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    SpeechRecognition.lang

    This is an experimental technology
    Because this technology's specification has not stabilized, check the compatibility table for the proper prefixes to use in various browsers. Also note that the syntax and behavior of an experimental technology is subject to change in future versions of browsers as the spec changes.

    The lang property of the SpeechRecognition interface returns and sets the language of the current SpeechRecognition. If not specified, this defaults to the HTML lang attribute value, or the user agent's language setting if that isn't set either.

    SyntaxEdit

    var myLang = mySpeechRecognition.lang;
mySpeechRecognition.lang = 'en-US';

    Value

    A DOMString representing the BCP 47 language tag for the current SpeechRecognition.

    ExamplesEdit

    This code is excerpted from our Speech color changer example.

    var grammar = '#JSGF V1.0; grammar colors; public <color> = aqua | azure | beige | bisque | black | blue | brown | chocolate | coral | crimson | cyan | fuchsia | ghostwhite | gold | goldenrod | gray | green | indigo | ivory | khaki | lavender | lime | linen | magenta | maroon | moccasin | navy | olive | orange | orchid | peru | pink | plum | purple | red | salmon | sienna | silver | snow | tan | teal | thistle | tomato | turquoise | violet | white | yellow ;'
var recognition = new SpeechRecognition();
var speechRecognitionList = new SpeechGrammarList();
speechRecognitionList.addFromString(grammar, 1);
recognition.grammars = speechRecognitionList;
//recognition.continuous = false;
recognition.lang = 'en-US';
recognition.interimResults = false;
recognition.maxAlternatives = 1;

...

    SpecificationsEdit

    Specification Status Comment
    Web Speech API
    The definition of 'lang' in that specification.    		 Draft  

    Browser compatibilityEdit

    Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
    Basic support 33 [1] 44 (44) [2] Not supported Not supported Not supported
    • [1] Speech recognition interfaces are currently prefixed on Chrome, so you'll need to prefix interface names appropriately, e.g. webkitSpeechRecognition; You'll also need to serve your code through a web server for recognition to work.
    • [2] Can be enabled via the media.webspeech.recognition.enable flag in about:config, although note that currently speech recognition won't work on Desktop Firefox — it will be properly exposed soon, once the required internal permissions are sorted out.

    Firefox OS permissions

    To use speech recognition in an app, you need to specify the following permissions in your manifest:

    "permissions": {
  "audio-capture" : {
    "description" : "Audio capture"
  },
  "speech-recognition" : {
    "description" : "Speech recognition"
  }
}

    You also need a privileged app, so you need to include this as well:

    "type": "privileged"

    See alsoEdit

    Document Tags and Contributors

    Tags: 
     Contributors to this page: chrisdavidmills
     Last updated by: chrisdavidmills,