Develop Reference

Child outlet goes empty when I refresh the url with id from {{link-to}} in Emberjs

I have a weird issue, the child outlet goes empty whenever I will refresh the page with the id. I have a list generated by {{link-to}} helper.
<script type="text/x-handlebars" id="twod">
<div class="row">
<div class="span4">
<img src="/img/2DPipeline.jpg" />
</div>
<div class="span3">
<h4>People with Roles</h4>
<div class="row">
<div class="span2">
<ul>
{{#each item in model}}
<li>{{#link-to 'twoduser' item}}{{item.firstname}} {{/link-to}}</li>
{{/each}}
</ul>
</div>
<div class="row">
<div class="span">
{{outlet}}
</div>
</div>
</div>
</div>
</script>
Here's the twoduser template,
<script type="text/x-handlebars" data-template-name="twoduser">
<div class="row">
<div class="span3">
Full Name: {{firstname}}{{lastname}}
EMail: {{email}}
</div>
</div>
</script>
App.js,
App.Router.map(function() {
this.resource('twod', function() {
this.resource('twoduser', {
path : ':user_id'
});
});
this.resource('threed');
});
App.TwoduserRoute = Ember.Route.extend({
model : function(params) {
return App.Twod.findBy(params.user_id);
}
});
App.Twod.reopenClass({
findAll : function() {
return new Ember.RSVP.Promise(function(resolve, reject) {
$.getJSON("http://pioneerdev.us/users/index", function(data) {
var result = data.users.map(function(row) {
return App.Twod.create(row);
});
resolve(result);
}).fail(reject);
});
},
findBy : function(user_id) {
var user = App.Twod.create();
$.getJSON("http://ankur.local/users/byId/" + user_id, function(data) {
user.setProperties(data.user);
});
user.set("user_id", user_id);
return user;
}
});
App.TwodRoute = Ember.Route.extend({
model : function() {
return App.Twod.findAll();
}
});
Selecting each one individually works fine and fills the child outlet, but when I refresh it, it goes blank.
Any ideas what might be causing the issue?

I can see two possible problems.
The first is that your URLs are different between findAll and findBy. Was that intentional?
The second is that findAll returns an Ember promise (Ember.RSVP.Promise), but findBy does not.
[UPDATE] : Based on the JSBin in the comments : http://jsbin.com/iPUxuJU/1/
The problem here is that the API endpoint is returning an array in the user response. It currently looks like this:
{user : [{ ... }] }
Ideally it would look like this :
{user : {....} }
You could change the API endpoint, or you could update your code to pull the first element from that array. Instead of :
user.setProperties(data.user);
You could do :
user.setProperties(data.user[0]);
Here's an altered JSBin : http://jsbin.com/oquBoMA/1#/twod/2

Loading a single model with Ember.js

I'm trying to write a pretty simple app: I have some games (say chess, tictactoe... whatever), and there are several boards of each game. I want to show a list of games, and then show a list of boards when you click on a game.
But I'm facing a lot of problems. I'll first describe them, and I'll paste the code after that:
The list of games is correctly shown. No problem here.
When I click a game, I get this error:
Uncaught Error: assertion failed: an Ember.CollectionView's content must implement Ember.Array. You passed <(generated game controller):ember237>
BUT if I press F5 or write the URL manually, everything works fine. And I have no idea why.
UPDATE: I've seen that if I change the games template, changing the {{#linkTo}} with a hand-written link, everything works OK:
This is the non-working linkTo: {{#linkTo 'game' game}}{{game.name}}{{/linkTo}}. It builds the URL correctly, but it fails when I click on it.
This is a hand-written <a> tag: {{game.name}}. It works perfectly.
The Url of each board should follow this format:
/games/1/boards/5
But when I write the {{#linkTo 'board' board}} what I get is:
/games/undefined/boards/5
Here is the code (You can see a "working" copy here in JBin. But it's not functional, because it relays on a local REST app):
The Router:
MGames.Router.map(function () {
this.resource('games', function () {
this.resource ('game', {path: '/:game_id'}, function () {
this.resource('board', {path: '/boards/:board_id'});
});
});
});
MGames.IndexRoute = Ember.Route.extend({
redirect: function () {
this.transitionTo('games');
}
});
MGames.GamesRoute = Ember.Route.extend ({
model: function() {
return MGames.Game.findAll();
}
});
MGames.GameRoute = Ember.Route.extend ({
model: function(params) {
return MGames.Board.findAllByGame(params.game_id);
}
});
MGames.BoardsRoute = Ember.Route.extend ({
model: function(params) {
return this.modelFor('game').then(
function (game) {
return MGames.Board.find(game.get('id'), params.board_id);
}
);
}
});
The models:
MGames.Game = Ember.Object.extend({
id: null,
name: null,
icon: null
});
MGames.Game.reopenClass({
findAll: function() {
var url = [MGames.GAMES_API_URL];
url.push ('games');
url = url.join('/');
var result = Ember.ArrayProxy.create({ content: [] });
$.getJSON(url).then (
function (response) {
response.forEach(function (child) {
result.pushObject (MGames.Game.create(child));
});
}
);
return result;
},
find: function (id) {
var url = [MGames.GAMES_API_URL];
url.push ('games');
url.push (id);
url = url.join('/');
var game = MGames.Game.create({ isLoaded: false });
$.getJSON(url).then (
function(response) {
game.setProperties(response);
game.set('isLoaded', true);
}
);
return game;
}
});
MGames.Board = Ember.Object.extend({
id: null,
name: null,
owner: null,
game: null,
is_public: null,
created_at: null
});
MGames.Board.reopenClass({
findAllByGame: function (game) {
var url = [MGames.GAMES_API_URL];
url.push ('games');
url.push (game);
url.push ('boards');
url = url.join('/');
var result = Ember.ArrayProxy.create({ content: [] });
$.getJSON(url).then (
function (response) {
console.log (response);
response.forEach(function (child) {
result.pushObject (MGames.Board.create(child));
});
}
);
return result;
},
find: function (game, board) {
url = [MGames.GAMES_API_URL];
url.push ('games');
url.push (game);
url.push ('boards');
url.push (board);
url = url.join('/');
var result = MGames.Board.create();
$.getJSON(url).then (
function(response) {
result.setProperties(response);
}
);
return result;
}
});
And the template:
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>MGames</title>
<link rel="stylesheet" href="css/bootstrap.css">
<link rel="stylesheet" href="css/main.css">
</head>
<body>
<script type="text/x-handlebars">
<div class="navbar navbar-fixed-top">
<div class="navbar-inner">
<div class="container">
<div class="nav-collapse collapse">
<ul class="nav">
<li class="active">{{#linkTo 'index' class="brand"}}MGames{{/linkTo}}</li>
</ul>
</div>
</div>
</div>
</div>
<div class="container">
{{outlet}}
</div>
</script>
<script type="text/x-handlebars" id="games">
<div class="row">
<header id="header">
<h1>Games</h1>
</header>
<ul>
{{#each game in controller}}
<li>
{{#linkTo 'game' game}}{{game.name}}{{/linkTo}}
</li>
{{/each}}
</ul>
{{outlet}}
</div>
</script>
<script type="text/x-handlebars" id="game">
<div class="row">
<div class="span3" id="boards">
<header id="header">
<h1>Boards</h1>
</header>
<ul id="board-list">
{{#each board in controller}}
<li>
{{#linkTo 'board' board}}{{board.name}}{{/linkTo}}
</li>
{{/each}}
</ul>
</div>
<div class="span9">
{{outlet}}
</div>
</div>
</script>
<script type="text/x-handlebars" id="board">
<header id="header">
<h1>{{game.name}} - {{name}} <small>{{owner.nickname}}</small></h1>
</header>
</script>
<script src="js/libs/jquery.js"></script>
<script src="js/libs/bootstrap.js"></script>
<script src="js/libs/handlebars.js"></script>
<script src="js/libs/ember.js"></script>
<script src="js/application.js"></script>
<script src="js/router.js"></script>
<script src="js/models/game.js"></script>
<script src="js/models/user.js"></script>
</body>
</html>

Ok, I finally figured out the problem. In my gameRoute I wrote this:
MGames.GameRoute = Ember.Route.extend ({
model: function(params) {
return MGames.Board.findAllByGame(params.game_id);
}
});
It worked when I write the URL directly in the browser bar, because Ember calls the model function, but when following a {{#linkTo}} the model is the one passed as parameter, so the modelfunction isn't called.
So the working code is this one (a little bit simplified):
MGames.GameRoute = Ember.Route.extend ({
model: function (params) {
// This is only called when loading the URL directly,
// not following a link. We load the game, and in the
// setupController we'll load the boards.
return MGames.Game.find(params.game_id);
},
setupController: function(controller, game) {
// This is *always* called, so we load the boards
model = MGames.Board.findAllByGame(game.id);
controller.set('model', model);
}
});

The board route that you are linking to has 2 dynamic segments, but you are providing only one. You need to change to,
{{#linkTo 'board' game board}}The board{{/linkTo}}
The undefined error is probably due to the ArrayController not getting a board as the corresponding game id is being passed as undefined. The above change should fix that too.

How to bind data from two tables in PhoneJs?

I have two tables:
nom_articole { id(PK), denumire, nom_um_id(FK) }
nom_um { id(PK), simbol, denumire }
I want to display:
nom_articole.id
nom_articole.denumire
nom_um.simbol
My html code:
<div data-options="dxView : { name: 'nom_articoleDetails', title: 'Nom_articole' } " >
<div data-options="dxContent : { targetPlaceholder: 'content' } " >
<div data-bind="dxScrollView: { }">
<h2 data-bind="text: nom_articole.denumire"></h2>
<div class="dx-fieldset">
<div class="dx-field">
<div class="dx-field-label">ID</div>
<div class="dx-field-value" data-bind="text: nom_articole.id"></div>
</div>
<div class="dx-field">
<div class="dx-field-label">Denumire</div>
<div class="dx-field-value" data-bind="text: nom_articole.denumire"></div>
</div>
<div class="dx-field">
<div class="dx-field-label">U.M.</div>
<div class="dx-field-value" data-bind="text: ????????????????"></div>
</div>
</div>
<div data-options="dxContentPlaceholder : { name: 'view-footer', transition: 'none' } " ></div>
</div>
</div>
My Javascrip code:
MobileApplication.nom_articoleDetails = function(params) {
return {
id: params.id,
//nom_um: new MobileApplication.nom_umViewModel(),
nom_articole: new MobileApplication.nom_articoleViewModel(),
handleDelete: function() {
DevExpress.ui.dialog.confirm("Are you sure you want to delete this item?", "Delete item").then($.proxy(function (result) {
if (result)
this.handleConfirmDelete();
}, this));
},
handleConfirmDelete: function() {
MobileApplication.db.nom_articole.remove(params.id).done(function() {
MobileApplication.app.navigate("nom_articole", { target: "back" });
});
},
viewShown: function() {
nom_articoleDetails = this;
MobileApplication.db.nom_articole.byKey(params.id).done(function(data) {
nom_articoleDetails.nom_articole.fromJS(data);
});
}
};
This code was generated by Devexpress multi-channel application wizard.

From the information you gave, and provided that nom_articole and nom_um share the same key, the code would be:
viewShown: function() {
// ... your code ...
MobileApplication.db.nom_um.byKey(params.id).done(function(data) {
nom_articoleDetails.nom_um.fromJS(data);
});
}
You uncomment the nom_um member and use text: nom_um.simbol as the binding text in the view.
Update:
To load an object by foreign key, you have two options. The first is cascading fetches:
MobileApplication.db.nom_articole.byKey(19).done(function (data) {
nom_articoleDetails.nom_articole.fromJS(data);
MobileApplication.db.nom_um.byKey(data.nom_um_id).done(function(data) {
nom_articoleDetails.nom_um.fromJS(data);
});
});
The second will work if your data service is properly configured OData. In this case you may use the expand feature:
MobileApplication.db.nom_articole.byKey(19, { expand: "nom_um" }).done(function (data) {
// data will contain a nested object
});
P.S. DevExpress provides Support service, and in case you cannot find the right answer here, you can ask them and share the solution.

Backbone.js adding sub-view elements to parent-view's element

I have a collection view and a model view, like so:
EventListView
|-- EventView
EventListView must display many EventViews in a one-to-many relationship. I am using the underscore _.template() function to build my views templates.
Here is my EventView template:
<h1>
<span class="date"><%= prefix %><%= dateString %></span>
<span class="title"><%= title %></span>
</h1>
<div class="caption"><%= caption %></div>
My EventView render method:
render: function () {
this.$el.html(this.template(this.model.attributes));
return this;
}
And here is my EventListView template:
<h1>
<% if(typeof(title) != "undefined") { print(title) } %>
</h1>
<%= events %>
And it's render method:
// this._EventViews is an array of eventView objects
render: function() {
var templateData = {
events: _.reduce(this._EventViews, function(memo, eventView) { return memo + eventView.$el.html(); }, "")
}
this.$el.html(this.template(templateData));
return this;
}
The problem I am having is that eventView.$el.html() contains only the HTML in my template, but I need to take advantage of the tagName, className and id attributes that Backbone views support.
Consider if I set up EventView like so:
return Backbone.View.extend({
model: EventModel
, tagName: 'article'
, className: 'event'
, template: _.template(templateText)
, render: function () {
this.$el.html(this.template(this.model.attributes));
return this;
}
});
I want to insert:
<article class="event" id="someID342">
<h1>
<span class="date">01/02/2010</span>
<span class="title"></span>
<div class="caption></div>
</h1>
</article>
but eventView.$el returns:
<h1>
<span class="date">01/02/2010</span>
<span class="title"></span>
<div class="caption></div>
</h1>
How do I insert the entire eventView element? Not just it's innerHTML.

Just reserve placeholder in your EvenListView's template
<h1><%- title %></h1>
<div class="js-events"></div>
And then render and append child views
render: function() {
this.$el.html(this.template({title: 'Title'}));
this.$events = this.$('.js-events');
_.each(this._EventViews, function (eventView) {
this.$events.append(eventView.render().$el);
}, this);
return this;
}

The render() function shouldn't be responsible for handling the setup of the view.el. This is done by Backbone in the _ensureElement function that is called when you initialize the view.
Also, the $.fn.html() function is only supposed to return the contents of the selected element.

You have many options but I think the most flexible and sustainable approach is to get each sub view to define its own template. The parent view simply appends the child elements .el property.
The advantages of this approach, your template is only compiled once. And updates to children do not require re-rendering parent and neighbouring elements.
Here is a JSBin
Example:
var ContainerView = Backbone.View.extend({
tagName: "article",
className: "event",
id: "someID342",
initialize: function(options){
//the template will now be rendered
this.childView = new ChildView()
//the rendered child will now appear within the parent view
this.el.appendChild( this.childView.el )
}
})
var ChildView = Backbone.View.extend({
tagName: "h1",
dateString:"01/02/2010",
prefix: "Date: ",
caption: "What a wonderful date!:",
title: "I am a title",
template: _.template([
'<h1>',
'<span class="date"><%= prefix %><%= dateString %></span>',
'<span class="title"><%= title %></span>',
'</h1>',
'<div class="caption"><%= caption %></div>'
].join("")),
initialize: function(){
this.render()
},
render: function(){
// because you are only altering innerHTML
// you do not need to reappend the child in the parent view
this.el.innerHTML = this.template(this)
}
})
I'd personally caution against using templates in Backbone at all. I've found that simply having a Backbone view for every component of your app becomes a lot easier to edit later. Sharing templates is a lot harder than sharing views. Of course it depends on the requirements of your project.

Ember Transition with query param

I'm creating an ember.js app. The first page is single field, with a button. On button click, I'd like it to go to the path #/deals/:api_key. However, when I click the button, I'm not clear on the best way to go about it.
Here's what i have so far:
App = Ember.Application.create();
App.Store = DS.Store.extend({
revision: 12,
adapter: 'DS.FixtureAdapter'
});
App.Deal = DS.Model.extend({
name: DS.attr('string')
});
App.Router.map(function() {
this.resource('start', { path: '/' });
this.resource('deals', { path: '/deals/:api_key' });
});
App.DealsRoute = Ember.Route.extend({
model: function(params) {
return App.Deal.find();
}
});
App.StartController = Ember.ObjectController.extend({
apiKey: "",
getDeals: function (model) {
this.transitionToRoute('deals');
}
});
App.DealsView = Ember.View.extend({
didInsertElement: function() {
// Add active class to first item
this.$().find('.item').first().addClass('active');
this.$().find('.carousel').carousel({interval: 1000});
}
});
<script type="text/x-handlebars" data-template-name="start">
{{view Em.TextField valueBinding="apiKey" placeholder="API Key"}}
<br />
<button {{action 'getDeals'}} class="btn btn-large">Get Won Deals!</button>
</script>
<script type="text/x-handlebars" data-template-name="deals">
<div id="carousel" class="carousel slide">
<div class="carousel-inner">
{{#each model}}
<div class="item">
{{name}}
</div>
{{/each}}
</div>
</div>
</script>
Any suggestions on the right way to pass data from a text input into the next transition as a query param?

you need to pass the parameter in the view in a linkTo helper, e.g.
{{#linkTo 'deals' api_key}}go to deals{{/linkTo}}
this generates a link with the dynamic section you need.
go to deals
check the docs about linkTo for more info: http://emberjs.com/guides/templates/links/