JSFiddle - React, Tailwind, and code Playground

HTML

<div ng-controller="ChckbxsCtrl">
    <div ng-repeat="chk in chkbxs">
        <input type="checkbox" ng-model="chk.val" />
        <label>{{chk.label}}</label>
    </div>
    <div ng-show="bandChoosed()">I'm ON when band choosed</div>
</div>

JavaScript

function ChckbxsCtrl( $scope , $filter ){
    $scope.chkbxs = [{label:"Led Zeppelin", val:false },{label:"Electric Light Orchestra", val:false },{label:"Mark Almond", val:false }];
    
    $scope.bandChoosed = function() {
        var trues = $filter("filter")( $scope.chkbxs , {val:true} );
        return trues.length;
    }
}