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Check if an element contains a class in JavaScript?
...List .contains method:
element.classList.contains(class);
This works on all current browsers and there are polyfills to support older browsers too.
Alternatively, if you work with older browsers and don't want to use polyfills to fix them, using indexOf is correct, but you have to tweak it a ...
Any reason not to start using the HTML 5 doctype? [closed]
...
Well consider this:
When serving as text/html, all you need a doctype for is to trigger standards mode. Beyond that, the doctype does nothing as far as browsers are concerned.
When serving as text/html, whether you use XHTML markup or HTML markup, it's treated by browser...
How do you find the disk size of a Postgres / PostgreSQL table and its indexes
... and index size in terms of bytes/MB/GB/etc , or even better the size for all tables. In Oracle I had a nasty long query that looked at user_lobs and user_segments to give back an answer.
...
How do I write stderr to a file while using “tee” with a pipe?
... need to keep an exra FD and do cleanup afterward by killing it and technically should be doing that in a trap '...' EXIT.
There is a better way to do this, and you've already discovered it: tee.
Only, instead of just using it for your stdout, have a tee for stdout and one for stderr. How will yo...
How to get and set the current web page scroll position?
... This answer is not accurate as the scrollTop property doesn't work on all browsers. Check window.pageXOffset and window.pageYOffset for better results.
– gyo
Nov 26 '15 at 10:57
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How to specify an array of objects as a parameter or return value in JSDoc?
...cific what you mean by JSDoc - this is a generic term covering pretty much all the JavaDoc-style documentation tools for JavaScript.
The syntax you used for array of strings looks like the one supported by Google Closure Compiler.
Using this, an array of Objects would be:
/**
* @param {Array.<Ob...
How to match, but not capture, part of a regex?
...avaScript, yay! would be nice to have a JS friendly method, but not bad at all, +0.5 (rounding up ;D )
– GiantCowFilms
Mar 27 '15 at 2:37
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Want to find records with no associated records in Rails
...).where( :friends => { :person_id => nil } )
For the hmt it's basically the same thing, you rely on the fact that a person with no friends will also have no contacts:
Person.includes(:contacts).where( :contacts => { :person_id => nil } )
Update
Got a question about has_one in the c...
How to customize the background color of a UITableViewCell?
I would like to customize the background (and maybe the border too) of all of the UITableViewCells within my UITableView. So far I have not been able to customize this stuff, so I have a bunch of white background cells which is the default.
...
Make an existing Git branch track a remote branch?
... 1.7.0 (before 1.8.0):
git branch --set-upstream foo upstream/foo
Notes:
All of the above commands will cause local branch foo to track remote branch foo from remote upstream.
The old (1.7.x) syntax is deprecated in favor of the new (1.8+) syntax. The new syntax is intended to be more intuitive a...