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              <script src="https://d3js.org/d3.v3.min.js" charset="utf-8"></script>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.0.7/angular.min.js"></script>

<div ng-app="myApp" ng-controller="Ctrl">
    <bars-chart chart-data="myData"  ></bars-chart>
              .chart {
    background: #eee;
    padding: 3px;

.chart div {
  width: 0;
  transition: all 1s ease-out;
  -moz-transition: all 1s ease-out;
  -webkit-transition: all 1s ease-out;

.chart div {
  font: 10px sans-serif;
  background-color: steelblue;
  text-align: right;
  padding: 3px;
  margin: 5px;
  color: white;
  box-shadow: 2px 2px 2px #666;
              angular.module('myApp', []).
   //camel cased directive name
   //in your HTML, this will be named as bars-chart
   directive('barsChart', function ($parse) {
     //explicitly creating a directive definition variable
     //this may look verbose but is good for clarification purposes
     //in real life you'd want to simply return the object {...}
     var directiveDefinitionObject = {
         //We restrict its use to an element
         //as usually  <bars-chart> is semantically
         //more understandable
         restrict: 'E',
         //this is important,
         //we don't want to overwrite our directive declaration
         //in the HTML mark-up
         replace: false,
         //our data source would be an array
         //passed thru chart-data attribute
         scope: {data: '=chartData'},
         link: function (scope, element, attrs) {
           //in D3, any selection[0] contains the group
           //selection[0][0] is the DOM node
           //but we won't need that this time
           var chart = d3.select(element[0]);
           //to our original directive markup bars-chart
           //we add a div with out chart stling and bind each
           //data entry to the chart
            chart.append("div").attr("class", "chart")
             .style("width", function(d) { return d + "%"; })
             .text(function(d) { return d + "%"; });
           //a little of magic: setting it's width based
           //on the data value (d) 
           //and text all with a smooth transition
      return directiveDefinitionObject;

function Ctrl($scope) {
    $scope.myData = [10,20,30,40,60, 80, 20, 50];
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