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How to check file MIME type with javascript before upload?

I have read this and this questions which seems to suggest that the file MIME type could be checked using javascript on client side. Now, I understand that the real validation still has to be done on server side. I want to perform a client side checking to avoid unnecessary wastage of server res...
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Injecting $scope into an angular service function()

...e $rootScope). The purpose of a Scope is to "glue together" the presentation and the business logic of your app. It does not make much sense to pass a $scope into a service. Services are singleton objects used (among other things) to share data (e.g. among several controllers) and generally encap...
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Difference between a “coroutine” and a “thread”?

...executing at any given time (just like subroutines AKA procedures AKA functions -- they just pass the baton among each other more fluidly). Threads are (at least conceptually) a form of concurrent processing: multiple threads may be executing at any given time. (Traditionally, on single-CPU, sin...
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Determine a string's encoding in C#

...g used to decode it, you can usually get the bytes back without any corruption, though. – Nyerguds Jan 27 '18 at 13:44 ...
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Using Build Flavors - Structuring source folders and build.gradle correctly

... If you got in the Studio preferences, under the Gradle section, you can enable auto-import for your project (we'll enable this by default later). This will let Studio re-import your build.gradle whenever you edit it. Creating flavors doesn't mean...
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How to “warm-up” Entity Framework? When does it get “cold”?

No, the answer to my second question is not the winter. 5 Answers 5 ...
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How does lucene index documents?

...eveloperworks/library/wa-lucene/ Edit 12/2014: Updated to an archived version due to the original being deleted, probably the best more recent alternative is http://lucene.apache.org/core/3_6_2/fileformats.html There's an even more recent version at http://lucene.apache.org/core/4_10_2/core/org/ap...
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Is there an equivalent to background-size: cover and contain for image elements?

... Solution #1 - The object-fit property (Lacks IE support) Just set object-fit: cover; on the img . body { margin: 0; } img { display: block; width: 100vw; height: 100vh; object-fit: cover; } <img src="ht...
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Spring @Transactional - isolation, propagation

Can someone explain what isolation & propagation parameters are for in the @Transactional annotation via real-world example? ...
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Understanding offsetWidth, clientWidth, scrollWidth and -Height, respectively

There are several questions on StackOverflow regarding offsetWidth / clientWidth / scrollWidth (and -Height , respectively), but none give comprehensive explanation of what those values are. ...