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What do helper and helper_method do?
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#application_controller.rb
def current_user
@current_user ||= User.find_by_id!(session[:user_id])
end
helper_method :current_user
the helper method on the other hand, is for importing an entire helper to the views provided by the controller (and it's inherited controllers). What this means is d...
How do you create a toggle button?
...two different statuses of the button. Example with an up/down effect given by borders:
$(document).ready(function() {
$('a#button').click(function() {
$(this).toggleClass("down");
});
});
a {
background: #ccc;
cursor: pointer;
border-top: solid 2px #eaeaea;
border-left:...
LINQ Group By into a Dictionary Object
... List<CustomObject>> myDictionary = ListOfCustomObjects
.GroupBy(o => o.PropertyName)
.ToDictionary(g => g.Key, g => g.ToList());
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What are these attributes: `aria-labelledby` and `aria-hidden`
... attributes are called as ARIA attribute states and model
aria-labelledby: Identifies the element (or elements) that labels the current element.
aria-hidden (state): Indicates that the element and all of its descendants are not visible or perceivable to any user as implemented
by the aut...
How to paginate with Mongoose in Node.js?
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I'm am very disappointed by the accepted answers in this question. This will not scale. If you read the fine print on cursor.skip( ):
The cursor.skip() method is often expensive because it requires the server to walk from the beginning of the col...
Wildcards in jQuery selectors
I'm trying to use a wildcard to get the id of all the elements whose id begin with "jander". I tried $('#jander*') , $('#jander%') but it doesn't work..
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ASP.NET MVC Html.ValidationSummary(true) does not display model errors
...king as designed" and not a bug - the overload of ValidationSummary() used by default excludes ModelState errors associated with the properties of the model itself. This leaves those errors to be represented by Html.ValidationMessageFor() calls for each individual property without having them duplic...
UIButton Long Press Event
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You can start off by creating and attaching the UILongPressGestureRecognizer instance to the button.
UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPress:)];
[self.butt...
Linux下部署企业级邮件服务器(postfix + dovecot + extmail) - 开源 & Gith...
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mysql> GRANT all privileges on extmail.* TO extmail@localhost IDENTIFIED BY 'extmail';
Query OK, 0 rows affected (0.00 sec)
mysql> GRANT all privileges on extmail.* TO extmail@127.0.0.1 IDENTIFIED BY 'extmail';
Query OK, 0 rows affected (0.00 sec)
3、安装配置apache
yum install httpd ...
How to pass event as argument to an inline event handler in JavaScript?
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You don't need to pass this, there already is the event object passed by default automatically, which contains event.target which has the object it's coming from. You can lighten your syntax:
This:
<p onclick="doSomething()">
Will work with this:
function doSomething(){
console.l...