category chooser

Ecshop supports customizing keywords, Description meta information for each new class, so it doesn't have to help SEO or let the browser know what the page is, but if there are hundreds of classes, it's a bit tiring to write these classes manually (we don't do manual labor. Live), took a bit of time, wrote a PHP script to automatically generate keywords, description, support four-level classification, the principle is that the sub-category contains th

1: You can add a new method to a class, but you cannot add an instance variable.2: First, you cannot add a new instance variable to the class. The category has no location to accommodate the instance variable.Second, the name conflict, that is, the method in the category is the same as the existing method. When a name conflict occurs, the category has a higher pr

WebApi Controller category, webapicontrollerPreface Write this WebApi Controller classification one is to talk about the solution of the Contrller classification, and then talk about the problems and solutions encountered by the way. To be honest, it was very difficult to use WebApi in the project for the first time. Problems and Solutions 1. Multiple Get methods. The Get request method is the most commonly used, and multiple requests need to be reloa

Category in objective-c Category in oc is similar to extension in swift. It is often used to extend some methods for Int, NSString, NSArray, and other basic data type objects.There are two main purposes: Basic Type Extension and function forward definition.Basic Type Extension In the following example, you can add the reverse method to NSString.Create an NSString + ReverseString extension class. In. h // NS

Limitations of the Category(1) A new instance variable cannot be added to the class, and the class has no location to hold the instance variable.(2) name conflict, where the category has a higher precedence when the methods in the category conflict with the original class method name. The class method will completely replace the initial method so that the initial

Objective-C 2.0 adds class extensions to solve two problems: allowing an object to have a private interface that can be verified by the compiler. Supports a public read-only, private writable attribute. Before Private Interface Objective-C 2.0, to define a Private function, a "Private" category: @ interface MyClass (Private) is usually declared in the implementation file) -(id) awesomePrivateMethod; @ end however, the private method of the class is us

In Objective-c, you can add attributes to an existing class by category, but you cannot add an instance variable Anyway read the first time I was a little dizzy, you can add "properties", and then say "add instance variable", the first feeling seems a bit contradictory. So let's talk about: What is an instance variable? An instance variable is a variable that can hold data. On OC, the form is as follows:@interface myviewcontroller:u

In objective-C 2.0, class extensions is added to solve two problems: An object can have a private interface and can be verified by the compiler. Supports a public read-only, private writable attribute. Private Interface) Before objective-C 2.0, to define a private function, you usually declare "private" category in the implementation file: @ Interface myclass (private)-(ID) awesomeprivatemethod;@ End However, the private method of the class is usua

Laravel5.1 sorting is actually very simple, that is, it is OK to update the IDs and values to be sorted one by one. Template page (index. blade. php) {!! Form: open (array ('URL' => 'admin/category/sort/', 'method' => 'put '))!!} @ Foreach ($ categories as $ category) {{-- some fields are omitted here --}}sort}}">id}}">@ Endforeach Sort{!! Form: close ()!!} Controller: Public function sort (Request

Recently, I used the Access database to create a micro-application. I needed to implement the effect similar to the compute by syntax in SQL Server. I Googled it online and learned that jet does not support it, so I had to use it myself. net. Currently, only one field can be used to sum another field, that is, sum (fielda) Compute by (filedb ). Note that fielda must be of the decimal type. If it is of the double type, you may need to modify it.Source code. Code highlighting produced by Actip

Highcharts build the Group category coordinate axis and highcharts coordinate axisHighchartsThe Group category coordinate axis further groups the category tags of the coordinate axes to form a dual-layer and multi-layer structure. This is more conducive to the presentation of data groups. To implement the Group category