cot/WebRoot/admin/js/bootstrap-fileinput.js

+function ($) { "use strict";

  var isIE = window.navigator.appName == 'Microsoft Internet Explorer';

  var Fileinput = function (element, options) {
    this.$element = $(element);
    
    this.$input = this.$element.find(':file');
    if (this.$input.length === 0) return;

    this.name = this.$input.attr('name') || options.name;

    this.$hidden = this.$element.find('input[type=hidden][name="' + this.name + '"]');
    if (this.$hidden.length === 0) {
      this.$hidden = $('<input type="hidden">').insertBefore(this.$input)
    }

    this.$preview = this.$element.find('.fileinput-preview');
    var height = this.$preview.css('height');
    if (this.$preview.css('display') !== 'inline' && height !== '0px' && height !== 'none') {
      this.$preview.css('line-height', height)
    }
        
    this.original = {
      exists: this.$element.hasClass('fileinput-exists'),
      preview: this.$preview.html(),
      hiddenVal: this.$hidden.val()
    };
    
    this.listen()
  };
  
  Fileinput.prototype.listen = function() {
    this.$input.on('change.bs.fileinput', $.proxy(this.change, this));
    $(this.$input[0].form).on('reset.bs.fileinput', $.proxy(this.reset, this));
    
    this.$element.find('[data-trigger="fileinput"]').on('click.bs.fileinput', $.proxy(this.trigger, this));
    this.$element.find('[data-dismiss="fileinput"]').on('click.bs.fileinput', $.proxy(this.clear, this))
  };

  Fileinput.prototype.change = function(e) {
    var files = e.target.files === undefined ? (e.target && e.target.value ? [{ name: e.target.value.replace(/^.+\\/, '')}] : []) : e.target.files;
    
    e.stopPropagation();

    if (files.length === 0) {
      this.clear();
      return
    }

    this.$hidden.val('');
    this.$hidden.attr('name', '');
    this.$input.attr('name', this.name);

    var file = files[0];

    if (this.$preview.length > 0 && (typeof file.type !== "undefined" ? file.type.match(/^image\/(gif|png|jpeg)$/) : file.name.match(/\.(gif|png|jpe?g)$/i)) && typeof FileReader !== "undefined") {
      var reader = new FileReader();
      var preview = this.$preview;
      var element = this.$element;

      reader.onload = function(re) {
        var $img = $('<img>');
        $img[0].src = re.target.result;
        files[0].result = re.target.result;
        
        element.find('.fileinput-filename').text(file.name);
        
        // if parent has max-height, using `(max-)height: 100%` on child doesn't take padding and border into account
        if (preview.css('max-height') != 'none') $img.css('max-height', parseInt(preview.css('max-height'), 10) - parseInt(preview.css('padding-top'), 10) - parseInt(preview.css('padding-bottom'), 10)  - parseInt(preview.css('border-top'), 10) - parseInt(preview.css('border-bottom'), 10));
        
        preview.html($img);
        element.addClass('fileinput-exists').removeClass('fileinput-new');

        element.trigger('change.bs.fileinput', files)
      };

      reader.readAsDataURL(file)
    } else {
      this.$element.find('.fileinput-filename').text(file.name);
      this.$preview.text(file.name);

      this.$element.addClass('fileinput-exists').removeClass('fileinput-new');
      
      this.$element.trigger('change.bs.fileinput')
    }
  };

  Fileinput.prototype.clear = function(e) {
    if (e) e.preventDefault();
    
    this.$hidden.val('');
    this.$hidden.attr('name', this.name);
    this.$input.attr('name', '');

    //ie8+ doesn't support changing the value of input with type=file so clone instead
    if (isIE) { 
      var inputClone = this.$input.clone(true);
      this.$input.after(inputClone);
      this.$input.remove();
      this.$input = inputClone;
    } else {
      this.$input.val('')
    }

    this.$preview.html('');
    this.$element.find('.fileinput-filename').text('');
    this.$element.addClass('fileinput-new').removeClass('fileinput-exists');
    
    if (e !== undefined) {
      this.$input.trigger('change');
      this.$element.trigger('clear.bs.fileinput')
    }
  };

  Fileinput.prototype.reset = function() {
    this.clear();

    this.$hidden.val(this.original.hiddenVal);
    this.$preview.html(this.original.preview);
    this.$element.find('.fileinput-filename').text('');

    if (this.original.exists) this.$element.addClass('fileinput-exists').removeClass('fileinput-new');
     else this.$element.addClass('fileinput-new').removeClass('fileinput-exists');
    
    this.$element.trigger('reset.bs.fileinput')
  };

  Fileinput.prototype.trigger = function(e) {
    this.$input.trigger('click');
    e.preventDefault()
  };

  var old = $.fn.fileinput;
  
  $.fn.fileinput = function (options) {
    return this.each(function () {
      var $this = $(this),
          data = $this.data('bs.fileinput');
      if (!data) $this.data('bs.fileinput', (data = new Fileinput(this, options)));
      if (typeof options == 'string') data[options]()
    })
  };

  $.fn.fileinput.Constructor = Fileinput;

  $.fn.fileinput.noConflict = function () {
    $.fn.fileinput = old;
    return this
  };

  $(document).on('click.fileinput.data-api', '[data-provides="fileinput"]', function (e) {
    var $this = $(this);
    if ($this.data('bs.fileinput')) return;
    $this.fileinput($this.data());
      
    var $target = $(e.target).closest('[data-dismiss="fileinput"],[data-trigger="fileinput"]');
    if ($target.length > 0) {
      e.preventDefault();
      $target.trigger('click.bs.fileinput');
    }
  });

}(window.jQuery);