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how to stop browser back button using javascript
I am doing an online quiz app in php. I want to restrict the user from going back in an exam.
I have tried the following script but it stops my timer.
What should I do?
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In Markdown, what is the best way to link to a fragment of a page, i.e. #some_id?
...tup](#configuration) //Configuration
Where the latter version works both online in TFS and in the markdown preview of Visual Studio.
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How to deal with “java.lang.OutOfMemoryError: Java heap space” error?
... if I use different new thread, I am not getting OOM issue. All I can find online is increase heap size for AWT thread.
– Ashish
Feb 11 '19 at 5:43
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How to play with Control.Monad.Writer in haskell?
...t a similar message from trying the LYAH "For a few Monads More" using the online Haskell editor in repl.it
I changed the import from:
import Control.Monad.Writer
to:
import qualified Control.Monad.Trans.Writer.Lazy as W
So my code now works looking like this (with inspiration from Kwang's Ha...
Align two inline-blocks left and right on same line
...r {
display: flex;
justify-content: space-between;
}
Can be seen online here - http://jsfiddle.net/skip405/NfeVh/1073/
Note however that flexbox support is IE10 and newer. If you need to support IE 9 or older, use the following solution:
2.You can use the text-align: justify technique he...
In SQL Server, when should you use GO and when should you use semi-colon ;?
...;WITH ...
which I think looks really odd. I suppose it makes sense in an online forum when you can't tell the quality of code it will be pasted into.
Additionally, a MERGE statement must be terminated by a semi-colon. Do you see a pattern here? These are a couple of the newer additions to TSQL wh...
Best way to create unique token in Rails?
... else, and I want to keep it short. I've followed some examples I've found online and in the event of a collision, I think the code below will recreate the token, but I'm not real sure. I'm curious to see better suggestions, though, as this feels a little rough around the edges.
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Does MS SQL Server's “between” include the range boundaries?
...
The BETWEEN operator is inclusive.
From Books Online:
BETWEEN returns TRUE if the value of
test_expression is greater than or
equal to the value of begin_expression
and less than or equal to the value of
end_expression.
DateTime Caveat
NB: With DateTimes y...
When and why I should use session_regenerate_id()?
...s so, the attacker uses the predefined session ID value to assume the same online identity.
When To Use
When user is editing / updating some important inputs (changing passwords, credentials, forgot passwords etc.) which may compromise site security or privacy policy.
See also:
PHP Security Gu...
Simple way to calculate median with MySQL
...
I just found another answer online in the comments:
For medians in almost any SQL:
SELECT x.val from data x, data y
GROUP BY x.val
HAVING SUM(SIGN(1-SIGN(y.val-x.val))) = (COUNT(*)+1)/2
Make sure your columns are well indexed and the index is us...