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IDBCursor: continue() method

The continue() method of the IDBCursor interface advances the cursor to the next position along its direction, to the item whose key matches the optional key parameter. If no key is specified, the cursor advances to the immediate next position, based on its direction.

Note: This feature is available in Web Workers

Syntax

js

continue()
continue(key)

Parameters

key Optional

The key to position the cursor at.

Return value

None (undefined).

Exceptions

This method may raise a DOMException of one of the following types:

TransactionInactiveError DOMException

Thrown if this IDBCursor's transaction is inactive.

DataError DOMException

Thrown if the key parameter has any of the following conditions:

  • The key is not a valid key.
  • The key is less than or equal to this cursor's position, and the cursor's direction is next or nextunique.
  • The key is greater than or equal to this cursor's position and this cursor's direction is prev or prevunique.
InvalidStateError DOMException

Thrown if the cursor is currently being iterated or has iterated past its end.

Examples

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. 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).

js

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);

      cursor.continue();
    } else {
      console.log("Entries all displayed.");
    }
  };
}

Specifications

Browser compatibility

Desktop Mobile
Chrome Edge Firefox Internet Explorer Opera Safari WebView Android Chrome Android Firefox for Android Opera Android Safari on IOS Samsung Internet
continue 23 12 10 10 15 8 4.4 25 22 14 8 1.5

See also

© 2005–2023 MDN contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/API/IDBCursor/continue