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Warn user before leaving web page with unsaved changes
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Short, wrong answer:
You can do this by handling the beforeunload event and returning a non-null string:
window.addEventListener("beforeunload", function (e) {
var confirmationMessage = 'It looks like you have been editing something. '
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Func delegate with no return type
... the Action delegates return void.
Func<TResult> takes no arguments and returns TResult:
public delegate TResult Func<TResult>()
Action<T> takes one argument and does not return a value:
public delegate void Action<T>(T obj)
Action is the simplest, 'bare' delegate:
pu...
Location of parenthesis for auto-executing anonymous JavaScript functions?
...ing the current version of json2.js with the version I had in my project and noticed a difference in how the function expression was created and self executed.
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What is the best way to dump entire objects to a log in C#?
... It also doesn't work for arrays (it just displays the type and the length of the array, but doesn't print its contents).
– Konrad Morawski
Sep 20 '12 at 6:57
5
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How do I include negative decimal numbers in this regular expression?
...\d*(\.\d+)?$
I verified it in Rubular with these values:
10.00
-10.00
and both matched as expected.
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Is the primary key automatically indexed in MySQL?
...implicit when defining the primary key? Is the answer the same for MyISAM and InnoDB?
9 Answers
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What is the difference between NULL, '\0' and 0?
...e appear to be differences between various values of zero -- NULL , NUL and 0 .
11 Answers
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Difference between save and saveAndFlush in Spring data jpa
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On saveAndFlush, changes will be flushed to DB immediately in this command. With save, this is not necessarily true, and might stay just in memory, until flush or commit commands are issued.
But be aware, that even if you flush th...
Is it acceptable and safe to run pip install under sudo?
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I don't understand why this is the best answer. The question is NOT about virtual environments. It's about validity of using sudo pip install. Let's say I need to install some package that I'll use in many projects or at system level. Such ...
SignalR: Why choose Hub vs. Persistent Connection?
I've been searching and reading up on SignalR recently and, while I see a lot of explanation of what the difference is between Hubs and Persistent Connections I haven't been able to get my head around the next level, which is why would I choose one approach over the other?
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