energylink/public/app/plugins/datasource/prometheus/query_ctrl.js

define([
  'angular',
  'lodash',
],
function (angular, _) {
  'use strict';

  var module = angular.module('grafana.controllers');

  module.controller('PrometheusQueryCtrl', function($scope) {

    $scope.init = function() {
      var target = $scope.target;

      target.expr = target.expr || '';
      target.intervalFactor = target.intervalFactor || 2;

      $scope.metric = '';
      $scope.resolutions = _.map([1,2,3,4,5,10], function(f) {
        return {factor: f, label: '1/' + f};
      });

      $scope.$on('typeahead-updated', function() {
        $scope.$apply($scope.inputMetric);
        $scope.refreshMetricData();
      });
    };

    $scope.refreshMetricData = function() {
      if (!_.isEqual($scope.oldTarget, $scope.target)) {
        $scope.oldTarget = angular.copy($scope.target);
        $scope.get_data();
      }
    };

    $scope.inputMetric = function() {
      $scope.target.expr += $scope.target.metric;
      $scope.metric = '';
    };

    $scope.suggestMetrics = function(query, callback) {
      $scope.datasource
        .performSuggestQuery(query)
        .then(callback);
    };

    $scope.init();
  });

});