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Android - Back button in the title bar
...actually click on the application icon, an onOptionsItemSelected method is called. So to go back to the previous activity, add that method to your activity and put Intent code in it that will return you to the previous activity. For example, let's say the activity you are trying to go back to is ca...
How to add facebook share button on my website?
..., and Android by performing a full redirect to a URL.
You can trigger this call:
FB.ui({
method: 'share',
href: 'https://developers.facebook.com/docs/', // Link to share
}, function(response){});
You can also include open graph meta tags on the page at this URL to customise the story that is sh...
What are queues in jQuery?
...hey are First-In-First-Out (FIFO). You can add a function to the queue by calling .queue(), and you remove (by calling) the functions using .dequeue().
To understand the internal jQuery queue functions, reading the source and looking at examples helps me out tremendously. One of the best examples...
@ variables in Ruby on Rails
.....}. After this though, methods within the class access and make function calls with that variable as if it were local (i.e. "options.merge()"). Is this just bad form? Is there some other syntactic magic going in? (i.e. like making silent dup of variable, or making it 'const' so that it can't ...
When exactly are onSaveInstanceState() and onRestoreInstanceState() called?
...oid onRestoreInstanceState (Bundle savedInstanceState)
This method is called between onStart() and onPostCreate(Bundle).
void onSaveInstanceState (Bundle outState)
If called, this method will occur after onStop() for applications targeting platforms starting with Build.VERSION_CODES.P...
What's Mongoose error Cast to ObjectId failed for value XXX at path “_id”?
...bjectId.
One way to resolve this is to add a check prior to your findById call to see if id is a valid ObjectId or not like so:
if (id.match(/^[0-9a-fA-F]{24}$/)) {
// Yes, it's a valid ObjectId, proceed with `findById` call.
}
...
How to create a MySQL hierarchical recursive query
...y happen if the id passes the first condition. The length function is only called to make sure this condition is always true, even if the pv string would for some reason yield a falsy value.
All in all, one may find these assumptions too risky to rely on. The documentation warns:
you might ge...
How to find if div with specific id exists in jQuery?
...function gets the text of the clicked element and assigns it to a variable called name . That variable is then used as the <div> id of the appended element.
...
使用App Inventor扩展实现多点触控：Rotation Detector · App Inventor 2 中文网
...ect two-finger rotation gestures performed on a Canvas. The demo app here, called rotationSprite, is a simple demonstration of detecting rotation gestures. You can download the apk file of the demo app from here. The demo app simply illustrates how to use the RotationDetector component to rotate a...
How to simulate a button click using code?
...event using code in Android? I want to trigger the button click programmatically when some other event occurs.
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