IDBKeyRange.includes()

The includes() method of the IDBKeyRange interface returns a boolean indicating whether a specified key is inside the key range.

Note: This feature is available in Web Workers

Syntax

var isIncluded = myKeyRange.includes(key)

Parameters

key The key you want to check for in your key range. This can be any type.

Return value

A Boolean.

Exceptions

This method may raise a DOMException of the following type:

Attribute	Description
`DataError`	The supplied key was not a valid key.

Example

var keyRangeValue = IDBKeyRange.bound('A', 'K', false, false);

var myResult = keyRangeValue.includes('F');
// Returns true

var myResult = keyRangeValue.includes('W');
// Returns false

Polyfill

The includes() method was added in the second edition of the Indexed DB specification. For browsers that do not support it, the following polyfill can be used.

IDBKeyRange.prototype.includes = IDBKeyRange.prototype.includes || function(key) {
  var r = this, c;
  if (r.lower !== undefined) {
    c = indexedDB.cmp(key, r.lower);
    if (r.lowerOpen && c <= 0) return false;
    if (!r.lowerOpen && c < 0) return false;
  }
  if (r.upper !== undefined) {
    c = indexedDB.cmp(key, r.upper);
    if (r.upperOpen && c >= 0) return false;
    if (!r.upperOpen && c > 0) return false;
  }
  return true;
};

Specifications

Specification
Indexed Database API 3.0 (Indexed DB 3.0) # ref-for-dom-idbkeyrange-includes①

Browser compatibility

BCD tables only load in the browser