Comments on: Caching AJAX Results in JavaScript

By: Chad

Chad — Thu, 01 Sep 2011 22:39:36 +0000

Hey Guys

I get cachehandle is not defined object !! any ideas???

By: Andy from Workshopshed

Andy from Workshopshed — Fri, 03 Jun 2011 06:55:53 +0000

David, what happens if the page is refreshed in this case, is the cache cleared or will it be preserved?

By: gel

gel — Tue, 05 Jan 2010 07:38:53 +0000

btw, the wp pdf plugin don’t works :D

By: Иван

Иван — Fri, 04 Sep 2009 11:53:02 +0000

Supposedly a user stays on a page more than 10 minutes. Then there is a chance that the user will stay more.

Why destroy the cache then? Why not instead, use HEAD HTTP method and see if the state of the cache is still valid? If it is still valid — keep it. No need to re-fetch the same data over and over again.

Even better, you could set up a cron that fetches the remote data every once in a while, again using HEAD to determine whether or not indeed the cache has expired and then load the data from your local file (preferably json, since it’s kinda fast). Set the reasonable expires headers accordingly to the last modified time of the local item and the update expectancy of the remote source.

Of course, this is far from “real time” data, but then again it saves bandwidth, cuts down server load, eliminates network related issues and thus improves user experience.

On the other hand, if indeed real-time-like feel is required, we are talking about caching and requesting on a whole new level.

By: Connie

Connie — Thu, 03 Sep 2009 10:12:04 +0000

Hi,

do I understand that correctly,
that for instance I could cache values from a mysql query which runs to fill the autosuggest-dropdown to use these values to populate other fields of the form after the autosuggested value is accepted by the user?

By: David Walsh

David Walsh — Wed, 02 Sep 2009 16:03:31 +0000

@Keith: Hahaha. My bad — wrong person.

By: Jeremy Martin

Jeremy Martin — Wed, 02 Sep 2009 02:23:06 +0000

An interesting challenge, from an academic perspective at least, would be to implement a more persistent form of caching using cookies – don’t need to modify headers, but you still get content caching across browser sessions. Probably not practical for many real life uses, but would be interesting none-the-less…

By: Keith

Keith — Tue, 01 Sep 2009 22:51:28 +0000

That’s what I said, right? :)

By: David Walsh

David Walsh — Tue, 01 Sep 2009 22:45:55 +0000

@Keith: {} is an empty object declaration in javascript.

By: Keith

Keith — Tue, 01 Sep 2009 22:37:43 +0000

@Ben: it is shorthand for creating an object.

var foo = []; is a shorthand method of creating an array;