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JSP, JavaScript, AJAX to update value

James Daniel
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Joined: Sep 24, 2004
Posts: 80
I have a jsp that displays the value of a method in an object that is generated from values in a database. I need to update the page with new values as that object gets updated when the database is updated without refreshing the whole page. Any suggestions?
Bear Bibeault
Author and ninkuma
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Joined: Jan 10, 2002
Posts: 62139
    
  68

Well, you already mentioned Ajax in your title, so what's your question?


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James Daniel
Ranch Hand

Joined: Sep 24, 2004
Posts: 80
Are there any SPECIFIC suggestions on how to update a jsp with new values as that object gets updated when the database is updated without refreshing the whole page? What is the best approach? Does anyone have any code examples?
[ May 19, 2008: Message edited by: James Daniel ]
Bear Bibeault
Author and ninkuma
Marshal

Joined: Jan 10, 2002
Posts: 62139
    
  68

Specific answer usually follow specific questions.

There's no way for the client to know when the database is updated in order to initiate an Ajax call on its own. You're either going to need to rely upon user interaction during which a server check can be made, or poll the server checking for changes.

You could also look into Comet-like extended requests, but that's not generally recommended or particularly scalable.
 
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