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| try {
var SpeechRecognition = window.SpeechRecognition || window.webkitSpeechRecognition;
var recognition = new SpeechRecognition();
}
catch(e) {
console.error(e);
$('.no-browser-support').show();
$('.app').hide();
}
var noteTextarea = $('#appreciation');
var instructions = $('#recording-instructions');
var notesList = $('ul#notes');
var noteContent = '';
var notes = getAllNotes();
renderNotes(notes);
/*-----------------------------
Voice Recognition
------------------------------*/
// If false, the recording will stop after a few seconds of silence.
// When true, the silence period is longer (about 15 seconds),
// allowing us to keep recording even when the user pauses.
recognition.continuous = true;
// This block is called every time the Speech APi captures a line.
recognition.onresult = function(event) {
// event is a SpeechRecognitionEvent object.
// It holds all the lines we have captured so far.
// We only need the current one.
var current = event.resultIndex;
// Get a transcript of what was said.
var transcript = event.results[current][0].transcript;
// Add the current transcript to the contents of our Note.
// There is a weird bug on mobile, where everything is repeated twice.
// There is no official solution so far so we have to handle an edge case.
var mobileRepeatBug = (current == 1 && transcript == event.results[0][0].transcript);
if(!mobileRepeatBug) {
noteContent += transcript;
noteTextarea.val(noteContent);
}
};
recognition.onstart = function() {
instructions.text('Voice recognition activated. Try speaking into the microphone.');
}
recognition.onspeechend = function() {
instructions.text('You were quiet for a while so voice recognition turned itself off.');
}
recognition.onerror = function(event) {
if(event.error == 'no-speech') {
instructions.text('No speech was detected. Try again.');
};
}
/*-----------------------------
App buttons and input
------------------------------*/
$('#start-record-btn').on('click', function(e) {
if (noteContent.length) {
noteContent += ' ';
}
recognition.start();
});
$('#pause-record-btn').on('click', function(e) {
recognition.stop();
instructions.text('Voice recognition paused.');
});
// Sync the text inside the text area with the noteContent variable.
noteTextarea.on('input', function() {
noteContent = $(this).val();
})
$('#save-note-btn').on('click', function(e) {
recognition.stop();
if(!noteContent.length) {
instructions.text('Could not save empty note. Please add a message to your note.');
}
else {
// Save note to localStorage.
// The key is the dateTime with seconds, the value is the content of the note.
saveNote(new Date().toLocaleString(), noteContent);
// Reset variables and update UI.
noteContent = '';
renderNotes(getAllNotes());
noteTextarea.val('');
instructions.text('Note saved successfully.');
}
})
notesList.on('click', function(e) {
e.preventDefault();
var target = $(e.target);
// Listen to the selected note.
if(target.hasClass('listen-note')) {
var content = target.closest('.note').find('.content').text();
readOutLoud(content);
}
// Delete note.
if(target.hasClass('delete-note')) {
var dateTime = target.siblings('.date').text();
deleteNote(dateTime);
target.closest('.note').remove();
}
});
/*-----------------------------
Speech Synthesis
------------------------------*/
function readOutLoud(message) {
var speech = new SpeechSynthesisUtterance();
// Set the text and voice attributes.
speech.text = message;
speech.volume = 1;
speech.rate = 1;
speech.pitch = 1;
window.speechSynthesis.speak(speech);
}
/*-----------------------------
Helper Functions
------------------------------*/
function renderNotes(notes) {
var html = '';
if(notes.length) {
notes.forEach(function(note) {
html+= `<li class="note">
<p class="header">
<span class="date">${note.date}</span>
<a href="#" class="listen-note" title="Listen to Note">Listen to Note</a>
<a href="#" class="delete-note" title="Delete">Delete</a>
</p>
<p class="content">${note.content}</p>
</li>`;
});
}
else {
html = '<li><p class="content">You don\'t have any notes yet.</p></li>';
}
notesList.html(html);
}
function saveNote(dateTime, content) {
localStorage.setItem('note-' + dateTime, content);
}
function getAllNotes() {
var notes = [];
var key;
for (var i = 0; i < localStorage.length; i++) {
key = localStorage.key(i);
if(key.substring(0,5) == 'note-') {
notes.push({
date: key.replace('note-',''),
content: localStorage.getItem(localStorage.key(i))
});
}
}
return notes;
}
function deleteNote(dateTime) {
localStorage.removeItem('note-' + dateTime);
} |
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