This is an experimental technologyCheck the Browser compatibility table carefully before using this in production.
The addFromString()
method of the SpeechGrammarList
interface takes a grammar present in a specific DOMString
within the code base (e.g. stored in a variable) and adds it to the SpeechGrammarList
as a new SpeechGrammar
object.
Syntax
speechGrammarListInstance.addFromString(string,weight);
Returns
Void.
Parameters
- string
- A
DOMString
representing the grammar to be added. - weight Optional
- A float representing the weight of the grammar relative to other grammars present in the
SpeechGrammarList
. The weight means the importance of this grammar, or the likelihood that it will be recognised by the speech recognition service. The value can be between0.0
and1.0
; If not specified, the default used is1.0
.
Examples
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;
Specifications
Specification | Status | Comment |
Web Speech APIThe definition of 'addFromString()' in that specification. | Draft |
Browser compatibility
The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
Update compatibility data on GitHub
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Chrome Full support 33 Full support 33 Prefixed' Implemented with the vendor prefix: webkit Notes' You'll need to serve your code through a web server for recognition to work. |
Edge Full support ≤79 Full support ≤79 Prefixed' Implemented with the vendor prefix: webkit Notes' You'll need to serve your code through a web server for recognition to work. |
Firefox
No support No |
IE
No support No |
Opera
No support No |
Safari
No support No |
WebView Android Full support Yes Full support Yes Prefixed' Implemented with the vendor prefix: webkit Notes' You'll need to serve your code through a web server for recognition to work. |
Chrome Android Full support Yes Full support Yes Prefixed' Implemented with the vendor prefix: webkit Notes' You'll need to serve your code through a web server for recognition to work. |
Firefox Android
No support No |
Opera Android
No support No |
Safari iOS
No support No |
Samsung Internet Android Full support Yes Full support Yes Prefixed' Implemented with the vendor prefix: webkit Notes' You'll need to serve your code through a web server for recognition to work. |
Legend
- Full support
- Full support
- No support
- No support
- Experimental. Expect behavior to change in the future.'
- Experimental. Expect behavior to change in the future.
- See implementation notes.'
- See implementation notes.
- Requires a vendor prefix or different name for use.'
- Requires a vendor prefix or different name for use.
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 also
SpeechGrammarList.addFromString() by Mozilla Contributors is licensed under CC-BY-SA 2.5.