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What is the difference between properties and attributes in HTML?
...own values (e.g., the valid types of an input). If you had <input type="foo">, then theInput.getAttribute("type") gives you "foo" but theInput.type gives you "text".
In contrast, the value property doesn't reflect the value attribute. Instead, it's the current value of the input. When the user...
What is mattr_accessor in a Rails module?
... end # directly access the class variable
end
MyModule.mattr_in_module = 'foo' # set it on the module
=> "foo"
MyClass.get_mattr # get it out of the class
=> "foo"
class SecondClass
include MyModule
def self.get_mattr; @@mattr_in_module; end # again directly access the class variable in...
What exactly is a Maven Snapshot and why do we need it?
...ocal repository, to make it available for the next builds.
For example, a foo-1.0.jar library is considered as a stable version, and if Maven finds it in the local repository, it will use this one for the current build.
Now, if you need a foo-1.0-SNAPSHOT.jar library, Maven will know that this ver...
Easy idiomatic way to define Ordering for a simple case class
...tring, load:Int)
object A {
val lexicographicalOrdering = Ordering.by { foo: A =>
foo.tag
}
val loadOrdering = Ordering.by { foo: A =>
foo.load
}
}
implicit val ord = A.lexicographicalOrdering
val l = List(A("words",1), A("article",2), A("lines",3)).sorted
// List(A(art...
Sass calculate percent minus px
...need to use calc() instead. Check browser compatibility on Can I use...
.foo {
height: calc(25% - 5px);
}
If your values are in variables, you may need to use interpolation turn them into strings (otherwise Sass just tries to perform arithmetic):
$a: 25%;
$b: 5px;
.foo {
width: calc(#{$a...
How to reset sequence in postgres and fill id column with new data?
...
ALTER SEQUENCE seq RESTART;
Then update the table's ID column:
UPDATE foo SET id = DEFAULT;
Source: PostgreSQL Docs
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jQuery equivalent of JavaScript's addEventListener method
...losest thing would be the bind function:
http://api.jquery.com/bind/
$('#foo').bind('click', function() {
alert('User clicked on "foo."');
});
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Is there a zip-like function that pads to longest length in Python?
...ue parameter:
>>> list(itertools.zip_longest(a, b, c, fillvalue='foo'))
[('a1', 'b1', 'c1'), ('foo', 'b2', 'c2'), ('foo', 'b3', 'foo')]
With Python 2 you can either use itertools.izip_longest (Python 2.6+), or you can use map with None. It is a little known feature of map (but map change...
Better to 'try' something and catch the exception or test if it's possible first to avoid an excepti
... a directory exists, do not do this:
import os, sys
if not os.path.isdir('foo'):
try:
os.mkdir('foo')
except OSError, e
print e
sys.exit(1)
If another thread or process creates the directory between isdir and mkdir, you'll exit. Instead, do this:
import os, sys, errno
try:
os....
How to retrieve a user environment variable in CMake (Windows)
...ke script
You can pass a variable on the line with the cmake invocation:
FOO=1 cmake
or by exporting a variable in BASH:
export FOO=1
Then you can pick it up in a cmake script using:
$ENV{FOO}
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