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Using jQuery to test if an input has focus
...filter out false positives like body. This way, we make sure to filter out all elements except form controls and hyperlinks.
You're defining a new selector. See Plugins/Authoring. Then you can do:
if ($("...").is(":focus")) {
...
}
or:
$("input:focus").doStuff();
Any jQuery
If you just wa...
Solving “Who owns the Zebra” programmatically?
...ution in Python based on constraint-programming:
from constraint import AllDifferentConstraint, InSetConstraint, Problem
# variables
colors = "blue red green white yellow".split()
nationalities = "Norwegian German Dane Swede English".split()
pets = "birds dog cats horse zebra".sp...
Can I set a breakpoint on 'memory access' in GDB?
...
What you're looking for is called a watchpoint.
Usage
(gdb) watch foo: watch the value of variable foo
(gdb) watch *(int*)0x12345678: watch the value pointed by an address, casted to whatever type you want
(gdb) watch a*b + c/d: watch an arbitrarily complex expression, valid in the progra...
Can't use method return value in write context
... functions.
However, the real problem you have is that you use empty() at all, mistakenly believing that "empty" value is any different from "false".
Empty is just an alias for !isset($thing) || !$thing. When the thing you're checking always exists (in PHP results of function calls always exist), ...
What is the significance of #pragma marks? Why do we need #pragma marks?
...oes their location in .m files matter? Should some #pragma come before all others?
7 Answers
...
Extracting specific columns in numpy array
This is an easy question but say I have an MxN matrix. All I want to do is extract specific columns and store them in another numpy array but I get invalid syntax errors.
Here is the code:
...
Disable autocomplete via CSS
... it possible to use CSS to disable autocomplete on a form element (specifically a textfield)?
12 Answers
...
List all the modules that are part of a python package?
Is there a straightforward way to find all the modules that are part of a python package? I've found this old discussion , which is not really conclusive, but I'd love to have a definite answer before I roll out my own solution based on os.listdir().
...
How to create a tag with Javascript?
...
FYI, document.head is supported in all major browsers.
– Rob W
Feb 23 '12 at 18:12
30
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Difference between a theta join, equijoin and natural join
...
A theta join allows for arbitrary comparison relationships (such as ≥).
An equijoin is a theta join using the equality operator.
A natural join is an equijoin on attributes that have the same name in each relationship.
Additionally,...