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How to check 'undefined' value in jQuery
... One of my problems was: if you are doing something like this ("#myId"), make sure what do you really need: a. typeof ("#myId")=== "undefined" b. Or: typeof ("#myId").val() === "undefined"
– Alberici
Dec 26 '14 at 22:54
...
Node.js on multi-core machines
... on one box, one per core and split request traffic between them. This provides excellent CPU-affinity and will scale throughput nearly linearly with core count.
Scaling throughput on a webservice
Since v6.0.X Node.js has included the cluster module straight out of the box, which makes it easy ...
Pointers in C: when to use the ampersand and the asterisk?
...qually true if we want to modify a pointer value; if we write
int myFopen(FILE *stream) {stream = fopen("myfile.dat", "r"); }
...
FILE *in;
myFopen(in);
then we're modifying the value of the input parameter stream, not what stream points to, so changing stream has no effect on the value of in; in...
What is the difference between the | and || or operators?
... = 10 (0X02) Read-Write = 11 (0X03). One useful example would be opening files. A simple example would be:
File.Open(FileAccess.Read | FileAccess.Write); //Gives read/write access to the file
|| is a logical OR. This is the way most people think of OR and compares two values based on their...
How to rethrow InnerException without losing stack trace in C#?
...I heard that it depends if the exception was thrown and caught in the same file. If it's the same file, the stack trace will be lost, if it's another file, it will be preserved.
– jahu
Oct 1 '19 at 10:26
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Express.js: how to get remote client address
...u should have proxy_set_header X-Forwarded-For $remote_addr in your config file
– Kamagatos
Aug 8 '14 at 3:29
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Position: absolute and parent height?
...vely positioned. How to set containers height so their children will be inside of them?
6 Answers
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IllegalStateException: Can not perform this action after onSaveInstanceState with ViewPager
...
Please check my answer here. Basically I just had to :
@Override
protected void onSaveInstanceState(Bundle outState) {
//No call for super(). Bug on API Level > 11.
}
Don't make the call to super() on the saveInstanceState method. This was messing things up...
This is a known...
Why should I use document based database instead of relational database?
...h exists sometime (customer number, supplier number, order number, keep on file until, OCRed fulltext, etc). Usually you do not know in advance which metadata fields you will add within the next two years.
Things like CouchDB work much nicer for that kind of data than relational databases.
I also p...
What are the Android SDK build-tools, platform-tools and tools? And which version should be used?
...fic version by using the sdk.buildtools property in the project.properties file.
There seems to be no official page explaining all the build tools. Here is what the Android team says about this.
The [build] tools, such as aidl, aapt, dexdump, and dx, are
typically called by the Android build ...