EmberJS: Observer Not Being Triggered on Computed Property - forms

Question

I am building a handelbars helper that renders a checkbox group. My goal is to display a checkbox group with something like this and get two-way binding on selectedOptions:
{{form-checkboxGroup options=allOptions selectedOptions=selectedOptions}}
I've used this pattern successfully with other form components and it's a big win. I'm able to render my allOptions and selectedOptions values as a checkbox group, but it's the two-way binding that's tripping me up. Any idea what I'm missing?
By the way, I'm using ember-cli, but that doesn't affect anything relating to this issue.
Here's my setup:
Handlebars Helper: helpers/form-checkbox-group.js
The sole purpose of this file is to link the Handelbars expression {{form-checkboxGroup}} to the view and template below.
import FormCheckboxGroupView from 'my-app/views/util/form/form-checkbox-group';
export default Ember.Handlebars.makeBoundHelper(function( options ) {
return Ember.Handlebars.helpers.view.call(this, FormCheckboxGroupView, options);
});
CheckboxGroup Handlebars Template: templates/util/form/form-checkbox-group.hbs
...
{{#each user in view.combinedOptions}}
{{input type="checkbox" name="view.fieldName" checked=user.checked }} {{user.name}}
{{/each}}
...
CheckboxGroup View: views/util/form/form-checkbox-group.js
...
export default FormCheckboxGroupView = Ember.View.extend( FormFieldMixin, {
templateName: 'util/form/form-checkbox-group',
selectedOptions: function() {
console.log("When triggered this could update view.selectedOptions");
}.observes('view.combinedOptions.#each.checked'),
// combines the "options" and "selected options" into a single array of "combinedOptions" explicitly indicating what's checked
combinedOptions: function() {
...
// sample result of combinedOptions:
// { name: "Johnny Five", id: "12", checked: true }
return combinedOptions;
}.property('view.options', 'view.selectedOptions')
});
And finally, to actually use my Handlebars helper, here's the consuming page's template and corresponding controller:
Consuming Page: templates/my-page.hbs
{{form-checkboxGroup options=allUsersArray selectedOptions=selectedUsersArray fieldName="selectedProvidersArray" }}
Backing Controller for Consuming Page: controllers/my-page.js
export default MyPageController = Ember.Controller.extend( FormMixin, {
allUsersArray: [
{ name: 'Bill Huxtable', id: 'billy' },
{ name: 'Samantha Jones', id: 'jones' },
{ name: 'Tony Pepperoni', id: 'tonyp' },
{ name: 'Ridonk Youliss', id: 'silly' }
],
selectedUsersArray: [
{ name: 'Tony Pepperoni', id: 'tonyp' },
{ name: 'Ridonk Youliss', id: 'silly' }
],
...
});
So, all of this successfully renders the checkbox group nicely, but my efforts to capture the fact that a checkbox has been newly selected by using observes("view.combinedOptions.#each.checked') is not working.
Any idea on how I can this up for two-way binding? Thanks in advance for assistance!

Answer 1

No jsbin so I'm flying blind, but try this:
selectedOptions: function() {
console.log("When triggered this could update view.selectedOptions");
}.observes('combinedOptions.#each.checked')
view.property is how you access view from template. You don't need that from the view itself (unless you have view property on your view).