feat(dashboard): #82 add chart for sum of account and savings

static/js/dashboard.js

@@ -0,0 +1,38 @@
+// Initialize the echarts instance based on the prepared dom
+
+async function init() {
+	const element = document.getElementById('graph')
+	if (element === null) {
+		return;
+	}
+
+	var myChart = echarts.init(element);
+
+	try {
+		const response = await fetch("/dashboard/dataset");
+		if (!response.ok) {
+			throw new Error(`Response status: ${response.status}`);
+		}
+
+		const option = await response.json();
+		option.tooltip.formatter = function (params) {
+			return new Date(params[0].data[0]).toLocaleString([], { day: 'numeric', month: 'short', year: 'numeric' })  +
+				'<br />' +
+				'Sum of Accounts: <span class="font-bold">' + params[0].data[1] + '</span> € <br />' +
+				'Sum of Savings: <span class="font-bold">' + params[1].data[1] + '</span> €'
+		};
+
+		const chart = myChart.setOption(option);
+		window.addEventListener('resize', function() {
+		myChart.resize();
+	});
+
+	console.log("initialized charts");
+	} catch (error) {
+		console.error(error.message);
+	}
+	
+	// Display the chart using the configuration items and data just specified.
+}
+
+init();