My code is as follows：
<div data-ng-repeat="rule in rules">
<input type="number" name="ScaleOutThreshold{{$index}}"
required="true" data-ng-model="rule.ScaleOutThreshold>
<span ng-show="ScaleOutThreshold{{$index}}.$error.required"
class="alert-danger">Required</span>
</div>
but when I empty the value of input type=“number”, the class of span is
still ng-hide, so the error validation doesn't work, I wonder the reason
caused that is the using of {{$index}}, but I need the index to distinguish
the different input number name under ng-repeat.
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