AngularJS Basic Learning Notes Instructions_AngularJS
AngularJS extends HTML attributes through directives.
AngularJS Directives
AngularJS directives are extended HTML attributes with the ng- prefix.
The ng-app directive is used to initialize the AngularJS application.
The ng-init directive is used to initialize application data.
The ng-model directive is used to bind the values of HTML controls (such as input, select, textarea, etc.) to application data.
<div ng-app="" ng-init="firstName='John'">
<p>Name: <input type="text" ng-model="firstName"></p>
<p>You wrote: {{ firstName }}</p>
</div>
The ng-app directive also tells AngularJS that the
Data Binding
In the above example, {{ firstName }} is an AngularJS data binding expression.
In AngularJS data binding, AngularJS expressions use AngularJS data to update synchronously.
{{ firstName }} updates data synchronously through ng-model="firstName".
<div ng-app="" ng-init="quantity=1;price=5">
Quantity: <input type="number" ng-model="quantity">
Costs: <input type="number" ng-model="price">
Total in dollar: {{ quantity * price }}
</div>
Note Using the ng-init directive is very common in AngularJS development. In the Controllers section you'll see better ways to initialize data.
Repeat HTML element
The ng-repeat directive is used to repeatedly create an HTML element:
<div ng-app="" ng-init="names=['Jani','Hege','Kai']">
<ul>
<li ng-repeat="x in names">
{{ x }}
</li>
</ul>
</div>
Use the ng-repeat directive on an array of objects:
<div ng-app="" ng-init="names=[
{name:'Jani',country:'Norway'},
{name:'Hege',country:'Sweden'},
{name:'Kai',country:'Denmark'}]">
<ul>
<li ng-repeat="x in names">
{{ x.name + ', ' + x.country }}
</li>
</ul>
</div>
Note AngularJS is very suitable for database CRUD (i.e. create, read, update and delete) operations. Imagine if these objects came from a database?
ng-app directive
The ng-app directive defines the root element of the AngularJS application.
When the Web page is loaded, the ng-app instruction will auto-bootstrap (automatically initialize) the application. That is, automatically initialize and guide the execution of AngularJS application.
In the following chapters you will learn how to assign a value to the ng-app directive (for example, ng-app="myModule") to associate it with the module.
ng-init directive
The ng-init directive is used to initialize values for AngularJS application.
Generally, there is no need to use the ng-init instruction. Instead, use a controller or module to perform initialization work.
You will learn about controllers and modules in the following chapters.
ng-model directive
The ng-model directive is used to bind the values of HTML controls (such as input, select, textarea, etc.) to application data.
The ng-model directive can also be used:
Provide data verification (such as verification number, email address, required fields).
Provide the status of the data (such as invalid, dirty, touched, error).
Provides CSS style classes for HTML elements.
Bind HTML elements to HTML forms.
ng-repeat directive
The ng-repeat directive is used to generate a corresponding HTML element for each element in the data collection (or array).
The above is the entire content of this article, I hope you all like it.
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
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
How to get items using commands in Terraria? -How to collect items in Terraria?
Mar 19, 2024 am 08:13 AM
How to get items using commands in Terraria? 1. What is the command to give items in Terraria? In the Terraria game, giving command to items is a very practical function. Through this command, players can directly obtain the items they need without having to fight monsters or teleport to a certain location. This can greatly save time, improve the efficiency of the game, and allow players to focus more on exploring and building the world. Overall, this feature makes the gaming experience smoother and more enjoyable. 2. How to use Terraria to give item commands 1. Open the game and enter the game interface. 2. Press the "Enter" key on the keyboard to open the chat window. 3. Enter the command format in the chat window: "/give[player name][item ID][item quantity]".
VUE3 quick start: using Vue.js instructions to switch tabs
Jun 15, 2023 pm 11:45 PM
This article aims to help beginners quickly get started with Vue.js3 and achieve a simple tab switching effect. Vue.js is a popular JavaScript framework that can be used to build reusable components, easily manage the state of your application, and handle user interface interactions. Vue.js3 is the latest version of the framework. Compared with previous versions, it has undergone major changes, but the basic principles have not changed. In this article, we will use Vue.js instructions to implement the tab switching effect, with the purpose of making readers familiar with Vue.js
The latest 5 angularjs tutorials in 2022, from entry to mastery
Jun 15, 2017 pm 05:50 PM
Javascript is a very unique language. It is unique in terms of the organization of the code, the programming paradigm of the code, and the object-oriented theory. The issue of whether Javascript is an object-oriented language that has been debated for a long time has obviously been There is an answer. However, even though Javascript has been dominant for twenty years, if you want to understand popular frameworks such as jQuery, Angularjs, and even React, just watch the "Black Horse Cloud Classroom JavaScript Advanced Framework Design Video Tutorial".
Explore the infinite possibilities of the input method that comes with MC commands (an innovative tool to create a perfect gaming experience - the input method that comes with MC commands)
May 02, 2024 pm 03:01 PM
Mobile devices have become an essential part of people's lives in modern society. Games have also become one of the main forms of entertainment in people's spare time. There are constantly people working on developing new tools and technologies to optimize gameplay and improve the gaming experience. The input method with its own MC command is one of the eye-catching innovations. And how it can bring a better gaming experience to players. This article will delve into the infinite possibilities of the built-in MC command input method. Introduction to the built-in MC command input method. The built-in MC command input method is an innovative tool that combines the functions of MC commands and intelligent input methods. This enables more operations and functions. By installing the input method on a mobile device, players can easily use various commands in the game. Enter commands quickly to improve game efficiency
Use PHP and AngularJS to build a responsive website to provide a high-quality user experience
Jun 27, 2023 pm 07:37 PM
In today's information age, websites have become an important tool for people to obtain information and communicate. A responsive website can adapt to various devices and provide users with a high-quality experience, which has become a hot spot in modern website development. This article will introduce how to use PHP and AngularJS to build a responsive website to provide a high-quality user experience. Introduction to PHP PHP is an open source server-side programming language ideal for web development. PHP has many advantages, such as easy to learn, cross-platform, rich tool library, development efficiency
An instruction is a command that controls the execution of a computer. It consists of what and an address code.
Jan 11, 2021 am 11:43 AM
Instructions are commands that control computer execution, and they consist of operation codes and address codes. Usually an instruction includes two aspects: operation code and operand (address code). The operation code determines the operation to be completed, and the operand refers to the data participating in the operation and the address of the unit where it is located.
What are the instructions to prevent bubbling events?
Nov 21, 2023 pm 04:14 PM
Instructions to prevent bubbling events include stopPropagation(), cancelBubble attribute, event.stopPropagation(), event.cancelBubble attribute, event.stopImmediatePropagation(), etc. Detailed introduction: 1. stopPropagation() is one of the most commonly used instructions, used to stop the propagation of events. When an event is triggered, calling this method can prevent the event from continuing, etc.
What are the two parts of instructions that a computer can directly execute?
Dec 09, 2020 am 09:15 AM
The instructions that the computer can directly execute include operation codes and operands. The opcode refers to the part of the instruction or field specified in the computer program to perform the operation. It is actually the instruction sequence number, which is used to tell the CPU which instruction needs to be executed.
