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Detect Safari using jQuery
...ari = /^((?!chrome|android).)*safari/i.test(navigator.userAgent);
Usage:
if (is_safari) alert('Safari');
Or for Safari only, use this :
if ( /^((?!chrome|android).)*safari/i.test(navigator.userAgent)) {alert('Its Safari');}
...
Why is exception.printStackTrace() considered bad practice?
...e() constitutes valid (not good/great) exception handling behavior, only
if you do not have System.err being reassigned throughout the duration of the application's lifetime,
and if you do not require log rotation while the application is running,
and if accepted/designed logging practice of the a...
Default value of 'boolean' and 'Boolean' in Java
...ery wrapper uses a reference which has a default of null. Primitives have different default values:
boolean -> false
byte, char, short, int, long -> 0
float, double -> 0.0
Note (2): void has a wrapper Void which also has a default of null and is it's only possible value (without using ...
How to scale an Image in ImageView to keep the aspect ratio
...o make the ImageView resize itself to fit the rescaled image. For example, if you have a rectangular image in what would normally be a square ImageView, adjustViewBounds=true will make it resize the ImageView to be rectangular as well. This then affects how other Views are laid out around the ImageV...
ASP.NET MVC Ajax Error handling
...
If the server sends some status code different than 200, the error callback is executed:
$.ajax({
url: '/foo',
success: function(result) {
alert('yeap');
},
error: function(XMLHttpRequest, textStatus,...
When to use Task.Delay, when to use Thread.Sleep?
... Thread.Sleep will block the current thread which causes a context switch. If you're using a thread pool this could also cause a new thread to be allocated. Both operations are quite heavy whereas the cooperative multi-tasking provided by Task.Delay etc is designed to avoid all of that overhead, max...
How do you connect to multiple MySQL databases on a single webpage?
...elow from @Troelskn
You can make multiple calls to mysql_connect(), but if the parameters are the same you need to pass true for the '$new_link' (fourth) parameter, otherwise the same connection is reused. For example:
$dbh1 = mysql_connect($hostname, $username, $password);
$dbh2 = mysql_connec...
Makefile variable as prerequisite
...
This will cause a fatal error if ENV is undefined and something needs it (in GNUMake, anyway).
.PHONY: deploy check-env
deploy: check-env
...
other-thing-that-needs-env: check-env
...
check-env:
ifndef ENV
$(error ENV is undefined)
endif
(Note t...
Get all non-unique values (i.e.: duplicate/more than one occurrence) in an array
I need to check a JavaScript array to see if there are any duplicate values. What's the easiest way to do this? I just need to find what the duplicated values are - I don't actually need their indexes or how many times they are duplicated.
...
Differences between action and actionListener
What is the difference between action and actionListener , and when should I use action versus actionListener ?
4 Ans...