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Javascript event handler with parameters
... of closure preserve access to the variables for you.
From your comments, if what you're trying to accomplish is this:
element.addEventListener('click', func(event, this.elements[i]))
Then, you could do this with a self executing function (IIFE) that captures the arguments you want in a closure ...
Return Boolean Value on SQL Select Statement
...
What you have there will return no row at all if the user doesn't exist. Here's what you need:
SELECT CASE WHEN EXISTS (
SELECT *
FROM [User]
WHERE UserID = 20070022
)
THEN CAST(1 AS BIT)
ELSE CAST(0 AS BIT) END
...
Invalid URI: The format of the URI could not be determined
...
It may help to use a different constructor for Uri.
If you have the server name
string server = "http://www.myserver.com";
and have a relative Uri path to append to it, e.g.
string relativePath = "sites/files/images/picture.png"
When creat...
instanceof Vs getClass( )
...
The reason that the performance of instanceof and getClass() == ... is different is that they are doing different things.
instanceof tests whether the object reference on the left-hand side (LHS) is an instance of the type on the right-hand side (RHS) or some subtype.
getClass() == ... tests wh...
What is a stream?
...skip bytes from the stream (this is like read, but you ignore the data. Or if you prefer it's like seek but can only go forwards.)
push back bytes into an input stream (this is like "undo" for read - you shove a few bytes back up the stream, so that next time you read that's what you'll see. It's oc...
onSaveInstanceState () and onRestoreInstanceState ()
...restore the values in onCreate():
public void onCreate(Bundle icicle) {
if (icicle != null){
value = icicle.getLong("param");
}
}
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foll...
Change type of varchar field to integer: “cannot be cast automatically to type integer”
...ting integer or assign a varchar field to an integer one), so you must specify an explicit cast using ALTER TABLE ... ALTER COLUMN ... TYPE ... USING:
ALTER TABLE the_table ALTER COLUMN col_name TYPE integer USING (col_name::integer);
Note that you may have whitespace in your text fields; in that...
What is the difference between packaged_task and async
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Actually the example you just gave shows the differences if you use a rather long function, such as
//! sleeps for one second and returns 1
auto sleep = [](){
std::this_thread::sleep_for(std::chrono::seconds(1));
return 1;
};
Packaged task
A packaged_task won...
How to determine when a Git branch was created?
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Use
git show --summary `git merge-base foo master`
If you’d rather see it in context using gitk, then use
gitk --all --select-commit=`git merge-base foo master`
(where foo is the name of the branch you are looking for.)
...
How can I repeat a character in Bash?
...
If you functionalise this it's best to rearrange it from $s%.0s to %.0s$s otherwise dashes cause a printf error.
– KomodoDave
Jul 30 '14 at 7:35
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