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How does JavaScript handle AJAX responses in the background?
...
xhr.onload = function( e ) {
console.log(t() + ': step 3');
alert(this.response.substr(0,20));
};
console.log(t() + ': step 1');
xhr.send();
console.log(t() + ': step 2');
after an AJAX request is made (- after step 1),
then while your js code proceeds executing (step 2 an...
Javascript regex returning true.. then false.. then true.. etc [duplicate]
...egExp. In JavaScript, global regexen have state: you call them (with exec, test etc.) the first time, you get the first match in a given string. Call them again and you get the next match, and so on until you get no match and it resets to the start of the next string. You can also write regex.lastIn...
Can PostgreSQL index array columns?
...e the array operators and the GIN-index type.
Example:
CREATE TABLE "Test"("Column1" int[]);
INSERT INTO "Test" VALUES ('{10, 15, 20}');
INSERT INTO "Test" VALUES ('{10, 20, 30}');
CREATE INDEX idx_test on "Test" USING GIN ("Column1");
-- To enforce index usage because we hav...
When to use enumerateObjectsUsingBlock vs. for
...ion allows the collection class to enumerate contents as quickly as the fastest traversal of the native storage format. Likely irrelevant for arrays, but it can be a huge difference for dictionaries.
"Don't use enumerateObjectsUsingBlock when you need to modify local variables" - not true; you can ...
Is there a short contains function for lists?
...le list comprehension.
list_does_contain = next((True for item in list_to_test if item == test_item), False)
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Circle line-segment collision detection algorithm?
...e ray,
L is the end point of the ray,
C is the center of sphere you're testing against
r is the radius of that sphere
Compute:
d = L - E ( Direction vector of ray, from start to end )
f = E - C ( Vector from center sphere to ray start )
Then the intersection is found by..
Plugging:
P = E ...
How to identify numpy types in python?
...ion.) And if you want pandas DataFrames to count as numpyish, add an or to test for that. And so on. The point is, you have to know what you're actually asking for when you want to do something as unusual as loose manual type switching, but once you know, it's easy to implement.
...
Can a unit test project load the target application's app.config file?
I am unit testing a .NET application (.exe) that uses an app.config file to load configuration properties. The unit test application itself does not have an app.config file.
...
QUERY_STRING、REQUEST_URI、SCRIPT_NAME、PHP_SELF区别 - 更多技术 - 清泛...
...
$_SERVER['PHP_SELF'] = "/aaa/index.php";
3、http://localhost/tag/test → http://localhost/index.php?m=tag&tag=test（URL重写）
$_SERVER['QUERY_STRING'] = "m=tag&tag=test";
$_SERVER['REQUEST_URI'] = "/tag/test";
$_SERVER['SCRIPT_NAME'] = "/index.php";
$_SERVER['PHP_SELF'] ...
Django: Get an object form the DB, or 'None' if nothing matches
... @emispowder, what if I don't want to return None, I want to return an alert message like "no matching data" displaying on the SAME page?
– Héléna
Nov 4 '15 at 5:41
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