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

includes(key)

Parameters

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

Return value

A boolean value.

Exceptions

This method may raise a DOMException of the following type:

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

Examples

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 # ref-for-dom-idbkeyrange-includes①

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
`includes`	52	79	47	No	39	10.1	52	52	47	41	10.3	6.0

Name	Web APIs
Version
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Last Updated	2022-04-27T09:33:08Z