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Using HTML5/Canvas/JavaScript to take in-browser screenshots
...http://hertzen.com/experiments/jsfeedback/
edit
The html2canvas script is now available separately here and some examples here.
edit 2
Another confirmation that Google uses a very similar method (in fact, based on the documentation, the only major difference is their async method of traversing/dra...
Summarizing multiple columns with dplyr? [duplicate]
...x. I have a data frame with different variables and one grouping variable. Now I want to calculate the mean for each column within each group, using dplyr in R.
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How do I auto-hide placeholder text upon focus using css or jquery?
...
Edit:
All browsers support now
input:focus::placeholder {
color: transparent;
}
<input type="text" placeholder="Type something here!">
Firefox 15 and IE 10+ also supports this now. To expand on Casey Chu's CSS solution:
input:fo...
The Role Manager feature has not been enabled
... After adding above to web.config roleManager is enabled. But now I am getting exception Unable to connect to SQL Server database
– Irfan Yusanif
Jan 4 '16 at 13:51
...
Using a dispatch_once singleton model in Swift
...ants (and variables), and is thread safe by the definition of let. This is now officially recommended way to instantiate a singleton.
Class constants were introduced in Swift 1.2. If you need to support an earlier version of Swift, use the nested struct approach below or a global constant.
Nested ...
How to “EXPIRE” the “HSET” child key in redis?
... this is why redis is such an awesome piece of software. they know where to keep it simple
– tObi
Jan 4 '19 at 21:25
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Understanding garbage collection in .NET
...ns, Debugging, General and untick the "Suppress JIT optimization" option.
Now run your program again and tinker with the source code. Note how the extra braces have no effect at all. And note how setting the variable to null makes no difference at all. It will always print "1". It now works the...
Transferring ownership of an iPhone app on the app store
...n app which we're going to be submitting to the store pretty soon, but we know that we'll be selling the app to another company in the near future. Does anyone have any experience with moving an app's ownership to another account?
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C#定点任务代码 类似Windows计划任务（健壮性高） - 更多技术 - 清泛网 - ...
...间隔
SetNextOnceDoInterval();
if (DateTime.Now.ToString("HH:mm").CompareTo(onceDoStr.Trim()) >= 0)
{
// 可能由于系统原因导致触发过早的，不执行
onceDoMain();
}
}
/// <summa...
C#定点任务代码 类似Windows计划任务（健壮性高） - 更多技术 - 清泛网 - ...
...间隔
SetNextOnceDoInterval();
if (DateTime.Now.ToString("HH:mm").CompareTo(onceDoStr.Trim()) >= 0)
{
// 可能由于系统原因导致触发过早的，不执行
onceDoMain();
}
}
/// <summa...