iveAudio is LiveConnect aware. You use JavaScript to control embedded LiveAudio
elements.
Using LiveConnect, LiveAudio, and JavaScript, you can
accomplish the following type of things programmatically:
-
-
Create alternative sound control interfaces
-
Defer the load of a sound file until the user clicks the "play" button
-
Create buttons that make "clicking" noises
-
Create audio confirmation for interface interactions; for example, have an
object "say" what it does when the users clicks it or moves the mouse over
it
Essentially, any event that can be described programmatically
using the already rich JavaScript framework can trigger a sound event.
LiveAudio provides the following major JavaScript controlling
methods. For these methods to be available to JavaScript (and the web page),
you must embed a LiveAudio console (any console will do, it can even be hidden)
somewhere on your page. (Note: Expressions placed in "{}" are comments and
should not be placed in JavaScript literally.)
-
-
play({loop[TRUE, FALSE or an INT]}, '{url_to_sound}')
-
pause()
-
stop()
-
StopAll()
-
start_time({number of seconds})
-
end_time({number of seconds})
-
setvol({percentage number - without "%" sign})
-
fade_to({volume percent you wish to fade to - without the "%" sign})
-
fade_from_to({volume percent start fade}, {volume percent end fade})
-
start_at_beginning()
-
stop_at_end()
The following JavaScript state indication methods do not
control the LiveAudio plug-in, but they give you information about the current
state of the plug-in:
-
-
IsReady
-
IsPlaying
-
IsPaused
-
GetVolume
One example of using JavaScript to control a LiveAudio
plug-in is to have JavaScript play a sound. In the following example, all
of the HTML is needed to make the plug-in play a sound.
<HTML>
<BODY>
<EMBED SRC="sound1.wav"
HIDDEN=TRUE>
<A HREF="javascript:document.embeds[0].play(false)">
Play the sound now!</A>
</BODY>
</HTML>
The preceding method of playing a sound file is probably
the simplest, but can pose many problems. If you are using the
document.embeds array, Navigator 2.0 will generate an error, because
the embeds array is a Navigator 3.0 feature. Rather than use the
embeds array, you can identify the particular <EMBED> tag you
would like to use in JavaScript by using the NAME and MASTERSOUND attributes
in your original <EMBED> tag, as follows:
<HTML>
<BODY>
<EMBED SRC="sound1.wav"
HIDDEN=TRUE
NAME="firstsound"
MASTERSOUND>
<A HREF="javascript:document.firstsound.play(false)">
Play the sound now!</A>
</BODY>
</HTML>
This is a much more descriptive way to describe your plug-in
in JavaScript, and can go a long way towards eliminating confusion. If, for
example you had several sounds embedded in an HTML document, it may be easier
for developers to use the NAME attribute rather than the embeds array.
In the preceding example, notice that the MASTERSOUND attribute in the
<EMBED> tag is used. This is because any time a NAME attribute is used
referencing LiveAudio, an accommodating MASTERSOUND tag must be present as
well.
Another common example of using LiveConnect and LiveAudio
is to defer loading a sound until a user clicks the "play" button. To do
this, try the following:
<HTML>
<HEAD>
<SCRIPT LANGUAGE=JavaScript>
<!-- Hide JavaScript from older browsers
function playDeferredSound() {
document.firstsound.play(false, 'http://url_to_new_sound_file/sound1.wav');
}
// -->
</SCRIPT>
</HEAD>
<BODY>
<EMBED
SRC="stub1.wav"
HIDDEN=TRUE
NAME="firstsound"
MASTERSOUND>
<A HREF="javascript:playDeferredSound()">Load and play the sound</A>
</BODY>
</HTML>
The stub file, stub1.wav, is loaded relatively
quickly. (For a description of how to create a stub file, see the EmeraldNet
LiveAudio information at http://emerald.net/liveaudio/.) The play
method then loads the sound file only when it is called. Using this example,
the sound file is loaded only when the user wants to hear it.
Web designers might want to create entire new interfaces
with LiveConnected LiveAudio. To create an alternate console for sound playing
and interaction, a designer might do the following:
<HTML>
<HEAD>
<SCRIPT LANGUAGE=JavaScript>
<!-- Hide JavaScript from older browsers
function playSound() {
document.firstSound.play(false);
}
function pauseSound() {
document.firstSound.pause();
}
function stopSound() {
document.firstSound.stop();
}
function volup() {
currentVolume = document.firstSound.GetVolume();
newVolume = ( currentVolume + 10 ) ;
if ( document.firstSound.GetVolume() == 100 ) {
alert("Volume is already at maximum");
}
if ( newVolume < 90 ) {
document.firstSound.setvol(newVolume) ;
}
else
{
if ( ( newVolume <= 100 ) && ( newVolume > 90 ) ) {
document.firstSound.setvol(100) ;
}
}
}
function voldown() {
currentVolume = document.firstSound.GetVolume();
newVolume = ( currentVolume - 10 ) ;
if ( document.firstSound.GetVolume() == 0 ) {
alert("Volume is already at minimum");
}
if ( newVolume > 10 ) {
document.firstSound.setvol(newVolume) ;
}
else
{
if ( ( newVolume >= 0 ) && ( newVolume < 10 ) ) {
document.firstSound.setvol(0) ;
}
}
}
// -->
</SCRIPT>
</HEAD>
<BODY>
<EMBED
SRC="sound1.wav"
HIDDEN=TRUE
AUTOSTART=FALSE
NAME="firstSound"
MASTERSOUND>
<P><A HREF="javascript:playSound()">Play the sound now!</A></P>
<P><A HREF="javascript:pauseSound()">Pause the sound now!</A></P>
<P><A HREF="javascript:stopSound()">Stop the sound now!</A></P>
<P><A HREF="javascript:volup()">Increment the Volume!</A></P>
<P><A HREF="javascript:voldown()">Decrement the Volume!</A></P>
</BODY>
</HTML>
The preceding example illustrates how you might create
your own method of controlling a sound file. The possibilities are really
endless; you can use images and onClick event handlers to simulate your own
sound player.
| file: /Techref/language/java/SCRIPT/liveaud.htm, 9KB, , updated: 2009/2/2 13:27, local time: 2024/12/11 19:47,
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