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src/ui/PurchaseGraph.vue

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+<template>
+  <div>
+    <canvas ref="purchase-chart" width="100" height="50"></canvas>
+  </div>
+</template>
+
+<script>
+import Chartjs from "chart.js";
+
+export default {
+  async mounted() {
+    let canvas = this.$refs["purchase-chart"].getContext("2d");
+
+    console.log(canvas);
+    let _response = await fetch(
+      "http://localhost:30030/api/purchase/statistics"
+    );
+    let response = await _response.json();
+    let labels = [];
+    let blue = {
+      label: "Blå",
+      borderColor: "#4bcffa",
+      backgroundColor: "#4bcffa42",
+      data: []
+    };
+    let yellow = {
+      label: "Gul",
+      borderColor: "#ffdd59",
+      backgroundColor: "#ffdd5942",
+      data: []
+    };
+    let red = {
+      label: "Rød",
+      borderColor: "#ef5777",
+      backgroundColor: "#ef577742",
+      data: []
+    };
+    let green = {
+      label: "Grønn",
+      borderColor: "#0be881",
+      backgroundColor: "#0be88142",
+      data: []
+    };
+
+    let highestNumber = 0;
+
+    for (let i = 0; i < response.length; i++) {
+      let thisDate = response[i];
+      let dateObject = new Date(thisDate.date);
+      labels.push(this.getPrettierDateString(dateObject));
+
+      blue.data.push(thisDate.blue);
+      yellow.data.push(thisDate.yellow);
+      red.data.push(thisDate.red);
+      green.data.push(thisDate.green);
+
+      if (thisDate.blue > highestNumber) {
+        highestNumber = thisDate.blue;
+      }
+      if (thisDate.yellow > highestNumber) {
+        highestNumber = thisDate.yellow;
+      }
+      if (thisDate.green > highestNumber) {
+        highestNumber = thisDate.green;
+      }
+      if (thisDate.red > highestNumber) {
+        highestNumber = thisDate.red;
+      }
+    }
+    let datasets = [blue, yellow, green, red];
+    let chartdata = {
+      labels: labels,
+      datasets: datasets
+    };
+    let chart = new Chart(canvas, {
+      type: "line",
+      data: chartdata,
+      options: {
+        title: {
+          display: true,
+          text: "Antall kjøp"
+        },
+        scales: {
+          yAxes: [
+            {
+              ticks: {
+                beginAtZero: true,
+                suggestedMax: highestNumber + 5
+              }
+            }
+          ]
+        }
+      }
+    });
+  },
+  methods: {
+    getPrettierDateString(date) {
+      return `${date.getDate()}.${date.getMonth() + 1}.${date.getFullYear()}`;
+    }
+  }
+};
+</script>
+
+<style lang="scss" scoped></style>