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How to distinguish mouse “click” and “drag”
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I think the difference is that there is a mousemove between mousedown and mouseup in a drag, but not in a click.
You can do something like this:
const element = document.createElement('div')
element.innerHTML = 'test'
document.body.appe...
How do I erase an element from std::vector by index?
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With advance you must save the iterator in a variable. If you use std::next you can do it in one line: vec.erase( next(begin(vec), 123) );
– dani
Oct 5 '16 at 20:36
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.Net HttpWebRequest.GetResponse() raises exception when http status code 400 (bad request) is return
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It would be nice if there were some way of turning off "throw on non-success code" but if you catch WebException you can at least use the response:
using System;
using System.IO;
using System.Web;
using System.Net;
public class Test
{
s...
What is the equivalent of the C++ Pair in Java?
...alue as a primitive or built-in class without encapsulating it in a class. If we were to return a tuple of a dozen elements no one would disagree it should have its own class. Somewhere in the middle is a (fuzzy) dividing line. I think our lizard brains can cope with Pairs easily enough.
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The written versions of the logical operators
.... When I wrote up a test program in NetBeans, I got the red underlining as if there was a syntax error and figured the website was wrong, but it is NetBeans which is wrong because it compiled and ran as expected.
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UnicodeDecodeError, invalid continuation byte
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In binary, 0xE9 looks like 1110 1001. If you read about UTF-8 on Wikipedia, you’ll see that such a byte must be followed by two of the form 10xx xxxx. So, for example:
>>> b'\xe9\x80\x80'.decode('utf-8')
u'\u9000'
But that’s just the mechanical ca...
Release generating .pdb files, why?
... debugging. Optimizations really do a number on your code, making it very difficult to find the culprit if something goes wrong (say, an exception is thrown). Even setting breakpoints is extremely difficult, because lines of source code cannot be matched up one-to-one with (or even in the same order...
Is it safe to check floating point values for equality to 0?
...equality between double or decimal type values normally, but I'm wondering if 0 is a special case.
9 Answers
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Proper way to catch exception from JSON.parse
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i post something into an iframe then read back the contents of the iframe with json parse...so sometimes it's not a json string
Try this:
if(response) {
try {
a = JSON.parse(response);
} catch(e) {
alert(e); // error in the...
MySQL load NULL values from CSV data
...field into a local variable, and then sets the actual field value to NULL, if the local variable ends up containing an empty string:
LOAD DATA INFILE '/tmp/testdata.txt'
INTO TABLE moo
FIELDS TERMINATED BY ","
LINES TERMINATED BY "\n"
(one, two, three, @vfour, five)
SET four = NULLIF(@vfour,'')
;
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