## extension.rb

module UpdatedHelper
  def link_to label, path, options = {}
    if options.has_key?(:disable_with]
      options[:html] ||= { }
      options[:html].merge! "data-disable" => options[:disable_with]
    end

    super label, path, options
  end
end

## jquery [javascript]

jQuery(document).ready(function() {
  jQuery(":submit[data-disable=*]").click(function(event) {
    event.preventDefault();

    this.setAttribute('originalValue', this.value);
    this.disabled = true;
    this.value='Please wait...';
    var result = (this.form.onsubmit ? (this.form.onsubmit() ? this.form.submit() : false) : this.form.submit());

    if (result == false) {
      this.value = this.getAttribute('originalValue');
      this.disabled = false;
    }

    return result;
  });
});