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Connecting overloaded signals and slots in Qt 5
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The error message is:
error: no matching function for call to QObject::connect(QSpinBox*&, <unresolved overloaded function type>, QSlider*&, void (QAbstractSlider::*)(int))
The important part of this is the me...
quick random row selection in Postgres
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This has an off by one error. It will never return the first row and will generate an error 1/COUNT(*) because it will try to return the row after the last row.
– Ian
Mar 21 '14 at 20:24
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jQuery Validation plugin: disable validation for specified submit buttons
...re not roundtripping to the server and seeing a server generated page with errors. You'll need to bypass validation on the server side by some other means - this just allows the form to be submitted client side without errors (the alternative would be adding .ignore attributes to everything in your ...
HTTP POST using JSON in Java
...tly in the string, you might program the string wrongly and causing syntax error. By using JSONObject you make sure that your serialization is always follow the right JSON structure
– momo
Aug 24 '11 at 20:47
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What is the proper way to check for null values?
...rogram. I'd rather use a safe cast because I think it's likely to surface errors faster. It also avoids calling ToString() on a string object.
– tvanfosson
Mar 20 '12 at 19:17
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Convert JavaScript String to be all lower case?
...ying toLowerCase or toLocaleLowerCase on null would yield null (and not an error condition).
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Fastest way to find second (third…) highest/lowest value in vector or column
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I used this method, but get the following error: Error in sort.int(x, na.last = na.last, decreasing = decreasing, ...) : index 4705 outside bounds Any idea what might the issue be? Some details: My x is a numeric vector of length 4706 with some NAs in the data. I...
Create an empty object in JavaScript with {} or new Object()?
...t be a good practice to get into.
One other thing: you might have subtle errors if you forget to use the new operator. So, using literals will help you avoid that problem.
Ultimately, it will depend on the situation as well as preference.
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Does MySQL index foreign key columns automatically?
... as being a "redundant index". I tried to drop it but I got the following error: "ERROR 1553 (HY000): Cannot drop index 'index_name': needed in a foreign key constraint". So, it's not possible to drop that index and keep the foreign key.
– Ciprian Stoica
Oct ...
What represents a double in sql server?
... With some quick and dodgy mental arithmetic... the rounding/approximation errors would be the about the length of this fill stop -> "."
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