attachment.js

$(document).ready(function() {
  //upload image in description
    $('#email_description').summernote({
    height: 300,
    onImageUpload: function(files, editor, welEditable) {
               for (var i = files.length - 1; i >= 0; i--) {
               sendFile(files[i], this);
            }
      }
  });
  //create record for attachment
  function sendFile(file, el) {
    data = new FormData();
    data.append("file", file);
    $.ajax({
        type: "POST",
        url: "/compose_mails/attachment_upload",
        data: data,
        cache: false,
        contentType: false,
        processData: false,
        dataType: 'json',
        success: function(response) {
          $(el).summernote('editor.insertImage', response.url.attachment_url.url, response.id);                 
        },
        error : function(error) {
          alert('error');
        },
        complete : function(response) {
        }
    });
  }
}