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Can I set an opacity only to the background image of a div?
...ght: 0;
background: url(test.jpg) center center;
opacity: .4;
width: 100%;
height: 100%;
}
See test case on jsFiddle
:before and ::before pseudo-element
Another trick is to use the CSS 2.1 :before or CSS 3 ::before pseudo-elements. :before pseudo-element is supported in IE from v...
Find element's index in pandas Series
...I admit that there should be a better way to do that, but this at least avoids iterating and looping through the object and moves it to the C level.
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What is the difference between jQuery: text() and html() ?
...t;/b>');
});
</script>
</head>
<body>
<div id="div1"></div>
<div id="div2"></div>
</body>
</html>
A difference that may not be so obvious is described in the jQuery API documentation
In the documentation for .html():
The .html(...
Android - border for button
...ow code
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<gradient android:startColor="#FFFFFF"
android:endColor="#00FF00"
android:angle="270" />
<corners android:radius="3dp" />...
Do sealed classes really offer performance Benefits?
...
The JITter will sometimes use non-virtual calls to methods in sealed classes since there is no way they can be extended further.
There are complex rules regarding calling type, virtual/nonvirtual, and I don't know them all so I can't really outline them for you, but...
In git, what is the difference between merge --squash and rebase?
... commit) for a tree. Maybe the mercurial term for this is more clear: they call it transplant because it's just that: picking a new ground (parent commit, root) for a tree.
When doing an interactive rebase, you're given the option to either squash, pick, edit or skip the commits you are going to re...
How do I disable the security certificate check in Python requests
...
Thanks, this works if you have few requests calls inside your own code, but imagine that I want to disable this in a third partly library that uses requests,... it would be impossible to fix the 3rd party lib like this.
– sorin
De...
Custom views with Storyboard
...(View Controllers) I used to separate the whole thing in smaller pieces (I call them widgets). These widgets consist basically of a MyWidget.h and a MyWidget.m file as well as a MyWidget.xib file, where the root element is a UIView and the MyWidget class is the File Owner of the UIView. In t...
Create a tar.xz in one command
...fc)
- outputs to Standard Output
| pipes output to the next command
xz -4e calls xz with the -4e compression option. (equal to -4 --extreme)
> baz.tar.xz directs the tarred and compressed file to baz.tar.xz
where -4e is, use your own compression options.
I often use -k to --keep the original ...
Can I call a constructor from another constructor (do constructor chaining) in C++?
...
C++11: Yes!
C++11 and onwards has this same feature (called delegating constructors).
The syntax is slightly different from C#:
class Foo {
public:
Foo(char x, int y) {}
Foo(int y) : Foo('a', y) {}
};
C++03: No
Unfortunately, there's no way to do this in C++03, but t...