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JavaScript listener, “keypress” doesn't detect backspace?
...* keyCode: 8
* keyIdentifier: "U+0008"
*/
if(e.keyCode === 8 && document.activeElement !== 'text') {
e.preventDefault();
alert('Prevent page from going back');
}
});
share
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How to collapse all methods in Xcode?
... arrow
Unfold All ⌥ U option + U
Fold Methods & Functions ⌥ ⌘ ↑ option + command + up arrow
Unfold Methods & Functions ⌥ ⌘ ↓ option + command + down arrow
Fold Comment Blocks ⌃ ⇧ ⌘ ↑ control + shift + command + up...
What does the comma operator , do?
...bscure and more readable if you did something like: while (read_string(s) && s.len() > 5). Obviously that wouldn't work if read_string doesn't have a return value (or doesn't have a meaningful one). (Edit: Sorry, didn't notice how old this post was.)
– jamesdlin
...
Is there a performance difference between i++ and ++i in C++?
... the operator++ functions. Here's a standard pair of these functions:
Foo& Foo::operator++() // called for ++i
{
this->data += 1;
return *this;
}
Foo Foo::operator++(int ignored_dummy_value) // called for i++
{
Foo tmp(*this); // variable "tmp" cannot be optimized away by ...
How do I convert a hexadecimal color to rgba with the Less compiler?
...
This hasn't been updated for a while but with Less PHP I am getting the following error - @colorGold: color('#C6AF87'); .box { background-color: rgba(red(@colorGold),green(@colorGold),blue(@colorGold),0.3); } Error is - Could not compile CSS file (screen.less): co...
Substitute multiple whitespace with single whitespace in Python [duplicate]
...
A simple possibility (if you'd rather avoid REs) is
' '.join(mystring.split())
The split and join perform the task you're explicitly asking about -- plus, they also do the extra one that you don't talk about but is seen in your example, removing...
Cross field validation with Hibernate Validator (JSR 303)
...notations. This allows the error message to be specified per match.
For example, validating a common form:
@FieldMatch.List({
@FieldMatch(first = "password", second = "confirmPassword", message = "The password fields must match"),
@FieldMatch(first = "email", second = "confirmEma...
Rails: Custom text for rails form_for label
...e method declaration, you can see that second parameter is text. In this example, it's not very straight forward. But that documentation site is usually pretty good.
– gylaz
Oct 22 '12 at 0:47
...
How to exit an if clause
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When PHP introduced goto I turned to Python php.net/manual/en/control-structures.goto.php
– Marc
Jul 26 '15 at 18:36
...
Android: Rotate image in imageview by an angle
...port android.widget.ImageView;
Code: (Assuming imageView, angle, pivotX & pivotY are already defined)
Matrix matrix = new Matrix();
imageView.setScaleType(ImageView.ScaleType.MATRIX); //required
matrix.postRotate((float) angle, pivotX, pivotY);
imageView.setImageMatrix(matrix);
This metho...