Very Simple IndexedDB Example

IndexedDB101.js

// 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;

// Open (or create) the database
var open = indexedDB.open("MyDatabase", 1);

// Create the schema
open.onupgradeneeded = function() {
    var db = open.result;
    var store = db.createObjectStore("MyObjectStore", {keyPath: "id"});
    var index = store.createIndex("NameIndex", ["name.last", "name.first"]);
};

open.onsuccess = function() {
    // Start a new transaction
    var db = open.result;
    var tx = db.transaction("MyObjectStore", "readwrite");
    var store = tx.objectStore("MyObjectStore");
    var index = store.index("NameIndex");

    // Add some data
    store.put({id: 12345, name: {first: "John", last: "Doe"}, age: 42});
    store.put({id: 67890, name: {first: "Bob", last: "Smith"}, age: 35});
    
    // Query the data
    var getJohn = store.get(12345);
    var getBob = index.get(["Smith", "Bob"]);

    getJohn.onsuccess = function() {
        console.log(getJohn.result.name.first);  // => "John"
    };

    getBob.onsuccess = function() {
        console.log(getBob.result.name.first);   // => "Bob"
    };

    // Close the db when the transaction is done
    tx.oncomplete = function() {
        db.close();
    };
}

thank you very much

Thanks 👍

Thanks 👍

GREAT JOB BUDDY, WHAT dfahlander SAID, ITS TRUE, BUT IT' S A GREAT DEMO

It's a great demo.

@Shikha-shakarwar I think window.caches better fits your requirement
https://googlechrome.github.io/samples/service-worker/window-caches/

thanks for Simply example, this will help me in understanding the interaction with the database!

I am currently writing some IndexedDB code and it occurred to me I have no idea how registering the onsuccess AFTER calling the store.get() works. Is there a delay before firing the on success event? Isn't this a race condition?

Finally, 1 small page with explanation how to work it properly.

This was the best and most easy to read code and tutorial I could find. The only thing I am trying to figure out is now is trying to update a row?

thanks for these awesome snippets .. :)

awesome snippet!

great one thanks :)

thanks very readable snippet

Oh! this was supper easy to understand. Thank you!

Thanks 👍

hi I have a small challenge. can you please explain how to apply this to a situation where you are fetching data from an API? I mean the "add some data" part.

Thank you!! :D

Thanks✌️

Amazing! Thnx! :D

Thank you very much

Awesome :)

I have a comment, which is more of a question. You execute four operations against the store (two writes and two reads). The database is closed when the transaction is completed. From what I there is a high risk that the database will be closed before one of the operations is actually completed. Am I right or am I missing something?

I have a comment, which is more of a question. You execute four operations against the store (two writes and two reads). The database is closed when the transaction is completed. From what I there is a high risk that the database will be closed before one of the operations is actually completed. Am I right or am I missing something?

This one could answer your question:
https://stackoverflow.com/questions/34915581/indexeddb-when-to-close-a-connection

Thanks