Next, we create an event handler to start speaking the text entered into the text field. onresult = function ( event ) Speaking the entered text But it is not needed for this simple demo, so we are just specifying one (which is actually the default anyway.)
This can sometimes be useful, say if a result is not completely clear and you want to display a list if alternatives for the user to choose the correct one from. SpeechRecognition.maxAlternatives: Sets the number of alternative potential matches that should be returned per result.Final results are good enough for this simple demo. SpeechRecognition.interimResults: Defines whether the speech recognition system should return interim results, or just final results.
Setting this is good practice, and therefore recommended.
ntinuous: Controls whether continuous results are captured ( true), or just a single result each time recognition is started ( false).We also set a few other properties of the recognition instance before we move on: We then add the SpeechGrammarList to the speech recognition instance by setting it to the value of the ammars property. We also create a new speech grammar list to contain our grammar, using the SpeechGrammarList() constructor. This is done using the SpeechRecognition() constructor. The next thing to do is define a speech recogntion instance to control the recognition for our application. Plugging the grammar into our speech recognition For this basic demo, we are just keeping things simple. You can have as many terms defined as you want on separate lines following the above structure, and include fairly complex grammar definitions.Note how each is separated by a pipe character. public declares that it is a public rule, the string in angle brackets defines the recognized name for this term ( color), and the list of items that follow the equals sign are the alternative values that will be recognized and accepted as appropriate values for the term. The second line indicates a type of term that we want to recognize.The first line - #JSGF V1.0 - states the format and version used.The lines are separated by semi-colons, just like in JavaScript.However, for now let's just run through it quickly: The grammar format used is JSpeech Grammar Format ( JSGF) - you can find a lot more about it at the previous link to its spec. Refer to the list of VoiceOver keyboard shortcuts in Deque University's resource section for more complete information.Var colors = var grammar = '#JSGF V1.0 grammar colors public = ' + colors. That's enough to get started, but there are many keyboard shortcuts. Navigate through links and form controls: Tab.Show the "Rotor:" Control + Option + U (Then use right/left arrow keys to toggle categories, and down/up arrow keys to select an option).Read one element at a time: Control + Option + Right Arrow.Start reading again: Control + Option + A.Here are some important keyboard shortcuts to remember: For an authentic experience, don't use a mouse or trackpad, because a blind person won't be using those visual methods of navigating. Open up a web page and let VoiceOver read it. To start using VoiceOver, press Command + F5 on the keyboard. VoiceOver also understands ARIA (Accessible Rich Internet Applications) markup, which means it can dynamically communicate the names, states, roles, properties, and relationships of JavaScript widgets to blind users, making interactive web content accessible even as it changes in the browser. You can use VoiceOver to listen to your computer, and to web sites, because VoiceOver converts text to speech. If you own a Mac, you already own a screen reader called VoiceOver, which is built into the operating system.