IDBObjectStore: indexNames property
Note: This feature is available in Web Workers.
The indexNames
read-only property of the
IDBObjectStore
interface returns a list of the names of indexes on objects
in this object store.
Value
Examples
In the following code snippet, we open a read/write transaction on our database and add
some data to an object store using add()
. After the object store has been
created, we log objectStore.indexNames
to the console. For a full working example, see
our To-do Notifications app
(view example live).
js
// Let us open our database
const DBOpenRequest = window.indexedDB.open("toDoList", 4);
DBOpenRequest.onsuccess = (event) => {
note.appendChild(document.createElement("li")).textContent =
"Database initialized.";
// store the result of opening the database in the db variable.
// This is used a lot below
db = this.result;
// Run the addData() function to add the data to the database
addData();
};
function addData() {
// Create a new object ready to insert into the IDB
const newItem = [
{
taskTitle: "Walk dog",
hours: 19,
minutes: 30,
day: 24,
month: "December",
year: 2013,
notified: "no",
},
];
// open a read/write db transaction, ready for adding the data
const transaction = db.transaction(["toDoList"], "readwrite");
// report on the success of the transaction completing, when everything is done
transaction.oncomplete = (event) => {
note.appendChild(document.createElement("li")).textContent =
"Transaction completed.";
};
transaction.onerror = (event) => {
note.appendChild(document.createElement("li")).textContent =
"Transaction not opened due to error. Duplicate items not allowed.";
};
// create an object store on the transaction
const objectStore = transaction.objectStore("toDoList");
console.log(objectStore.indexNames);
// Make a request to add our newItem object to the object store
const objectStoreRequest = objectStore.add(newItem[0]);
objectStoreRequest.onsuccess = (event) => {
// report the success of our request
note.appendChild(document.createElement("li")).textContent =
"Request successful.";
};
}
Specifications
Specification |
---|
Indexed Database API 3.0 # ref-for-dom-idbobjectstore-indexnames① |
Browser compatibility
BCD tables only load in the browser
See also
- 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).