add small modules for page visibility api and notification apis

2016-07-06 22:16:17 +02:00
parent 13bea89269
commit 73d2b6561a
2 changed files with 147 additions and 0 deletions
--- a/www/common/visible.js
+++ b/www/common/visible.js
@@ -0,0 +1,47 @@
+(function () {
+    // Set the name of the hidden property and the change event for visibility
+    var hidden, visibilityChange; 
+    if (typeof document.hidden !== "undefined") { // Opera 12.10 and Firefox 18 and later support 
+        hidden = "hidden";
+        visibilityChange = "visibilitychange";
+    } else if (typeof document.mozHidden !== "undefined") {
+        hidden = "mozHidden";
+        visibilityChange = "mozvisibilitychange";
+    } else if (typeof document.msHidden !== "undefined") {
+        hidden = "msHidden";
+        visibilityChange = "msvisibilitychange";
+    } else if (typeof document.webkitHidden !== "undefined") {
+        hidden = "webkitHidden";
+        visibilityChange = "webkitvisibilitychange";
+    }
+
+    var Visible = {
+        hidden: hidden,
+        visibilityChange: visibilityChange,
+    };
+
+    var isSupported = Visible.isSupported = function () {
+        return !(typeof(document.addEventListener) === "undefined" ||
+            typeof document[hidden] === "undefined");
+    };
+
+    var onChange = Visible.onChange = function (f) {
+        document.addEventListener(visibilityChange, function (ev) {
+            f(!document[hidden], ev);
+        }, false);
+    };
+
+    var currently = Visible.currently = function () {
+        return !document[hidden];
+    };
+
+    if (typeof(module) !== 'undefined' && module.exports) {
+        module.exports = Visible;
+    } else if ((typeof(define) !== 'undefined' && define !== null) && (define.amd !== null)) {
+        define(function () {
+            return Visible;
+        });
+    } else {
+        window.Visible = Visible;
+    }
+}());