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blocked (IndexedDB)

The blocked handler is executed when an open connection to a database is blocking a versionchange transaction on the same database.

General info

Specification
IndexedDB
Interface
IDBVersionChangeEvent
Bubbles
No
Cancelable
No
Target
IDBRequest
Default Action
None

Properties

Property Type Description
target Read only EventTarget The request concerned by this event.
type Read only DOMString The type of event.
bubbles Read only Boolean Whether the event normally bubbles or not.
cancelable Read only Boolean Whether the event is cancellable or not.
newVersion Read only unsigned long (int) The new version of the database.
oldVersion Read only unsigned long (int) The old version of the database.

Example

var req1 = indexedDB.open("addressbook", 3);
 
req1.onsuccess = function( event ) {
  var addressbookDB = event.target.result;
  
  // Let's try to open the same database with a higher revision version
  var req2 = indexedDB.open("addressbook", 4);
  
  // In this case the onblocked handler will be executed
  req2.onblocked = function( e ) {
    console.log(e)
  };
 
};

See also

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https://developer.mozilla.org/en-US/docs/Web/Events/blocked_indexedDB