From 6b8c2062ef2f76f77e373e0264b4d3c5e9ded316 Mon Sep 17 00:00:00 2001
From: xenofem <xenofem@xeno.science>
Date: Sat, 16 Apr 2022 02:49:35 -0400
Subject: [PATCH] save date range in URL

---
 static/poopGraph.js | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/static/poopGraph.js b/static/poopGraph.js
index dac4192..eeb0c62 100644
--- a/static/poopGraph.js
+++ b/static/poopGraph.js
@@ -1,3 +1,10 @@
+const hash = window.location.hash.substring(1);
+if (hash !== "") {
+    const [start, end] = hash.split(":");
+    document.getElementById('startDate').value = start;
+    document.getElementById('endDate').value = end;
+}
+
 fetch('/data.json')
     .then(resp => resp.json())
     .then(plot)
@@ -239,10 +246,23 @@ function plot(data) {
         options.scales.x.min = e.target.value;
         northChart.update();
         southChart.update();
+        updateHash();
     });
     document.getElementById('endDate').addEventListener('input', (e) => {
         options.scales.x.max = e.target.value;
         northChart.update();
         southChart.update();
+        updateHash();
     });
 }
+
+function updateHash() {
+    console.log("updating hash");
+    const start = document.getElementById('startDate').value;
+    const end = document.getElementById('endDate').value;
+    if (start !== "" || end !== "") {
+        window.location.hash = start + ":" + end;
+    } else {
+        window.location.hash = "";
+    }
+}