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commandButton/commandLink/ajax action/listener method not invoked or input value not set/updated
...auses.
Possible causes
UICommand and UIInput components must be placed inside an UIForm component, e.g. <h:form> (and thus not plain HTML <form>), otherwise nothing can be sent to the server. UICommand components must also not have type="button" attribute, otherwise it will be a dead bu...
CMake link to external library
...bfoo.so.
1. Find the library
You have to find the library. This is a good idea, even if you know the path to your library. CMake will error out if the library vanished or got a new name. This helps to spot error early and to make it clear to the user (may yourself) what causes a problem.
To find a ...
Node.js / Express.js - How does app.router work?
... I think I should explain at least what I think happens when working with middleware. To use middleware, the function to use is app.use() . When the middleware is being executed, it will either call the next middleware by using next() or make it so no more middleware get called. That means that t...
PHP: How to generate a random, unique, alphanumeric string for use in a secret link?
...s can affect the security of an application. In particular, rand() and uniqid() are not cryptographically secure random number generators. See Scott's answer for a secure alternative.
If you do not need it to be absolutely unique over time:
md5(uniqid(rand(), true))
Otherwise (given you have alr...
What is the behavior difference between return-path, reply-to and from?
...rcompany.com>
Subject: Super simple email
Reply-To: <coolstuff-threadId=123@mymailinglist.com>
This is a very simple body.
Now, let's say you are going to send it from a mailing list, that implements VERP (or some other bounce tracking mechanism that uses a different return-path). Lets...
Add native files from NuGet package to project output directory
...Dependency.dll
x64
NativeLib.dll
NativeLibDependency.dll
MyNugetPackageID.targets
lib
net40
ManagedAssembly.dll
The same x86 and x64 directories will be created in the project's output directory when built. If you don't need subdirectories then the ** and the %(RecursiveDir) can be remo...
How to use NULL or empty string in SQL
...
If you need it in SELECT section can use like this.
SELECT ct.ID,
ISNULL(NULLIF(ct.LaunchDate, ''), null) [LaunchDate]
FROM [dbo].[CustomerTable] ct
you can replace the null with your substitution value.
...
WebApi's {“message”:“an error has occurred”} on IIS7, not in IIS Express
...Simon's comment on this answer below.
TL;DR version
For me CustomErrors didn't really help. It was already set to Off, but I still only got a measly an error has occurred message. I guess the accepted answer is from 3 years ago which is a long time in the web word nowadays. I'm using Web API 2 and...
What is the meaning of the term arena in relation to memory?
...xample:
char * arena = malloc(HUGE_NUMBER);
unsigned int current = 0;
void * my_malloc(size_t n) { current += n; return arena + current - n; }
The point is that you get full control over how the memory allocation works. The only thing outside your control is the single library call for the init...
What is the use of interface constants?
...aces should be regarded as anomalies and
should not be emulated.
To avoid some pitfalls of the constant interface (because you can't prevent people from implementing it), a proper class with a private constructor should be preferred (example borrowed from Wikipedia):
public final class Constant...