Baseline Widely available
Note: This feature is available in Web Workers.
The upperOpen read-only property of the IDBKeyRange interface returns a boolean indicating whether the upper-bound value is included in the key range.
A boolean value:
Value Indicationtrue The upper-bound value is not included in the key range. false The upper-bound value is included in the key range. Examples
The following example illustrates how you'd use a key range. Here we declare keyRangeValue = IDBKeyRange.upperBound("F", "W", true, true); â a range that includes everything between "F" and "W" but not including them â since both the upper and lower bounds have been declared as open (true). 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.
After declaring the key range, we log its upperOpen property value to the console, which should appear as "true": the upper bound is open, so won't be included in the range.
Note: For a more complete example allowing you to experiment with key range, have a look at our IDBKeyRange-example repo (view the example live too.)
function displayData() {
const keyRangeValue = IDBKeyRange.bound("F", "W", true, true);
console.log(keyRangeValue.upperOpen);
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.");
}
};
}
IDBDatabaseIDBTransactionIDBKeyRangeIDBObjectStoreIDBCursorRetroSearch is an open source project built by @garambo | Open a GitHub Issue
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