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“Origin null is not allowed by Access-Control-Allow-Origin” error for request made by application ru
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edited Apr 8 '12 at 16:00
answered Sep 19 '10 at 6:06
ss...
What's the best way to set a single pixel in an HTML5 canvas?
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var d = id.data; // only do this once per page
d[0] = r;
d[1] = g;
d[2] = b;
d[3] = a;
myContext.putImageData( id, x, y );
Use fillRect() to draw a pixel (there should be no aliasing issues):
ctx.fillStyle = "rgba("+r+","+g+","+b+","+(a/255)+")";
ctx.fillRect...
How do I convert an interval into a number of hours with postgres?
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Probably the easiest way is:
SELECT EXTRACT(epoch FROM my_interval)/3600
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HTML anchor link - href and onclick both?
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130
Just return true instead?
The return value from the onClick code is what determines whether the...
ActiveRecord, has_many :through, and Polymorphic Associations
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edited Dec 5 '11 at 9:09
answered Nov 5 '09 at 23:53
Em...
I want to exception handle 'list index out of range.'
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answered Aug 10 '12 at 13:17
ThiefMasterThiefMaster
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NSDictionary - Need to check whether dictionary contains key-value pair or not
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edited Dec 20 '17 at 6:18
Tony Adams
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an...
Rails find record with zero has_many records associated [duplicate]
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Bah, found it here: https://stackoverflow.com/a/5570221/417872
City.includes(:photos).where(photos: { city_id: nil })
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XPath: How to select nodes which have no attributes?
...ath, how to select nodes which have no attributes (where attribute count = 0)?
3 Answers
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Python Dictionary Comprehension
... like.
>>> d = {n: n**2 for n in range(5)}
>>> print d
{0: 0, 1: 1, 2: 4, 3: 9, 4: 16}
If you want to set them all to True:
>>> d = {n: True for n in range(5)}
>>> print d
{0: True, 1: True, 2: True, 3: True, 4: True}
What you seem to be asking for is a way ...