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Very Simple IndexedDB Example
// quite untested, adapted from BigstickCarpet's gist, attempt to make it simpler to use
function openIndexedDB (fileindex) {
// This works on all devices/browsers, and uses IndexedDBShim as a final fallback
var indexedDB = window.indexedDB || window.mozIndexedDB || window.webkitIndexedDB || window.msIndexedDB || window.shimIndexedDB;
var openDB = indexedDB.open("MyDatabase", 1);
openDB.onupgradeneeded = function() {
var db = {}
db.result = openDB.result;
db.store = db.result.createObjectStore("MyObjectStore", {keyPath: "id"});
if (fileindex) db.index = db.store.createIndex("NameIndex", fileindex);
};
return openDB;
}
function getStoreIndexedDB (openDB) {
var db = {};
db.result = openDB.result;
db.tx = db.result.transaction("MyObjectStore", "readwrite");
db.store = db.tx.objectStore("MyObjectStore");
db.index = db.store.index("NameIndex");
return db;
}
function saveIndexedDB (filename, filedata, fileindex) {
var openDB = openIndexedDB(fileindex);
openDB.onsuccess = function() {
var db = getStoreIndexedDB(openDB);
db.store.put({id: filename, data: filedata});
}
return true;
}
function findIndexedDB (filesearch, callback) {
return loadIndexedDB(null, callback, filesearch);
}
function loadIndexedDB (filename, callback, filesearch) {
var openDB = openIndexedDB();
openDB.onsuccess = function() {
var db = getStoreIndexedDB(openDB);
var getData;
if (filename) {
getData = db.store.get(filename);
} else {
getData = db.index.get(filesearch);
}
getData.onsuccess = function() {
callback(getData.result.data);
};
db.tx.oncomplete = function() {
db.result.close();
};
}
return true;
}
function example () {
var fileindex = ["name.last", "name.first"];
saveIndexedDB(12345, {name: {first: "John", last: "Doe"}, age: 42});
saveIndexedDB(67890, {name: {first: "Bob", last: "Smith"}, age: 35}, fileindex);
loadIndexedDB(12345, callbackJohn);
findIndexedDB(["Smith", "Bob"], callbackBob);
}
function callbackJohn (filedata) {
console.log(filedata.name.first);
}
function callbackBob (filedata) {
console.log(filedata.name.first);
}
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