude: "-- lat --", longitude: "-- lng --", }); Application.LocatedController = Ember.Controller.extend({ message: "Hello from Located", latitude: "-- lat --", longitude: "-- lng --", }); </code></pre> <p>router.js</p> <pre><code>Application.Router.map(function() { this.route('index'); this.route('locate'); this.route('located'); }); Application.ApplicationRoute = Ember.Route.extend({ events: { goToLocate: function() { this.transitionTo('locate'); }, goToLocated: function() { this.transitionTo('located'); } } }); Application.IndexRoute = Ember.Route.extend({ redirect: function() { this.render('application'); this.transitionTo('locate'); } }); Application.LocateRoute = Ember.Route.extend({ redirect: function() { this.render('locate'); //this.transitionTo('located'); } }); }); Application.LocatedRoute = Ember.Route.extend({ renderTemplate: function(controller) { this.render('located'); } }); </code></pre> <p>I have read the Guides &amp; The API Documentation on the ember.js website as well as looked at the repo on GitHub. I feel like the 'correct' implementation would use computed properties for the latitude &amp; longitude attributes but I don't quite understand how that works in practice. </p> <p>Also, I know that there is most likely a better way to deal with getting the information to the server (perhaps as JSON or ember-data when I get that far?), and feel free to share any insights you may have regarding that. But for now however, as I am comfortable with sinatra and how it works I would prefer a solution that does not require major refactoring of my backend yet. (that is to say, being able to access the location data from sinatra's params[:hash]).</p> <p>Thanks in advance for your help &amp; taking the time to read this rather long question.</p>
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