如何使用ruby和watir以正确的方式使用重试和救援异常？

Question

begin
  ie.select_list(:id, "PageSize").select_value("300")
rescue Watir::Exception::UnknownObjectException  
  aftererrorObj.errorMain(ie,con,country)
  retry
rescue Timeout::Error
  aftererrorObj.errorMain(ie,con,country)
  retry 
end

my ruby code is handling exception in this way.Is this right way to handle exception? will it work?

Answer 1

If you're just looking to rescue the script in case the object has not loaded yet due to AJAX or slow response time, something like this might be more appropriate:

Watir::Wait.until(60) { ie.select_list(:id, "PageSize").exists? }

OR

ie.select_list(:id, "PageSize").when_present.select_value("300)

Answer 2

If just want to catch multiple types of exceptions in the same rescue, combine them as comma separated list:

begin
  ie.select_list(:id, "PageSize").select_value("300")
rescue Watir::Exception::UnknownObjectException, Timeout::Error
  aftererrorObj.errorMain(ie,con,country)
  retry
end