# Prototype / scriptaculous - 2 Questions, may a suggest for a

**URL:** <https://www.ruby-forum.com/t/prototype-scriptaculous-2-questions-may-a-suggest-for-a/109191>\
**Category:** Rails\
**Created:** [July 12, 2007, 10:07am UTC](https://www.ruby-forum.com/t/prototype-scriptaculous-2-questions-may-a-suggest-for-a/109191 "2007-07-12T10:07:35Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![rafael](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/4da419/32.png) [@rafael](https://www.ruby-forum.com/u/rafael)\
**Post date:** [July 12, 2007, 10:07am UTC](https://www.ruby-forum.com/t/prototype-scriptaculous-2-questions-may-a-suggest-for-a/109191/1 "2007-07-12T10:07:35Z")

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Hi folx,

as I was looking for solutions for some AJAX challenges, I thought,  
that other people are interested as well in this approach.  
May Ryan or Geoffrey are interested to make a little recipe /  
screencast out of that.

So I try to find clue’s for following challenges:

- AJAX progress - loading - image should be visible until the last  
selection has been made.  
Lets say, you have an observe\_form / observe\_field, and you have  
multiple filters with some checkboxes and a progress bar. When you  
make several selections, normally the ajax loader is invoked for each  
event on the observer.  
But this looks ugly, at least mine does.

So, here’s the question… Does anybody know, if it should be done  
with something like a queue for ajax calls or do you have another  
approach?  
Is there a best way to do that?

- showing / hiding many records in the list with a transition gets  
veery slow  
while trying to make a smooth animation to fade out, blindup filtered  
records, I get a browser performance issue.

Try to bilndup more then a hundered items and the browser gets a  
performance problem.  
Is there another approach?  
I tried it with and without DB Select, DB select was not the  
bottleneck.

Thank you for helping in advance

kind regards

Rafael