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How to check an Android device is HDPI screen or MDPI screen?
...rces().getDisplayMetrics().density;
// return 0.75 if it's LDPI
// return 1.0 if it's MDPI
// return 1.5 if it's HDPI
// return 2.0 if it's XHDPI
// return 3.0 if it's XXHDPI
// return 4.0 if it's XXXHDPI
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How to Set Focus on Input Field using JQuery
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138
Try this, to set the focus to the first input field:
$(this).parent().siblings('div.bottom')....
How to translate between Windows and IANA time zones?
...a/Toronto. TimeZoneConverter will deliver the one that CLDR marks with "001", known as the "golden zone", unless you specifically provide a country code and there's a match for a different zone in that country.
Note: This answer has evolved over the years, so comments below may or may not apply to ...
Access-Control-Allow-Origin wildcard subdomains, ports and protocols
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11 Answers
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Postgresql aggregate array
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163
Use array_agg: http://www.sqlfiddle.com/#!1/5099e/1
SELECT s.name, array_agg(g.Mark) as mark...
How can I unstage my files again after making a local commit?
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git reset --soft HEAD~1 should do what you want. After this, you'll have the first changes in the index (visible with git diff --cached), and your newest changes not staged. git status will then look like this:
# On branch master
# Changes to be ...
How are parameters sent in an HTTP POST request?
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1285
The values are sent in the request body, in the format that the content type specifies.
Usua...
How to add 10 days to current time in Rails
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Use
Time.now + 10.days
or even
10.days.from_now
Both definitely work. Are you sure you're in Rails and not just Ruby?
If you definitely are in Rails, where are you trying to run this from? Note that Active Support has to be loaded.
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How do I toggle an element's class in pure JavaScript?
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214
2014 answer: classList.toggle() is the standard and supported by most browsers.
Older browser...
Insert the carriage return character in vim
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1 Answer
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