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Python decorators in classes
...orator in some debugging situations, it allows overriding class properties by decorating, without having to find the calling function.
class myclass(object):
def __init__(self):
self.property = "HELLO"
@adecorator(property="GOODBYE")
def method(self):
print self.propert...
Maintain/Save/Restore scroll position when returning to a ListView
...
I adopted the solution suggested by @(Kirk Woll), and it works for me. I have also seen in the Android source code for the "Contacts" app, that they use a similar technique. I would like to add some more details:
On top on my ListActivity-derived class:
pri...
No route matches “/users/sign_out” devise rails 3
...nk a DELETE RESTful call requires an html attribute data-method = "delete" by using the rails code = link_to('Logout', destroy_user_session_path, :method => :delete).
However, if you do not have the gem jquery-ujs installed or are not calling the resulting javascript in your application.html vi...
Usage of protocols as array types and function parameters in swift
... set} // Since elements need to distinguished,
//we will assume it is by name in this example.
func bla()
}
class SomeClass {
//var protocols = [SomeProtocol]() //find is not supported in 2.0, indexOf if
// There is an Obj-C function index, that find element using custom comparat...
How to write a:hover in inline CSS?
...http://wherever.com/yourstylesheet.css");
var head = document.getElementsByTagName("head")[0];
head.appendChild(link);
</script>
Caution: the above assumes there is a head section.
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public static const in TypeScript
...ke a static constant value in modern browsers (in that it can't be changed by other code), you could add a get only accessor to the Library class (this will only work for ES5+ browsers and NodeJS):
export class Library {
public static get BOOK_SHELF_NONE():string { return "None"; }
public s...
Handling specific errors in JavaScript (think exceptions)
...
Only supported by Firefox (since 2.0). It does not even parse in other browsers; you only get syntax errors.
– Crescent Fresh
Sep 16 '09 at 15:26
...
Get all unique values in a JavaScript array (remove duplicates)
...If you want to keep the last occurrence of a value, simple replace indexOf by lastIndexOf.
With ES6 it could be shorten to this:
// usage example:
var myArray = ['a', 1, 'a', 2, '1'];
var unique = myArray.filter((v, i, a) => a.indexOf(v) === i);
console.log(unique); // unique is ['a', 1, 2, ...
How can I set the color of a selected row in DataGrid
...Style wasn't even setting the background color, which was instead bing set by the RowBackground and AlternateRowBackground properties. Nevertheless, trying to set the background colour of the selected row did not work at all when I did this:
<DataGrid ... >
<DataGrid.RowBac...
Android Fragment lifecycle over orientation changes
... massive pain in the rear most of the time.
You can stop errors occurring by using the same Fragment rather than recreating a new one. Simply add this code:
if (savedInstanceState == null) {
// only create fragment if activity is started for the first time
mFragmentManager = getSupportFrag...