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jQuery: checking if the value of a field is null (empty)
Is this a good way to check if the value of a field is null ?
7 Answers
7
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Is JavaScript a pass-by-reference or pass-by-value language?
...itive types (number, string, etc.) are passed by value, but objects are unknown, because they can be both passed-by-value (in case we consider that a variable holding an object is in fact a reference to the object) and passed-by-reference (when we consider that the variable to the object holds the o...
What is 'YTowOnt9'?
...do too, but when they are empty they are all the same. It makes it look as if a lot of very different PHP scripts have this random string in common.
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Resize HTML5 canvas to fit window
...is 125% is often related to Device Pixel Resolution adjustment. Basically, if you are on a high pixel density device, the font will appear smaller than it should... so it will scale up to make the font be normal sized. As far as I understand it. You can check the display using: window.devicePixelRat...
Should URL be case sensitive?
...There may be URLs, or parts of URLs, where case doesn't matter, but
identifying these may not be easy. Users should always consider that
URLs are case-sensitive.
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Using current time in UTC as default value in PostgreSQL
...orary table test(
id int,
ts timestamp without time zone default (now() at time zone 'utc')
);
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How to capitalize the first letter in a String in Ruby
...sn't do what you want it to, it outputs мария instead of Мария.
If you're using Rails there's an easy workaround:
"мария".mb_chars.capitalize.to_s # requires ActiveSupport::Multibyte
Otherwise, you'll have to install the unicode gem and use it like this:
require 'unicode'
Unicod...
PHP exec() vs system() vs passthru()
What are the differences?
5 Answers
5
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FloatActionBtn 扩展：悬浮操作按钮扩展，可自定义颜色、大小、图标和位置 ...
...鼠标移动时拖动元素 document.onmousemove = function(e) { if (!isDragging) return; element.style.left = (e.clientX - offsetX) + 'px'; element.style.top = (e.clientY - offsetY) + 'px'; }; // 鼠标释放时停止拖动 document.onmouseup = function(...
How to get the current time in Python
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Use:
>>> import datetime
>>> datetime.datetime.now()
datetime.datetime(2009, 1, 6, 15, 8, 24, 78915)
>>> print(datetime.datetime.now())
2009-01-06 15:08:24.789150
And just the time:
>>> datetime.datetime.now().time()
datetime.time(15, 8, 24, 78915)
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