myapp.js

if (Meteor.isClient) {
    Template.template_main.results = function () {
        return Session.get("recentUsage") || [];
    }

    Template.template_sidebar.events = {
        'change .radio': function () {
            var plant = this.key;
            Meteor.call('latestPowerUsage', plant);
        }
    }

    Template.template_sidebar.plants = [
        {"key": "hokkaido", "name": "北海道"},
        {"key": "tohoku", "name": "東北"},
        {"key": "tokyo", "name": "東京"},
        {"key": "chubu", "name": "中部"},
        {"key": "kansai", "name": "関西"},
        {"key": "kyushu", "name": "九州"}
    ];

    Meteor.startup(function () {
        var plant = "tokyo";
        $("input[value='" + plant + "']").attr('checked', 'checked');
        Meteor.call('latestPowerUsage', plant);
    });

    Meteor.methods({
        latestPowerUsage: function (plant) {
            var url = 'http://setsuden.yahooapis.jp/v1/Setsuden/latestPowerUsage?'
                + [
                'appid=hogehoge',
                'output=json',
                'area=' + plant,
                'callback=?'
            ].join('&');

            $.getJSON(url, function (data, status) {
                    Session.set("recentUsage", data.ElectricPowerUsage);
                }
            );
        }
    });
}