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Is there a way that I can check if a data attribute exists?
...is interesting, but it should be noted that if you have the attribute data-foo-bar then your check needs to be .data().hasOwnProperty("fooBar"), not .data().hasOwnProperty("foo-bar")
– dgmstuart
Sep 26 '15 at 1:03
...
ruby system command check exit code
...d execution fails.
system("unknown command") #=> nil
system("echo foo") #=> true
system("echo foo | grep bar") #=> false
Furthermore
An error status is available in $?.
system("VBoxManage createvm --invalid-option")
$? #=> #<Process::Status: pid 9...
How to get the URL without any parameters in JavaScript?
...
This is possible, but you'll have to build it manually from the location object:
location.protocol + '//' + location.host + location.pathname
share
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improve this answer
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What to do with “Unexpected indent” in python?
...e one before is not the start of a subblock (e.g. if/while/for statement). All lines of code in a block must start with exactly the same string of whitespace. For instance:
>>> def a():
... print "foo"
... print "bar"
IndentationError: unexpected indent
This one is especially commo...
disable textbox using jquery?
... value = $(this).val();
if(value == 'x'){
enableInput('foo'); //with class foo
enableInput('bar'); //with class bar
}else{
disableInput('foo'); //with class foo
disableInput('bar'); //with class bar
}
});
});
...
When is a function too long? [closed]
...
There's no real hard and fast rules for it. Generally I like my methods to just "do one thing". So if it's grabbing data, then doing something with that data, then writing it to disk then I'd split out the grabbing and writing into separate methods so my "main" method just ...
What are the best practices to follow when declaring an array in Javascript?
...n array with just one pre-specified number element in it!
Using [] is actually more efficient, and safer too! It's possible to overwrite the Array constructor and make it do odd things, but you can't overwrite the behaviour of [].
Personally, I always use the [] syntax, and similarly always use {...
How can I get the ID of an element using jQuery?
...'#test').prop('id')
which is different from .attr() and $('#test').prop('foo') grabs the specified DOM foo property, while $('#test').attr('foo') grabs the specified HTML foo attribute and you can find more details about differences here.
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Isn't “package private” member access synonymous with the default (no-modifier) access?
...package. As a concrete example :
package ab;
class A {
protected void foo() {}
void dd(){}
}
class C {
void aa(){
A a = new A();
a.foo(); //legal
a.dd(); //legal
}
}
package sub;
class D extends A{
void ac(){
foo(); //legal ..
dd(); //...
How to add custom validation to an AngularJS form?
... }
};
}]);
You can use it like this:
<input ng-model="foo" invalid-if="{fooIsGreaterThanBar: 'foo > bar',
fooEqualsSomeFuncResult: 'foo == someFuncResult()'}/>
Or by just passing in an expression (it will be given the default validation...