Passing parameters from views to controllers using Sproutcore 2

Question

If I have a controller:

HTH.todosController = SC.ArrayProxy.create({
  content: HTH.store.find(HTH.Todo)
});

I can display all todos doing this:

...
<script type="text/x-handlebars">
  {{#collection contentBinding="HTH.todosController"}}
    {{content}}
  {{/collection}}
</script>
...

But how would I display a todo with a specific ID coming from the view?

...
<script type="text/x-handlebars">
  {{#view contentBinding="HTH.todosController.specific" specificId="1"}}
    {{content}}
  {{/view}}
</script>
...

Answer 1

Here's a solution in jsfiddle allowing you to define the specific id of the todo in the handlebars definition of the view as you have in your example. It's a bit crude, but it works.

Handlebars:

<script type="text/x-handlebars">
{{view App.SpecificIdWrapper}}
<hr />
{{#collection App.TodosView contentBinding="App.todosController"}}
    {{content.name}}
{{/collection}}
<hr />
{{view App.SelectedToDoView}}
</script>

<script type="text/x-handlebars" data-template-name="specificId">
{{#view App.SpecificIdView dataBinding="App.todosController.content" specificId=3}}
    Specific Todo Id: {{content.id}}
    <br />
    Specific Todo Name: {{content.name}}
{{/view}}
</script>

<script type="text/x-handlebars" data-template-name="selectedToDo">
{{#view contentBinding="App.todosController.selectedToDo.content"}}
  Selected Todo Id: {{content.id}}
{{/view}}

JavaScript:

App = Ember.Application.create();

App.SpecificIdWrapper = Ember.View.extend({
    templateName: 'specificId'
});

App.SpecificIdView = Ember.View.extend({
content: null,
data: null,
specificId: null,

_getTodoById: function() {
    var data = this.get('data'); 
    if(data) {
        for(var i=0;i<data.length;i++) {
            if(data[i].get('id') === this.get('specificId')) {
                this.set('content', data[i]);
                break;
            }
        }
    }
},

// This will make sure the content is set when the view is rendered
didInsertElement: function() {
    this._getTodoById();
},
// And this will update the content whenever specificId is changed
specificIdDidChange: function() {
    this._getTodoById();
}.observes('specificId')
});

App.SelectedToDoView = Ember.View.extend({
    templateName: 'selectedToDo'
});

App.TodosView = Ember.CollectionView.extend({
itemViewClass: Ember.View.extend({
    click: function() {
        App.todosController.set('selectedToDo', this);
    }
})
});

App.todosController = Ember.ArrayController.create({
content: [
    Ember.Object.create({id: 1, name: "obj1"}),
    Ember.Object.create({id: 2, name: "obj2"}),
    Ember.Object.create({id: 3, name: "obj3"}),
    Ember.Object.create({id: 4, name: "obj4"}),
    Ember.Object.create({id: 5, name: "obj5"}),
    Ember.Object.create({id: 6, name: "obj6"})
],
selectedToDo: null
});