Angular and legacy JavaScript integrations

Most systems that provide certain features that are commonly used, also provide some kind of integration. Let’s say that graphics and charts library, documented in old-plain legacy JavaScript (< ES5), with old styled HTML &<script> code, just to include a bar chart. Or some site that allows visitors buy event tickets, no API, no web components, just a block of code with a “insert this script on your code” which imports a Javascript file, a CSS file and embeds an iframe. You probably have seen this, and if you haven’t you’ll do sometime (trust me…)

This integrations, most of the times, are meant for non-developers, “include this code and it will work”, magic.

But, what if you have to make this integrations work with your Angular SPA?

#web-development #angular #legacy-code #javascript

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Basics of Angular: Part-1

What is Angular? What it does? How we implement it in a project? So, here are some basics of angular to let you learn more about angular.

Angular is a Typescript-based open-source front-end web application platform. The Angular Team at Google and a community of individuals and corporations lead it. Angular lets you extend HTML’s syntax to express your apps’ components clearly. The angular resolves challenges while developing a single page and cross-platform applications. So, here the meaning of the single-page applications in angular is that the index.html file serves the app. And, the index.html file links other files to it.

We build angular applications with basic concepts which are NgModules. It provides a compilation context for components. At the beginning of an angular project, the command-line interface provides a built-in component which is the root component. But, NgModule can add a number of additional components. These can be created through a template or loaded from a router. This is what a compilation context about.

What is a Component in Angular?

Components are key features in Angular. It controls a patch of the screen called a view. A couple of components that we create on our own helps to build a whole application. In the end, the root component or the app component holds our entire application. The component has its business logic that it does to support the view inside the class. The class interacts with the view through an API of properties and methods. All the components added by us in the application are not linked to the index.html. But, they link to the app.component.html through the selectors. A component can be a component and not only a typescript class by adding a decorator @Component. Then, for further access, a class can import it. The decorator contains some metadata like selector, template, and style. Here’s an example of how a component decorator looks like:

@Component({
    selector: 'app-root',
    templateUrl: 'app.component.html',
    styleUrls: ['app.component.scss']
})

Role of App Module

Modules are the package of functionalities of our app. It gives Angular the information about which features does my app has and what feature it uses. It is an empty Typescript class, but we transform it by adding a decorator @NgModule. So, we have four properties that we set up on the object pass to @NgModule. The four properties are declarations, imports, providers, and bootstrap. All the built-in new components add up to the declarations array in @NgModule.

@NgModule({
declarations: [
  AppComponent,
],
imports: [
  BrowserModule,
  HttpClientModule,
  AppRoutingModule,
  FormsModule
],
bootstrap: [AppComponent]
})

What is Data Binding?

Data Binding is the communication between the Typescript code of the component and the template. So, we have different kinds of data binding given below:

• When there is a requirement to output data from our Typescript code in the HTML template. String interpolation handles this purpose like {{data}} in HTML file. Property Binding is also used for this purpose like [property] = “data”.
• When we want to trigger any event like clicking a button. Event Binding works while we react to user events like (event) = “expression”.
• When we can react to user events and output something at the same time. Two-way Binding is used like [(ngModel)] = “data”.

#angular #javascript #tech blogs #user interface (ui) #angular #angular fundamentals #angular tutorial #basics of angular

Install Angular - Angular Environment Setup Process

Angular is a TypeScript based framework that works in synchronization with HTML, CSS, and JavaScript. To work with angular, domain knowledge of these 3 is required.

1. Installing Node.js and npm
2. Installing Angular CLI
3. Creating workspace
4. Deploying your First App

In this article, you will get to know about the Angular Environment setup process. After reading this article, you will be able to install, setup, create, and launch your own application in Angular. So let’s start!!!

Install Angular in Easy Steps

For Installing Angular on your Machine, there are 2 prerequisites:

• Node.js
• npm Package Manager

Node.js

First you need to have Node.js installed as Angular require current, active LTS or maintenance LTS version of Node.js

Download and Install Node.js version suitable for your machine’s operating system.

Npm Package Manager

Angular, Angular CLI and Angular applications are dependent on npm packages. By installing Node.js, you have automatically installed the npm Package manager which will be the base for installing angular in your system. To check the presence of npm client and Angular version check of npm client, run this command:

1. npm -v

Installing Angular CLI

• Open Terminal/Command Prompt
• To install Angular CLI, run the below command:

1. npm install -g @angular/cli

· After executing the command, Angular CLI will get installed within some time. You can check it using the following command

1. ng --version

Workspace Creation

Now as your Angular CLI is installed, you need to create a workspace to work upon your application. Methods for it are:

• Using CLI
• Using Visual Studio Code

1. Using CLI

To create a workspace:

• Navigate to the desired directory where you want to create your workspace using cd command in the Terminal/Command prompt
• Then in the directory write this command on your terminal and provide the name of the app which you want to create. In my case I have mentioned DataFlair:

1. Ng new YourAppName

• After running this command, it will prompt you to select from various options about the CSS and other functionalities.

• To leave everything to default, simply press the Enter or the Return key.

#angular tutorials #angular cli install #angular environment setup #angular version check #download angular #install angular #install angular cli

Angular and legacy JavaScript integrations

Most systems that provide certain features that are commonly used, also provide some kind of integration. Let’s say that graphics and charts library, documented in old-plain legacy JavaScript (< ES5), with old styled HTML &<script> code, just to include a bar chart. Or some site that allows visitors buy event tickets, no API, no web components, just a block of code with a “insert this script on your code” which imports a Javascript file, a CSS file and embeds an iframe. You probably have seen this, and if you haven’t you’ll do sometime (trust me…)

This integrations, most of the times, are meant for non-developers, “include this code and it will work”, magic.

But, what if you have to make this integrations work with your Angular SPA?

#web-development #angular #legacy-code #javascript

How to Install Angular in Ubuntu Step by Step

In this article, we will learn how to install angular in ubuntu step by step.  We can install Angular CLI in many ways. we will use NPM (Node Package Manager) on Ubuntu.

1: Install Node.js

In this step, we will install node.js using the below command.

sudo apt update

sudo apt install nodejs

The nodejs package contains both the node and npm.

Now, we will check the node and npm version

sudo node --version

sudo npm --version

2: Install Angular/CLI

After installation of node.js and npm on your system, use the following commands to install the Angular CLI tool on your system.

npm install -g @angular/cli

The latest version of Angular CLI will be installed on your Ubuntu Linux system. You may require an older Angular version on your machine. To install a specific Angular version run the command as follows with a version number.

npm install -g @angular/cli@11        #Angular 11
npm install -g @angular/cli@12        #Angular 12

Angular CLI provides a command ng used for command-line operations. Let’s check the installed version of ng on your system.

sudo ng --version

3: Create New Angular Application

Now, we will create an angular application using CLI.

ng new angular-project

4: Serve Angular Application

Now, we’ll start our project using the following commands.

cd angular-project
ng serve --open

Now, open the browser on http://localhost:4200/ to check the running project.

You can change the host and port for running the Angular applications by providing --host and --port command-line arguments.

ng serve --host 0.0.0.0 --port 8080

#angular #javascript 

What is JavaScript - Stackfindover - Blog

Who invented JavaScript, how it works, as we have given information about Programming language in our previous article ( What is PHP ), but today we will talk about what is JavaScript, why JavaScript is used The Answers to all such questions and much other information about JavaScript, you are going to get here today. Hope this information will work for you.

Who invented JavaScript?

JavaScript language was invented by Brendan Eich in 1995. JavaScript is inspired by Java Programming Language. The first name of JavaScript was Mocha which was named by Marc Andreessen, Marc Andreessen is the founder of Netscape and in the same year Mocha was renamed LiveScript, and later in December 1995, it was renamed JavaScript which is still in trend.

What is JavaScript?

JavaScript is a client-side scripting language used with HTML (Hypertext Markup Language). JavaScript is an Interpreted / Oriented language called JS in programming language JavaScript code can be run on any normal web browser. To run the code of JavaScript, we have to enable JavaScript of Web Browser. But some web browsers already have JavaScript enabled.

Today almost all websites are using it as web technology, mind is that there is maximum scope in JavaScript in the coming time, so if you want to become a programmer, then you can be very beneficial to learn JavaScript.

JavaScript Hello World Program

In JavaScript, ‘document.write‘ is used to represent a string on a browser.

<script type="text/javascript">
	document.write("Hello World!");
</script>

How to comment JavaScript code?

• For single line comment in JavaScript we have to use // (double slashes)
• For multiple line comments we have to use / * – – * /

<script type="text/javascript">

//single line comment

/* document.write("Hello"); */

</script>

Advantages and Disadvantages of JavaScript

#javascript #javascript code #javascript hello world #what is javascript #who invented javascript