Speech Recognition Speech to Text with JavaScript

Speech-to-Text-with-JavaScript

Speech to Text with JavaScript

This article we are going to explore different avenues regarding the Speech Web API. It’s an exceptionally helpful program interface that enables you to record your discourse and convert it into content. We will likewise utilize it to do the inverse – perusing out strings in a human-like voice.

Live Demo   Download Source Code

Index.html

<div class="container">

            <h1>Voice Control Notes App</h1>
            <p class="page-description">A tiny app that allows you to take notes by recording your voice</p>
           

            <h3 class="no-browser-support">Sorry, Your Browser Doesn't Support the Web Speech API. Try Opening This Demo In Google Chrome.</h3>

            <div class="app"> 
                <h3>Add New Note</h3>
                <div class="input-single">
                    <textarea id="note-textarea" placeholder="Create a new note by typing or using voice recognition." rows="6"></textarea>
                </div>         
                <button id="start-record-btn" title="Start Recording">Start Recognition</button>
                <button id="pause-record-btn" title="Pause Recording">Pause Recognition</button>
                <button id="save-note-btn" title="Save Note">Save Note</button>   
                <p id="recording-instructions">Press the <strong>Start Recognition</strong> button and allow access.</p>
                
                <h3>My Notes</h3>
                <ul id="notes">
                    <li>
                        <p class="no-notes">You don't have any notes.</p>
                    </li>
                </ul>

            </div>

        </div>

        <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
        <script src="script.js"></script>

Script.js

try {
  var SpeechRecognition = window.SpeechRecognition || window.webkitSpeechRecognition;
  var recognition = new SpeechRecognition();
}
catch(e) {
  console.error(e);
  $('.no-browser-support').show();
  $('.app').hide();
}


var noteTextarea = $('#note-textarea');
var instructions = $('#recording-instructions');
var notesList = $('ul#notes');

var noteContent = '';

// Get all notes from previous sessions and display them.
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); 
}

Style.css

ul {
    list-style: none;
    padding: 0;
}

p {
    color: #444;
}

button:focus {
    outline: 0;
}

.container {
    max-width: 700px;
    margin: 0 auto;
    padding: 30px 50px;
    text-align: center;
}

.container h1 {
    color: #049fff;
    margin-bottom: 20px;
}

h3 {
    
    color: #049fff;
}



.page-description {
    font-size: 1.1rem;
    margin: 0 auto;
}

.tz-link {
    font-size: 1em;
    color: #1da7da;
    text-decoration: none;
}

.no-browser-support {
    display: none;
    font-size: 1.2rem;
    color: #e64427;
    margin-top: 35px;
}

.app {
    margin: 40px auto;
}

#note-textarea {
    margin: 20px 0;
}

#recording-instructions {
    margin: 15px auto 60px;
}

#notes {
    padding-top: 20px;
}

.note .header {
    font-size: 0.9em;
    color: #888;
    margin-bottom: 10px;
}

.note .delete-note,
.note .listen-note {
    text-decoration: none;
    margin-left: 15px;
}

.note .content {
    margin-bottom: 40px;
}

@media (max-width: 768px) {
    .container {
        padding: 50px 25px;
    }

    button {
        margin-bottom: 10px;
    }

}   



/* -- Demo ads -- */

@media (max-width: 1200px) {
    #bsaHolder{ display:none;}
}


.button, button{
    background-color: #ff3505 !important;
}

 

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