Class: ObjectView::HighChartLoadJavascriptAjax

Inherits:
Javascript show all
Defined in:
lib/object_view/high_chart_ajax_javascript.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_data_list, prepend_script) ⇒ HighChartLoadJavascriptAjax

Returns a new instance of HighChartLoadJavascriptAjax.



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# File 'lib/object_view/high_chart_ajax_javascript.rb', line 6

def initialize(chart_data_list, prepend_script)
  super()
  
  script = ""
  if (prepend_script != nil)
    script += prepend_script
  end
  
  script += chart_class_script()
  
  
  script += "
      _chartHash = new Object();
      _chartList = new Array();
   "
  chart_data_list.each do |chart_data|
    params_line = params_for_chart(chart_data)
    refresh_seconds = chart_data.ajax_refresh_seconds 
    if (refresh_seconds == nil)
      refresh_seconds = "null"
    end
    
    #   'apple=green&extent=' + _extent + ''
    #   'extent=' + _extent + '&' + 'apple=green' + '&' + 'banana=yellow'
    script += "    
        #{params_line}
     var chartDraw = new HighChartDraw('#{chart_data.id}', '#{chart_data.ajax_url}', params, #{refresh_seconds});
     _chartHash['#{chart_data.id}'] = chartDraw;
     _chartList.push(chartDraw);
     console.log('_chartList.length: ' + _chartList.length);
       "         
  end
  script += "
      function periodicCheckForChartDraw() {
        var chartCount = _chartList.length;
        //console.log('periodicCheckForChartDraw()  count: ' + chartCount);
        for (i = 0; i < chartCount; i++) {
          chart = _chartList[i];
          chart.periodicCheck();
        }
      }
    	setInterval(periodicCheckForChartDraw, 500);
  "
  
  self.add script
end

Instance Method Details

#chart_class_script ⇒ Object 



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# File 'lib/object_view/high_chart_ajax_javascript.rb', line 53

def chart_class_script
  script = 
  "
  
  function prepareChartData(chartData) {
    console.log('Data type: ' + typeof(chartData));
    prepareObjectAndChildren(chartData);
  }
  
  
  
  function prepareObjectAndChildren(object) {
    if (typeof(object) == 'object') {
      for (var key in object) {
          if (object.hasOwnProperty(key)) {
              //console.log('key is: ' + key + ', value is: ' + object[key]);
              child = object[key];
              if (typeof(child) == \"object\" ) {
                prepareObjectAndChildren(child);
              } else if (typeof(child) == 'string') {
                //console.log('STRING key is: ' + key + ', value is: ' + object[key]);
                if (child.indexOf('/@') == 0) {
                  var functionCode = child.replace('/@', '');
                  functionCode = functionCode.replace('@/', '');
                  object[key] = function() {
                        return eval(functionCode);
                    }
                  //console.log('STRING (functionCode): ' + key + ', value is: ' + functionCode);
                  //console.log('STRING was function ' + key + ', value is: ' + object[key]);
                }
              }
          }
      }
    }
  }
  //response = response.replace('\"@@', '');
  //response = response.replace('@@\"', '');
  
  
  function HighChartDraw(chartId, ajaxUrl, ajaxParams, refreshSeconds) {
    console.log('Created HighChartDraw  (' + chartId + ')');
  	this.nextTimeToDraw = 0;
    this.currentlyDrawing = false;
  	this.ajaxUrl = ajaxUrl;
  	this.ajaxParams = ajaxParams;
  	this.refreshSeconds = refreshSeconds;
  	this.chartId = chartId;
    console.log('Initializing chart: ' + this.chartId);
  	this.chartRequestMade = false;
  	this.clearChart();
  }
 
  HighChartDraw.prototype.buildParamString = function() {
    var paramString = '';
    for (var paramName in this.ajaxParams) {
        if (this.ajaxParams.hasOwnProperty(paramName)) {
          paramValue = this.ajaxParams[paramName];
          if (paramString.length > 0) {
            paramString = paramString + '&';
          }
          paramString += paramName + '=';
          var indexOfVal = paramValue.indexOf('VAR|');
          if (indexOfVal == 0) {
            var variable = paramValue.substring(4, paramValue.length);
            console.log('Variable for eval: ' + variable);
            paramString += encodeURIComponent(eval(variable));
            //paramString += eval(variable);
          } else {
            paramString += encodeURIComponent(paramValue);
            //paramString += paramValue;
          }
        }
    }
    console.log('Post params: ' + paramString);
    return paramString;      
  }


  HighChartDraw.prototype.draw = function() {
      try {
          this.currentlyDrawing = true;
          console.log('Drawing chart (' + this.chartId + ')');
          var chartElementId = 'chart_1';
  	    	var chartId = this.chartId;
          $.ajax({
              type: 'GET',
              url: this.ajaxUrl,
              data: this.buildParamString(),
              dataType: 'text',
              success: function(response) {
                var chartData = jQuery.parseJSON(response);
                prepareChartData(chartData);
                $('#' + chartId).highcharts(chartData);
              },
              error: function(XMLHttpRequest, textStatus, errorThrown) {
                $('#' + chartId).html('<h3>Error getting chart data - QA server may be down.</h3>');
              }
          });
          console.log('finished drawing chart.  Queuing another drawHighChart request.');
          if (this.refreshSeconds != null) {
            this.makeChartDrawRequest(1000 * this.refreshSeconds);
          }
          this.currentlyDrawing = false;
      } catch(error) {
         console.log('Exception drawing chart: ' + error);
         this.currentlyDrawing = false;
         this.makeChartDrawRequest(1000);
         throw error;
      }
      this.currentlyDrawing = false;
  }

  HighChartDraw.prototype.clearChart = function() {
  	$('#' + this.chartId).html('<h2 style=\"color: #aaaaaa\">Building Chart...</h2>'); 
  }

  HighChartDraw.prototype.makeChartDrawRequest = function(millisFromNow) {
      var nextTime = jQuery.now() + millisFromNow;
      if ((this.nextTimeToDraw == null) || (nextTime < this.nextTimeToDraw)) {
        this.nextTimeToDraw = nextTime;
      }
      console.log('Request to drawHighChart (' + this.chartId + ') queued for: ' + this.nextTimeToDraw);
  }

  HighChartDraw.prototype.periodicCheck = function() {
    //console.log('periodicCheck for ' + this.chartId);
  	var now = jQuery.now();
  	if (this.nextTimeToDraw != null) {
  	  if (now > this.nextTimeToDraw) {
  	    this.doingPeriodicCheck = false;
  	    if (this.currentlyDrawing == false) {
  	      this.nextTimeToDraw = null;
  	      this.draw();
  	    } else {
          //console.log('periodicCheck for ' + this.chartId + '  currently drawing, so ignoring request');
  	    }
  	  } else {
        //console.log('periodicCheck for ' + this.chartId + '  next draw time not reached');
      }
  	} else {
        //console.log('periodicCheck for ' + this.chartId + '  nextTimeToDraw is null');
    }
  	this.doingPeriodicCheck = false;
  }
  "
  return script
end

#chart_data_load_script(chart_data_list) ⇒ Object

def params_for_chart(chart_data)

params_str = "var params = '' + "

chart_data.ajax_params.each do |name, value|
#  params_string += "#{name}=#{value}&"
  if (value.to_s.start_with? "VAR|")
    params_str += "'#{name}=' + #{value[4..(value.length - 1)]}"
  else
    encoded_value = URI.encode_www_form([[name, value]])
    params_str += "'#{encoded_value}'"
    #params_str += "'#{name}=#{encoded_value}'"
  end
  params_str += "+'&'+"
end

params_str = params_str[0..params_str.length - 6]
params_str += ';'
# if (params_string.length > 0)
#   params_string = params_string[0..params_string.length - 2]
# end
# params_string = URI.encode_www_form(params)
return params_str

end



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# File 'lib/object_view/high_chart_ajax_javascript.rb', line 320

def chart_data_load_script(chart_data_list)
  script = ""
 	chart_data_list.each do |chart_data|  
    
  
    script += 
    "
              var chartElementId = '#{chart_data.id}';
              $.ajax({
                type: 'GET',
                url: '#{chart_data.ajax_url}',
                data: params,
                dataType: 'text',
                success: function(response) {
                  //alert('Response: ' + response);
                  var chartData = jQuery.parseJSON(response);
                  //alert('Response: ' + response);
                  $('#' + chartElementId).highcharts(chartData);"
                  
    
    if (chart_data.ajax_refresh_seconds != nil)                    
      script += "              
                  makeChartDrawRequest(#{chart_data.ajax_refresh_seconds * 1000});
          "        
    end
                  
    script += "
                },
                error: function(XMLHttpRequest, textStatus, errorThrown) {
                  $('#' + chartElementId).html('<h3>Error getting chart data - QA server may be down.</h3>');
                }
              });
    "
   end
   return script    
end

#clear_script_for_each_chart(chart_data_list) ⇒ Object 



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# File 'lib/object_view/high_chart_ajax_javascript.rb', line 240

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

#draw_chart_function(ajax_refresh_seconds, chart_data_list) ⇒ Object 



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# File 'lib/object_view/high_chart_ajax_javascript.rb', line 203

def draw_chart_function(ajax_refresh_seconds, chart_data_list)
  script = "
    function drawHighChart() {
        console.log('drawHighChart called');
    "
    script += "
        try {
            _currentlyDrawing = true;
            console.log('Drawing charts.');
            //alert('drawHighChart()');
            "
  script +=  "     #{chart_data_load_script(chart_data_list)}\n" 
  
  if (ajax_refresh_seconds != nil)   
    script += "     
             console.log('finished drawing chart.  Queuing another drawHighChart request.');
             makeChartDrawRequest(#{ajax_refresh_seconds * 1000});\n
             _currentlyDrawing = false;
    "
  end
    
  script += "    
        }  catch(error) {
           console.log('Exception drawing chart: ' + error);
           _currentlyDrawing = false;
           makeChartDrawRequest(1000);
        }
        "
        
  script +=   "
        _currentlyDrawing = false;
      }
   "
   return script
end

#params_for_chart(chart_data) ⇒ Object 



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# File 'lib/object_view/high_chart_ajax_javascript.rb', line 286

def params_for_chart(chart_data)
  params_str = "var params = new Object();\n"

  chart_data.ajax_params.each do |name, value|
      params_str += "     params['#{name}'] = '#{value}';\n"
  end
  
  return params_str
end

#periodic_check_function(chart_data_list) ⇒ Object 



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# File 'lib/object_view/high_chart_ajax_javascript.rb', line 249

def periodic_check_function(chart_data_list)
  script = "
  function periodicCheck(chartId) {
      var now = jQuery.now();
      if (_nextTimeToDraw[chartId] != null) {
        if (now > _nextTimeToDraw[chartId]) {
          _doingPeriodicCheck = false;
          if (_currentlyDrawing == false) {
            _nextTimeToDraw[chartId] = null;
            drawHighChart(chartId);
          } else {
          }
        }
      }
      _doingPeriodicCheck = false;
    }
  }
  "
  
  script += 
  "
  function periodicCheckAll() {
    if (!_doingPeriodicCheck) {
      _doingPeriodicCheck = true;
      "
      
  chart_data_list.each do |chart_data|
    script += "   periodicCheck('#{chart_data.id}'); "
  end    
      
  script +=    
      "
    }
  }
  "
end