
JavaScript powers the web - it's **the** most important programming language you need to know as a web developer.

For example, you should understand code like this:

```js
const basics = 'Okay, that should not be too difficult actually';

function printBasics() {
  console.log(basics):
}

printBasics();
```

Learn more about it [here](https://academind.com).


Mastering JavaScript


NextJS is a **framework for ReactJS**.

Wait a second ... a "framework" for React? Isn't React itself already a framework for JavaScript?

Well ... first of all, React is a "library" for JavaScript. That seems to be important for some people.

Not for me, but still, there is a valid point: React already is a framework / library for JavaScript. So it's already an extra layer on top of JS.

## Why would we then need NextJS?

Because NextJS makes building React apps easier - especially React apps that should have server-side rendering (though it does way more than just take care of that).

In this article, we'll dive into the core concepts and features NextJS has to offer:

- File-based Routing
- Built-in Page Pre-rendering
- Rich Data Fetching Capabilities
- Image Optimization
- Much More

## File-based Routing

![Create routes via your file + folder structure](nextjs-file-based-routing.png)

... More content ...


Getting Started with NextJS

**Setup Angular 2 Repo** :  
[https://github.com/angular/quickstart](https://github.com/angular/quickstart)

**In app.module.ts**

import FormsModule as we need to use two way data binding  
After making changes

```js
import { NgModule }      from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { FormsModule } from '@angular/forms';

import { AppComponent }  from './app.component';

@NgModule({
  imports:      [ BrowserModule, FormsModule ],
  declarations: [ AppComponent ],
  bootstrap:    [ AppComponent ]
})
export class AppModule { }
```

**In app.component.ts**

```js
import { Component } from '@angular/core';

@Component({
  selector: 'my-app',
  templateUrl: '/app/app.component.html',
})
export class AppComponent  {
  inputOne: number = 0;
  inputTwo: number = 0;
  result: number = 0;
  operations: any[] = [
    {id: '+', name: '+'},
    {id: '-', name: '-'},
    {id: '*', name: '*'},
    {id: '/', name: '/'}
  ];

  performOperation(operation) {
    if(!this.inputOne || !this.inputTwo) {
      alert('Please filled Input');
      return false;
    }
    if(operation == '+') {
      this.result = this.inputOne  + this.inputTwo;
    } else if (operation == '-') {
      this.result = this.inputOne  - this.inputTwo;
    } else if (operation == '*') {
      this.result = this.inputOne  * this.inputTwo;
    } else {
      this.result = this.inputOne  / this.inputTwo;
    }
  }
}
```

Create app.component.html file inside app folder

**In app.component.html**

```html
<div class="row">
  <div class="col-md-2 col-md-offset-5">
    <h1>Calculator</h1>
    <p><input type="number" [(ngModel)] = "inputOne"/></p>
    <p><input type="number" [(ngModel)] = "inputTwo"/></p>
    <p>
      <select #selectOperation>
        <option *ngFor="let operation of operations" [value]="operation.id">{{ operation.name}}</option>
      </select>
    </p>
    <button type="submit" class="btn btn-primary" (click) = "performOperation(selectOperation.value)">SUBMIT</button>
    <h3>Result : {{ result }}</h3>
  </div>
</div>
```
**In index.html**  
add this for using bootstrap

```html
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-1q8mTJOASx8j1Au+a5WDVnPi2lkFfwwEAa8hDDdjZlpLegxhjVME1fgjWPGmkzs7" crossorigin="anonymous">
```


Create Basic Calculator using Angular2


This is the code by which users can add customize right click context menu to web page.

**Adding CSS File**

```css
#contextMenuContainer {display: none; position: fixed; width:200px; z-index: 100;}
#contextMenuContainer #contextMenu {list-style: none; padding: 0px; font-size: 20px; border-radius: 10px; border: 1px solid #D3D3D3;}
#contextMenuContainer #contextMenu li {font-size: 20px; cursor: pointer; padding-top: 5px; padding-left: 20px; padding-right: 20px; padding-bottom: 5px; text-align: center;}
```

**Adding JS File**
```js
$(function() {
  var doubleClicked = false;
  $(document).on("contextmenu", function (e) {
   if(doubleClicked == false) {
    e.preventDefault(); // To prevent the default context menu.
    var windowHeight = $(window).height()/2;
    var windowWidth = $(window).width()/2;
    //When user click on bottom-left part of window
    if(e.clientY > windowHeight && e.clientX <= windowWidth) {
      $("#contextMenuContainer").css("left", e.clientX);
      $("#contextMenuContainer").css("bottom", $(window).height()-e.clientY);
      $("#contextMenuContainer").css("right", "auto");
      $("#contextMenuContainer").css("top", "auto");
    } else if(e.clientY > windowHeight && e.clientX > windowWidth) {
      //When user click on bottom-right part of window
      $("#contextMenuContainer").css("right", $(window).width()-e.clientX);
      $("#contextMenuContainer").css("bottom", $(window).height()-e.clientY);
      $("#contextMenuContainer").css("left", "auto");
      $("#contextMenuContainer").css("top", "auto");
    } else if(e.clientY <= windowHeight && e.clientX <= windowWidth) {
      //When user click on top-left part of window
      $("#contextMenuContainer").css("left", e.clientX);
      $("#contextMenuContainer").css("top", e.clientY);
      $("#contextMenuContainer").css("right", "auto");
      $("#contextMenuContainer").css("bottom", "auto");
    } else {
       //When user click on top-right part of window
      $("#contextMenuContainer").css("right", $(window).width()-e.clientX);
      $("#contextMenuContainer").css("top", e.clientY);
      $("#contextMenuContainer").css("left", "auto");
      $("#contextMenuContainer").css("bottom", "auto");
    }
    $("#contextMenuContainer").fadeIn(500, FocusContextOut());
      doubleClicked = true;
    } else {
      e.preventDefault();
      doubleClicked = false;
      $("#contextMenuContainer").fadeOut(500);
    }
  });
  function FocusContextOut() {
    $(document).on("click", function () {
      doubleClicked = false; 
      $("#contextMenuContainer").fadeOut(500);
      $(document).off("click");           
    });
  }
});
```

[Demo Link](http://jsfiddle.net/AkshayBandivadekar/bj367v4j/)


Adding a Right-click context menu to a webpage


**PHPmailer**
Probably the world's most popular code for sending email from PHP! 

```js
$mail->AddAttachment('path_for_pdf', $name = 'Name_of_pdf',  $encoding = 'base64', $type = 'application/pdf');
```


Add Attachment PHPmailer


**Adding CSS File**

```css
<link rel="stylesheet" href="{{URL::asset('assets/css/bootstrap.min.css')}}">
```

**Adding JS File**
```js
<script type="text/javascript" src="{{URL::asset('assets/js/angular/angular.min.js')}}"></script>
```


Adding external js and css file in Laravel 5.1


In most of online examination, developer uses concept of remove browser back button press behaviour, after implementing this user unable to press browser back button to go previous page.

This can be acheived using Jquery:

```js
window.location.hash="no-back-button";
window.location.hash="Again-No-back-button";//again because google chrome don't insert first hash into history
window.onhashchange=function(){
  window.location.hash="";
  history.replaceState('', document.title, window.location.pathname);
}

// remove fragment as much as it can go without adding an entry in browser history:
window.location.replace("#");

// slice off the remaining '#' in HTML5:    
if (typeof window.history.replaceState == 'function') {
  history.replaceState({}, '', window.location.href.slice(0, -1));
}
```


Remove back button press behaviour of browsers


**Validate password using following condition:**

- Password is atleast 8 characters long
- Password should contains atleast 1 uppercase, 1 lowercase and 1 special character letter

```js
$rules = array(
  'username' => 'required',
  'email' => 'required | between:5,100 | email ',
  'password' => 'required | confirmed |regex:/^(?=.*\d)(?=.*[a-z])(?=.*[A-Z])(?=.*[!@#$%^&*()+]+.*)[0-9a-zA-Z\w!@#$%^&*()+]{8,}$/'
);

$input = Input::all();

$validation = Validator::make($input, $rules);

if ($validation->fails()){
  //if validation fails redirect with inputs
  return redirect()->route('/')->withInput()
      ->withErrors($validation);
}

```


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