/**
* --------------------------------------------------------------------
* jQuery customfileinput plugin
* Author: Scott Jehl, scott@filamentgroup.com
* Copyright (c) 2009 Filament Group
* licensed under MIT (filamentgroup.com/examples/mit-license.txt)
* --------------------------------------------------------------------
*/
$.fn.customFileInput = function(){
//apply events and styles for file input element
var fileInput = $(this)
.addClass('customfile-input') //add class for CSS
.mouseover(function(){ upload.addClass('customfile-hover'); })
.mouseout(function(){ upload.removeClass('customfile-hover'); })
.focus(function(){
upload.addClass('customfile-focus');
fileInput.data('val', fileInput.val());
})
.blur(function(){
upload.removeClass('customfile-focus');
$(this).trigger('checkChange');
})
.bind('disable',function(){
fileInput.attr('disabled',true);
upload.addClass('customfile-disabled');
})
.bind('enable',function(){
fileInput.removeAttr('disabled');
upload.removeClass('customfile-disabled');
})
.bind('checkChange', function(){
if(fileInput.val() && fileInput.val() != fileInput.data('val')){
fileInput.trigger('change');
}
})
.bind('change',function(){
//get file name
var fileName = $(this).val().split(/\\/).pop();
//get file extension
var fileExt = 'customfile-ext-' + fileName.split('.').pop().toLowerCase();
//update the feedback
uploadFeedback
.text(fileName) //set feedback text to filename
.removeClass(uploadFeedback.data('fileExt') || '') //remove any existing file extension class
.addClass(fileExt) //add file extension class
.data('fileExt', fileExt) //store file extension for class removal on next change
.addClass('customfile-feedback-populated'); //add class to show populated state
//change text of button
uploadButton.text('Change');
})
.click(function(){ //for IE and Opera, make sure change fires after choosing a file, using an async callback
fileInput.data('val', fileInput.val());
setTimeout(function(){
fileInput.trigger('checkChange');
},100);
});

//create custom control container
var upload = $('<div class="customfile"></div>');
//create custom control button
var uploadButton = $('<span class="customfile-button" aria-hidden="true">Browse</span>').appendTo(upload);
//create custom control feedback
var uploadFeedback = $('<span class="customfile-feedback" aria-hidden="true">No file selected...</span>').appendTo(upload);

//match disabled state
if(fileInput.is('[disabled]')){
fileInput.trigger('disable');
}


//on mousemove, keep file input under the cursor to steal click
upload
.mousemove(function(e){
fileInput.css({
'left': e.pageX - upload.offset().left - fileInput.outerWidth() + 20, //position right side 20px right of cursor X)
'top': e.pageY - upload.offset().top - $(window).scrollTop() - 3
});
})
.insertAfter(fileInput); //insert after the input

fileInput.appendTo(upload);

//return jQuery
return $(this);
};
