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jQuery get selected option value (not the text, but the attribute 'value')
...20: Corrected old answer
Use :selected psuedo selector on the selected options and then use the .val function to get the value of the option.
$('select[name=selector] option').filter(':selected').val()
Side note: Using filter is better then using :selected selector directly in the first query.
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mongodb, replicates and error: { “$err” : “not master and slaveOk=false”, “code” : 13435 }
...e allowing reads from a secondary. This is to protect you and your applications from performing eventually consistent reads by accident. You can do this in the shell with:
rs.slaveOk()
After that you can query normally from secondaries.
A note about "eventual consistency": under normal circumst...
Format numbers to strings in Python
...}:{seconds:02} {"pm" if hours > 12 else "am"}'
or the str.format function starting with 2.7:
"{:02}:{:02}:{:02} {}".format(hours, minutes, seconds, "pm" if hours > 12 else "am")
or the string formatting % operator for even older versions of Python, but see the note in the docs:
"%02d:%02...
What do 'real', 'user' and 'sys' mean in the output of time(1)?
... this is only CPU time used by the process. See below for a brief description of kernel mode (also known as 'supervisor' mode) and the system call mechanism.
User+Sys will tell you how much actual CPU time your process used. Note that this is across all CPUs, so if the process has multiple threa...
Dismiss keyboard by touching background of UITableView
...fault this will detect a "gesture" on a single tap so no further customization is required), specifying a target/action for when the gesture is fired, and then attaching the gesture recognizer object to your table view.
E.g. Perhaps in your viewDidLoad method:
UITapGestureRecognizer *gestureRecogn...
Removing pip's cache?
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If using pip 6.0 or newer, try adding the --no-cache-dir option.
If using pip older than pip 6.0, upgrade it with pip install -U pip.
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App Inventor 2 TaifunImage 拓展，图像高级处理功能，剪裁，压缩，翻转等 ...
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Check if a path represents a file or a folder
... // Check if it's a regular file
See File Javadoc
Or you can use the NIO class Files and check things like this:
Path file = new File(path).toPath();
boolean exists = Files.exists(file); // Check if the file exists
boolean isDirectory = Files.isDirectory(file); // Check if it's ...
Does Java have a using statement?
Does Java have a using statement that can be used when opening a session in hibernate?
12 Answers
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创建自定义 TinyWebDB 服务 · App Inventor 2 中文网
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