JavaScript Multimedia
The JavaScript navigator object includes a child object called plugins. This object is an array, with one entry for each plug-in installed on the browser. The navigator.plugins object is supported only by Netscape, Firefox and Mozilla only.
Here is an example to list down all the plug-on installed with your browser:
<html>
<head>
<title>List of Plug-Ins</title>
</head>
<body>
<table border="1">
<tr>
<th>Plug-in Name</th>
<th>Filename</th>
<th>Description</th>
</tr>
<script language="JavaScript" type="text/javascript">
for (i=0; i<navigator.plugins.length; i++) {
document.write("<tr><td>");
document.write(navigator.plugins[i].name);
document.write("</td><td>");
document.write(navigator.plugins[i].filename);
document.write("</td><td>");
document.write(navigator.plugins[i].description);
document.write("</td></tr>");
}
</script>
</table>
</body>
</html>
Checking for Plug-Ins:
Each plug-in has an entry in the array. Each entry has the following properties:
name - is the name of the plug-in.
filename - is the executable file that was loaded to install the plug-in.
description - is a description of the plug-in, supplied by the developer.
mimeTypes - is an array with one entry for each MIME type supported by the plug-in.
You can use these properties in a script to find out about the installed plug-ins, and then using JavaScript you can play appropriate multimedia file as follows:
<html>
<head>
<title>Using Plug-Ins</title>
</head>
<body>
<script language="JavaScript" type="text/javascript">
media =navigator.mimeTypes["video/quicktime"];
if (media){
document.write("<embedsrc='quick.mov' height=100 width=100>");
}
else{
document.write("<img src='quick.gif' height=100 width=100>");
}
</script>
</body>
</html>
NOTE: Here we are using HTML <embed> tag to embed a multimedia file.
Controlling Multimedia:
Let us take one real example which works in almost all the browsers:
<html>
<head>
<title>Using Embeded Object</title>
<script type="text/javascript">
<!--
function play()
{
if (!document.demo.IsPlaying()){
document.demo.Play();
}
}
function stop()
{
if (document.demo.IsPlaying()){
document.demo.StopPlay();
}
}
function rewind()
{
if (document.demo.IsPlaying()){
document.demo.StopPlay();
}
document.demo.Rewind();
}
//-->
</script>
</head>
<body>
<embed id="demo" name="demo"
src="http://www.amrood.com/games/kumite.swf"
width="318" height="300" play="false" loop="false"
pluginspage="http://www.macromedia.com/go/getflashplayer"
swliveconnect="true">
</embed>
<form name="form" id="form" action="#" method="get">
<input type="button" value="Start" onclick="play();" />
<input type="button" value="Stop" onclick="stop();" />
<input type="button" value="Rewind" onclick="rewind();" />
</form>
</body>
</html>
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