Often times, responsive web design involves media queries, which are CSS blocks that are only executed if a condition is satisfied. This is useful for responsive web design because you can use media queries to specify different CSS styles for the mobile version of your website versus the desktop ver...
It is possible to upload multiple parts, each with a different name. For each part name, you will need one parameter annotated with @RequestPart, whose name matches the part name.
To receive a file uploaded via an HTTP Post, you need to do the following:
@RequestMapping(
value = "...&quo...
With Clipping and Masking you can make some specified parts of elements transparent or opaque. Both can be applied to any HTML element.
Clipping
Clips are vector paths. Outside of this path the element will be transparent, inside it's opaque. Therefore you can define a clip-path property on elemen...
Double quoteSingle quoteAllows variable expansionPrevents variable expansionAllows history expansion if enabledPrevents history expansionAllows command substitutionPrevents command substitution* and @ can have special meaning* and @ are always literalsCan contain both single quote or double quoteSin...
Sometimes you may only need to simulate an event with two outcomes, maybe with different probabilities, but you may find yourself in a situation that calls for many possible outcomes with different probabilities. Let's imagine you want to simulate an event that has six equally probable outcomes. T...
An existing working copy can be quickly transformed to reflect the contents of a different branch in the same repository. For example, you might have a working copy of the trunk and now need to work on a development branch. Instead of checking out a completely new working copy (which can waste a l...
The symbol NA is for a logical missing value:
class(NA)
#[1] "logical"
This is convenient, since it can easily be coerced to other atomic vector types, and is therefore usually the only NA you will need:
x <- c(1, NA, 1)
class(x[2])
#[1] "numeric"
If you do need a s...
The normal obj.save() method will use the default database, or if a database router is used, it will use the database as specified in db_for_write. You can override it by using:
obj.save(using='other_db')
obj.delete(using='other_db')
Similarly, for reading:
MyModel.objects.using('other_db').al...
Input must must read from the Update function.
Reference for all the available Keycode enum.
1. Reading key press with Input.GetKey:
Input.GetKey will repeatedly return true while the user holds down the specified key. This can be used to repeatedly fire a weapon while holding the specified key ...
The difference in months between two dates can be found using the MONTHS_BETWEEN( date1, date2 ):
SELECT MONTHS_BETWEEN( DATE '2016-03-10', DATE '2015-03-10' ) AS difference FROM DUAL;
Outputs:
DIFFERENCE
----------
12
If the difference includes part months then it will return the ...
Premise
The most confusing thing surrounding pointer syntax in C and C++ is that there are actually two different meanings that apply when the pointer symbol, the asterisk (*), is used with a variable.
Example
Firstly, you use * to declare a pointer variable.
int i = 5;
/* 'p' is a pointer to a...
POSIX/IEEE Open Group Base Specification says:
[2addr] s/BRE/replacement/flags
Substitute the replacement string for instances of the BRE in the
pattern space. Any character other than backslash or newline can
be used instead of a slash to delimit the BRE and the replacement.
Within the BRE a...
If your application is going to run on different devices, it's going to need to render to different ViewPorts, based on the device size. You can deal with this in two ways: with javascript rules, or CSS media styles. If you've been using a MVC or MVVM library, such as Angular or Ember (or Blaze, for...
There are three ways to set the classpath.
It can be set using the CLASSPATH environment variable :
set CLASSPATH=... # Windows and csh
export CLASSPATH=... # Unix ksh/bash
It can be set on the command line as follows
java -classpath ...
javac -classpath ...
Note ...
Suppose the following generic interface has been declared:
public interface MyGenericInterface<T> {
public void foo(T t);
}
Below are listed the possible ways to implement it.
Non-generic class implementation with a specific type
Choose a specific type to replace the formal type ...
Subtracting the values of two pointers to an object results in a signed integer *1. So it would be printed using at least the d conversion specifier.
To make sure there is a type being wide enough to hold such a "pointer-difference", since C99 <stddef.h> defines the type ptrdiff_t. ...
SELECT name, caption as title, year, pages FROM books
UNION
SELECT name, title, year, 0 as pages FROM movies
When combining 2 record sets with different columns then emulate the missing ones with default values.
