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How to take screenshot of a div with JavaScript?
...ntents.
When the quiz is finished, do this:
var c = document.getElementById('the_canvas_element_id');
var t = c.getContext('2d');
/* then use the canvas 2D drawing functions to add text, etc. for the result */
When the user clicks "Capture", do this:
window.open('', document.getElementById('the...
Practical uses for AtomicInteger
... 1 operations, this is detected rather than overwriting the old update (avoiding the "lost update" problem). This is actually a special case of compareAndSet - if the old value was 2, the class actually calls compareAndSet(2, 3) - so if another thread has modified the value in the meantime, the inc...
PowerShell: Setting an environment variable for a single command only
...$pre} else {Remove-Item env:\foo}... some might say unwieldy, but will avoid side effects...
– Lucas
Jun 21 '17 at 21:32
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Exclude all transitive dependencies of a single dependency
...he app module yet). I found this to work:
<dependency>
<groupId>${project.groupId}</groupId>
<artifactId>app</artifactId>
<version>${project.version}</version>
<exclusions>
<exclusion>
<groupId>*</gro...
Best practices when running Node.js with port 80 (Ubuntu / Linode) [closed]
...s not only applies to Linode, but Digital Ocean, AWS EC2 and other VPS providers as well. However, on RedHat based systems /etc/rc.local is /ect/rc.d/local.
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When to use symbols instead of strings in Ruby?
...;DR
A simple rule of thumb is to use symbols every time you need internal identifiers. For Ruby < 2.2 only use symbols when they aren't generated dynamically, to avoid memory leaks.
Full answer
The only reason not to use them for identifiers that are generated dynamically is because of memory ...
What do commas and spaces in multiple classes mean in CSS?
...
.container_12 .grid_6,
.container_16 .grid_8 {
width: 460px;
}
That says "make all .grid_6's within .container_12's and all .grid_8's within .container_16's 460 pixels wide." So both of the following will render the same:
<div class...
Convert JSON string to dict using Python
... edited Jul 24 '18 at 8:28
David Leon
89177 silver badges2121 bronze badges
answered Dec 24 '10 at 19:51
Ign...
How do I change Bootstrap 3 column order on mobile layout?
...layout with a top fixed navbar. Underneath I have two columns, one for a sidebar (3), and one for content (9). Which on desktop looks like this
...
App Inventor 2 UrsPahoMqttClient 拓展 - 物联网轻量级MQTT协议 · App Inventor 2 中文网
...值为TCP、SSL和TLS，其他值将被忽略。
身份标识
ClientID - 客户端ID
可选：唯一客户端标识。如果未指定任何值，则内部会分配一个随机值 (GUID)。同时连接到同一消息服务器的所有客户端，客户端ID必须是唯一的。
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