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How to design a multi-user ajax web application to be concurrently safe
...hose). A single key-value pair might be OK too though less extendable. see http://en.wikipedia.org/wiki/Circular_buffer
A server or pseudo-server component that is able to deliver relevant changelogs to a connected user efficiently. Observer-Pattern is your friend for this.
2. Client-Side:
A ja...
How to stop an app on Heroku?
... can scale the web dynos down to zero which effectively takes all your app http-processes offline.
$ heroku ps:scale web=0
Scaling web processes... done, now running 0
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Database Design for Tagging
...
Here's a good article on tagging Database schemas:
http://howto.philippkeller.com/2005/04/24/Tags-Database-schemas/
along with performance tests:
http://howto.philippkeller.com/2005/06/19/Tagsystems-performance-tests/
Note that the conclusions there are very specific to My...
Are the PUT, DELETE, HEAD, etc methods available in most web browsers?
...and states:
The keyword get, mapping to the state GET, indicating the HTTP GET
method. The GET method should only request and retrieve data and
should have no other effect.
The keyword post, mapping to the state
POST, indicating the HTTP POST method. The POST method requests that
...
How to upgrade Eclipse for Java EE Developers?
... > Available Software Sites > Add...
Name: Oxygen
Location: http://download.eclipse.org/releases/oxygen/
Then tell Eclipse to look for updates: Help > Check for updates.
After the installation, Eclipse will restart and show the old splash screen. Next time you manually stop/s...
Detect If Browser Tab Has Focus
...
Yes, window.onfocus and window.onblur should work for your scenario:
http://www.thefutureoftheweb.com/blog/detect-browser-window-focus
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fol...
Devise - How do I forbid certain users from signing in?
... popular topic and there's a whole list of gems that can help you with it:
http://ruby-toolbox.com/categories/rails_authorization.html
Take your pick.
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What is a provisioning profile used for when developing iPhone applications?
...ent devices.
Here's how to create one, and the reference for this answer:
http://www.wikihow.com/Create-a-Provisioning-Profile-for-iPhone
Another link:
http://iphone.timefold.com/provisioning.html
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JavaScript: Get image dimensions
...
This uses the function and waits for it to complete.
http://jsfiddle.net/SN2t6/118/
function getMeta(url){
var r = $.Deferred();
$('<img/>').attr('src', url).load(function(){
var s = {w:this.width, h:this.height};
r.resolve(s)
});
return r;
}
getMet...
A Better Django Admin ManyToMany Field Widget
...
you could try using a raw id in the admin.
and the django docs:
http://docs.djangoproject.com/en/dev/ref/contrib/admin/#django.contrib.admin.ModelAdmin.raw_id_fields
if you are looking for something with auto-complete you might want to look at this as a starting point http://code.djangop...