IDBKeyRange class

The interface of the IndexedDB API represents a continuous interval over some data type that is used for keys. Records can be retrieved from IDBObjectStore and IDBIndex objects using keys or a range of keys. You can limit the range using lower and upper bounds. For example, you can iterate over all values of a key in the value range A–Z. A key range can be a single value or a range with upper and lower bounds or endpoints. If the key range has both upper and lower bounds, then it is bounded; if it has no bounds, it is unbounded. A bounded key range can either be open (the endpoints are excluded) or closed (the endpoints are included). To retrieve all keys within a certain range, you can use the following code constructs:

Range Code

All keys ≥ x (x)

All keys > x (x, true)

All keys ≤ y (y)

All keys < y (y, true)

All keys ≥ x && ≤ y (x, y)

All keys > x &&< y (x, y, true, true)

All keys > x && ≤ y (x, y, true, false)

All keys ≥ x &&< y (x, y, false, true)

The key = z (z)

A key is in a key range if the following conditions are true:

The lower value of the key range is one of the following:

void Less than key value Equal to key value if lowerOpen is false.

The upper value of the key range is one of the following:

void Greater than key value Equal to key value if upperOpen is false.

Note: This feature is available in Web Workers