Angular Elements

About me

Lymarenko Denys

Software Engineer at  JSDaddy

Reusable components

Web Components



Custom elements

Shadow DOM​

HTML templates​

 

HTML Imports



 

<custom-square></custom-square>

<script>

    // add polyfills

    class Square extends HTMLElement {
      static get observedAttributes() {return ['w', 'l']; }

      constructor() {
        super();
    
        var div = document.createElement('div');
        var style = document.createElement('style');
      }
    
      connectedCallback() {
        console.log('Custom square element added to page.');
      }
    
      disconnectedCallback() {
        console.log('Custom square element removed from page.');
      }
    
      adoptedCallback() {
        console.log('Custom square element moved to new page.');
      }
    
      attributeChangedCallback(name, oldValue, newValue) {
        console.log('Custom square element attributes changed.');
      }
    }
    
    customElements.define('custom-square', Square);   
</script>

Solutions

Native JS WebAPI

Webcomponents.org

Polymer

Angular elements

<custom-square></custom-square>

<script>

    // add polyfills

    class Square extends HTMLElement {
      static get observedAttributes() {return ['w', 'l']; }

      constructor() {
        super();
    
        var div = document.createElement('div');
        var style = document.createElement('style');
      }
    
      connectedCallback() {
        console.log('Custom square element added to page.');
      }
    
      disconnectedCallback() {
        console.log('Custom square element removed from page.');
      }
    
      adoptedCallback() {
        console.log('Custom square element moved to new page.');
      }
    
      attributeChangedCallback(name, oldValue, newValue) {
        console.log('Custom square element attributes changed.');
      }
    }
    
    customElements.define('custom-square', Square);   
</script>

Angular elements

A bridge between the DOM APIs and Angular Components

Anyone can use

One framework

DEMO

First Widget (Input, Output)

Widget Usage (set value)

Disadvantages

My Demo app - 450KB(3 components)

SEO

Experimental release

References​

https://www.youtube.com/watch?v=vHI5C-9vH-E

https://www.youtube.com/watch?v=9OM5tXm3R_0

https://github.com/robwormald

https://www.youtube.com/watch?v=N15ie0cGuB0

Thank you for your attention! Questions?

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