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The Intl
object is the namespace for the ECMAScript Internationalization API, which provides language sensitive string comparison, number formatting, and date and time formatting. The constructors for Collator
, NumberFormat
, and DateTimeFormat
objects are properties of the Intl
object. This page documents these properties as well as functionality common to the internationalization constructors and other language sensitive functions.
Properties
Intl.Collator
- Constructor for collators, objects that enable language sensitive string comparison.
Intl.DateTimeFormat
- Constructor for objects that enable language sensitive date and time formatting.
Intl.NumberFormat
- Constructor for objects that enable language sensitive number formatting.
Methods
Intl.getCanonicalLocales()
- A method returning the canonical locale names.
Locale identification and negotiation
The internationalization constructors as well as several language sensitive methods of other constructors (listed under See also) use a common pattern for identifying locales and determing the one they will actually use: they all accept locales
and options
arguments, and negotiate the requested locale(s) against the locales they support using an algorithm specified in the options.localeMatcher
property.
locales
argument
The locales
argument must be either a string holding a BCP 47 language tag, or an array of such language tags. If the locales
argument is not provided or is undefined, the runtime's default locale is used.
A BCP 47 language tag identifies a language or locale (the difference between the two is fuzzy). In their most common form it can contain, in this order: a language code, a script code, and a country code, all separated by hyphens. Examples:
"hi"
: Hindi."de-AT"
: German as used in Austria."zh-Hans-CN"
: Chinese written in simplified characters as used in China.
The subtags identifying languages, scripts, countries (regions), and (rarely used) variants in BCP 47 language tags can be found in the IANA Language Subtag Registry.
BCP 47 also allows for extensions, and one of them matters to the JavaScript internationalization functions: the "u"
(Unicode) extension. It can be used to request a customization of the locale-specific behavior of a Collator
, NumberFormat
, or DateTimeFormat
object. Examples:
"de-DE-u-co-phonebk"
: Use the phonebook variant of the German sort order, which expands umlauted vowels to character pairs: ä → ae, ö → oe, ü → ue."th-TH-u-nu-thai"
: Use Thai digits (๐, ๑, ๒, ๓, ๔, ๕, ๖, ๗, ๘, ๙) in number formatting."ja-JP-u-ca-japanese"
: Use the Japanese calendar in date and time formatting, so that 2013 is expressed as the year 25 of the Heisei period, or 平成25.
Locale negotiation
The locales
argument, after stripping off all Unicode extensions, is interpreted as a prioritized request from the application. The runtime compares it against the locales it has available and picks the best one available. Two matching algorithms exist: the "lookup"
matcher follows the Lookup algorithm specified in BCP 47; the "best fit"
matcher lets the runtime provide a locale that's at least, but possibly more, suited for the request than the result of the Lookup algorithm. If the application doesn't provide a locales
argument, or the runtime doesn't have a locale that matches the request, then the runtime's default locale is used. The matcher can be selected using a property of the options
argument (see below).
If the selected language tag had a Unicode extension substring, that extension is now used to customize the constructed object or the behavior of the function. Each constructor or function supports only a subset of the keys defined for the Unicode extension, and the supported values often depend on the language tag. For example, the "co"
key (collation) is only supported by Collator
, and its "phonebk"
value is only supported for German.
options
argument
The options
argument must be an object with properties that vary between constructors and functions. If the options
argument is not provided or is undefined, default values are used for all properties.
One property is supported by all language sensitive constructors and functions: The localeMatcher
property, whose value must be a string "lookup"
or "best fit"
and which selects one of the locale matching algorithms described above.
Specifications
Specification | Status | Comment |
---|---|---|
ECMAScript Internationalization API 1.0 (ECMA-402) The definition of 'Intl' in that specification. |
Standard | Initial definition. |
ECMAScript Internationalization API 2.0 (ECMA-402) The definition of 'Intl' in that specification. |
Standard | |
ECMAScript Internationalization API 4.0 (ECMA-402) The definition of 'Intl' in that specification. |
Draft | Added Intl.getCanonicalLocales in the 4th edition. |
Browser compatibility
Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari (WebKit) |
---|---|---|---|---|---|
Basic support | 24 | 29 (29) | 11 | 15 | 10.0 [2] |
Feature | Android | Chrome for Android | Firefox Mobile (Gecko) | IE Phone | Opera Mobile | Safari Mobile |
---|---|---|---|---|---|---|
Basic support | No support | 26 | No support [1] | No support | No support | 10.0 [2] |
[1] Starting with Gecko 44 (Firefox 44 / Thunderbird 44 / SeaMonkey 2.41), the Intl API is available on b2gdroid.
[2] Safari 10.0 Release Notes