IDBKeyRange: only() static method

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since September 2021.

Note: This feature is available in Web Workers.

The only() static method of the IDBKeyRange interface creates a new key range containing a single value.

Syntax

js
IDBKeyRange.only(value)

Parameters

value

The value for the new key range.

Return value

IDBKeyRange: The newly created key range.

Exceptions

DataError DOMException

Thrown if the value parameter was not a valid key.

Examples

The following example illustrates how you'd use an only key range. Here we declare a keyRangeValue = IDBKeyRange.only("A"); — a range that only includes the value "A". We open a transaction (using IDBTransaction) and an object store, and open a Cursor with IDBObjectStore.openCursor, declaring keyRangeValue as its optional key range value. This means that the cursor will only retrieve the record with the key value "A".

Note: For a more complete example allowing you to experiment with key range, have a look at our IDBKeyRange repo (view the example live too.)

js
function displayData() {
  const keyRangeValue = IDBKeyRange.only("A");

  const transaction = db.transaction(["fThings"], "readonly");
  const objectStore = transaction.objectStore("fThings");

  objectStore.openCursor(keyRangeValue).onsuccess = (event) => {
    const cursor = event.target.result;
    if (cursor) {
      const listItem = document.createElement("li");
      listItem.textContent = `${cursor.value.fThing}, ${cursor.value.fRating}`;
      list.appendChild(listItem);

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

Specifications

Specification
Indexed Database API 3.0
# ref-for-dom-idbkeyrange-only①

Browser compatibility

Report problems with this compatibility data on GitHub
desktopmobile
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
lowerBound() static method

Legend

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Full support
Full support

See also