I don\'t see an option in the plupload API docs on restricting the number of files uploaded, to any number, even 1.
Doc fail? or Feature fail? If it doesn\'t exist I\'ll
now you can disable multi-selection by setting multi_selection option to false
just like this
var uploader = new plupload.Uploader({
runtimes : 'html5,flash',
browse_button : 'button_id',
multi_selection:false, //disable multi-selection
...
official doc is here : http://www.plupload.com/documentation.php