How to Add Speech Recognition to your Website

Add Voice Recognition to your Website

The HTML5 Web Speech API has been around for few years now but it takes slightly more work now to include it in your website.

Earlier, you could add the attribute x-webkit-speech to any form input field and it would become voice capable. The x-webkit-speech attribute has however been deprecated and you are now required to use the JavaScript API to include speech recognition. Here’s the updated code:

<!-- CSS Styles -->
<style>
  .speech {border: 1px solid #DDD; width: 300px; padding: 0; margin: 0}
  .speech input {border: 0; width: 240px; display: inline-block; height: 30px;}
  .speech img {float: right; width: 40px }
</style>

<!-- Search Form -->
<form id="labnol" method="get" action="https://www.google.com/search">
  <div class="speech">
    <input type="text" name="q" id="transcript" placeholder="Speak" />
    <img onclick="startDictation()" src="//i.imgur.com/cHidSVu.gif" />
  </div>
</form>

<!-- HTML5 Speech Recognition API -->
<script>
  function startDictation() {

    if (window.hasOwnProperty('webkitSpeechRecognition')) {

      var recognition = new webkitSpeechRecognition();

      recognition.continuous = false;
      recognition.interimResults = false;

      recognition.lang = "en-US";
      recognition.start();

      recognition.onresult = function(e) {
        document.getElementById('transcript').value
                                 = e.results[0][0].transcript;
        recognition.stop();
        document.getElementById('labnol').submit();
      };

      recognition.onerror = function(e) {
        recognition.stop();
      }

    }
  }
</script>

We have the CSS to place the microphone image inside the input box, the form code containing the input button and the JavaScript that does all the heavy work.

When the user click the mic image inside the search box, the JavaScript checks if the user’s browser supports speech recognition. If so, it waits for the transcribed text to arrive from Google servers and then submits the form.