1 files changed, 30 insertions, 0 deletions
diff --git a/web/src/js/utils.js b/web/src/js/utils.js
index 21b7a868..459b18f3 100644
--- a/web/src/js/utils.js
+++ b/web/src/js/utils.js
@@ -58,6 +58,35 @@ var formatTimeStamp = function (seconds) {
     return ts.replace("T", " ").replace("Z", "");
 };
 
+function EventEmitter() {
+    this.listeners = {};
+}
+EventEmitter.prototype.emit = function (event) {
+    if (!(event in this.listeners)) {
+        return;
+    }
+    var args = Array.prototype.slice.call(arguments, 1);
+    this.listeners[event].forEach(function (listener) {
+        listener.apply(this, args);
+    }.bind(this));
+};
+EventEmitter.prototype.addListener = function (events, f) {
+    events.split(" ").forEach(function (event) {
+        this.listeners[event] = this.listeners[event] || [];
+        this.listeners[event].push(f);
+    }.bind(this));
+};
+EventEmitter.prototype.removeListener = function (events, f) {
+    if (!(events in this.listeners)) {
+        return false;
+    }
+    events.split(" ").forEach(function (event) {
+        var index = this.listeners[event].indexOf(f);
+        if (index >= 0) {
+            this.listeners[event].splice(index, 1);
+        }
+    }.bind(this));
+};
 
 function getCookie(name) {
     var r = document.cookie.match("\\b" + name + "=([^;]*)\\b");
@@ -84,6 +113,7 @@ $(document).ajaxError(function (event, jqXHR, ajaxSettings, thrownError) {
 });
 
 module.exports = {
+    EventEmitter: EventEmitter,
     formatSize: formatSize,
     formatTimeDelta: formatTimeDelta,
     formatTimeStamp: formatTimeStamp,