gistfile1.js

(function () {
    // IndexedDB
    var indexedDB = window.indexedDB || window.webkitIndexedDB || window.mozIndexedDB || window.OIndexedDB || window.msIndexedDB,
        IDBTransaction = window.IDBTransaction || window.webkitIDBTransaction || window.OIDBTransaction || window.msIDBTransaction,
        dbVersion = 1.0;

    // Create/open database
    var request = indexedDB.open("elephantFiles", dbVersion),
        db,
        createObjectStore = function (dataBase) {
            // Create an objectStore
            console.log("Creating objectStore")
            dataBase.createObjectStore("images");
        },

        getImageFile = function () {
            // Code for getting images as a blob through WebActivities from Camera, Gallery etc
            // Then:
            putImageInDb(blob);
        },

        putImageInDb = function (blob) {
            console.log("Putting images in IndexedDB");

            // Open a transaction to the database
            var transaction = db.transaction(["images"], IDBTransaction.READ_WRITE);

            // Put the blob into the dabase
            var put = transaction.objectStore("images").put(blob, "image");
        };

    request.onerror = function (event) {
        console.log("Error creating/accessing IndexedDB database");
    };

    request.onsuccess = function (event) {
        console.log("Success creating/accessing IndexedDB database");
        db = request.result;

        db.onerror = function (event) {
            console.log("Error creating/accessing IndexedDB database");
        };
        
        getImageFile();
    }
    
    // For future use. Currently only in latest Firefox versions
    request.onupgradeneeded = function (event) {
        createObjectStore(event.target.result);
    };
})();