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Friday, February 24, 2017

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.

Example

Here is an example that shows how to list down all the plug-on installed in 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>

Output

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 the installed plug-ins, and then using JavaScript, you can play appropriate multimedia file. Take a look at the following example.
<html>
   
   <head>
      <title>Using Plug-Ins</title>
   </head>
   
   <body>
   
      <script language="JavaScript" type="text/javascript">
         media = navigator.mimeTypes["video/quicktime"];
         
         if (media){
            document.write("<embed src='quick.mov' height=100 width=100>");
         }
         else
         {
            document.write("<img src='quick.gif' height=100 width=100>");
         }
      </script>
      
   </body>
</html>

Output

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>

Output

If you are using Mozilla, Firefox or Netscape, then
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