Three major modules of angularjs study notes (modal, controller, view)

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Three major modules of angularjs study notes (modal, controller, view)_AngularJS

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May 16, 2016 pm 03:38 PM

angularjs

Today I will mainly explain to you the three major modules of angularjs in detail: modal, controller, and view.

First, let me tell you about the relationship between these three modules.

1. The data model (modal) mainly provides data. It does not interact directly with views.

2. The controller saves the data provided by the modal and operates with the view.

3.view is the view, which is the page display.

4. In short, the controller is responsible for the communication between data and views, and is the interface between the two. Their division of labor is clear and modularization is achieved.

1. How to use data model (modal)?

Speaking of data models, let’s take a look at the example from the previous tutorial:

<!DOCTYPE html>
 <html ng-app="app"> 
   <head>
   <meta charset="UTF-8">
   <title>Document</title>
     <script src="angular-1.2.19/angular.js"></script> <!-- 引入了AngularJS包 -->
     <script src="controll.js"></script> //引入控制器
   </head>
   <body>
     <div ng-controller="controller"> 
       <input type="text" ng-model="text">
       <b>{{greeting.text}} {{text}}</b>
     </div>
   </body>
 </html>

1. First introduce the angularjs package. When starting it, first look for the ng-app directive, which specifies the entire scope;

2. Then you will continue to look for specific instructions. Here you will find ng-model, which defines a "text" data model.

3. The text model is used below, so two-way binding is achieved. (As long as it is within the scope of ng-app, text can be used directly)

2. How to use the controller?

First, let’s talk about some key points of using the controller:

1. Don’t reuse controllers for views. A controller is generally only responsible for a small set of views (one-to-one correspondence);

2. Do not directly operate the DOM in the controller. This is not the responsibility of the controller. To operate the DOM, use the directive command (see the previous tutorial);

3. Do not perform data filtering operations in the controller. There is a dedicated filter service to implement this;

4. Generally speaking, different controllers do not call each other, and the interaction between controllers is generally carried out through events.

Then let’s look at the blue part of the code above. The content of control.js is:

 function controller($scope){
   $scope.greeting = {
     text : 'hello'
   };
 }

Angularjs finds an ng-controller instruction, and then it will find the place where this instruction is defined, which is the control.js file, and then you can use greeting.text to get its value directly.

3. How to use views?

When talking about how to use views, directives must be mentioned. (This is new knowledge!!!)

Let’s look at a piece of code:

var appModule = angular.module('app', []); //app是html中ng-app指令的名称

appModule.directive('hello', function() { //定义一个指令，名称叫hello
  return {
    restrict: 'E',
    template: '<div>Hi there</div>',
    replace: true
  };
});

The above code defines a command tag. You can try directly in html and see what happens! ! !

Then I will explain the meaning of each attribute:

1.restrict: (string) optional parameter, indicating in what form the instruction is declared in the DOM. The values are: E (element), A (attribute), C (class), M (comment); the above example is set to element form ();

2.template: (string or function) optional parameters, returned content, the above example returns a div;

3.templateUrl: Same as above, return content through url. If a lot of content is returned, it is recommended to use this attribute.

4.relace: (Boolean value), the default value is false. The above example is set to true: the page will be replaced by the returned div after using the hello tag.

5.transclude: (Boolean value), when set to true. This configuration option allows us to extract the content contained in the element of the directive and place it at a specific location in the directive template, used with ng-transclude.

6. There are also some other attributes. Let’s learn more about them later. . .

OK, the above are the instructions for using these three main modules. I hope it will be helpful to everyone's study. . . If there is anything you don’t understand about the above notes, just ask me and I will definitely answer it for you. I wish you all a happy life!

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