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How to prevent form resubmission when page is refreshed (F5 / CTRL+R)
I have a simple form that submits text to my SQL table. The problem is that after the user submits the text, they can refresh the page and the data gets submitted again without filling the form again. I could redirect the user to another page after the text is submitted, but I want users to stay on ...
NSOperation vs Grand Central Dispatch
...les: bandwidth-constrained queues that only run N operations at a time; establishing dependencies between operations. Both very simple with NSOperation, very difficult with GCD.) Apple's done the hard work of leveraging GCD to create a very nice object-friendly API with NSOperation. Take advantage ...
Chaining multiple filter() in Django, is this a bug?
...ay suspect. It is how the WHERE and JOIN is placed.
Example1 (same joined table) :
(example from https://docs.djangoproject.com/en/dev/topics/db/queries/#spanning-multi-valued-relationships)
Blog.objects.filter(entry__headline__contains='Lennon', entry__pub_date__year=2008)
This will give you ...
Is there any way to put malicious code into a regular expression?
... spent begging the operating system for more space, and the attendant page-table set-up costs, can sometimes nudge the balancing scale further the other way and make the conversion from time to space less attractive than it would be.
– tchrist
Jan 19 '11 at 18:...
Boolean operators && and ||
... this here: http://en.wikipedia.org/wiki/Short-circuit_evaluation From the table on that page you can see that && is equivalent to AndAlso in VB.NET, which I assume you are referring to.
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Unit Testing C Code [closed]
...e.
AceUnit
AceUnit (Advanced C and Embedded Unit) bills itself as a comfortable C code unit test framework. It tries to mimick JUnit 4.x and includes reflection-like capabilities. AceUnit can be used in resource constraint environments, e.g. embedded software development, and importantly it runs fi...
When are you truly forced to use UUID as part of the design?
... the byte string. The hash method is not useful to you. It's used for hash tables and comparison operations internally within Ruby. All the methods for converting to and from various UUID representations are defined as class methods and should be prefixed with "parse".
– Bob Am...
What are the sizes used for the iOS application splash screen?
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i wish there was a nice table here with file name and image resolution for each entry, oh and forget iOS 5,6,7. we're in 2017.
– computingfreak
Jun 16 '17 at 2:32
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Microsoft Roslyn vs. CodeDom
...e, we've exposed public APIs on top:
Parser -> Syntax Tree API
Symbol Table/Metadata Import -> Symbol API
Binder -> Binding and Flow Analysis APIs
IL Emitter -> Emit API
Roslyn can be used as a sophisticated C# and VB source code generator, but that's where the similarity to CodeDom ...
Multiple inheritance/prototypes in JavaScript
...second, and so on. Once a property has been iterated, I store it in a hash table to avoid iterating it again.
Warning: This trap has been removed in ES7 draft and is deprecated in browsers.
The ownKeys trap is a trap for Object.getOwnPropertyNames(). Since ES7, for...in loops keep calling [[GetProto...