It's old question but still gets a lot of hits. In the current version of Ember.JS one can use _view.contentIndex
to display current index inside the loop.
{{#each}}
Index: {{_view.contentIndex}}
{{/each}}
If you need an adjusted index (for instance starting from 1) then there is a possibility of creating reusable helper increment
Ember.Handlebars.registerBoundHelper('increment', function(integer) {
return integer + 1;
});
then you would use it in the following way
{{#each}}
Index: {{increment _view.contentIndex}}
{{/each}}
Update
Starting with ember 1.11 you can do as well
{{#each people as |person index|}}
Index: {{increment index}}
{{/each}}
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