Class: ObjectView::ChartLoadJavascript

Inherits:
Javascript show all
Defined in:
lib/object_view/chart_load_javascript.rb

Instance Attribute Summary

Attributes inherited from Element

#acceptable_children, #attributes, #children, #single_line, #tag

Instance Method Summary collapse

Methods inherited from Element

#<<, #add, #add_with_tag, #attr, #css_class=, #find_element_with_tag, #id=, #is_acceptable_child?, #on_click=, #render, #render_attributes, #render_children, #style=

Constructor Details

#initialize(chart_load_js_content) ⇒ ChartLoadJavascript

Returns a new instance of ChartLoadJavascript.


6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
 
# File 'lib/object_view/chart_load_javascript.rb', line 6

def initialize(chart_load_js_content)
  super()
  add "
  //  Chart Partial erb:  <%= Time.new.to_s%>

  function drawChart() {
      #{chart_data_load_script(chart_load_js_content)}
   }

  function initializeChart() {
	  google.load('visualization', '1', {packages:['corechart']});
	  google.setOnLoadCallback(drawChart);
  }
  initializeChart();
   "
end

Instance Method Details

#chart_data_load_script(chart_load_js_content) ⇒ Object 


23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
 
# File 'lib/object_view/chart_load_javascript.rb', line 23

def chart_data_load_script(chart_load_js_content)
  script = ""
 	chart_load_js_content.each do |chart_data|  
    chart_object = "Error"
    if (chart_data.chart_type == :line)
      chart_object = "LineChart"
    elsif(chart_data.chart_type == :pie)
      chart_object = "PieChart"
    elsif(chart_data.chart_type == :stacked_area)
      chart_object = "AreaChart"
    elsif(chart_data.chart_type == :area)
      chart_object = "AreaChart"
    elsif(chart_data.chart_type == :stepped_area)
      chart_object = "SteppedAreaChart"
    else
      raise ("chart_data needs a valid 'chart_type':  :line or :pie")
    end
  
  #      Rails.logger.info "Chart data y-axis (as js render): #{chart_data.y_axis_labels}"
    y_axis_elements = ""
    chart_data.y_axis_labels.each do |label|
      y_axis_elements += "'#{label}'"
      if (chart_data.y_axis_labels.last != label)
        y_axis_elements += ", "
      end
    end

  #      script += "// #{chart_data.series}\n"
    script += "var chartArray = ([ \n" 
    script += "['#{chart_data.x_axis_label}', #{y_axis_elements}], \n"
    show_legend = false
 	  chart_data.series.each do |data|
   	  script += "         "
      script += "["
      if (data.length > 2)
        show_legend = true
      end

      (0..data.length - 1).each do |i|
        data_item = data[i]
        if (i == 0)
          script += "'#{data_item}'"
        else
          script += "#{data_item}"
        end
        if (i != data.length - 1)
          script += ", "
        end
      end
      script += "]"
      if (chart_data.series.last != data)
        script += ","
        script += "\n"
      end
 	  end    
 	  script += "    ]);\n"
 	  script += "      var chartData = google.visualization.arrayToDataTable(chartArray); \n" 
 	  script += "      var chart = new google.visualization.#{chart_object}(document.getElementById('#{chart_data.id}'));\n"
    if (chart_data.chart_type == :pie)
      script += "
       	  var options = {
       	 	  title: '#{chart_data.label}'
       	 }
         "
    else
      if (show_legend)
        legend_value = ""
      else
        legend_value = "legend: 'none',"
      end


      if(chart_data.chart_type == :stacked_area)
    
        script += "
         	  var options = {
              vAxis: {minValue: 0},
              isStacked: true,
         	 	  title: '#{chart_data.label}',
      		    displayAnnotations: true,
         		  curveType: 'function',
      		    fontSize: 10
         	 }
           "
       else        
          script += "
         	  var options = {
         	 	  title: '#{chart_data.label}',
              #{legend_value}
      		    displayAnnotations: true,
         		  curveType: 'function',
      		    fontSize: 10
         	 }
           "
         end
     end
     script += "   chart.draw(chartData, options);\n"
   
   end
   return script    
end