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Change select box option background color
...0 rgba(0, 0, 0, 0.4);
}
select option[value="1"] {
background: rgba(100, 100, 100, 0.3);
}
select option[value="2"] {
background: rgba(150, 150, 150, 0.3);
}
select option[value="3"] {
background: rgba(200, 200, 200, 0.3);
}
select option[value="4"] {
background: rgba(250...
How to select rows that have current day's timestamp?
...estamp` datetime --- index timestamp
, data VARCHAR(100) NOT NULL
DEFAULT 'Sample data'
, PRIMARY KEY (id)
, INDEX t_IX (`timestamp`, id)
) ;
INSERT INTO test
(`timestamp`)
VALUES
('2013-02-08 00:01:12'),
--- ...
What does auto do in margin:0 auto?
...;
margin-right:auto;
Therefore, to give you an example, if the parent is 100px and the child is 50px, then the auto property will determine that there's 50px of free space to share between margin-left and margin-right:
var freeSpace = 100 - 50;
var equalShare = freeSpace / 2;
Which would give: ...
Disable LESS-CSS Overwriting calc() [duplicate]
...
Using an escaped string (a.k.a. escaped value):
width: ~"calc(100% - 200px)";
Also, in case you need to mix Less math with escaped strings:
width: calc(~"100% - 15rem +" (10px+5px) ~"+ 2em");
Compiles to:
width: calc(100% - 15rem + 15px + 2em);
This works as Less concatenates ...
How to implement history.back() in angular.js
... it to work by using:
setTimeout(function() {
$window.history.back();
},100);
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How can I propagate exceptions between threads?
...ion purposes. */
std::this_thread::sleep_for(std::chrono::milliseconds(100));
for (int i=2; i < n; ++i) { if (n % i == 0) return false; }
return (n >= 2);
}
int worker()
{
static std::atomic<int> hundreds(0);
const int start = 100 * hundreds++;
const int end = st...
Is there an equivalent to background-size: cover and contain for image elements?
...the img .
body {
margin: 0;
}
img {
display: block;
width: 100vw;
height: 100vh;
object-fit: cover;
}
<img src="http://lorempixel.com/1500/1000" />
See MDN - regarding object-fit: cover:
The replaced content is sized to maintain its aspect ratio while
filli...
Checking if an instance's class implements an interface?
...h:
Given an instance of an object
Object construction outside the loop (100,000 iterations)
____________________________________________
| class_implements | Reflection | instanceOf |
|------------------|------------|------------|
| 140 ms | 290 ms | 35 ms |
'-----------------...
scrollIntoView Scrolls just too far
...relative;">
<div id="anchor-name" style="position: absolute; top: -100px; left: 0"></div>
</div>
Now the offset is specified as -100px relative to the element. Create a function to create this anchor for code reuse, or if you are using a modern JS framework such as React do t...
How to open, read, and write from serial port in C?
..."hello!\n", 7); // send 7 character greeting
usleep ((7 + 25) * 100); // sleep enough to transmit the 7 plus
// receive 25: approx 100 uS per char transmit
char buf [100];
int n = read (fd, buf, sizeof buf); // read up to 100 characters i...