Custom tooltip and labels.

components/PageviewsChart.js

@@ -1,9 +1,49 @@
-import React, { useRef, useEffect } from 'react';
+import React, { useState, useRef, useEffect, useCallback } from 'react';
 import ChartJS from 'chart.js';
+import { format } from 'date-fns';
+import styles from './PageviewsChart.module.css';
 
-export default function PageviewsChart({ data }) {
+export default function PageviewsChart({ data, unit }) {
   const canvas = useRef();
   const chart = useRef();
+  const [tooltip, setTooltip] = useState({});
+
+  const renderLabel = useCallback(
+    (label, index, values) => {
+      const d = new Date(values[index].value);
+      switch (unit) {
+        case 'day':
+          if (data.pageviews.length > 7) {
+            return index % 2 !== 0 ? format(d, 'MMM d') : '';
+          }
+          return format(d, 'EEE M/d');
+        default:
+          return label;
+      }
+    },
+    [unit, data],
+  );
+
+  const renderTooltip = model => {
+    const { caretX, caretY, opacity, title, body, labelColors } = model;
+    console.log(model);
+
+    if (!opacity) {
+      setTooltip({ opacity });
+    } else {
+      const [label, value] = body[0].lines[0].split(':');
+
+      setTooltip({
+        top: caretY,
+        left: caretX,
+        opacity,
+        title: title[0],
+        value,
+        label,
+        labelColor: labelColors[0].backgroundColor,
+      });
+    }
+  };
 
   function draw() {
     if (!canvas.current) return;
@@ -17,16 +57,16 @@ export default function PageviewsChart({ data }) {
               label: 'unique visitors',
               data: data.uniques,
               lineTension: 0,
-              backgroundColor: 'rgb(146, 86, 217, 0.2)',
-              borderColor: 'rgb(122, 66, 191, 0.3)',
+              backgroundColor: 'rgb(146, 86, 217, 0.4)',
+              borderColor: 'rgb(122, 66, 191, 0.4)',
               borderWidth: 1,
             },
             {
               label: 'page views',
               data: data.pageviews,
               lineTension: 0,
-              backgroundColor: 'rgb(38, 128, 235, 0.2)',
-              borderColor: 'rgb(13, 102, 208, 0.3)',
+              backgroundColor: 'rgb(38, 128, 235, 0.4)',
+              borderColor: 'rgb(13, 102, 208, 0.4)',
               borderWidth: 1,
             },
           ],
@@ -36,7 +76,8 @@ export default function PageviewsChart({ data }) {
             duration: 300,
           },
           tooltips: {
-            intersect: false,
+            enabled: false,
+            custom: renderTooltip,
           },
           hover: {
             animationDuration: 0,
@@ -46,16 +87,18 @@ export default function PageviewsChart({ data }) {
               {
                 type: 'time',
                 distribution: 'series',
-                offset: true,
                 time: {
-                  displayFormats: {
-                    day: 'ddd M/DD',
+                  unit,
+                  tooltipFormat: 'ddd MMMM DD YYYY',
                 },
-                  tooltipFormat: 'ddd M/DD hA',
+                ticks: {
+                  callback: renderLabel,
+                  maxRotation: 0,
                 },
                 gridLines: {
                   display: false,
                 },
+                offset: true,
                 stacked: true,
               },
             ],
@@ -71,8 +114,16 @@ export default function PageviewsChart({ data }) {
         },
       });
     } else {
-      chart.current.data.datasets[0].data = data.uniques;
-      chart.current.data.datasets[1].data = data.pageviews;
+      const {
+        data: { datasets },
+        options,
+      } = chart.current;
+
+      datasets[0].data = data.uniques;
+      datasets[1].data = data.pageviews;
+      options.scales.xAxes[0].time.unit = unit;
+      options.scales.xAxes[0].ticks.callback = renderLabel;
+
       chart.current.update();
     }
   }
@@ -84,8 +135,21 @@ export default function PageviewsChart({ data }) {
   }, [data]);
 
   return (
-    <div>
+    <div className={styles.chart}>
       <canvas ref={canvas} width={960} height={400} />
+      <Tootip {...tooltip} />
     </div>
   );
 }
+
+const Tootip = ({ top, left, opacity, title, value, label, labelColor }) => (
+  <div className={styles.tooltip} style={{ top, left, opacity }}>
+    <div className={styles.content}>
+      <div className={styles.title}>{title}</div>
+      <div className={styles.metric}>
+        <div className={styles.dot} style={{ backgroundColor: labelColor }} />
+        {value} {label}
+      </div>
+    </div>
+  </div>
+);

components/PageviewsChart.module.css

@@ -0,0 +1,56 @@
+.chart {
+  position: relative;
+}
+
+.tooltip {
+  opacity: 0;
+  position: absolute;
+  pointer-events: none;
+}
+
+.content {
+  display: flex;
+  flex-direction: column;
+  justify-content: center;
+  align-items: center;
+  color: #000;
+  text-shadow: -1px -1px 0 #fff, 1px -1px 0 #fff, -1px 1px 0 #fff, 1px 1px 0 #fff;
+  text-align: center;
+  width: 150px;
+  height: 50px;
+  transform: translate(-50%, -60px);
+}
+
+.content:after {
+  content: '';
+  position: absolute;
+  top: 0;
+  left: 0;
+  right: 0;
+  bottom: 0;
+  margin: auto;
+  background: #000;
+  opacity: 0.05;
+  border-radius: 10px;
+}
+
+.title {
+  font-size: 12px;
+  font-weight: 600;
+}
+
+.metric {
+  display: flex;
+  justify-content: center;
+  align-items: center;
+  font-size: 14px;
+  font-weight: 600;
+}
+
+.dot {
+  width: 10px;
+  height: 10px;
+  border-radius: 100%;
+  border: 1px solid #fff;
+  margin-right: 10px;
+}

components/WebsiteStats.js

@@ -34,7 +34,7 @@ export default function WebsiteStats({ websiteId, startDate, endDate, unit }) {
   return (
     <div>
       <WebsiteSummary data={{ pageviews, uniques }} />
-      <PageviewsChart data={{ pageviews, uniques }} />
+      <PageviewsChart data={{ pageviews, uniques }} unit={unit} />
     </div>
   );
 }