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Showing content from https://developer.mozilla.org/en-US/docs/Web/API/IDBRequest/readyState below:

IDBRequest: readyState property - Web APIs

Baseline Widely available

Note: This feature is available in Web Workers.

The readyState read-only property of the IDBRequest interface returns the state of the request.

Every request starts in the pending state. The state changes to done when the request completes successfully or when an error occurs.

One of the following strings:

pending

Returned if the request is still ongoing.

done

Returned if the request has already completed.

The following example requests a given record title, onsuccess gets the associated record from the IDBObjectStore (made available as objectStoreTitleRequest.result), updates one property of the record, and then puts the updated record back into the object store in another request. The readyState of the 2nd request is logged to the developer console. For a full working example, see our To-do Notifications app (View the example live).

const title = "Walk dog";

// Open up a transaction as usual
const objectStore = db
  .transaction(["toDoList"], "readwrite")
  .objectStore("toDoList");

// Get the to-do list object that has this title as its title
const objectStoreTitleRequest = objectStore.get(title);

objectStoreTitleRequest.onsuccess = () => {
  // Grab the data object returned as the result
  const data = objectStoreTitleRequest.result;

  // Update the notified value in the object to "yes"
  data.notified = "yes";

  // Create another request that inserts the item
  // back into the database
  const updateTitleRequest = objectStore.put(data);

  // Log the readyState of this request
  console.log(
    `The readyState of this request is ${updateTitleRequest.readyState}`,
  );

  // When this new request succeeds, run the displayData()
  // function again to update the display
  updateTitleRequest.onsuccess = () => {
    displayData();
  };
};

• Using IndexedDB
• Starting transactions: IDBDatabase
• Using transactions: IDBTransaction
• Setting a range of keys: IDBKeyRange
• Retrieving and making changes to your data: IDBObjectStore
• Using cursors: IDBCursor
• Reference example: To-do Notifications (View the example live).

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