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Prevent double submission of forms in jQuery
...ent so that duplicate submissions are harmless.
Eg, if the form creates an order, put a unique ID in the form. The first time the server sees an order creation request with that id, it should create it and respond "success". Subsequent submissions should also respond "success" (in case the client di...
Difference between Key, Primary Key, Unique Key and Index in MySQL
...trieval. An index is typically created on columns used in JOIN, WHERE, and ORDER BY clauses.
Imagine you have a table called users and you want to search for all the users which have the last name 'Smith'. Without an index, the database would have to go through all the records of the table: this i...
Are the PUT, DELETE, HEAD, etc methods available in most web browsers?
...ere's the bug if you want to follow along at home: w3.org/Bugs/Public/show_bug.cgi?id=10671
– Emil Lerch
Oct 21 '11 at 17:43
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show 12 more...
Is there any publicly accessible JSON data source to test with real world data? [closed]
..., for example -
A GET request to:
https://api.twitter.com/1/statuses/user_timeline.json?include_entities=true&include_rts=true&screen_name=mralexgray&count=1,
EDIT: Removed due to twitter restricting their API with OAUTH requirements...
{"errors": [{"message": "The Twitter REST API...
Where are my postgres *.conf files?
...tart)
# - When to Log -
#client_min_messages = notice # values in order of decreasing detail:
# debug5
# debug4
# debug3
# debug2
# debug1
# log
...
What does the term “porcelain” mean in Git?
...interface to Porcelain commands on the other hand are subject to change in order to improve the end user experience.
See "How do I programmatically determine if there are uncommitted changes?" as an example to using plumbing commands instead of porcelain ones.
Note: A porcelain command can have...
What's the most efficient way to erase duplicates and sort a vector?
...fficient than using a set. I added a new more efficient method, using an unordered_set.
Keep in mind that the unordered_set method only works if you have a good hash function for the type you need uniqued and sorted. For ints, this is easy! (The standard library provides a default hash which is sim...
How to make good reproducible pandas examples
...4, 6]], columns=['A', 'B'])
or make it "copy and pasteable" using pd.read_clipboard(sep='\s\s+'), you can format the text for Stack Overflow highlight and use Ctrl+K (or prepend four spaces to each line), or place three tildes above and below your code with your code unindented:
In [2]: df
Out[2]...
How to know/change current directory in Python shell?
...now how to change.
edit
Under Windows:
set PYTHONPATH=%PYTHONPATH%;C:\My_python_lib
(taken from http://docs.python.org/using/windows.html)
edit 2
... and even better: use virtualenv and virtualenv_wrapper, this will allow you to create a development environment where you can add module paths ...
Default text which won't be shown in drop-down list
...
Kyle's solution worked perfectly fine for me so I made my research in order to avoid any Js and CSS, but just sticking with HTML.
Adding a value of selected to the item we want to appear as a header forces it to show in the first place as a placeholder.
Something like:
<option selected dis...