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JavaScript validation for empty input field
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123
<script type="text/javascript">
function validateForm() {
var a = document.f...
CGContextDrawImage draws image upside down when passed UIImage.CGImage
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Good point, though mostly you don't need custom alpha levels for drawing an image (typically those are baked into images ahead of time for things that need alpha). Basically my motto is, use a little code as you can because more code means more...
App Inventor 2 低功耗蓝牙(BLE) 硬件接入、数据通信及IO控制 · App Inventor 2 中文网
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Python's most efficient way to choose longest string in list?
...the Python documentation itself, you can use max:
>>> mylist = ['123','123456','1234']
>>> print max(mylist, key=len)
123456
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How to remove leading zeros using C#
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This is the code you need:
string strInput = "0001234";
strInput = strInput.TrimStart('0');
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Repeat a task with a time delay?
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You should use Handler's postDelayed function for this purpose. It will run your code with specified delay on the main UI thread, so you will be able to update UI controls.
private int mInterval = 5000; // 5 seconds by default, can be changed later
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Best way to determine user's locale within browser
...as the user's preferred language(s). On IE you instead get systemLanguage (OS installed language), browserLanguage (same as language) and userLanguage (user configured OS region), which are all similarly unhelpful.
If I had to choose between those properties, I'd sniff for userLanguage first, falli...
How can I launch multiple instances of MonoDevelop on the Mac?
...ew MonoDevelop instance to work on a different project on the Mac, and the OS is currently preventing me from opening a new instance.
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What does the brk() system call do?
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In the diagram you posted, the "break"—the address manipulated by brk and sbrk—is the dotted line at the top of the heap.
The documentation you've read describes this as the end of the "data segment" because in traditional (pre-shared-lib...
Remove file extension from a file name string
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String.LastIndexOf would work.
string fileName= "abc.123.txt";
int fileExtPos = fileName.LastIndexOf(".");
if (fileExtPos >= 0 )
fileName= fileName.Substring(0, fileExtPos);
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