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Check if element exists in jQuery [duplicate]
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Try this:
if ($("#mydiv").length > 0){
// do something here
}
The length property will return zero if element does not exists.
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Hand Coded GUI Versus Qt Designer GUI [closed]
...me the items in Designer and stick with the names to not break your code.
My assessment is that it's nowhere near as useful as Interface Builder on Mac OS X, but at this point, I could see using the Designer files directly in a program.
We haven't moved back to Designer since Qt3, but still use it...
Catch a thread's exception in the caller thread in Python
...equires only changing from Thread to ProagatingThread. And 4 space tabs so my copy/paste was trivial :-) ... the only improvement I'd suggest is using six.raise_from() so that you get a nice nested set of stack traces, instead of just the stack for the site of the reraise.
– ag...
NumPy: function for simultaneous max() and min()
... as of numpy 1.8 min and max are vectorized on amd64 platforms,on my core2duo numpy performs as well as this fortran code. But a single pass would be advantageous if the array exceed the size of the larger cpu caches.
– jtaylor
Mar 7 '14 at 13:58
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Reading 64bit Registry from a 32bit application
... access the 64-bit registry on Machine B. Before I passed that parameter, my program was reading the 32-bit after OpenRemoteBaseKey, and did not find the key I was after.
Note: In my test, the remote machine was actually my machine, but I accessed it via OpenRemoteBaseKey, just as I would for a d...
Custom toast on Android: a simple example
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My custom toast wasn't showing up because I was using the new Constraint Layout as my custom toast's rootview. Once I changed to Linear Layout, everything worked perfectly. So be warned...
– Charles Wo...
Double Iteration in List Comprehension
... answer help me understand what was happening, but it literally applied to my exact use case: counting the number of words in a list of sentences.
– Justin S
Jul 5 at 22:37
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A quick and easy way to join array elements with a separator (the opposite of split) in Java [duplic
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OK emphasis in my previous comment was used incorrectly. My point is that we can use it only for CharSequence elements like String (as example in question) but it would be good to add info that this method will not work for elements like Pe...
How to make the hardware beep sound in Mac OS X 10.6
... the sound itself, regardless of whether it came via software or hardware. My bad.
– Ian Dunn
Oct 22 '17 at 22:03
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How can I read large text files in Python, line by line, without loading it into memory?
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the question still is, "for line in infile" will load my 5GB of lines in to the memory? and, How can I read from tail?
– Bruno Rocha - rochacbruno
Jun 25 '11 at 2:31
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