initConstants () {
    super.initConstants()

    this.constants.classes.buttonsGroup = 'ui buttons'
    this.constants.classes.buttonsDropdown = 'ui button dropdown'
    this.constants.classes.inputGroup = 'ui input'
    this.constants.classes.paginationDropdown = 'ui dropdown'

    this.constants.html.toolbarDropdown = ['<div class="menu">', '</div>']
    this.constants.html.toolbarDropdownItem = '<label class="item dropdown-item-marker">%s</label>'
    this.constants.html.toolbarDropdownSeparator = '<div class="divider"></div>'
    this.constants.html.pageDropdown = ['<div class="menu">', '</div>']
    this.constants.html.pageDropdownItem = '<a class="item %s" href="#">%s</a>'
    this.constants.html.dropdownCaret = '<i class="dropdown icon"></i>'
    this.constants.html.pagination = ['<div class="ui pagination menu%s">', '</div>']
    this.constants.html.paginationItem = '<a class="page-item item%s" aria-label="%s" href="#">%s</a>'
    this.constants.html.inputGroup = '<div class="ui action input">%s%s</div>'
  }
@author zhixin wen <wenzhixin2010@gmail.com>
https://github.com/wenzhixin/bootstrap-table/
theme: https://github.com/Semantic-Org/Semantic-UI