You can apply jQuery.filer plugin to the input file and to send options als Object or Function. Example:

$("#file_input").filer( Obj );

$("#file_input").filer(function(default_options){
    return Obj;
});

• Name
  Description
• limit

  Maximal number of files.

  null, Number; Default value: null
• maxSize

  Maximal size in MB's for all files.

  null, Number; Default value: null
• fileMaxSize

  Maximal file size in MB's for each file.

  null, Number; Default value: null
• extensions

  File extensions and mime types whitelist.

  null, Array; Default value: null
• changeInput

  Create a new file input element. You can use the default template or to write your own as String or jQuery Element.

  Boolean, String, Object; Default value: true
• showThumbs

  Show the in-browser files previews.

  Boolean; Default value: false
• appendTo

  The target thumbnails target element selector. Use this option when you want to append your files previews into specific element.

  null, String; Default value: null
• theme

  Specify the jQuery.filer theme. It will just set to main filer div as class the theme name.

  null, String; Default value: null
• templates

  Specify the file preview templates, selectors and some options.

  Object, Default value:
  
  

  {
      box: null, //Thumbnail's box element {null, String}
      item: null, //File item element {String(use Filer Variables), Function}
      itemAppend: null, //File item element for edit mode {String(use Filer Variables), Function}
      progressBar: null, //File upload progress bar element {String}
      itemAppendToEnd: false, //Append the new file item to the end of the list {Boolean}
      removeConfirmation: true, //Remove file confirmation {Boolean}
      canvasImage: true //Resize and crop the image thumbnail to item element size
      _selectors: {
          list: null, //List selector {String}
          item: null, //Item selector {String}
          progressBar: null, //Progress bar selector {String}
          remove: null //Remove button selector {String}
      }
  }

• uploadFile

  Enable Instantly file uploading feature. In the object you can specify the normal jQuery $.ajax options, or callbacks.

  null, Object; Default value:
  
  

  {
      url: null, //URL to which the request is sent {String}
      data: null, //Data to be sent to the server {Object}
      type: 'POST', //The type of request {String}
      enctype: 'multipart/form-data', //Request enctype {String}
      synchron: false //Upload synchron the files
      beforeSend: null, //A pre-request callback function {Function}
      success: null, //A function to be called if the request succeeds {Function}
      error: null, //A function to be called if the request fails {Function}
      statusCode: null, //An object of numeric HTTP codes {Object}
      onProgress: null, //A function called while uploading file with progress percentage {Function}
      onComplete: null //A function called when all files were uploaded {Function}
  }

• dragDrop

  Enable Drag&Drop feature. In this object you can specify only the callbacks. Note that this feature works only with activated uploadFile option.

  null, Object; Default value: null
  
  

  {
      dragEnter: null, //A function that is fired when a dragged element enters the input. {Function}
      dragLeave: null, //A function that is fired when a dragged element leaves the input. {Function}
      drop: null, //A function that is fired when a dragged element is dropped on a valid drop target. {Function}
      dragContainer: null //Drag container {String}
  }

• addMore

  Multiple file selection without instantly uploading them. You need to enable this feature in Edit Mode when you need to upload more than 1 file.
  Note that if you want to use it, you will need to remove the options dragDrop and uploadFile.

  Boolean; Default value: false
• allowDuplicates

  Allow or disallow user to upload the same file multiple time.

  Boolean; Default value: false
• clipBoardPaste

  Printscreen or copied images would be uploaded by pasting. Note that this feature works only by instantly uploading. In Firefox this feature is not available.

  Boolean; Default value: false
• excludeName

  By removing a file the script is creating an hidden input with it's name. Use this option if you want to specify the input's name.

  null; Default value: jfiler-items-exclude-(input file name)-(input index)
• files

  The list with the already uploaded files. Use this option in Edit Mode. Note that on the back-end side to get the full list with files you will need to append new uploaded list to the old one (security reasons).

  null, Array; Default value:
  
  

  [
      {
          name: "appended_file.jpg",
          size: 5453,
          type: "image/jpg",
          file: "/path/to/file.jpg",
          url: "http://path/to/link/file2.jpg"
      },
      {
          name: "appended_file_2.jpg",
          size: 9453,
          type: "image/jpg",
          file: "path/to/file2.jpg",
          url: "http://path/to/link/file2.jpg"
      }
  ]

• beforeRender

  A function that is fired before rendering the new file input.

  null, Function; Default value: null
• afterRender

  A function that is fired after rendering the new file input.

  null, Function; Default value: null
• beforeShow

  A function that is fired before showing thumbnail's box. Should return Boolean value.

  null, Function; Default value: null
• afterShow

  A function that is fired after appending all thumbnails items.

  null, Function; Default value: null
• beforeSelect

  A function that is fired after selecting a file and before adding it to the memory. Should return Boolean value.

  null, Function; Default value: null
• onSelect

  A function that is fired after selecting a file.

  null, Function; Default value: null
• onFileCheck

  A function that is fired by checking the file. Should return a Boolean value.

  null, Function; Default value: null
• onRemove

  A function that is fired on/before deleting a file. Should return Boolean value.

  null, Function; Default value: null
• onEmpty

  A function that is fired when no files are selected.

  null, Function; Default value: null
• options

  Specify your own options that you can also use as Filer Variables.

  Object
  
  
• dialogs

  The dialogs object for alert and confirmation. You can use your own modals to do this.

  null, Obj; Default value:
  
  

  {
      alert: function(text) {
          return alert(text);
      },
      confirm: function(text, callback) {
          confirm(text) ? callback() : null;
      }
  }

• captions

  Specify your own captions. Here you can also use Filer Variables.

  Object; Default value:
  
  

  {
      button: "Choose Files",
      feedback: "Choose files To Upload",
      feedback2: "files were chosen",
      drop: "Drop file here to Upload",
      removeConfirmation: "Are you sure you want to remove this file?",
      errors: {
          filesLimit: "Only {{fi-limit}} files are allowed to be uploaded.",
          filesType: "Only Images are allowed to be uploaded.",
          filesSize: "{{fi-name}} is too large! Please upload file up to {{fi-fileMaxSize}} MB.",
          filesSizeAll: "Files you've choosed are too large! Please upload files up to {{fi-maxSize}} MB.",
          folderUpload: "You are not allowed to upload folders."
      }
  }