AngularJS: ng-repeat track by $index inside nested loops

Question

I need a second $index for my nested ng-repeat loop. How and where should I put it?

AngularJS site says

Creating aliases for these properties is possible with ngInit. This may be useful when, for instance, nesting ngRepeats.

<div ng-repeat="person in persons track by $index">     <div ng-repeat="something in array track by $index2"> <!-- where to init this and how to manage it?--> 

If I use $index again, it seems to work but I am not sure this is the right thing? I am sure there is an easy and correct way of doing it, I just wasn't able to find an example.

Thanks

Answer 1

$index will refer to the index on the innermost ngRepeat scope, so if that's what you need, you can just use it.

What the docs is describing is a scenario where you need access to $index in the parent ngRepeat. You can get it in a couple of ways: One is to use $parent, and another is to use ngInit, as the Angular docs suggested. Here's an example...

<li ng-repeat="thing in things" ng-init="parentIndex = $index">     {{ $index }}     <ul>         <li ng-repeat="value in thing.values">             {{ value }}              {{ $index }} <!-- inner $index -->             {{ $parent.$index }} <!-- parent $index -->             {{ parentIndex }} <!-- also parent $index -->         </li>     </ul> </li> 

Fiddle