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扩展App Inventor：具有多点触控和手势检测功能 · App Inventor 2 中文网
... by dragging a block and adding corresponding actions they want when a specific event occurs.
Unlike the traditional text-based programming, MIT App Inventor introduces an event-driven programming model. “Event” is a concept in computer science which refers to the user’s action, such as touch...
Prevent line-break of span element
... content, and as necessary to fill line boxes.
inherit
Takes the same specified value as the property for the element's parent.
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Is there a way to instantiate a class by name in Java?
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Two ways:
Method 1 - only for classes having a no-arg constructor
If your class has a no-arg constructor, you can get a Class object using Class.forName() and use the newInstance() method to create an instance (though beware that this method is often considered evil because it can defeat Ja...
How to get and set the current web page scroll position?
...ound this: articles.sitepoint.com/article/javascript-from-scratch/6 and modified the getScrollingPosition() to store the values in hidden variables. Then in the html of the refreshed page I use <body onLoad="window.scrollTo(x,y), where x and y are those from the hidden values values!
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Is it possible to pass query parameters via Django's {% url %} template tag?
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{% url 'order_list' %}?office=foobar&{{ request.GET.urlencode }}
Modify your settings to have request variable:
from django.conf.global_settings import TEMPLATE_CONTEXT_PROCESSORS as TCP
TEMPLATE_CONTEXT_PROCESSORS = TCP + (
'django.core.context_processors.request',
)
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Using Position Relative/Absolute within a TD?
...elves (for example, it was unclear how should the borders of the td behave if it is shifted via position:relative in case of border-collapse:collapse). It didn't exclude them from possible containing blocks of the absolutely positioned descendants. So the behavior of Firefox turned out to be just a ...
Why there is no ConcurrentHashSet against ConcurrentHashMap
...etFromMap which required you to pass in an empty map object. But it is specific to ConcurrentHashMap.
Anyway, the Java designers could have created a new set interface every time a new map interface was created, but that pattern would be impossible to enforce when third parties create their own map...
csv.Error: iterator should return strings, not bytes
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You open the file in text mode.
More specifically:
ifile = open('sample.csv', "rt", encoding=<theencodingofthefile>)
Good guesses for encoding is "ascii" and "utf8". You can also leave the encoding off, and it will use the system default encoding, which t...
Simple regular expression for a decimal with a precision of 2
...tically, I think a precision 2 number should always have two decimals even if the last is zero. This is based on my experience with significant figures so it could be wrong, but you don't actually know if 1.7 is 1.70 or any number from 1.70 to 1.74.
– paxdiablo
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Is there a better way to iterate over two lists, getting one element from each list for each iterati
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what if additionally I want the index i? Can I wrap that zip in enumerate?
– Charlie Parker
Mar 6 '18 at 18:06
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