Introduction to the basics of AngularJS-JS Tutorial-php.cn

Home

Web Front-end

JS Tutorial

Introduction to the basics of AngularJS

零到壹度

Apr 21, 2018 am 10:37 AM

angularjs

The content of this article is about the basic introduction to angularjs. It has a certain reference value. Now I share it with you. Friends in need can refer to it.

Key points:

Front-end JS framework: It encapsulates the use of JS to develop front-end repetitive functions, extends HTML, and is mainly used for page operation and display.

Core: MVC, modularization, two-way data binding, dependency injection, semantic tags, expressions, etc. [Recommended related video tutorials: angularjs video tutorial]

Two-way data binding

Introducing related js files

<!DOCTYPE html>
<html>
    <head>
       <meta charset="UTF-8">
       <title></title>
       <!--引入Angularjs-->
       <script type="text/javascript" src="../js/angular.min.js" ></script>
    </head>
    <body>
       <!--匿名应用模块-->
       <p ng-app="">
           <input ng-model="username" name="username"/>
           <input ng-model="username"/>
           <p>{{username}}</p>
           <p ng-bind="username"></p>
       </p>
    </body>
</html>

##ng-app=””Anonymous application module, generally write a name to facilitate subsequent initialization

ng-model: Automatically bind the value of the

form element to the Angularjs internal variable.

ng-bind: The function is equivalent to expression, but the usage is different. Generally used to bind non-form elements and display variables.

The difference between ng-bind and {{}}: the former will replace all the contents of the tag's sub-tags with the contents of the variable, while the latter just displays the contents of the variable at the current position.

Based on modularized MVC (MVVM)

View: mainly refers to HTML static page data tags, mainly used for display.

Model: Mainly only fills in some data of the view and logical processing. For example, json, variable

control: some js code, write logic. Mainly to get the model, populate the view, get data from the view, and populate the model.

Conversion between m and vm:

For example, variables:

var username=”XiaoQi”;
$scope.username=username;

The variables of vm are actually bound to the properties in the global variable $scope.

On the page: {{username}}

Note: $scope cannot be added to Angularjs variables on the page.

If the variable is changed by internal js such as timer, then by default Angularjs cannot implement two-way data binding display, and $.digest needs to be used to force notification (refresh)

Example of initializing content when the page is opened:

<!DOCTYPE html>
<html>
    <head>
       <meta charset="UTF-8">
       <title></title>
       <!--引入Angularjs-->
       <script type="text/javascript" src="../js/angular.min.js" ></script>
    </head>
    <body>
       <!--<p ng-app="myApp" ng-controller="myCtrl"  ng-init="username=&#39;Jack&#39;">-->
       
       <p ng-app="myApp" ng-controller="myCtrl">
           
           <input ng-model="username"/>
           <p>{{username}}</p>
       </p>
       
       <!--控制器-->
       <script type="text/javascript">
           //初始化应用模块
           //参数1：应用模块的名字
           //参数2：使用扩展模块，这里没有
           var myApp=angular.module("myApp",[]);
           //初始化控制器：认为控制器绑定了一堆js
           //参数1：控制器的名字
           //参数2：js函数
           myApp.controller("myCtrl",["$scope",function ($scope) {
              //初始化变量
              $scope.username="XiaoQi";
              //可以写任何的js
           }]);
           
       </script>
    </body>
</html>

##Note:

If you define named application modules and controllers, you must use js initialize it!

Dependency Injection DI

##Button Event Binding

<!DOCTYPE html>
<html>
    <head>
       <meta charset="UTF-8">
       <title></title>
       <!--引入Angularjs-->
       <script type="text/javascript" src="../js/angular.min.js" ></script>
    </head>
    <body>
       <!--视图-->
       <p ng-app="myApp" ng-controller="myCtrl">
           <input ng-model="username"/>
           <input type="button" value="清空数据1" ng-click="clearMsg()"/>
           <input type="button" value="清空数据2" ng-click="username=&#39;&#39;"/>
           <p>Hello {{username}}</p>
       </p>
       <!--控制器-->
       <script type="text/javascript">
           //初始化应用模块
           var myApp=angular.module("myApp",[]);
           //初始化控制器
           myApp.controller("myCtrl",["$scope",function($scope){
              //初始化一个angularjs的事件
              $scope.clearMsg=function(){
                  //清空数据
                  $scope.username="";
              };
           }]);
       </script>
    </body>
</html>

## Repeat traversal

<!DOCTYPE html>
<html>
    <head>
       <meta charset="UTF-8">
       <title></title>
       <!--引入Angularjs-->
       <script type="text/javascript" src="../js/angular.min.js" ></script>
    </head>
    <body>
       <!--视图-->
       <p ng-app="myApp" ng-controller="myCtrl">
           <table border="1">
              <tr>
                  <th>序号</th>
                  <th>商品编号</th>
                  <th>商品名称</th>
                  <th>商品价格</th>
              </tr>
              <tr ng-repeat="product in  products">
                  <td>{{$index+1}}</td>
                  <td>{{product.id}}</td>
                  <td>{{product.name}}</td>
                  <td>{{product.price}}</td>
              </tr>
           </table>
       </p>
       <!--控制器-->
       <script type="text/javascript">
           angular.module("myApp",[])
           .controller("myCtrl",["$scope",function($scope){
              //json数组
              $scope.products=[
                  {"id":1001,"name":"电视机","price":998},
                  {"id":1002,"name":"洗衣机","price":988898}
              ];
           }])
        </script>
    </body>
</html>

product: Just write it, the temporary angularjs object during each traversal, here refers to each json object.

Routing mechanism

Before: include contains pages, which only reuse pages, but the reused pages are also refreshed as a whole.

Through angularjs routing, partial refresh can be achieved, and repeated head and tail can be realized without refreshing. And multi-view single page effect.

Underlying implementation: realized through # (anchor) in html.

Official example:

Writing: url # Sub-path (to be displayed in the middle)
Introduce the routing module:

<!--引入路由模块-->
       <script type="text/javascript"  src="../js/angular-route.min.js"  ></script>

<!DOCTYPE html>
<html>
    <head>
       <meta charset="UTF-8">
       <title></title>
       <!--引入Angularjs-->
       <script type="text/javascript" src="../js/angular.min.js" ></script>
       <!--引入路由模块-->
       <script type="text/javascript" src="../js/angular-route.min.js" ></script>
    </head>
    <body>
       <p ng-app="myApp">
           <p>===========我是头<br />
              <a href="#/">首页</a>
              <a href="#/computer">电脑分类</a>
              <a href="#/money">财务管理</a>
           </p>
           <!--路由中的包含的页面的显示，只能有一个元素-->
           <p ng-view></p>
           
           <p>==========我是脚</p>
           
       </p>
    
    
       <!--控制器-->
       <script type="text/javascript">
           angular.module("myApp",[&#39;ngRoute&#39;])
           //angularjs的配置，在配置中配置路由内容
           .config([&#39;$routeProvider&#39;, function($routeProvider){
                $routeProvider
                //template中支持html标签
                   .when(&#39;/&#39;,{template:&#39;这是<h1 id="首页页面">首页页面</h1>&#39;})
                   //.when(&#39;/computer&#39;,{template:&#39;这是电脑分类页面&#39;})
                   .when(&#39;/computer&#39;,{templateUrl:&#39;computer.html&#39;})
                   .when(&#39;/money&#39;,{template:&#39;这是财务页面&#39;})
                   //如果都匹配不上，则跳转到一个页面
                   .otherwise({redirectTo:&#39;/&#39;});
           }]);
       </script>
    </body>
</html>

ng-view: used to display the content of routing resultswhen: the result of judgment statement

template:html, supports html tags

templateUrl: Support loading additional pages

Related recommendations:

Download all versions of AngularJS

AngularJS learning summary

The difference between angularjs and angular4. Why use angular4

angular introductory tutorial

The above is the detailed content of Introduction to the basics of AngularJS. For more information, please follow other related articles on the PHP Chinese website!

Statement

The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Understanding the JavaScript Engine: Implementation DetailsApr 17, 2025 am 12:05 AM

Understanding how JavaScript engine works internally is important to developers because it helps write more efficient code and understand performance bottlenecks and optimization strategies. 1) The engine's workflow includes three stages: parsing, compiling and execution; 2) During the execution process, the engine will perform dynamic optimization, such as inline cache and hidden classes; 3) Best practices include avoiding global variables, optimizing loops, using const and lets, and avoiding excessive use of closures.

Python vs. JavaScript: The Learning Curve and Ease of UseApr 16, 2025 am 12:12 AM

Python is more suitable for beginners, with a smooth learning curve and concise syntax; JavaScript is suitable for front-end development, with a steep learning curve and flexible syntax. 1. Python syntax is intuitive and suitable for data science and back-end development. 2. JavaScript is flexible and widely used in front-end and server-side programming.

Python vs. JavaScript: Community, Libraries, and ResourcesApr 15, 2025 am 12:16 AM

Python and JavaScript have their own advantages and disadvantages in terms of community, libraries and resources. 1) The Python community is friendly and suitable for beginners, but the front-end development resources are not as rich as JavaScript. 2) Python is powerful in data science and machine learning libraries, while JavaScript is better in front-end development libraries and frameworks. 3) Both have rich learning resources, but Python is suitable for starting with official documents, while JavaScript is better with MDNWebDocs. The choice should be based on project needs and personal interests.

From C/C to JavaScript: How It All WorksApr 14, 2025 am 12:05 AM

The shift from C/C to JavaScript requires adapting to dynamic typing, garbage collection and asynchronous programming. 1) C/C is a statically typed language that requires manual memory management, while JavaScript is dynamically typed and garbage collection is automatically processed. 2) C/C needs to be compiled into machine code, while JavaScript is an interpreted language. 3) JavaScript introduces concepts such as closures, prototype chains and Promise, which enhances flexibility and asynchronous programming capabilities.

JavaScript Engines: Comparing ImplementationsApr 13, 2025 am 12:05 AM

Different JavaScript engines have different effects when parsing and executing JavaScript code, because the implementation principles and optimization strategies of each engine differ. 1. Lexical analysis: convert source code into lexical unit. 2. Grammar analysis: Generate an abstract syntax tree. 3. Optimization and compilation: Generate machine code through the JIT compiler. 4. Execute: Run the machine code. V8 engine optimizes through instant compilation and hidden class, SpiderMonkey uses a type inference system, resulting in different performance performance on the same code.

Beyond the Browser: JavaScript in the Real WorldApr 12, 2025 am 12:06 AM

JavaScript's applications in the real world include server-side programming, mobile application development and Internet of Things control: 1. Server-side programming is realized through Node.js, suitable for high concurrent request processing. 2. Mobile application development is carried out through ReactNative and supports cross-platform deployment. 3. Used for IoT device control through Johnny-Five library, suitable for hardware interaction.

Building a Multi-Tenant SaaS Application with Next.js (Backend Integration)Apr 11, 2025 am 08:23 AM

I built a functional multi-tenant SaaS application (an EdTech app) with your everyday tech tool and you can do the same. First, what’s a multi-tenant SaaS application? Multi-tenant SaaS applications let you serve multiple customers from a sing

How to Build a Multi-Tenant SaaS Application with Next.js (Frontend Integration)Apr 11, 2025 am 08:22 AM

This article demonstrates frontend integration with a backend secured by Permit, building a functional EdTech SaaS application using Next.js. The frontend fetches user permissions to control UI visibility and ensures API requests adhere to role-base

See all articles

Hot AI Tools

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress images for free

Clothoff.io

AI clothes remover

AI Hentai Generator

Generate AI Hentai for free.

Hot Article

R.E.P.O. Energy Crystals Explained and What They Do (Yellow Crystal)

1 months agoBy尊渡假赌尊渡假赌尊渡假赌

R.E.P.O. Best Graphic Settings

1 months agoBy尊渡假赌尊渡假赌尊渡假赌

Assassin's Creed Shadows: Seashell Riddle Solution

2 weeks agoByDDD

R.E.P.O. How to Fix Audio if You Can't Hear Anyone

1 months agoBy尊渡假赌尊渡假赌尊渡假赌

R.E.P.O. Chat Commands and How to Use Them

1 months agoBy尊渡假赌尊渡假赌尊渡假赌

Hot Tools

SublimeText3 English version

Recommended: Win version, supports code prompts!

SecLists

SecLists is the ultimate security tester's companion. It is a collection of various types of lists that are frequently used during security assessments, all in one place. SecLists helps make security testing more efficient and productive by conveniently providing all the lists a security tester might need. List types include usernames, passwords, URLs, fuzzing payloads, sensitive data patterns, web shells, and more. The tester can simply pull this repository onto a new test machine and he will have access to every type of list he needs.