refs #1816 display tooltip which explains percentage value in detail

plugins/CoreHome/templates/_dataTableCell.twig

@@ -21,7 +21,16 @@
 {% endif %}
 {% if row.getMetadata(tooltipIndex) %}</span>{% endif %}
     {% set totals = dataTable.getMetadata('totals') %}
-{% if column in totals|keys and totals[column] -%}
-    <span class="ratio">&nbsp;{{ row.getColumn(column)|percentage(totals[column], 1) }}</span>
+{% if column in totals|keys -%}
+    {% set rowPercentage = row.getColumn(column)|percentage(totals[column], 1) %}
+    {% set totalValue = siteSummary.getFirstRow.getColumn(column) %}
+
+    {% if totalValue %}
+    {% set totalPercentage = row.getColumn(column)|percentage(totalValue, 1) %}
+    {% set secondPartOfTooltip = ['This is ', totalPercentage, ' of all ', totalValue, ' ', translations[column]|default(column)]|join %}
+    {% else %}
+        {% set secondPartOfTooltip = '' %}
+    {% endif %}
+    <span class="ratio" title="'{{ row.getColumn(columns_to_display|first)|e('html_attr') }}' represents {{ rowPercentage|e('html_attr') }} of {{ totals[column]|e('html_attr') }} with {{ translations[columns_to_display|first]|default(columns_to_display|first)|e('html_attr') }}. {{ secondPartOfTooltip }}">&nbsp;{{ rowPercentage }}</span>
 {%- endif %}
 {% endspaceless %}

plugins/CoreVisualizations/Visualizations/HtmlTable.php

@@ -12,6 +12,9 @@ namespace Piwik\Plugins\CoreVisualizations\Visualizations;
 
 use Piwik\Plugin\Visualization;
 use Piwik\View;
+use Piwik\Common;
+use Piwik\Period;
+use Piwik\API\Request as ApiRequest;
 
 /**
  * DataTable visualization that shows DataTable data in an HTML table.
@@ -42,6 +45,16 @@ class HtmlTable extends Visualization
 
             $this->config->show_visualization_only = true;
         }
+
+        // we do not want to get a datatable\map
+        $period = Common::getRequestVar('period', 'day', 'string');
+        if (Period\Range::parseDateRange($period)) {
+            $period = 'range';
+        }
+
+        $request = new ApiRequest(array('method' => 'API.get', 'module' => 'API', 'format' => 'original', 'period' => $period));
+
+        $this->assignTemplateVar('siteSummary', $request->process());
     }
 
 }
\ No newline at end of file