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Check if element is visible in DOM
... page, might look like:
// Where el is the DOM element you'd like to test for visibility
function isHidden(el) {
return (el.offsetParent === null)
}
On the other hand, if you do have position fixed elements that might get caught in this search, you will sadly (and slowly) have to use window.g...
Track the time a command takes in UNIX/LINUX?
...
Yes, use time <command>, such as
time ls
Consult man time for more options. Link.
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Static implicit operator
...as the argument, and returning a valid XElement as the result.
It's a way for you as a developer to tell the compiler:
"even though these look like two totally unrelated types, there is actually a way to convert from one to the other; just let me handle the logic for how to do it."
...
CATALINA_OPTS vs JAVA_OPTS - What is the difference?
..._OPTS - which are both used in the catalina.sh startup and shutdown script for Tomcat. They are described in comments within that file as:
[JAVA_OPTS]: (optional) Java runtime options used when the "start", "stop" or "run"
command is executed
and
[CATALINA_OPTS]: (optional) Java runtime...
Understand homebrew and keg-only dependencies
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For a software to be "keg-only" means it is installed in /usr/local/Cellar but not linked into places like /usr/local/bin, /usr/local/lib, etc. That means other software that depends on it has to be compiled with specific ins...
In Perl, how can I read an entire file into a string?
...
Add:
local $/;
before reading from the file handle. See How can I read in an entire file all at once?, or
$ perldoc -q "entire file"
See Variables related to filehandles in perldoc perlvar and perldoc -f local.
Incidentally, if you can pu...
curl json post request via terminal to a rails app
...er on my rails app with a curl command from os x terminal. No matter how I format the data, the app returns a responses that non of my validations have passed.
...
Parse RSS with jQuery
...le Feed API is officially deprecated and doesn't work anymore!
No need for a whole plugin. This will return your RSS as a JSON object to a callback function:
function parseRSS(url, callback) {
$.ajax({
url: document.location.protocol + '//ajax.googleapis.com/ajax/services/feed/load?v=1.0&...
Java Enum Methods - return opposite direction enum
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For those lured here by title: yes, you can define your own methods in your enum. If you are wondering how to invoke such non-static method, you do it same way as with any other non-static method - you invoke it on instance o...
connecting to MySQL from the command line
...history and process tables. If you leave out the password it will ask you for it.
– dj_segfault
Feb 27 '11 at 7:16
@M...