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HTML5 form required attribute. Set custom validation message?
...therefore you must clear it before testing validity, you can't just set it and forget.
Further edit
As pointed out in @thomasvdb's comment below, you need to clear the custom validity in some event outside of invalid otherwise there may be an extra pass through the oninvalid handler to clear it.
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Python CSV error: line contains NULL byte
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print repr(open('my.csv', 'rb').read(200)) # dump 1st 200 bytes of file
and carefully copy/paste (don't retype) the result into an edit of your question (not into a comment).
Also note that if the file is really dodgy e.g. no \r or \n within reasonable distance from the start of the file, the li...
Why does volatile exist?
...s useless (The guy never sets the value! He's nuts, get rid of that code!) and my code would proceed without having acquired the semaphore, causing problems later on.
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How to supply value to an annotation from a Constant java
I am thinking this may not be possible in Java because annotation and its parameters are resolved at compile time. I have an interface as follows,
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How to insert element as a first child?
... the problem with this solution is that it inserts as the first child and not before the list children, if the parent container contains different children elements and one wants to insert before a specific group of child nodes, this will not work.
– Aurovrata
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Why is this program valid? I was trying to create a syntax error
... (Somehow I just managed to do such a bad commit.) So as a test program I randomly jotted this:
6 Answers
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How to switch to REPLACE mode in VIM
...eplace* *Replace-mode* *mode-replace*
Enter Replace mode with the "R" command in normal mode.
Of course you can map any key to R, for example by doing
:map <F5> R
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AttributeError: 'datetime' module has no attribute 'strptime'
...ould change the import statement to this:
from datetime import datetime
and access it as you are.
The people who made the datetime module also named their class datetime:
#module class method
datetime.datetime.strptime(date, "%Y-%m-%d")
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How to use enums in C++
...== Days.Saturday)
Because Days is not a scope, nor object. It is a type. And Types themselves don't have members. What you wrote is the equivalent to std::string.clear. std::string is a type, so you can't use . on it. You use . on an instance of a class.
Unfortunately, enums are magical and so ...
How to access the correct `this` inside a callback?
I have a constructor function which registers an event handler:
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