fileinput.js

/* ===========================================================
 * Bootstrap: fileinput.js v3.1.3
 * http://jasny.github.com/bootstrap/javascript/#fileinput
 * ===========================================================
 * Copyright 2012-2014 Arnold Daniels
 *
 * Licensed under the Apache License, Version 2.0 (the "License")
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * ========================================================== */

+function ($) { "use strict";

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

  // FILEUPLOAD PUBLIC CLASS DEFINITION
  // =================================

  var Fileinput = function (element, options) {
    this.$element = $(element)

    this.options = $.extend({}, Fileinput.DEFAULTS, options)
    this.$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()
    this.reset()
  }

  Fileinput.DEFAULTS = {
    clearName: true
  }

  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.verifySizes = function(files) {
    if (typeof this.options.maxSize === 'undefined') return true

    var max = parseFloat(this.options.maxSize)
    if (max !== this.options.maxSize) return true

    for (var i = 0; i < files.length; i++) {
      var size = typeof files[i].size !== 'undefined' ? files[i].size : null
      if (size === null) continue

      size = size / 1000 / 1000 /* convert from bytes to MB */
      if (size > max) return false
    }

    return true
  }

  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()
      this.$element.trigger('clear.bs.fileinput')
      return
    }

    if (!this.verifySizes(files)) {
      this.$element.trigger('max_size.bs.fileinput')

      this.clear()
      this.$element.trigger('clear.bs.fileinput')
      return
    }

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

    var file = files[0]

    if (this.$preview.length > 0 && (typeof file.type !== "undefined" ? file.type.match(/^image\/(gif|png|jpeg|svg\+xml)$/) : file.name.match(/\.(gif|png|jpe?g|svg)$/i)) && typeof FileReader !== "undefined") {
      var Fileinput = this
      var reader = new FileReader()
      var preview = this.$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') {
          var mh = parseInt(preview.css('max-height'), 10) || 0
          var pt = parseInt(preview.css('padding-top'), 10) || 0
          var pb = parseInt(preview.css('padding-bottom'), 10) || 0
          var bt = parseInt(preview.css('border-top'), 10) || 0
          var bb = parseInt(preview.css('border-bottom'), 10) || 0

          $img.css('max-height', mh - pt - pb - bt - bb)
        }

        preview.html($img)
        if (Fileinput.options.exif) {
          //Fix image tranformation if this is possible
          Fileinput.setImageTransform($img, file);
        }
        element.addClass('fileinput-exists').removeClass('fileinput-new')

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

      reader.readAsDataURL(file)
    } else {
      var text = file.name
      var $nameView = this.$element.find('.fileinput-filename')

      if (files.length > 1) {
        text = $.map(files, function(file) {
          return file.name;
        }).join(', ')
      }

      $nameView.text(text)
      this.$preview.text(file.name)
      this.$element.addClass('fileinput-exists').removeClass('fileinput-new')
      this.$element.trigger('change.bs.fileinput')
    }
  },

  Fileinput.prototype.setImageTransform = function($img, file) {
      var Fileinput = this;
      var reader = new FileReader();
      reader.onload = function(me) {
        var transform = false;
        var view = new DataView(reader.result);
        var exif = Fileinput.getImageExif(view);
        if (exif) {
            Fileinput.resetOrientation($img, exif);
        }
      }

      reader.readAsArrayBuffer(file);
  }

  Fileinput.prototype.getImageExif = function(view) {
    if (view.getUint16(0, false) != 0xFFD8) { 
      return -2;
    }    
    var length = view.byteLength, offset = 2;
    while (offset < length) {
      var marker = view.getUint16(offset, false);
          offset += 2;
      if (marker == 0xFFE1) {
        if (view.getUint32(offset += 2, false) != 0x45786966) { 
          return -1;
        }
        var little = view.getUint16(offset += 6, false) == 0x4949;
            offset += view.getUint32(offset + 4, little);
        var tags = view.getUint16(offset, little);
            offset += 2;
        for (var i = 0; i < tags; i++)   {
          if (view.getUint16(offset + (i * 12), little) == 0x0112) {
            return view.getUint16(offset + (i * 12) + 8, little); 
          }
        }
      }
      else if ((marker & 0xFF00) != 0xFF00){
         break;
      } else {
        offset += view.getUint16(offset, false);
      } 
    }

    return -1;
  }

  Fileinput.prototype.resetOrientation = function($img, transform) {
  var img = new Image();    
  
  img.onload = function() {
    var width = img.width,
        height = img.height,
        canvas = document.createElement('canvas'),
        ctx = canvas.getContext("2d");

    // set proper canvas dimensions before transform & export
    if ([5,6,7,8].indexOf(transform) > -1) {
      canvas.width = height;
      canvas.height = width;
    } else {
      canvas.width = width;
      canvas.height = height;
    }
    
    // transform context before drawing image
    switch (transform) {
      case 2: ctx.transform(-1, 0, 0, 1, width, 0); break;
      case 3: ctx.transform(-1, 0, 0, -1, width, height ); break;
      case 4: ctx.transform(1, 0, 0, -1, 0, height ); break;
      case 5: ctx.transform(0, 1, 1, 0, 0, 0); break;
      case 6: ctx.transform(0, 1, -1, 0, height , 0); break;
      case 7: ctx.transform(0, -1, -1, 0, height , width); break;
      case 8: ctx.transform(0, -1, 1, 0, 0, width); break;
      default: ctx.transform(1, 0, 0, 1, 0, 0);
    }

    // draw image
    ctx.drawImage(img, 0, 0);

    // export base64
    $img.attr('src', canvas.toDataURL());
  };

  img.src = $img.attr('src');
};

  Fileinput.prototype.clear = function(e) {
    if (e) e.preventDefault()

    this.$hidden.val('')
    this.$hidden.attr('name', this.name)
    if (this.options.clearName) 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('reseted.bs.fileinput')
  },

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


  // FILEUPLOAD PLUGIN DEFINITION
  // ===========================

  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


  // FILEINPUT NO CONFLICT
  // ====================

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


  // FILEUPLOAD DATA-API
  // ==================

  $(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);