files/en-us/web/api/idbcursor/source/index.md
{{APIRef("IndexedDB")}} {{AvailableInWorkers}}
The source read-only property of the
{{domxref("IDBCursor")}} interface returns the {{domxref("IDBObjectStore")}} or
{{domxref("IDBIndex")}} that the cursor is iterating over. This function never returns
null or throws an exception, even if the cursor is currently being iterated, has
iterated past its end, or its transaction is not active.
The {{domxref("IDBObjectStore")}} or {{domxref("IDBIndex")}} that the cursor is iterating over.
In this simple fragment we create a transaction, retrieve an object store, then use a cursor to iterate through all the records in the object store. Within each iteration we log the source of the cursor, which will log our {{domxref("IDBObjectStore")}} object to the console.
The cursor does not require us to select the data based
on a key; we can just grab all of it. Also note that in each iteration of the loop,
you can grab data from the current record under the cursor object using cursor.value.foo. For a complete working example, see our IDBCursor example (View the example live).
function displayData() {
const transaction = db.transaction(["rushAlbumList"], "readonly");
const objectStore = transaction.objectStore("rushAlbumList");
objectStore.openCursor().onsuccess = (event) => {
const cursor = event.target.result;
if (cursor) {
const listItem = document.createElement("li");
listItem.textContent = `${cursor.value.albumTitle}, ${cursor.value.year}`;
list.appendChild(listItem);
console.log(cursor.source);
cursor.continue();
} else {
console.log("Entries all displayed.");
}
};
}
{{Specifications}}
{{Compat}}