<!-- initializing Angular -->
<html ng-app>
<head>
<!-- setting default value -->
<script language="javascript">
function Ctrl($scope) {
$scope.graph = 'noise_margin';
}
</script>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.0.5/angular.min.js"></script>
</head>
<!-- all code evolves Angular should be wrapped inside some container with ng-controller -->
<body ng-controller="Ctrl">
<!-- selecting value, binding data to 'graph' model -->
<form name="graphForm">
<input type="radio" ng-model="graph" value="noise_margin"> noise_margin
<input type="radio" ng-model="graph" value="speed"> speed
<input type="radio" ng-model="graph" value="attenuation"> attenuation
</form>
<!-- using selected value to display image via 'ng-src' with 'graph' model -->
<img ng-src="http://rrd-graph.example.com/{{graph}}/graph_day.png"><br><br>
<img ng-src="http://rrd-graph.example.com/{{graph}}/graph_week.png"><br><br>
<img ng-src="http://rrd-graph.example.com/{{graph}}/graph_month.png"><br><br>
<img ng-src="http://rrd-graph.example.com/{{graph}}/graph_year.png">
</body>
