javascript - How can I play audio elements in sync with key presses? -

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html

<textarea id="words" name="words"></textarea> <audio id="type" src="type.mp3"></audio>

js

document.getelementbyid('words').onkeydown = function(){     document.getelementbyid('type').play(); }

i want make type.mp3 play anytime press key.

but, not played in sync key.

i looking pure js solution.

the audio media element depends on buffering mechanism of browser , may not play instantly when play called.

to play sounds in sync key-presses have use web audio api instead allows play in-memory buffer , therefor instantly.

here example of how can load , trigger sound:

window.audiocontext = window.audiocontext || window.webkitaudiocontext;    var request = new xmlhttprequest(),      url = "https://dl.dropboxusercontent.com/s/8fp1hnkwp215gfs/chirp.wav",      actx = new audiocontext(),      abuffer;    // load file via xhr  request.open("get", url, true);  request.responsetype = "arraybuffer";  request.onload = function() {    // asynchronously decode audio file data in request.response    actx.decodeaudiodata(request.response,      function(buffer) {        if (buffer) {          abuffer = buffer; // keep reference decoded buffer          setup();          // setup handler        }      }    )  };  request.send();      // setup key handler  function setup() {    document.getelementbyid("txt").onkeydown = play;  }      // play sample - new buffer source must created each time  function play() {    var src = actx.createbuffersource();    src.buffer = abuffer;    src.connect(actx.destination);    src.start(0);  }
<textarea id=txt></textarea>

(note: there seem bug in firefox @ time of writing reporting column not exist in code @ send() call - if problem, try code in chrome).


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