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              <!--
  Inspired by @Dimosthenis dribbble shot, check this out >
  https://dribbble.com/shots/3449822-Notifiy-Animation 
-->
            
          
!
            
              // ---- CONSTS

$primaryColor: #57bafc
$animationDuration: 1s
$inputWidth: 500px
$inputHeight: $inputWidth / 3
$buttonWidth: $inputWidth / 1.5
$buttonHeight: $inputWidth / 3.5

// ---- GLOBAL

html, body, main
  height: 100%
  background: $primaryColor

*
  box-sizing: border-box

// ---- FORM

input, button 
  font-family: 'Nunito', sans-serif

main, form
  display: flex
  align-items: center
  justify-content: center

  input
    width: $inputWidth
    height: $inputWidth / 3
    background: #fff
    border: none
    border-radius: $inputWidth / 3.75
    color: $primaryColor
    font-size: $inputWidth / 12
    text-transform: uppercase
    font-weight: 600
    padding: 10px ($inputWidth / 5)
    outline: none
    cursor: pointer
    transition: all 250ms
    position: relative
    
    &[readonly] 
      cursor: not-allowed
      
    &:invalid
      box-shadow: none

    &::placeholder
      color: $primaryColor
      text-align: center
      opacity: 1

    &:not(.active):not(:read-only):hover
      opacity: 0.9

    &.active
      cursor: initial
      width: $inputWidth * 2.23
      left: $buttonWidth / 2
      padding: 10px ($buttonWidth + ($inputHeight - $buttonHeight)) 10px ($inputWidth / 5)

      &::placeholder
        text-align: left

      + button
        display: block
        font-weight: 100

    &.expand
      animation: expand $animationDuration forwards ease-out
      @keyframes expand
        0%
          width: $inputWidth
        10%
          width: $inputWidth * 2.4
        35%
          width: $inputWidth * 2.2
        50%
          width: $inputWidth * 2.24
        100%
          width: $inputWidth * 2.23

    &.collapse
      animation: collapse $animationDuration forwards ease-out
      @keyframes collapse
        0%
          width: $inputWidth * 2.23
        10%
          width: $inputWidth / 1.3
        35%
          width: $inputWidth * 1.03
        50%
          width: $inputWidth / 1.02
        100%
          width: $inputWidth

    + button
      display: none

  button
    width: $buttonWidth
    height: $buttonHeight
    background: $primaryColor
    border: 0
    border-radius: $inputWidth / 3.75
    position: relative
    left: -#{($buttonWidth / 2) + (($inputHeight - $buttonHeight) / 2)}
    color: #fff
    font-size: $inputWidth / 12
    text-transform: uppercase
    cursor: pointer
    outline: none
    z-index: 2
            
          
!
            
              /**
 * Element class
 * > generate a node
 **/
class Element {

    /**
     * global properties of the node
     * @type {{}}
     */
    private node: any = {};

    /**
     * The location where we should insert the generated node
     * @type {{}}
     */
    private where: any = {};

    /**
     * Events binbed to the node
     * @type {{}}
     */
    private events: any = {};

    /**
     * The created element
     */
    private element: HTMLElement = null;

    /**
     Class constructor
     **/
    constructor(options: any = {}) {
        for (const key in options) {
            if (this.hasOwnProperty(key)) {
                this[key] = options[key];
            }
        }
        this.createNode();
        return this.element;
    }

    /**
     Bind events to the node
     **/
    private bindEventsListeners() {
        for (const key in this.events) {
            this.element.addEventListener(key, this.events[key]);
        }
    }

    /**
     Create the node
     **/
    private createNode() {
        const node: HTMLElement = document.createElement(this.node.name);
        if (this.node.content) node.innerHTML = this.node.content;
        for (const key in this.node.attrs) {
            node.setAttribute(key, this.node.attrs[key]);
        }
        this.where.destination.insertAdjacentElement(this.where.position, node);
        this.element = node;
        if (this.element && this.events) {
            this.bindEventsListeners();
        }
    }
}

// ---------------
// FUNCTIONS
// ---------------

/**
 * On input click
 * @param e
 */
function inputClick(e: Event) {
    const target: HTMLElement = e.currentTarget,
        classes: DOMTokenList = target.classList;
    if (!classes.contains('collapse') && !classes.contains('expand') && !classes.contains('active') && !target.getAttribute('readonly')) {
        const animationEnd: EventListenerOrEventListenerObject = () => {
            target.removeEventListener('webkitAnimationEnd', animationEnd);
            target.removeEventListener('animationend', animationEnd);
            classes.remove('expand');
            target.focus();
        };
        classes.add('active', 'expand');
        target.addEventListener('webkitAnimationEnd', animationEnd);
        target.addEventListener('animationend', animationEnd);
        target.setAttribute('placeholder', 'EMAIL');
    }
}

/**
 * On input blur
 * @param e
 */
function inputBlur(e: Event) {
    // Do not hesitate to tell me if you have a cleaner solution to get the active element inside the blur event ! :)
    setTimeout(() => {
        const input: HTMLElement = e.target,
            button: HTMLElement = input.nextSibling,
            target: Element = document.activeElement,
            classes: DOMTokenList = input.classList;
        if (!classes.contains('expand') && classes.contains('active') && target !== button) {
            const placeholder: string = input.dataset.placeholder,
                animationEnd: EventListenerOrEventListenerObject = () => {
                    input.removeEventListener('webkitAnimationEnd', animationEnd);
                    input.removeEventListener('animationend', animationEnd);
                    classes.remove('collapse');
                    input.blur();
                };
            classes.add('collapse');
            classes.remove('active');
            input.addEventListener('webkitAnimationEnd,', animationEnd);
            input.addEventListener('animationend', animationEnd);
            input.value = '';
            input.setAttribute('placeholder', placeholder);
        }
    }, 10);

}

/**
 * On form submit
 */
function formSubmit(e: Event) {
    e.preventDefault();
    const input: Node = e.target.querySelector('input[type=email]');
    input.dataset.placeholder = 'THANK YOU!';
    input.setAttribute('readonly', true);
    input.focus();
    input.blur();
}

// ---------------
// NODES CREATION
// ---------------
const main = new Element({
        'node': {
            'name': 'main'
        },
        'where': {
            'destination': document.querySelector('body'),
            'position': 'beforeEnd'
        }
    }),
    form = new Element({
        'node': {
            'name': 'form'
        },
        'where': {
            'destination': main,
            'position': 'beforeEnd'
        },
        'events': {
            'submit': formSubmit
        }
    }),
    input = new Element({
        'node': {
            'name': 'input',
            'attrs': {
                'type': 'email',
                'placeholder': 'NOTIFY ME',
                'data-placeholder': 'NOTIFY ME',
                'required': 'required'
            }
        },
        'where': {
            'destination': form,
            'position': 'beforeEnd'
        },
        'events': {
            'click': inputClick,
            'blur': inputBlur
        }
    }),
    button = new Element({
        'node': {
            'name': 'button',
            'content': 'SEND',
            'attrs': {
                'type': 'submit',
                'placeholder': 'NOTIFY ME',
                'data-placeholder': 'NOTIFY ME'
            }
        },
        'where': {
            'destination': input,
            'position': 'afterEnd'
        }
    });
            
          
!
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