D3.js Reusable Bar Chart with Angularjs

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <style>
        body {
            font: 14px sans-serif;
        }
        .axis path, .axis line {
            fill: none;
            stroke: black;
            shape-rendering: crispEdges;
        }
        .axis path{
            fill: none;
            stroke: none;
        }
        .bar {
            fill: steelblue;
        }
    </style>
</head>
<script type="text/javascript" src="https://d3js.org/d3.v3.min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.0.6/angular.min.js"></script>
<script src="./reusable_chart.js"></script>

<body>

angular.module('charts', [])
        .controller('mainCtrl', function AppCtrl ($scope) {
            $scope.options = {width: 500, height: 300, 'bar': 'aaa'};
            $scope.data = [1, 2, 3, 4];
            $scope.hovered = function(d){
                $scope.barValue = d;
                $scope.$apply();
            };
            $scope.barValue = 'None';
        })
        .directive('barChart', function(){
            var chart = d3.custom.barChart();
            return {
                restrict: 'E',
                replace: true,
                template: '<div class="chart"></div>',
                scope:{
                    height: '=height',
                    data: '=data',
                    hovered: '&hovered'
                },
                link: function(scope, element, attrs) {
                    var chartEl = d3.select(element[0]);
                    chart.on('customHover', function(d, i){
                        scope.hovered({args:d});
                    });

scope.$watch('data', function (newVal, oldVal) {
                        chartEl.datum(newVal).call(chart);
                    });

scope.$watch('height', function(d, i){
                        chartEl.call(chart.height(scope.height));
                    })
                }
            }
        })
        .directive('chartForm', function(){
            return {
                restrict: 'E',
                replace: true,
                controller: function AppCtrl ($scope) {
                    $scope.update = function(d, i){ $scope.data = randomData(); };
                    function randomData(){
                        return d3.range(~~(Math.random()*50)+1).map(function(d, i){return ~~(Math.random()*1000);});
                    }
                },
                template: '<div class="form">' +
                        'Height: {{options.height}}<br />' +
                        '<input type="range" ng-model="options.height" min="100" max="800"/>' +
                        '<br /><button ng-click="update()">Update Data</button>' +
                        '<br />Hovered bar data: {{barValue}}</div>'
            }
        });

</script>
</body>
</html>

Modified http://d3js.org/d3.v3.min.js to a secure url

https://d3js.org/d3.v3.min.js

https://ajax.googleapis.com/ajax/libs/angularjs/1.0.6/angular.min.js