add a better tooltip on LE-LLE biplot hover

Former-commit-id: 6378ccdbda7ae16cb76c2d4ce35a96e06cbccf23

ippisite/ippidb/templates/base.html

@@ -113,7 +113,7 @@
                       backgroundColor: "rgba(211,211,211, 0.5)",
                       data: otherFamiliesData
                     },
-                    { label: '{{ compound.best_activity_ppi_name}} family',
+                    { label: compoundFamily,
                       borderColor: "rgba(54, 162, 235, 1)",
                       backgroundColor: "rgba(54, 162, 235, 0.5)",
                       data: currentFamilyData
@@ -134,6 +134,14 @@
                                 type: 'linear',
                                 position: 'bottom'
                             }]
+                        },
+                        tooltips: {
+                            callbacks: {
+                                label: function(tooltipItem, data) {
+                                    var dataItem = data.datasets[tooltipItem.datasetIndex].data[tooltipItem.index];
+                                    return "compound " + dataItem.id + " on PPI " + dataItem.family_name;
+                                }
+                            }
                         }
                     }
                 });