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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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Importance of varchar length in MySQL table
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+1. I've also seem some JDBC drivers that allocate enough space for the maximum size when setting up buffers to retrieve rows. Needless to say, this causes much angst and gnashing of teeth when some clown has just done varchar(50000) just in case someone has a really...
What characters are forbidden in Windows and Linux directory names?
...es. He used that directory for all manner of tests of pattern-matching and tokenization. (The test directory was of course created by a program.) For years afterwards, that directory was the bane of file-tree-walking programs; it tested them to destruction.
Note that the directory must have contai...
Best way to implement request throttling in ASP.NET MVC?
...sage that will be sent to the client upon throttling. You can include the token {n} to
/// show this.Seconds in the message, e.g. "Wait {n} seconds before trying again".
/// </summary>
public string Message { get; set; }
public override void OnActionExecuting(ActionExecutingC...
How can I create a two dimensional array in JavaScript?
...st dimension values initialized to run .map. Remember that Array will not allocate the positions until you order it to through .fill or direct value assignment.
var arr = Array(2).fill(null).map(() => Array(4));
arr[0][0] = 'foo';
console.info(arr);
Follow up
Here's a method tha...
Identify duplicates in a List
...timal solution (instead of sorting the input) then you'll also want to pre-allocate the size of the HashSet() objects. Without the preallocation, you don't get O(1) insert time when inserting into the HashSet(). This is because the internal hash array gets repeatedly resized. The inserts then averag...
How does the algorithm to color the song list in iTunes 11 work? [closed]
...hm to get the dominant color in the two lateral borders of a picture using PHP and Imagick.
https://gist.github.com/philix/5688064#file-simpleimage-php-L81
It's being used to fill the background of cover photos in http://festea.com.br
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Cell spacing in UICollectionView
... to zero.
UICollectionViewFlowLayout *flow = [[UICollectionViewFlowLayout alloc] init];
flow.itemSize = CGSizeMake(cellWidth, cellHeight);
flow.scrollDirection = UICollectionViewScrollDirectionHorizontal;
flow.minimumInteritemSpacing = 0;
flow.minimumLineSpacing = 0;
Also, if all your cells are t...
Disabling Chrome Autofill
...ield including labels and arbitrary text nodes. If there is a autocomplete token like street-address in context, Chrome will autofill that as such. The heuristic can be quite confusing as it sometimes only trigger if there are additional fields in the form, or not if there are too few fields in the ...
Create array of regex matches
...o past that size with calls to add() you will have to bear with the memory allocation and array copy -- and that might happen a few times. Granted, if you expect just a few matches then your approach is the more efficient one; if however you find that the array "resizing" happens more than once I wo...