Initial Commit

data/interfaces/default/js/cacher.js

@@ -0,0 +1,66 @@
+// check if browser supports session storage, if not log error in console.
+if(sessionStorage === null) console.log("Session storage not supported by this browser.");
+
+// get cache object
+var temp = sessionStorage.getItem('cacheObj');
+var cacheObj = $.parseJSON(temp);
+
+// create cache object if it doesn't exist
+if (cacheObj === null) {
+    var cacheObj = new Object();
+}
+
+// setCache function
+// usage: setCache(unique_identifier, data_to_be_cached, minutes_to_remain_cached [optional, default = 60] )
+function setCache(postId, postData, validityTime) {
+
+    validityTime = typeof validityTime !== 'undefined' ? validityTime : 60;
+
+    // get the current time
+    var milliseconds = new Date().getTime();
+
+    if (cacheObj.length > 0) {
+
+        var objectExists = false;
+
+        //check if we already have this data stored and is current
+        for (var i = 0; i < cacheObj.length; i++) {
+            if (cacheObj[i].postId === postId) {
+                objectExists = true;
+            }
+        }
+        // add the data to the object if it's not there already
+        if (!objectExists) {
+            cacheObj.push( { postId: postId, data: postData, expire: (milliseconds + (validityTime * 60 * 1000)) } );
+            sessionStorage.setItem('cacheObj', JSON.stringify(cacheObj));
+        }
+    } else {
+        cacheObj =  [ { postId: postId, data: postData, expire: (milliseconds + (validityTime * 60 * 1000)) } ];
+        sessionStorage.setItem('cacheObj', JSON.stringify(cacheObj));
+    }
+
+};
+
+// getCache function
+// usage: getCache(unique_identifier)
+function getCache(postId) {
+
+    // get the current time
+    var milliseconds = new Date().getTime();
+
+    if (cacheObj.length > 0) {
+        for (var i = 0; i < cacheObj.length; i++) {
+            if (cacheObj[i].postId === postId) {
+                // check if item has expired
+                if (milliseconds < cacheObj[i].expire) {
+                    return cacheObj[i].data;
+                } else {
+                    // if item expired then remove from cache object
+                    console.log('Object expired, destroying.');
+                    cacheObj.splice(i, 1);
+                }
+            }
+        }
+    }
+    return false;
+};