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CSS: center element within a element
... text-align:center;
background-color:blue;
height:400px;
width:600px;
}
.block {
height:100px;
width:200px;
text-align:left;
}
.center {
margin:auto;
background-color:green;
}
.left {
margin:auto auto auto 0;
background-color:red;
}
.right ...
Email Address Validation in Android on EditText [duplicate]
How can we perform Email Validation on edittext in android ? I have gone through google & SO but I didn't find out a simple way to validate it.
...
2 column div layout: right column with fixed width, left fluid
...olumn needs to come before the left one.
If the right has a float (and a width), and if the left column doesn't have a width and no float, it will be flexible :)
Also apply an overflow: hidden and some height (can be auto) to the outer div, so that it surrounds both inner divs.
Finally, at the le...
Passing parameters to JavaScript files
...ript type="text/javascript">
MYLIBRARY.init(["somevalue", 1, "controlId"]);
MYLIBRARY.helloWorld();
</script>
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Django Reverse with arguments '()' and keyword arguments '{}' not found
...
You have to specify project_id:
reverse('edit_project', kwargs={'project_id':4})
Doc here
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foll...
记一次数据库表自增长（Auto Increment）故障 - 数据库(内核) - 清泛网 - ...
...一个测试表说明问题：
CREATE TABLE IF NOT EXISTS `test` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`name` varchar(100) NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB;
然后插入一行问题数据：
INSERT INTO test (id, name) VALUES (2147483647, 'x');
结果导致不能执...
What's the difference between using “let” and “var”?
...ing them before the initialization results in a ReferenceError. Variable said to be in "temporal dead zone" from the start of the block until the initialization is processed.
function checkHoisting() {
console.log(foo); // ReferenceError
let foo = "Foo";
console.log(foo); // Foo
}
checkHoist...
Regex replace uppercase with lowercase letters
...e, you can just use ?: in the inner groups (i.e. non capture groups) or avoid creating them at all:
Find: ((?:[a-z][A-Z]+)|(?:[A-Z]+[a-z])) OR ([a-z][A-Z]+|[A-Z]+[a-z])
Replace: \L$1
2016-06-23 Edit
Tyler suggested by editing this answer an alternate find expression for #4:
(\B)([A-Z]+)
Acc...
Run a callback only if an attribute has changed in Rails
...eRecord::Base
before_save :do_something, if: :will_save_change_to_status_id?
private
def do_something
# ...
end
end
The commit that changed ActiveRecord::Dirty is here: https://github.com/rails/rails/commit/16ae3db5a5c6a08383b974ae6c96faac5b4a3c81
Here is a blog post on these change...
Using CSS to affect div style inside iframe
Is it possible to change styles of a div that resides inside an iframe on the page using CSS only?
13 Answers
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