The accepted answer is the obvious solution however presentation logic should remain in view and not in controllers or models. Also I wasn’t able to get the OP’s solution to work.
Here are two ways to do create grid system when you have a flat list(array) of items.
Say our item list is a alphabet:
$scope.alphabet = ['A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M',
'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z'];
Method 1:
This is a pure angular solution.
<div class="row" ng-repeat="letter in alphabet track by $index" ng-if="$index % 4 == 0">
<div class="col-xs-3 letter-box"
ng-repeat="i in [$index, $index + 1, $index + 2, $index + 3]"
ng-if="alphabet[i] != null">
<div>Letter {{i + 1}} is: <b> {{alphabet[i]}}</b></div>
</div>
</div>
The outer loop execute after every 4 iterations and creates a row. For each run of the outer loop the inner loop iterates 4 times and creates columns. Since the inner loop runs 4 times regardless of whether we have elements in array or not, the ng-if makes sure that no extraneous cols are created if the array ends before inner loop completes.
Method 2:
This is much simpler solution but requires angular-filter library.
<div class="row" ng-repeat="letters in alphabet | chunkBy:4">
<div class="col-xs-3 letter-box" ng-repeat="letter in letters" >
<div>Letter {{$index + 1}} is: <b> {{letter}}</b></div>
</div>
</div>
The outer loop creates groups of 4 letters, corresponding to our ‘row’
[['A', 'B', 'C', 'D'], ['E', 'F', 'G', 'H'], ... ]
The inner loop iterates over the group and creates columns.
Note: Method 2 might require evaluation of filter for each iteration of outer loop, hence method 2 may not scale very well for huge data sets.