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How to access component methods from “outside” in ReactJS?
...the component instance. You can pass a ref callback in when rendering the root of the component to get the instance, like so:
// React code (jsx)
function MyWidget(el, refCb) {
ReactDOM.render(<MyComponent ref={refCb} />, el);
}
export default MyWidget;
and:
// vanilla javascript code...
Can scrapy be used to scrape dynamic content from websites that are using AJAX?
...er". If you put the mentioned code inside a file called handlers.py on the root of the "scraper" folder, then you could add to your settings.py:
DOWNLOAD_HANDLERS = {
'http': 'scraper.handlers.PhantomJSDownloadHandler',
'https': 'scraper.handlers.PhantomJSDownloadHandler',
}
And voilà, t...
What does “./” (dot slash) refer to in terms of an HTML file path location?
...is the the folder that the working file is in:
So in /index.htm ./ is the root directory
but in /css/style.css ./ is the css folder.
This is important to remember because if you move CSS from /index.htm to /css/style.css the path will change.
...
How to add a “open git-bash here…” context menu to the windows explorer?
...Default Git-Bash Location C:\Program Files\Git\git-bash.exe
[HKEY_CLASSES_ROOT\*\shell\Open Git Bash]
@="Open Git Bash"
"Icon"="C:\\Program Files\\Git\\git-bash.exe"
[HKEY_CLASSES_ROOT\*\shell\Open Git Bash\command]
@="\"C:\\Program Files\\Git\\git-bash.exe\" \"--cd=%1\""
; This will make it appe...
Should developers have administrator permissions on their PC
...ges to do.
Bearing in mind that development staff do not necessarily have root access to production systems, admin rights on a local PC does not significantly compromise security of production systems. There is almost no legitimate operational reason for restricting admin access to local PCs for s...
How to make inline functions in C#
...scoping and don't worry about performance.
"Premature optimization is the root of all evil (or at least most of it) in programming."
-- Donald Knuth
"A program that doesn't run correctly doesn't need to run fast"
-- Me
sh...
How to add 30 minutes to a JavaScript Date object?
...t may be overkill/impossible for your project. The syntax is modeled after MySQL DATE_ADD function.
/**
* Adds time to a date. Modelled after MySQL DATE_ADD function.
* Example: dateAdd(new Date(), 'minute', 30) //returns 30 minutes from now.
* https://stackoverflow.com/a/1214753/18511
*
* @...
What's the difference between NOT EXISTS vs. NOT IN vs. LEFT JOIN WHERE IS NULL?
...LEFT JOIN / IS NULL: Oracle
NOT IN vs. NOT EXISTS vs. LEFT JOIN / IS NULL: MySQL
In a nutshell:
NOT IN is a little bit different: it never matches if there is but a single NULL in the list.
In MySQL, NOT EXISTS is a little bit less efficient
In SQL Server, LEFT JOIN / IS NULL is less efficient
...
AngularJS access parent scope from child controller
...other controllers, you can install a "hook" to the global scope:
function RootCtrl($scope) {
$scope.root = $scope;
}
Then in any child controller, you can access the "global" scope with $scope.root. Anything you set here will be globally visible.
Example:
function RootCtrl($scope) {
...
Is there a unique Android device ID?
...on factory reset". Use at your own risk, and it can be easily changed on a rooted phone.
– Seva Alekseyev
Jun 23 '10 at 14:21
32
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