Take a look at the code provided below:
I am attempting to access the index using {{@index}}, but it doesn't seem to be compiling. I believe that handlebars should support this feature:
{{#each item in model}}
{{@index}}
{{item}}
{{/each}}
The above code is not working as expected for me. I am unsure whether {{@index}} is actually supported or not.
The versions currently being used are:
UPDATE
Exciting news! With this latest PR, the each helper in Ember now supports indexing using the new block params syntax. This feature is currently available on canary and is expected to be enabled by default in ember 1.11
{{#each model as |item index|}}
<li>
Index: {{index}} Content: {{item}}
</li>
{{/each}}
Check out a live sample here
FOR PREVIOUS VERSIONS
If you're working with an older version, you can still achieve similar functionality using {{_view.contentIndex}}.
{{#each item in model}}
<li>
Index: {{_view.contentIndex}} Content: {{item}}
</li>
{{/each}}
In the Ember Handlebars version, this feature does not exist. However, one workaround is to use an item controller and include a property that specifies if it's the first or last item.
App.IndexController = Ember.ArrayController.extend({
itemController: 'itemer'
});
App.ItemerController = Ember.ObjectController.extend({
needs:['index'],
isFirst: function(){
return this.get('color') === this.get('controllers.index.firstObject.color');
}.property('controllers.index.firstObject')
});
Please take note that as of October 2014, Ember does not have support for the @index syntax or any other @data type properties.
This limitation is discussed at:
https://github.com/toranb/ember-template-compiler/issues/16#issuecomment-38823756
One interesting approach, highlighted by @kingpin2k, is to follow The Ember Way by using a controller to enhance a model. Specifically, adding an index property to signify its position in the collection.
My personal twist on this method involves creating a dedicated set of instance controllers tailored for the specific task:
App.PostsIndexController = Ember.ArrayController.extend({
indexedContent: function() {
get('content').map(function(item, index) {
App.PostsItemController.create({
content: item,
index: index
});
});
}.property('content')
});
App.PostsItemController = Ember.ObjectController.extend({
index: null
});
If you want to show the index value in your view as 1-indexed, another option to consider is using CSS Counters. These are supported even on older browsers like IE 8.
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