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How to dynamically change a web page's title?
I have a webpage that implements a set of tabs each showing different content. The tab clicks do not refresh the page but hide/unhide contents at the client side.
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How to prevent form resubmission when page is refreshed (F5 / CTRL+R)
...);
//and check it against the stored value:
$sessionMessageIdent = isset($_SESSION['messageIdent'])?$_SESSION['messageIdent']:'';
if($messageIdent!=$sessionMessageIdent){//if its different:
//save the session var:
$_SESSION['messageIdent'] = $messageIdent;
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How to get the current time as datetime
... choose which date and time components are needed
let requestedComponents: Set<Calendar.Component> = [
.year,
.month,
.day,
.hour,
.minute,
.second
]
// get the components
let dateTimeComponents = userCalendar.dateComponents(requestedComponents, from: currentDateTime)
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Clicking the back button twice to exit an activity
...ToExitPressedOnce = false }, 2000)
}
I Think this handler helps to reset the variable after 2 second.
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When is del useful in python?
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Deleting a variable is different than setting it to None
Deleting variable names with del is probably something used rarely, but it is something that could not trivially be achieved without a keyword. If you can create a variable name by writing a=1, it is nice ...
What are the sizes used for the iOS application splash screen?
...n Xcode 11, you can provide only one image with 1x, 2x, and 3x scales then set it in LaunchScreen.storyboard to fill up the screen and everything goes well!
For Example: (1242pt x 2688pt @1x)
This is the portrait screen size of iPhone 11 Pro Max which is the large iPhone screen size yet so it will...
What is the size of column of int(11) in mysql in bytes?
... It you don't provide a length for integer fields, MySQL will set a default value (tinyint 4, smallint 6, mediumint 9, int 11, bigint 20) It is worthy to note that these default lengths are enough to display any number that can be stored in this field (ex : smallint max value is 2^16 = ...
How to parse JSON in Java
...g.json is amongst the worst json libraries. One should look at the feature set and performance of available json libraries before choosing. Here is a benchmark I did comparing jackson, gson, org.json, genson using JMH: github.com/fabienrenaud/java-json-benchmark. jackson is the clear winner here.
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What is difference between CrudRepository and JpaRepository interfaces in Spring Data JPA?
...g Data core library ships with two base interfaces that expose a dedicated set of functionalities:
CrudRepository - CRUD methods
PagingAndSortingRepository - methods for pagination and sorting (extends CrudRepository)
Store-specific interfaces
The individual store modules (e.g. for JPA or Mongo...
TypeError: 'NoneType' object is not iterable in Python
...
Another thing that can produce this error is when you are setting something equal to the return from a function, but forgot to actually return anything.
Example:
def foo(dict_of_dicts):
for key, row in dict_of_dicts.items():
for key, inner_row in row.items():
...