This week's giveaway is in the JDBC forum.
We're giving away four copies of Java Database Connections & Transactions (e-book only) and have Marco Behler on-line!
See this thread for details.
Win a copy of Java Database Connections & Transactions (e-book only) this week in the JDBC forum!
  • Post Reply Bookmark Topic Watch Topic
  • New Topic
programming forums Java Mobile Certification Databases Caching Books Engineering Micro Controllers OS Languages Paradigms IDEs Build Tools Frameworks Application Servers Open Source This Site Careers Other all forums
this forum made possible by our volunteer staff, including ...
Marshals:
  • Campbell Ritchie
  • Devaka Cooray
  • Knute Snortum
  • Paul Clapham
  • Tim Cooke
Sheriffs:
  • Liutauras Vilda
  • Jeanne Boyarsky
  • Bear Bibeault
Saloon Keepers:
  • Tim Moores
  • Stephan van Hulst
  • Ron McLeod
  • Piet Souris
  • Frits Walraven
Bartenders:
  • Ganesh Patekar
  • Tim Holloway
  • salvin francis

Can you explain that?  RSS feed

 
Ranch Hand
Posts: 239
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Hi ranchers,
I am confused by such a statement in JSP.

Could you help me explain it?
 
Sheriff
Posts: 14691
16
Eclipse IDE Ubuntu VI Editor
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
param is a Map containing request parameters.
So param.start will look for a request parameter called "start", and take its value.
empty checks if a value is null or empty. Si if the "start" parameter does not exist, or if it's value is empty, it will return true.
${!empty param.start} will return true if "start" is not empty.
If this is true, the body tag of the "if" tag will be executed.
 
Zhixiong Pan
Ranch Hand
Posts: 239
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Very clear, thank you Satou.
 
It will give me the powers of the gods. Not bad for a tiny ad:
how do I do my own kindle-like thing - without amazon
https://coderanch.com/t/711421/engineering/kindle-amazon
  • Post Reply Bookmark Topic Watch Topic
  • New Topic
Boost this thread!