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CSS Selector “(A or B) and C”?
...(.a .b) .c {
/* stuff goes here */
}
You can find more info on it here and here. Currently, most browsers support its initial version :any(), which works the same way, but will be replaced by :matches(). We just have to wait a little more before using this everywhere (I surely will).
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MongoDB: How to query for records where field is null or not set?
...not set then:
db.emails.count({sent_at: {$exists: false}})
If its there and null, or not there at all:
db.emails.count({sent_at: null})
Refer here for querying and null
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How do I remove leading whitespace in Python?
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The lstrip() method will remove leading whitespaces, newline and tab characters on a string beginning:
>>> ' hello world!'.lstrip()
'hello world!'
Edit
As balpha pointed out in the comments, in order to remove only spaces from the beginning of the string, lstrip(' ') s...
What's the difference between getPath(), getAbsolutePath(), and getCanonicalPath() in Java?
What's the difference between getPath() , getAbsolutePath() , and getCanonicalPath() in Java?
6 Answers
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CSS vertical alignment of inline/inline-block elements
I'm trying to get several inline and inline-block components aligned vertically in a div . How come the span in this example insists on being pushed down? I've tried both vertical-align:middle; and vertical-align:top; , but nothing changes.
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Custom error pages on asp.net MVC3
I'm developing a MVC3 base website and I am looking for a solution for handling errors and Render custom Views for each kind of error. So imagine that I have a "Error" Controller where his main action is "Index" (generic error page) and this controller will have a couple more actions for the errors ...
Bash script to set up a temporary SSH tunnel
...ly with an ssh 'control socket'. To talk to an already-running SSH process and get it's pid, kill it etc. Use the 'control socket' (-M for master and -S for socket) as follows:
$ ssh -M -S my-ctrl-socket -fnNT -L 50000:localhost:3306 jm@sampledomain.com
$ ssh -S my-ctrl-socket -O check jm@sampledo...
How to add a primary key to a MySQL table?
...ion of mysql are you on? (NOTE: I know it worked at the time I posted this and I believe it was 5.6... but I can't remember for sure)
– MER
Jul 18 '18 at 17:23
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How do I know the current width of system scrollbar?
...m.Windows.Forms.SystemInformation class members: HorizontalScrollBarHeight and VerticalScrollBarWidth.
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rsync exclude according to .gitignore & .hgignore & svn:ignore like --filter=:C
...itignore") which tells rsync to do a directory merge with .gitignore files and have them exclude per git's rules. You may also want to add your global ignore file, if you have one. To make it easier to use, I created an alias to rsync which included the filter.
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