From 6d13edf314000ebd927de19b537ffc40a5bc5625 Mon Sep 17 00:00:00 2001
From: Mitchell Robert Vollger <mrvollger@gmail.com>
Date: Thu, 10 Mar 2022 19:01:38 -0800
Subject: [PATCH] Adding the position to the url as zoom events happen. Makes
 it easy to share you current view with others.

---
 SafFire.js |  1 +
 lib.js     | 15 ++++++++++++++-
 2 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/SafFire.js b/SafFire.js
index 6577d6c..6e7d199 100644
--- a/SafFire.js
+++ b/SafFire.js
@@ -337,6 +337,7 @@ function miropeats_d3(data) {
         var st = Math.max(0, Math.round(xz.domain()[0]));
         var en = Math.min(aln_data[0].c1_len, Math.round(xz.domain()[1]));
         var coords = `${t_name}:${d3.format(",")(st + 1)}-${d3.format(",")(en)}`;
+        set_url_hash_elm("pos", `${t_name}:${st}-${en}`, false);
         d3.selectAll('.coordinates').remove();
         // define the coordinate box
         var coordinates = d3.select("body").append("div")
diff --git a/lib.js b/lib.js
index 21d10df..30477b1 100644
--- a/lib.js
+++ b/lib.js
@@ -16,6 +16,19 @@ function get_url_elm(tag) {
     return val;
 }
 
+function set_url_hash_elm(tag, val, trigger_event = true) {
+    const parsedHash = new URLSearchParams(
+        window.location.hash.substr(1) // skip the first char (#)
+    );
+    parsedHash.set(tag, val);
+    var newHash = parsedHash.toString();
+    if (trigger_event) {
+        window.location.hash = newHash;
+    } else {
+        history.replaceState(null, null, document.location.pathname + '#' + newHash);
+    }
+}
+
 function set_default_hash() {
     if (window.location.hash == "") {
         window.location.hash = "#dataset=default&ref=CHM13_v1.1&query=CHM1";
@@ -31,7 +44,7 @@ function set_default_hash() {
 }
 
 function set_user_hash() {
-    window.location.hash = "#ref=USER_REF&query=USER_QUERY";
+    window.location.hash = "#dataset=USER&ref=USER_REF&query=USER_QUERY";
 }
 
 function sleep(ms) {