AngularJS - How to generate random value for each ng-repeat iteration

Just call add getRandomSpan() function to your scope and call it in your template:

$scope.getRandomSpan = function(){  return Math.floor((Math.random()*6)+1);}<div ng-controller="HomeCtrl">  <div class="motherBox" ng-repeat="n in news">    <div class="childBox" class="col-md-{{getRandomSpan()}} box">      <a href="#" class="thumbnail">        <img src="{{holderLink}}" height="200px" alt="100x100">        <p class="tBlock"> {{n.title}} </p>      </a>      </div>  </div></div>

As an alternative to the accepted answer, since you're likely to reuse this function, you can turn it into a filter for convenience:

angular.module('myApp').filter('randomize', function() {  return function(input, scope) {    if (input!=null && input!=undefined && input > 1) {      return Math.floor((Math.random()*input)+1);    }    }});

Then, you can define the max and use it anywhere on your app:

  <div ng-controller="HomeCtrl">    <div class="motherBox" ng-repeat="n in news">      <div class="childBox" class="col-md-{{6 | randomize}} box">        <a href="#" class="thumbnail">          <img src="{{holderLink}}" height="200px" alt="100x100">          <p class="tBlock"> {{n.title}} </p>        </a>      </div>    </div>  </div>

Improvisation of the accepted answer to prevent digest overflow:

var rand = 1;$scope.initRand = function(){    rand = Math.floor((Math.random()*6)+1)}$scope.getRandomSpan = function(){  return rand;}

<div ng-controller="HomeCtrl">  <div class="motherBox" ng-repeat="n in news">    <div class="childBox" ng-init="initRand()" class="col-md-{{getRandomSpan()}} box">      <a href="#" class="thumbnail">        <img src="{{holderLink}}" height="200px" alt="100x100">        <p class="tBlock"> {{n.title}} </p>      </a>      </div>  </div></div>