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

IDBRequest: success event - Web APIs

Baseline Widely available

The success event is fired when an IDBRequest succeeds. In the success event handler, you can access the result of the request, as well as place more requests to the same transaction.

This event is not cancelable and does not bubble.

Use the event name in methods like addEventListener(), or set an event handler property.

addEventListener("success", (event) => { })

onsuccess = (event) => { }

A generic Event.

This example tries to open a database and listens for the success event using addEventListener():

// Open the database
const openRequest = window.indexedDB.open("toDoList", 4);

openRequest.onupgradeneeded = (event) => {
  const db = event.target.result;

  db.onerror = () => {
    console.log("Error creating database");
  };

  // Create an objectStore for this database
  const objectStore = db.createObjectStore("toDoList", {
    keyPath: "taskTitle",
  });

  // define what data items the objectStore will contain
  objectStore.createIndex("hours", "hours", { unique: false });
  objectStore.createIndex("minutes", "minutes", { unique: false });
  objectStore.createIndex("day", "day", { unique: false });
  objectStore.createIndex("month", "month", { unique: false });
  objectStore.createIndex("year", "year", { unique: false });
};

openRequest.addEventListener("success", (event) => {
  console.log("Database opened successfully!");
});

The same example, but using the onsuccess event handler property:

// Open the database
const openRequest = window.indexedDB.open("toDoList", 4);

openRequest.onupgradeneeded = (event) => {
  const db = event.target.result;

  db.onerror = () => {
    console.log("Error creating database");
  };

  // Create an objectStore for this database
  const objectStore = db.createObjectStore("toDoList", {
    keyPath: "taskTitle",
  });

  // define what data items the objectStore will contain
  objectStore.createIndex("hours", "hours", { unique: false });
  objectStore.createIndex("minutes", "minutes", { unique: false });
  objectStore.createIndex("day", "day", { unique: false });
  objectStore.createIndex("month", "month", { unique: false });
  objectStore.createIndex("year", "year", { unique: false });
};

openRequest.onsuccess = (event) => {
  console.log("Database opened successfully!");
};

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