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# File 'lib/rgviz_rails/view_helper.rb', line 3
def rgviz(options = {})
def opts_to_json(opts, special_keys)
@s = '{'
i = 0
opts.each do |key, value|
key = key.to_s.gsub('"', '\"')
@s << ',' if i > 0
@s << "\"#{key}\":"
if value.kind_of? Array
@s << '['
value.each_with_index do |val, i|
@s << ',' if i > 0
if val.kind_of? String
val = val.gsub('"', '\"')
@s << "\"#{val}\""
else
@s << val.to_s
end
end
@s << ']'
elsif special_keys.include?(key) || !value.kind_of?(String)
@s << value.to_s
else
value = value.gsub('"', '\"')
@s << "\"#{value}\""
end
i += 1
end
@s << '}'
end
options = options.with_indifferent_access
id = options[:id]
kind = options[:kind]
url = options[:url]
query = options[:query] || ''
events = options[:events] || {}
html = options[:html] || {}
hidden = options[:hidden]
extensions = options[:extensions]
rgviz_events, google_events = events.partition{|x| x.to_s.start_with? 'rgviz'}
rgviz_events = rgviz_events.inject(Hash.new){|h, y| h[y[0]] = y[1]; h}
rgviz_events = rgviz_events.with_indifferent_access
html_prefix = (options[:html_prefix] || 'html').to_s
js_prefix = (options[:js_prefix] || 'js').to_s
param_prefix = (options[:param_prefix] || 'param').to_s
html_prefix += '_'
js_prefix += '_'
param_prefix += '_'
debug = options[:debug]
opts = options[:options] || {}
opts[:width] = 640 unless opts[:width]
opts[:height] = 480 unless opts[:height]
params = []
uses_rgviz_get_value = false
uses_rgviz_append = false
visitor = MagicNamesVisitor.new(html_prefix, js_prefix, param_prefix)
special_keys = []
opts.each do |key, value|
next unless value.kind_of?(String)
source = visitor.get_source(value, false)
next unless source[:source]
special_keys << key
case source[:source]
when :html
opts[key] = "rgviz_get_value('#{source[:id]}')"
uses_rgviz_get_value = true
when :js
opts[key] = "#{source[:id]}()"
when :param
opts[key] = "param_#{source[:id]}"
params << source[:id].to_i unless params.include?(source[:id])
end
end
opts = opts_to_json(opts, special_keys)
raise "Must specify an :id" unless id
raise "Must specify a :kind" unless kind
raise "Must specify a :url" unless url
url = url_for url
query = Parser.parse query, :extensions => extensions
query.accept visitor
query_builder = visitor.query_builder
query_builder_var = visitor.query_builder_var
uses_rgviz_get_value |= visitor.uses_rgviz_get_value?
uses_rgviz_append |= visitor.uses_rgviz_append?
visitor.params.each{|p| params << p unless params.include?(p)}
params = params.sort!.map{|i| "param_#{i}"}
out = ''
@first_time ||= 1
if @first_time == 1
out << "<script type=\"text/javascript\" src=\"http://www.google.com/jsapi\"></script>\n"
end
out << "<script type=\"text/javascript\">\n"
if uses_rgviz_get_value && !@defined_rgviz_get_value
out << "function rgviz_get_value(id) {\n"
out << "var e = document.getElementById(id);\n"
out << "var n = e.tagName.toLowerCase();\n"
out << "var s = null;\n"
out << "if (n == 'select' && e.multiple) {\n"
out << "var s = [];\n"
out << "var o = e.options;\n"
out << "for(var i = 0; i < o.length; i++)\n"
out << "if (o[i].selected) s.push(o[i].value);\n"
out << "} else if (n == 'input' && e.type.toLowerCase() == 'checkbox') {\n"
out << "s = [e.checked];\n"
out << "} else {\n"
out << "s = [e.value];\n"
out << "}\n"
out << "return s;\n"
out << "}\n"
@defined_rgviz_get_value = true
end
if uses_rgviz_append && !@defined_rgviz_append
out << "function rgviz_append(s, b, a) {\n"
out << "var q = '';\n"
out << "if (s.length == 0) {\n"
out << "q += '1 = 2';\n";
out << "} else {\n"
out << "if (s.length > 1) q += '(';\n"
out << "for(var i = 0; i < s.length; i++) {\n";
out << "if (i > 0) q += ' or ';\n"
out << "q += b + s[i] + a;\n"
out << "}";
out << "if (s.length > 1) q += ')';\n"
out << "}\n"
out << "return q;\n"
out << "}\n"
@defined_rgviz_append = true
end
pack = kind.downcase
@packages ||= []
unless @packages.include?(pack)
out << "google.load(\"visualization\", \"1\", {'packages':['#{pack}']});\n"
@packages << pack
end
callback = "rgviz_draw_#{id}"
if !hidden && params.empty?
out << "google.setOnLoadCallback(#{callback});\n"
end
out << "var rgviz_#{id} = null;\n"
out << "var rgviz_#{id}_data = null;\n"
out << "function #{callback}(#{params.join(', ')}) {\n"
out << "#{rgviz_events[:rgviz_start]}('#{id}');\n" if rgviz_events[:rgviz_start]
out << "var query = new google.visualization.Query('#{url}');\n"
out << "#{query_builder}\n"
out << "alert(#{query_builder_var});\n" if debug
out << "query.setQuery(#{query_builder_var});\n"
out << "query.send(function(response) {\n"
out << "rgviz_#{id} = new google.visualization.#{kind}(document.getElementById('#{id}'));\n"
google_events.each do |name, handler|
out << "google.visualization.events.addListener(rgviz_#{id}, '#{name}', #{handler});\n"
end
out << "rgviz_#{id}_data = response.getDataTable();\n"
out << "rgviz_#{id}.draw(rgviz_#{id}_data, #{opts});\n"
out << "#{rgviz_events[:rgviz_end]}('#{id}');\n" if rgviz_events[:rgviz_end]
out << "});\n"
out << "}\n"
out << "</script>\n"
out << "<div id=\"#{id}\""
html.each do |key, value|
out << " #{key}=\"#{h value}\""
end
out << "></div>\n"
@first_time = 0
if Rails::VERSION::MAJOR == 2
out
else
raw out
end
end
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