Javascript front-end UI framework Kit usage guide - kitjs dialog component_javascript skills

Kit is a UI library. I don’t intend for everyone to learn the core of my Kit and memorize my API. This kind of learning method of following the trend is meaningless at all. Today jQuery is hot and everyone is learning jQ. , SeaJs will become popular tomorrow, and everyone will speculate on SeaJs, so I have prepared a syntactic sugar (Suger.js) in KitJs specifically for jQ users, which completely simulates jQ’s API. In addition to the implementation, the interface is the same, which is convenient for everyone. Directly use the components of the kit to transform it. Of course, as a pure technical fan, it is far more interesting to have a deep understanding of how a technology is implemented than to use it as a doctrine ^_^. Of course, if you use the project bonus of your boss’s boss to plagiarize Kit’s component code out of KPI considerations or to complete your KPI, I don’t mind such behavior, as long as you drink water and don’t forget the well digger. , I would be very grateful to you if you can promote KitJs when you are having fun with your colleagues. At the same time, Kit is also a very young library. Due to continuous development, there are some bugs and browser compatibility issues. It is inevitable that I have limited energy. In this era of front-end wars, more like-minded people are welcome. Together with his gay friends, he will grow up and make progress together.

At the same time, a kitjs dialog component was released today. The demo address is http://xueduany.github.com/KitJs/KitJs/demo/Dialog/demo.html

(1) Kit directory format

Getting back to the subject, in KitJs, kit.js exists as the core Core file. It contains some of the most commonly used Dom and Object, inherited operations, and a batch of strings are expanded according to the functional division in the same level directory. js, math.js, etc. are all designed to achieve expansion of functions in specific directions. Each independent js file contains a Class constructor and an instance of the global object,

Taking kit.js as an example, it contains the $Kit class and the instance $kit of the $Kit class (starting with $ to avoid conflicts with commonly used variables),

Other types are hung on $Kit and $kit instances in the form of Links, such as math.js, which contains the $Kit.Math class and $kit.math instances, thus ensuring that the global scope There are only two pollutions, $Kit and $kit. At the same time, in kit.js, we have defined a namespace called $kit.ui. In the physical directory, there are Widget directories at the same level as kit.js, lined up with multiple directories with the first letter capitalized

All directories under the widget directory are kitjs component directories. Each independent js file only contains the class constructor (non-instance) of an independent component. It is also compatible with the module mode of commonJs (can comply with the Modules/1.1 specification of CommonJs , and AMD method transformation, the specific transformation method will be mentioned in detail later)

(2) Kit component default code template, comments comply with jsdoc specifications

Let’s take the dialog component as an example. Each component is similar to the following

The first is the jsdoc comment, @class declares what class it is, @require xxx.js, declares which components it depends on

(3) Constructor and initialization method

Each class defines a constructor in the standard function(config){} way. It should be noted here that the constructor of each kitjs component reserves a config parameter by default as the input for personalized configuration.

At the same time, in the constructor of the class, there is a static member, the defaultConfig object, which is used to store the default configuration of the kitjs component

When using kitjs components, you first need to initialize a new instance object through new Instance method new $kit.ui.Dialog.YesOrNo. This is just initializing a js component object, and there is no HTML. , you need to execute the init method, create HTML, and add it to the doc, which is equivalent to pouring flesh and blood on the soul^_^.

Some students may ask, why not put the init method directly in the constructor, but put it separately?

1 is because the parent class needs to be instantiated during inheritance. When a subclass inherits from the parent class, the prototype object of the subclass will be set to the new Instance of the parent class. If it is placed in the constructor The initialization method of init will cause the HTML of the parent class to be executed directly, generating garbage code,

2 is because considering lazy loading, the HTML code needs to be executed at the appropriate time, rather than immediately upon initialization

So the default way to use kitjs components is

After instantiation, execute the init method (the init method will return the current component object, with return code 7)

As can be seen from the above figure, all API methods in the dialog are hung on the prototype, and are inherited and passed to instance objects through prototype extension

Observe the constructor code of $kit.ui.Dialog.YesOrNo component,

(4) Inheritance of KitJs

He declares the inheritance relationship with the $kit.ui.Dialog object through the $kit.inherit method. Some students here will ask, why should we inherit in the constructor instead of writing it directly outside?

The reason is:

1.kitjs is a prototype-based maintenance of inheritance relationships

2. To use kitjs components, you must instantiate the component object. Each component is created through the constructor through new Instance

So I put the execution of the inheritance relationship in the constructor of the code, so that when a new component is instantiated, it will inherit the inheritance method of its parent class step by step along the constructor of the current component. members and methods.

When a subclass needs to modify the method of the parent class, it only needs to define a method with the same name in the prototype of the subclass to override the inherited method of the parent class.

In terms of naming, kitjs follows. The subclass continues the class name of the parent class as the Namespace, and continues the chain, as shown in the picture above $kit.ui.Dialog, $kit.ui.Dialog.YesOrNo

The inheritance implementation of kitjs is also very simple

Instantiate a parent class object, copy all members of the parent class instance to the prototype of the subclass, then reset the constructor of the prototype of the subclass to the subclass constructor, and then attach a link to the subclass constructor , pointing to the parent class, through the $kit.inherit method, during the instantiation process of the subclass $kit.ui.Dialog.YesOrNo, you can inherit all non-existing members of the subclass of the parent class $kit.ui.Dialog, and implement Inheritance similar to static languages

(5) config parameter , coupling disassembly/skinning of HTML and Css?

Kit's component constructor is used to passing in a Map type parameter to personalize the component. When the kit component is initialized, it will automatically overwrite the default defaultConfig with the config parameters submitted by the user and start initialization.

For any component, changes in HTML structure and CSS styles are inevitable

kit decomposes this coupling in the parameter configuration of config,

The first is to use HTML template technology. Kit advocates using the $kit.newHTML method to directly eradicate HTML String, generate HTML DOM and insert it into the document stream,

So we extract the approximate HTML content of the component, encapsulate it into an HTML String template, and store it in the defaultConfig of the component. If the user needs to modify the HTML template, he or she can use a custom config during initialization to overwrite the template in the default defaultConfig. field,

In the coupling decomposition of HTML templates and CSS, Kit uses a trick which is to decompose the className using js template

Replace the html in the config with ${xxx} corresponding to the xxx in the config through $kit.tpl in the init method

At the same time, all styles are set in css,

If there are multiple sets of skins that need to be switched, you can choose to modify the className of the template by specifying the actual className corresponding to ${cls} through config during initialization to achieve the effect of skin changing.

(6) Summary

Basically, through code analysis of the $kit.ui.Dialog.YesOrNo component, we have a general understanding of the component implementation structure of kitjs. In fact, it is not difficult to design a page component, but it is a difficult requirement to design one that can adapt to various requirements, can be quickly deformed in various situations, and adapt to development. Kit splits HTML templates and Css, and cooperates with custom config parameters and defaultConfig. Subclasses obtain the attributes and methods of the parent class through inheritance, and at the same time reconstruct relevant codes according to different business needs. Basically, kit can be flexible Meet the needs of business UI components at various levels and in various environments.

KitJs includes basic libraries and UI libraries,
Basic library: selector function, dom operation function, animation function, enhanced dom event, added hashtree data structure, io function, local storage function, multi-threading, range, etc.
There is also suger.js
that simulates jquery operation format The UI library includes: enhanced form elements, pop-up layers, media players, validation frameworks, waterfall flows, linkages, slideshows, calendars, upload components, template engines, etc.