IDBDatabase: close event
The close
event is fired on IDBDatabase
when the database connection is unexpectedly closed. This could happen, for example, if the underlying storage is removed or if the user clears the database in the browser's history preferences.
Note that it is not fired if the database connection is closed normally using IDBDatabase.close()
.
Syntax
Use the event name in methods like addEventListener()
, or set an event handler property.
js
addEventListener("close", (event) => {});
onclose = (event) => {};
Event type
A generic Event
.
Examples
This example opens a database and listens for the close
event:
js
// Open the database
const dBOpenRequest = window.indexedDB.open("toDoList", 4);
dBOpenRequest.onupgradeneeded = (event) => {
const db = event.target.result;
// 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 });
};
dBOpenRequest.onsuccess = (event) => {
const db = dBOpenRequest.result;
db.addEventListener("close", () => {
console.log("Database connection closed");
});
};
The same example, using the onclose
property instead of addEventListener()
:
js
// Open the database
const dBOpenRequest = window.indexedDB.open("toDoList", 4);
dBOpenRequest.onupgradeneeded = (event) => {
const db = event.target.result;
// 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 });
};
dBOpenRequest.onsuccess = (event) => {
const db = dBOpenRequest.result;
db.onclose = () => {
console.log("Database connection closed");
};
};
Browser compatibility
BCD tables only load in the browser