SpeechGrammarList

The SpeechGrammarList interface of the Web Speech API represents a list of SpeechGrammar objects containing words or patterns of words that we want the recognition service to recognize.

Grammar is defined using JSpeech Grammar Format (JSGF.) Other formats may also be supported in the future.

SpeechGrammarList()

Creates a new SpeechGrammarList object.

SpeechGrammarList.length Read only

Returns the number of SpeechGrammar objects contained in the SpeechGrammarList.

SpeechGrammarList.item()

Standard getter — allows individual SpeechGrammar objects to be retrieved from the SpeechGrammarList using array syntax.

SpeechGrammarList.addFromURI()

Takes a grammar present at a specific URI and adds it to the SpeechGrammarList as a new SpeechGrammar object.

SpeechGrammarList.addFromString()

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.

In our simple Speech color changer example, we create a new SpeechRecognition object instance using the SpeechRecognition() constructor, create a new SpeechGrammarList, add our grammar string to it using the SpeechGrammarList.addFromString method, and set it to be the grammar that will be recognized by the SpeechRecognition instance using the SpeechRecognition.grammars property.

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;

• Web Speech API