Question

I am validating a field called client code for uniqueness…

I have used onkeyup JS event for this purpose.
But its not working fine when i type the keys very fast. On this

onkeyup event

i am sending an ajax request to check whether the entered data already exists in the table or not.

Pls help if there is any alternative..

Answer 1

Your question is quite vague in terms of the actual issue that you seem to be facing. But what I derive from it is that you are firing too many requests as you suggest rapid key presses!

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As you would know, Ajax is like a normal page request, just done async, so it is bound by the same network latency, throughput and round trip constraints.

A clean way to achieve the functionality you need is to use a technique called throttling. One of the best js plugin for this purpose is located here: http://benalman.com/projects/jquery-throttle-debounce-plugin/
It basically allows you to rate-limit your requests to the server, thus not choking the resources and providing a smooth UI.

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Also, unless you wish to trap certain special keys like ESC, I would suggest using keypress or keydown events. Can’t remember the specific reasoning for it, but just a suggestion.