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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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What is the minimum valid JSON?

... to be one such example which only accepts objects and arrays as the root. PHP, on the other hand, specifically adds the exception that "it will also encode and decode scalar types and NULL". share | ...
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How does one output bold text in Bash?

...e sequences for example here: ascii-table.com/ansi-escape-sequences-vt-100.php share | improve this answer | follow | ...
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.NET HttpClient. How to POST string value?

... this works for me, work on php webservice that is calling $company_id = $_POST("company_id"); like that. If I send as json, php cannot work. – TPG Mar 19 at 8:38 ...
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String.Join method that ignores empty strings?

The VB.NET method String.Join(separator, stringArray) is similar to PHP's implode, but any null elements in the array are replaced with an empty string, so thatc: ...
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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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Why does struct alignment depend on whether a field type is primitive or user-defined?

... I think this is a bug. You are seeing the side-effect of automatic layout, it likes to align non-trivial fields to an address that's a multiple of 8 bytes in 64-bit mode. It occurs even when you explicitly apply the [StructLayout(LayoutKind.Sequential)] at...
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How to get a time zone from a location using latitude and longitude coordinates?

...-lookup-oss - JavaScript library GeoTimeZone - .NET library Geo-Timezone - PHP library timezonefinder - Python library ZoneDetect - C library Timeshape - Java library TimeZoneMap - Java and Android library lutz - R library go-tz - Go library Timezone lookup - Go library docker-timezone-lookup - doc...
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When to encode space to plus (+) or %20?

...ponent() does in JavaScript. Unfortunately it's not what urlencode does in PHP (rawurlencode is safer). See Also HTML 4.01 Specification application/x-www-form-urlencoded share | improve this answe...
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Intersection of two lists in Bash

... was awesome! I ran $ comm -12 <(git grep -il "\$this->error(" -- "*.php") <(git grep -il "Dash_Api_Json_Response" -- "*.php"), and luckily I ended up with the name of the file only that contained the trait. – localheinz Apr 7 '17 at 15:45 ...