Web/API/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;
};

Specification

Specification	Status	Comment
Indexed Database API DraftThe definition of 'includes()' in that specification.	Recommendation
Indexed Database API DraftThe definition of 'includes()' in that specification.	Recommendation

Browser compatibility

Update compatibility data on GitHub

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
`includes`	Chrome Full support 52	Edge Full support ≤18	Firefox Full support 47	IE No support No	Opera Full support 39	Safari Full support 10.1	WebView Android Full support 52	Chrome Android Full support 52	Firefox Android Full support Yes	Opera Android Full support 41	Safari iOS Full support 10.3	Samsung Internet Android Full support 6.0

Legend

Full support: Full support
No support: No support