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What exactly does the Access-Control-Allow-Credentials header do?
... control.
The client code must set the withCredentials property on the XMLHttpRequest to true in order to give permission.
However, this header alone is not enough. The server must respond with the Access-Control-Allow-Credentials header. Responding with this header to true means that the server a...
How to show math equations in general github's markdown(not github's blog)
...will help you find them.
given the following markdown syntax
it will display the following image
equation http://www.sciweavers.org/tex2img.php?eq=1%2Bs...
How to make a floated div 100% height of its parent?
...
For the parent:
display: flex;
You should add some prefixes http://css-tricks.com/using-flexbox/
Edit:
Only drawback is IE as usual, IE9 does not support flex.
http://caniuse.com/flexbox
Edit 2:
As @toddsby noted, align items is for parent, and its default value actually is stretch....
How to get the date from jQuery UI datepicker
...cted Date as String. Use parseDate to convert it to a JS Date Object.
See http://docs.jquery.com/UI/Datepicker for the full jQuery UI DatePicker reference.
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What are the lesser known but useful data structures?
...e a few:
Suffix tries. Useful for almost all kinds of string searching (http://en.wikipedia.org/wiki/Suffix_trie#Functionality). See also suffix arrays; they're not quite as fast as suffix trees, but a whole lot smaller.
Splay trees (as mentioned above). The reason they are cool is threefold:
...
Sending data back to the Main Activity in Android
...he startActivityForResult() method call
There is an example of this here:
http://developer.android.com/training/notepad/notepad-ex2.html
and in the "Returning a Result from a Screen" of this:
http://developer.android.com/guide/faq/commontasks.html#opennewscreen
...
How do I import the Django DoesNotExist exception?
...e_can_delete_discussion_response(self):
...snip...
self._driver.get("http://localhost:8000/questions/3/want-a-discussion")
try:
answer = Answer.objects.get(body__exact = '<p>User can reply to discussion.</p>'))
self.fail("Should not have reached here! Expected ...
Replace one character with another in Bash
...irst blank only
bar=${foo/ /.}
# replace all blanks
bar=${foo// /.}
See http://tldp.org/LDP/abs/html/string-manipulation.html for more details.
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Hidden features of Perl?
... Thanks for your insight.I've looked at some ways to have a bare http://... URL in Perl code without using a source filter,and didn't find a way.Maybe you can show how this is possible? // is used for regular expressions in Perl versions up to 5.8.x.In 5.10 it's repurposed for defined-or a...
Is there a better way to write this null check, and a non-empty check, in groovy?
...he best way to solve this issue is code above. It works since Groovy 1.8.1 http://docs.groovy-lang.org/docs/next/html/groovy-jdk/java/util/Collection.html#find(). Examples:
def lst1 = []
assert !lst1.find()
def lst2 = [null]
assert !lst2.find()
def lst3 = [null,2,null]
assert lst3.find()
def lst...