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Using the HTML5 “required” attribute for a group of checkboxes?
...'s a bit I pulled together for JQuery users, including a custom validation error message:
$cbx_group = $("input:checkbox[name^='group']");
$cbx_group.on("click", function() {
if ($cbx_group.is(":checked")) {
// checkboxes become unrequired as long as one is checked
$cbx_group.pr...
Is file append atomic in UNIX?
In general, what can we take for granted when we append to a file in UNIX from multiple processes? Is it possible to lose data (one process overwriting the other's changes)? Is it possible for data to get mangled? (For example, each process is appending one line per append to a log file, is it po...
How do I enable EF migrations for multiple contexts to separate databases?
...run Enable-Migrations in the PM console (Visual Studio 2012), there's an error because of there being multiple contexts:
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How to create a DataTable in C# and how to add rows?
...meters in exact same order as the columns were defined, else you'll get an error. (So use with caution!)
– Funka
Jan 29 '13 at 19:41
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Access denied for user 'root'@'localhost' while attempting to grant privileges. How do I grant privi
...ord mentioned in here, here, here, and here, no clue. I still get the same error:
ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: YES)
I'm able to connect normally, show all databases, do selects and inserts, create and add users, and but when it comes to GRANT, I'm...
Ruby send vs __send__
... Example:
A, B, C = Module.new, Module.new, Module.new
B.include A #=> error -- private method
B.send :include, A #=> bypasses the method's privacy
C.public_send :include, A #=> does not bypass privacy
Update: Since Ruby 2.1, Module#include and Module#extend methods become public, so the...
Does ruby have real multithreading?
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answered Sep 11 '08 at 9:05
Josh MooreJosh Moore
12.8k1414 gold badges5454 silver badges7272 bronze badges
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How can a Javascript object refer to values in itself? [duplicate]
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answered May 7 '10 at 9:05
Delan AzabaniDelan Azabani
70.4k2222 gold badges154154 silver badges189189 bronze badges
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Loop backwards using indices in Python?
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yes, PEP-322 gives us a clear and least error-prone way to reverse iterations.
– Allen Shen
Jul 31 '19 at 20:25
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Getting the last element of a list
...list
[1, 3, 5]
Note that getting a list item by index will raise an IndexError if the expected item doesn't exist. This means that some_list[-1] will raise an exception if some_list is empty, because an empty list can't have a last element.
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