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How are the points in CSS specificity calculated
...at "Concatenating the three numbers a-b-c (in a number system with a large base) gives the specificity." So the geek in me just had to figure out just how large this base is.
It turns out that the "very large base" employed (at least by the 4 most commonly-used browsers*) to implement this standard...
How to modify a pull request on GitHub to change target branch to merge into?
...
Update August 2016: Change the base branch of a Pull Request finally allows for changing that branch.
(And this closes issue 18, which was 3 years old and had 1500+ comments)
After you’ve created a pull request, you can modify the base branch so that...
How to use permission_required decorators on django class-based views
...n in all the views, and in some of them, specific permissions. In function-based views I do that with @permission_required() and the login_required attribute in the view, but I don't know how to do this on the new views. Is there some section in the django docs explaining this? I didn't found anythi...
Visual Studio: How do I show all classes inherited from a base class?
In Visual Studio, How do I show all classes inherited from a base class?
19 Answers
...
How do I create an abstract base class in JavaScript?
Is it possible to simulate abstract base class in JavaScript? What is the most elegant way to do it?
16 Answers
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How do I initialize the base (super) class?
...asses are derived from object and are what you are using, and invoke their base class through super(), e.g.
class X(object):
def __init__(self, x):
pass
def doit(self, bar):
pass
class Y(X):
def __init__(self):
super(Y, self).__init__(123)
def doit(self, foo):
return supe...
JavaScript Chart Library
...s of JavaScript solutions for graphics that do not require Flash:
Canvas-based, rendered in IE using ExplorerCanvas that in turns relies on VML
SVG on standard-based browsers, rendered as VML in IE
There are pros and cons of both approaches but for a charting library I would recommend the later ...
How to inherit constructors?
Imagine a base class with many constructors and a virtual method
14 Answers
14
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Is it unnecessary to put super() in constructor?
...) is a compiler error so it must be specified.
For example:
public class Base { }
public class Derived extends Base { }
This is fine because if you add no constructor explicitly Java puts in a public default constructor for you.
public class Base { }
public class Derived extends Base { public D...
Check if a table exists in Rails
...tables/views, collectively data sources.
# Tables and views
ActiveRecord::Base.connection.data_sources
ActiveRecord::Base.connection.data_source_exists? 'kittens'
# Tables
ActiveRecord::Base.connection.tables
ActiveRecord::Base.connection.table_exists? 'kittens'
# Views
ActiveRecord::Base.connect...