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How to do something before on submit? [closed]

i have a form which has a button that submits the form. I need to do something before submits happen. I tried doing onClick on that button but it happens after the submit. ...
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What is the best way to call a script from another script?

... The usual way to do this is something like the following. test1.py def some_func(): print 'in test 1, unproductive' if __name__ == '__main__': # test1.py executed as script # do something some_func() service.py import te...
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How do I uninstall a Windows service if the files do not exist anymore?

How do I uninstall a .NET Windows Service, if the service files does not exists anymore? 13 Answers ...
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How do I instantiate a Queue object in java?

... interface. It is not needed except in those rare cases where you wish to do something special while providing the rest of your program with a Queue. public class MyQueue<T extends Tree> implements Queue<T> { public T element() { ... your code to return an element goes here ......
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Immutable vs Mutable types

... What? Floats are immutable? But can't I do x = 5.0 x += 7.0 print x # 12.0 Doesn't that "mut" x? Well you agree strings are immutable right? But you can do the same thing. s = 'foo' s += 'bar' print s # foobar The value of the variable changes, but it change...
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Bootstrap trying to load map file. How to disable it? Do I need to do it?

...hing is, I see in GH dev tools, that it's trying to get .map.css file. Why does it want to do so? How to disable it? Do I need to disable it? To not to have an error mark in dev tools, I added that map file, after which all styles are displayed as they defined in less files, which doesn't help me mu...
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How do I add comments to package.json for npm install?

... a simple package.json file and I want to add a comment. Is there a way to do this, or are there any hacks to make this work? ...
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Is assert evil? [closed]

... religious reasons, then just use goto rather than obfuscating what you're doing. In other words: if you can prove you really need goto, and the only alternative is to enact a load of pointless scaffolding that ultimately does the same thing but without alterting the Goto Police... then just use got...
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Remove last item from array

... Doesn't work for one-element arrays: [1].splice(-1, 1) => [1] – Tvaroh Nov 1 '14 at 8:38 144 ...
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Best way to do multiple constructors in PHP

...ruct functions with unique argument signatures in a PHP class. I'd like to do this: 21 Answers ...