Add messages to message area when a player joins or leaves the game

[lmno.games] / empires / empires-client.js

diff --git a/empires/empires-client.js b/empires/empires-client.js
index bb8a41f2fa96354aef293228846342b260833ff7..3d528e08ba1e4efbee827b04a3c166c2ec90cd25 100644 (file)
--- a/empires/empires-client.js
+++ b/empires/empires-client.js
@@ -13,13 +13,8 @@ ${message}
   message_area.insertAdjacentHTML('beforeend', message);
 }
 
-function register_loaded(name) {
-  add_message("success", name + " is now in the game!");
-}
-
 function register(form) {
   var request = new XMLHttpRequest();
-  request.addEventListener("load", register_loaded(form.name.value));
 
   request.open("POST", API + "register");
   request.setRequestHeader("Content-Type", "application/json; charset=UTF-8");
@@ -31,3 +26,53 @@ function register(form) {
 
   form.reset();
 }
+
+const events = new EventSource(API + "events");
+
+events.onerror = function(event) {
+  if (event.target.readyState === EventSource.CLOSED) {
+      add_message("danger", "Connection to server lost.");
+  }
+};
+
+events.addEventListener("players", function(event) {
+  const players_element = document.getElementById("players");
+  const players = JSON.parse(event.data);
+
+  players_element.innerHTML = '';
+  for (const player of players) {
+    var li = document.createElement('li');
+    li.id = "player-" + player.id;
+    li.innerText = player.name;
+    players_element.appendChild(li);
+  }
+});
+
+events.addEventListener("player-join", function(event) {
+  const players = document.getElementById("players");
+  const player = JSON.parse(event.data);
+
+  const li = document.createElement('li');
+  li.id = "player-" + player.id;
+  li.innerText = player.name;
+  players.appendChild(li);
+
+  add_message("success", player.name + " is now in the game!");
+});
+
+events.addEventListener("player-leave", function(event) {
+  const players = document.getElementById("players");
+  const id = JSON.parse(event.data);
+  const player = document.getElementById("player-" + id.id);
+
+  add_message("info", player.innerText + " has left the game.");
+  players.removeChild(player);
+});
+
+events.addEventListener("capture", function(event_string) {
+  const players = document.getElementById("players");
+  const event = JSON.parse(event_string.data);
+  const player = document.getElementById("player-" + event.captee);
+
+  players.removeChild(player);
+});