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A plugin for displaying Highcharts graphs in Rails
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Merge pull request #3 from cmpowell/master

Allow html tooltips and other options in Rails 3
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README.md

highcharts-rails

Highcharts-rails is a simple helper for displaying Highcharts graphs in your Rails application. This plugin is completely dependent on the Highcharts javascript library by Torstein Hønsi.

Highcharts-rails accepts a combination of hashes and arrays that formatted in a way that Highcharts expects and allows developers to calculate chart data and format chart data/labels/tooltips in the controller and/or model instead of the view.

This plugin is packaged with Highcharts 1.1.3, and jQuery 1.3.2.

This is a fork of https://github.com/loudpixel/highcharts-rails intended to fix a bug formatting tooltips in Rails 3.

Installation

Get the plugin:

script/plugin install git://github.com/loudpixel/highcharts-rails.git

Run the rake setup:

rake highcharts_rails:install

Usage

Include the following in the head of your application layout:

<%= javascript_include_tag 'jquery-1.3.2.min', 'highcharts' %>
<!--[if IE]>
    <%= javascript_include_tag 'excanvas.compiled' %>
<![endif]-->

Some people like to put their javascript at the bottom of the page, regardless of your preference you should include the following to write your javascript, unless you feel it necessary to include your javascript in each view.

<script type="text/javascript">
    $(document).ready(function() {
        <%= yield :javascript %>
    });
</script>

We can collect all of our data, and format everything we need to in our controller:

# Create a pie chart
browser_data = [
  {:name => 'Safari',               :y => 3.57,     :identifier => 'applewebkit'},
  {:name => 'Firefox',              :y => 22.32,    :identifier => 'gecko'}, 
  {:name => 'Internet Explorer',    :y => 56.9,     :identifier => 'msie'}, 
  {:name => 'Other',                :y => 17.21}
]

user_agent = request.env['HTTP_USER_AGENT'].downcase

# determine the users browser and pull that piece of the pie chart
browser_data.each do |browser|
  if user_agent.index(browser[:identifier].to_s)
    browser[:sliced] = true

    # some browsers will match more than one identifier, stop looking as soon as one is found
    break;
  end
end

# format the labels that show up on the chart
pie_label_formatter = '
  function() {
    if (this.y > 15) return this.point.name;
  }'

# format the tooltips
pie_tooltip_formatter = '
  function() {
    return "<strong>" + this.point.name + "</strong>: " + this.y + " %";
  }'

@pie_chart = 
    Highchart.pie({
    :chart => {
          :renderTo => "pie-chart-container",
          :margin => [50, 30, 0, 30]
        },
        :credits => {
          :enabled => true,
          :href => 'http://marketshare.hitslink.com/browser-market-share.aspx?qprid=3',
          :text => 'Data provided by NETMARKETSHARE'
        },
        :plotOptions => {
          :pie => {
            :dataLabels => {
              :formatter => pie_label_formatter, 
              :style => {
                :textShadow => '#000000 1px 1px 2px'
              }
            }
          }
        },
      :series => [
            {
                :type => 'pie',
                :data => browser_data
            }
        ],
        :subtitle => {
          :text => 'January 2010'
        },
        :title => {
          :text => 'Browser Market Share'
        },
        :tooltip => {
          :formatter => pie_tooltip_formatter
        },
    })

In your views you can use a content block to provide the above your javascript and markup for the chart. This will generate a string of javascript that will produce the Highcharts graph and insert into the div:

<!-- container to hold the pie chart -->
<div id="pie-chart-container" class="chart-container"></div>

<% content_for :javascript do %>
    <%= @pie_chart %>
<% end %>
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