Failed to execute 'createObjectStore' on 'IDBDatabase'

Question

why do I have a error ?

My code:

var idb = window.indexedDB ||      // Use the standard DB API           window.mozIndexedDB ||   // Or Firefox's early version of it           window.webkitIndexedDB;  // Or Chrome's early version  var IDBTransaction = window.IDBTransaction || window.webkitIDBTransaction; var IDBKeyRange = window.IDBKeyRange || window.webkitIDBKeyRange;  var dbName='nameDb';  var idbRequest=idb.open(dbName,'4.67' /*,dbDescription  */);  idbRequest.onsuccess=function (e) {     debugger      var db=e.target.result;       if (!db.objectStoreNames.contains('chat')){         co=db.createObjectStore('chat',{'id':100});     };      if (!db.objectStoreNames.contains('iam')){         co1=db.createObjectStore('iam');     };  };  idbRequest.onerror = function (e) {     debugger }; 

Uncaught InvalidStateError: Failed to execute 'createObjectStore' on 'IDBDatabase': The database is not running a version change transaction. index.html:37 idbRequest.onsuccess

Answer 1

You can't create an objectStore in an onsuccess method. You can only do this in a upgradeneeded event.

Quote from docs:

When you create a new database or increase the version number of an existing database (by specifying a higher version number than you did previously, when Opening a database), the onupgradeneeded event will be triggered. In the handler for this event, you should create the object stores needed for this version of the database

See documentation.