edlp_d8/libraries/wavesurfer/example/microphone/app.js

'use strict';

// Create an instance
var wavesurfer;

// Init & load
document.addEventListener('DOMContentLoaded', function () {
    var micBtn = document.querySelector('#micBtn');

    // Init wavesurfer
    wavesurfer = WaveSurfer.create({
        container     : '#waveform',
        waveColor     : 'black',
        interact      : false,
        cursorWidth   : 0,
        plugins: [
            WaveSurfer.microphone.create()
        ]
    });

    wavesurfer.microphone.on('deviceReady', function() {
        console.info('Device ready!');
    });
    wavesurfer.microphone.on('deviceError', function(code) {
        console.warn('Device error: ' + code);
    });

    // start/stop mic on button click
    micBtn.onclick = function() {
        if (wavesurfer.microphone.active) {
            wavesurfer.microphone.stop();
        } else {
            wavesurfer.microphone.start();
        }
    };
});