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Change an HTML5 input's placeholder color with CSS
...ns: pseudo-elements, pseudo-classes, and nothing.
WebKit, Blink (Safari, Google Chrome, Opera 15+) and Microsoft Edge are using a pseudo-element: ::-webkit-input-placeholder. [Ref]
Mozilla Firefox 4 to 18 is using a pseudo-class: :-moz-placeholder (one colon). [Ref]
Mozilla Firefox 19+ is using a ...
Determine what attributes were changed in Rails after_save callback?
...
To anyone seeing this later on, as it currently (Aug. 2017) tops google: It is worth mentioning, that this behavior will be altered in Rails 5.2, and has deprecation warnings as of Rails 5.1, as ActiveModel::Dirty changed a bit.
What do I change?
If you're using attribute_changed? method...
How to detect when an Android app goes to the background and come back to the foreground
...fecycleOwner, see @vokilam's answer
The actual solution according to a Google I/O talk:
class YourApplication : Application() {
override fun onCreate() {
super.onCreate()
registerActivityLifecycleCallbacks(AppLifecycleTracker())
}
}
class AppLifecycleTracker : Application.Activi...
Best way to create unique token in Rails?
... I use this to obfuscate IP addresses when sending the "client id" to Google Analytics' measurement protocol. It's supposed to be a UUID, but I just take the first 32 chars of the hexdigest for any given IP.
– thekingoftruth
Jan 16 '15 at 19:22
...
How do I import a Swift file from another Swift file?
...arget). So for me, and others that will arrive here by following the first google result for "swift unresolved identifier class", this is an answer (and not a comment).
– noamtm
Jun 1 '15 at 10:15
...
How to check if a string contains text from an array of substrings in JavaScript?
...
For people Googling,
The solid answer should be.
const substrings = ['connect', 'ready'];
const str = 'disconnect';
if (substrings.some(v => str === v)) {
// Will only return when the `str` is included in the `substrings`
}
...
Python error “ImportError: No module named”
.... You edited init.py on windows 2. It added a TAB instead spaces 3. You google a lot until finding this post! ;)
– GBrian
Mar 1 '16 at 8:21
...
What does “|=” mean? (pipe equal operator)
I tried searching using Google Search and Stack Overflow, but it didn't show up any results. I have seen this in opensource library code:
...
Understanding the meaning of the term and the concept - RAII (Resource Acquisition is Initialization
...ays. Using the tag syntax ("[topic]") is very helpful, and many people use google...
– dmckee --- ex-moderator kitten
Apr 3 '09 at 18:19
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How to identify if a webpage is being loaded inside an iframe or directly into the browser window?
...e code is run inside an iframe or the top-level window.
On the other hand Google Chrome seems to execute my content script only once within the top-level window, so the above wouldn't work at all.
What finally worked for me in a content script in both browsers is this:
console.log(window.frames....