Class: ObjectView::ChartLoadJavascriptAjax

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

Instance Attribute Summary

Attributes inherited from Element

#acceptable_children, #children, #single_line, #tag

Instance Method Summary collapse

Methods inherited from Element

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

Constructor Details

#initialize(chart_load_js_content, ajax_refresh_seconds = nil, prepend_script = "") ⇒ ChartLoadJavascriptAjax

Returns a new instance of ChartLoadJavascriptAjax.



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# File 'lib/object_view/chart_load_javascript_ajax.rb', line 8

def initialize(chart_load_js_content, ajax_refresh_seconds = nil, prepend_script = "")
  super()



  script = "
  #{prepend_script}

  var _nextTimeToDraw = jQuery.now() + 1000;
  var _doingPeriodicCheck = false;

  function periodicCheck() {
    if (_initializedCharts) {
      if (!_doingPeriodicCheck) {
        _doingPeriodicCheck = true;
        var now = jQuery.now();
        if (_nextTimeToDraw != null) {
          if (now > _nextTimeToDraw) {
            _doingPeriodicCheck = false;
            if (_currentlyDrawing == false) {
              _nextTimeToDraw = null;
              drawChart();
            } else {
            }
          }
        }
        _doingPeriodicCheck = false;
      }
    } else {
      console.log('Waiting for google charts to initialize');
      initializeChart();
    }
  }


  var _chartRequestMade = false;
  function makeChartDrawRequest(time) {
    var nextTime = jQuery.now() + time;
    if ((_nextTimeToDraw == null) || (nextTime < _nextTimeToDraw)) {
      _nextTimeToDraw = nextTime;
    }
    console.log('Request to drawChart queued for: ' + _nextTimeToDraw);
  }

  function clearCharts() {
    #{clear_script_for_each_chart(chart_load_js_content)}
  }


    _currentlyDrawing = false;
    function drawChart() {
        console.log('drawChart called');
        try {
            _currentlyDrawing = true;
            console.log('Drawing charts.');
            //alert('drawChart()');
             #{chart_data_load_script(chart_load_js_content)}
             console.log('Finished drawing charts.');
    " 
  if (ajax_refresh_seconds != nil)   
    script += "     
             console.log('finished drawing chart.  Queuing another drawChart request.');
  
             makeChartDrawRequest(#{ajax_refresh_seconds * 1000});\n
             _currentlyDrawing = false;
    "
  end

  script += "    
        }  catch(error) {
           console.log('Exception drawing chart: ' + error);
           _currentlyDrawing = false;
           makeChartDrawRequest(1000);
        }
        _currentlyDrawing = false;
      }
   "
	chart_load_js_content.each do |chart_data|  
    script += " $('##{chart_data.id}').html('<h2 style=\"color: #aaaaaa\">Building Chart...</h2>'); \n"
  end
 
   script +=  "  initializeChart();\n;"
   script +=  "  setInterval(periodicCheck, 500);\n"
   if (ajax_refresh_seconds != nil)
     script += " makeChartDrawRequest(1000); \n"
   else
     script += "makeChartDrawRequest(1000);\n"
   end
   add script
end

Instance Method Details

#chart_data_load_script(chart_load_js_content) ⇒ Object 



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# File 'lib/object_view/chart_load_javascript_ajax.rb', line 110

def chart_data_load_script(chart_load_js_content)
  script = ""
 	chart_load_js_content.each do |chart_data|  
    params = []
    
    chart_data.ajax_params.each do |name, value|
    #  params_string += "#{name}=#{value}&"
      params << [name, value]
    end
    # if (params_string.length > 0)
    #   params_string = params_string[0..params_string.length - 2]
    # end
    params_string = URI.encode_www_form(params)
  
  
    chart_object = "Error"
    additional_options_script = ""
    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"
      additional_options_script = "   options['isStacked'] = true;\n"
    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
  
    if (params_string.length > 0)
      script += "  var params = '#{params_string}';\n" 
      if (chart_data.ajax_method_for_params != nil)
        script += "  params = params + '&' + #{chart_data.ajax_method_for_params};\n" 
      end
    else
      if (chart_data.ajax_method_for_params != nil)
        script += "  var params = #{chart_data.ajax_method_for_params};\n" 
      else
        script += "  var params = '';\n" 
      end
    end
  
    script += "
      $.ajax({
        type: 'POST',
        url: '#{chart_data.ajax_url}',
        data: params,
        dataType: 'text',
        success: function(response) {
          //alert(\"Response: \" + response);
          var chartData = jQuery.parseJSON(response);

          //alert('Json: ' + chartData);
          var seriesJson = chartData.series;

          var options = chartData.options;
          #{additional_options_script}
          //alert('Options: ' + options);
        
           var series = [];
           for (var i = 0; i < seriesJson.length; i++) {
             var dataPointJson = seriesJson[i];
             var dataPoint = [];
             dataPoint.push(dataPointJson[0].toString());
             for (var j = 1; j < dataPointJson.length; j++) {
               dataPoint.push(dataPointJson[j]);
             }
             series.push(dataPoint);
          }

          // var number = 5
          // var series = [ ['Time', 'Count'], [number.toString(), 0], ['04/30/2013', 0], ['05/28/2013', 0], ['06/25/2013', 0]  ];
          var chartElementId = '#{chart_data.id}';
          //alert('Series: ' + series);
          var chartData = google.visualization.arrayToDataTable(series);
          var chart = new google.visualization.#{chart_object}(document.getElementById(chartElementId));
        
           chart.draw(chartData, options);
        },
        error: function(XMLHttpRequest, textStatus, errorThrown) {
          $('##{chart_data.id}').html('<h3>Error getting chart data - QA server may be down.</h3>');
        }
      });
      "
   end
   return script    
end

#clear_script_for_each_chart(chart_load_js_content) ⇒ Object 



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# File 'lib/object_view/chart_load_javascript_ajax.rb', line 100

def clear_script_for_each_chart(chart_load_js_content) 
  script = ""
 	chart_load_js_content.each do |chart_data|  
    chart_data.id
    script += "  $('##{chart_data.id}').html('<h3 style=\"color: #aaaaaa\">Building Chart</h3>');\n"
  end
  return script
end