According to PLUPLOAD, it allows you to upload files using HTML5 Gears, Silverlight, Flash, BrowserPlus or normal forms, providing some unique features such as upload progress, image resizing and chunked uploads. I am going to use PLUPLOAD to upload multi-files to server.

The example it provides is:

<form method="post" action="javascript:void();" id="form_uploader">

You browser doesn't have Flash, Silverlight, Gears, BrowserPlus
      or HTML5 support.

</form>

It is excellent, the uploading effects are very cool. However, I wan to add more extra fields within the default sample, to upload them together. The codes become:

<form method="post" action="javascript:void();" id="form_uploader">
 
  Title:
  
 
 
  Comment:
  
  
 
 
  You browser doesn't have Flash, Silverlight, Gears, BrowserPlus
      or HTML5 support.
 
</form>

The added fields ’title’ and ’comment’ don’t be identified after post. The server-side php scripts can’t find the 2 new fields(in $_POST). I googled and found there is very few tips and soultion, and had to process by myself. By analysing the Plupload source codes, finally I made it work. The steps: (all the following JS codes is added directly below the file-upload form.)

//(1) in $("#uploader").pluploadQueue({}), add following to initialize:
multipart_params: { 'title': '','comment': '' },

//(2) add the following right after $("#uploader").pluploadQueue({}).
var uploader = $('#uploader').pluploadQueue();
uploader.bind('FilesAdded', function(up, files) {
 uploader.settings.multipart_params.title = $("#title").val();
 uploader.settings.multipart_params.comment = $("#comment").val();
});

When submit button clicks, the form executes the events binding within it. The ‘FilesAdded’ event is a internal event which assigns form’s dynamic variables. In this period, the new added dynamic varaibles ‘title’ and ‘comment’ are actived.

The posted parameters past to php script are correct. So I can put the ‘title’, ‘comment’ together with uploaded multi-files to server-side store medium - database and directory. They work fine.