Embedding Sound in Web Pages, Part I: Audio Control Example Code - Doc JavaScript

Audio Control Example Code

Here is the code for the example on the previous page:

<SCRIPT LANGUAGE="JavaScript">
<!--
var NSsound = navigator.plugins && navigator.plugins["LiveAudio"];
var IEsound = navigator.plugins && document.all;
var audioEnabled = NSsound || IEsound;
if (!audioEnabled)
  document.write("Your browser does not support
   JavaScript-enabled audio control"); // join with previous line
if (!navigator.javaEnabled()) alert("Your browser is not Java-enabled.
Please edit preferences.");
onload = init;
timerID = null;
function init() {
  if (!navigator.javaEnabled()) return;
  if (!audioEnabled) return;
  document.display.soundcard.value = (IEsound) ?
document.audiopanel.isSoundCardEnabled() : "not supported";
  document.display.filename.value = (IEsound) ?
document.audiopanel.fileName : "not supported";
  endTime = (IEsound) ? 
document.audiopanel.selectionEnd : "not supported"; // global variable
  document.display.position.value =
    (IEsound) ? Math.floor(document.audiopanel.currentPosition) : 
       "not supported"; // join with previous line
  state();
}
function showPosition() {
  if (!navigator.javaEnabled()) return;
  if (!audioEnabled) return;
  document.display.position.value = (IEsound) ?
Math.floor(document.audiopanel.currentPosition) : "not supported";
  setTimeout("showPosition()", 1000);
}
function playIt() {
  if (!navigator.javaEnabled()) return;
  if (!audioEnabled) return;
  if (IEsound) document.audiopanel.play()
  else if (NSsound) document.audiopanel.play(true);
  state();
  timerID = setTimeout("showPosition()", 1000);
}
function stopIt() {
  if (!navigator.javaEnabled()) return;
  if (!audioEnabled) return;
  document.audiopanel.stop();
  state();
  clearInterval(timerID);
}
function pauseIt() {
  if (!navigator.javaEnabled()) return;
  if (!audioEnabled) return;
  document.audiopanel.pause();
  state();
  clearInterval(timerID);
}
function state() {
  if (!navigator.javaEnabled()) return;
  var field = document.display.state;
  if (IEsound) {
    var cur = document.audiopanel.currentState;
    if (cur == 0) field.value = "stopped";
    if (cur == 1) field.value = "paused";
    if (cur == 2) field.value = "playing";
  } else if (NSsound) {
      if (document.audiopanel.IsReady()) field.value = "stopped";
      if (document.audiopanel.IsPlaying()) field.value = "playing";
      if (document.audiopanel.IsPaused()) field.value = "paused";
  }
}
function toggleControls() {
  if (!navigator.javaEnabled()) return;
  if (IEsound)
    document.audiopanel.showControls = !document.audiopanel.showControls;
}
function startAtGivenSec(sec) {
  if (!navigator.javaEnabled()) return;
  if (IEsound)
    document.audiopanel.selectionStart = sec
  else if (NSsound)
         document.audiopanel.start_time(sec);
}
function stopAtGivenSec(sec) {
  if (!navigator.javaEnabled()) return;
  if (IEsound)
    document.audiopanel.selectionEnd = sec
  else if (NSsound)
    document.audiopanel.end_time(sec);
}
function stopAtEnd() {
  if (!navigator.javaEnabled()) return;
  if (IEsound)
    document.audiopanel.selectionEnd = endTime
  else if (NSsound)
    document.audiopanel.stop_at_end();
}
function decreaseVolume() {
  if (!navigator.javaEnabled()) return;
  if (IEsound)
    document.audiopanel.volume -= 10
  else if (NSsound)
    document.audiopanel.setvol(parseInt(document.audiopanel.GetVolume() - 10))
}
function increaseVolume() {
  if (!navigator.javaEnabled()) return;
  if (IEsound)
    document.audiopanel.volume += 10
  else if (NSsound)
    document.audiopanel.setvol(document.audiopanel.GetVolume() + 10)
}
function setDefaultVolume() {
  if (!navigator.javaEnabled()) return;
  if (IEsound)
    document.audiopanel.volume = 50
  else if (NSsound)
    document.audiopanel.setvol(50)
}
if (audioEnabled)
  document.write("<EMBED NAME='audiopanel' SRC='aladdin.mid' MASTERSOUND
    HEIGHT='60' WIDTH='144' HIDDEN='false'>") //join with previous line
else
  document.write("Your browser cannot play sound files.");
</SCRIPT>
<FORM NAME="display">
Sound card enabled: <INPUT TYPE="text" NAME="soundcard" SIZE="14"><BR>
State: <INPUT TYPE="text" NAME="state" SIZE="10"><BR>
Position: <INPUT TYPE="text" NAME="position" SIZE="14"><BR>
Filename: <INPUT TYPE="text" NAME="filename" SIZE="50"><BR>
<INPUT TYPE="button" VALUE="Play" onClick="playIt()">
<INPUT TYPE="button" VALUE="Pause" onClick="pauseIt()">
<INPUT TYPE="button" VALUE="Stop" onClick="stopIt()"><BR>
<INPUT TYPE="button" VALUE="Toggle Controls" onClick="toggleControls()"><BR>
<INPUT TYPE="button" VALUE="Start @ 10 Second" onClick="startAtGivenSec(10)">
<INPUT TYPE="button" VALUE="Stop @ 30 Second" onClick="stopAtGivenSec(30)"><BR>
<INPUT TYPE="button" VALUE="Start @ 0 Second" onClick="startAtGivenSec(0)">
<INPUT TYPE="button" VALUE="Stop @ End of Track" onClick="stopAtEnd()"><BR>
<INPUT TYPE="button" VALUE="<=====" onClick="decreaseVolume()">
<INPUT TYPE="button" VALUE="==^==" onClick="setDefaultVolume()">
<INPUT TYPE="button" VALUE="=====>" onClick="increaseVolume()"><BR>
</FORM>