Interoperable Component Patterns
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Though component and custom element patterns have become the standard for web application architecture, communicating from one solution to another remains fogged by guesswork and opinion. How should you write a web component that needs to be compatible with Ember and other frameworks? Where are the tradeoffs between purity of design and ergonomics? In a talk touching on libraries and standards, come learn how to write component code useful across many environments.
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Interoperable Component Patterns
- 11. “The elements of this language are entities called patterns. Each pattern describes a problem that occurs over and over again in our environment, and then describes the core of the solution to that problem, in such a way that you can use this solution a million times over, without ever doing it the same way twice.” –Christopher Alexander
- 12. User-centric
- 14. A pattern is a not a guide to implementation
- 15. ~~ Prelude ~~ What we talk about when we talk about interoperability. and web components
- 16. Rails server builds an HTML string Browser parses HTML string Component boots in the browser Possible Consumer #1
- 17. Rails server builds an HTML string Browser parses HTML string Component boots in the browser Possible Consumer #1
- 18. React template builds some DOM Component boots in the browser Component is implemented w/Vue.js Possible Consumer #2
- 19. Possible Consumer #2 React template builds some DOM Component boots in the browser Component is implemented w/Vue.js
- 20. Riot template is rendered Server-side Component boots on the server Component renders and resulting HTML goes back in the HTTP response Possible Consumer #3
- 21. Riot template is rendered Server-side Component boots on the server Component renders and resulting HTML goes back in the HTTP response Possible Consumer #3
- 22. A component usable from any client-side consumer.
- 23. A component usable from any client-side consumer.
- 25. Ember Template React/JSX Angular 1.x Template Angular 2 Template DOM HTML
- 26. ~~ Pattern #1 ~~ Use Custom Elements via a polyfill
- 28. Angular 2 TemplateEmber Template <my-component> </my-component> React/JSX Angular 1.x Template document.createElement( 'my-component' ); <my-component> </my-component> DOM HTML <my-component> </my-component> <my-component> </my-component> <my-component> </my-component>
- 29. 1 class MyComponent extends HTMLElement { 2 attachedCallback() { 3 console.log('Now attached to the document'); 4 } 5 }; 6 document.registerElement('my-component', MyComponent); Custom Elements Working Draft, 26 February 2016
- 32. 1 class MyComponent extends HTMLElement { 2 attachedCallback() { 3 console.log('Now attached to the document'); 4 } 5 }; 6 window.customElements.define('my-component', MyComponen Custom Elements Working Draft, 29 March 2016
- 34. Angular 2 TemplateEmber Template React/JSX Angular 1.x Template DOM HTML <my-component> </my-component> document.createElement( 'my-component' ); <my-component> </my-component> <my-component> </my-component> <my-component> </my-component> <my-component> </my-component>
- 35. ~~ Pattern #2 ~~ Pass attributes, then deserialize them to properties
- 36. ~~ Pattern #2 ~~ Pass attributes, then deserialize them to properties on change
- 39. <div id="wrapper"></div> let d = document.createElement('div'); d.setAttribute('id', 'wrapper');
- 40. <div id="wrapper"></div> let d = document.createElement('div'); d.setAttribute('id', 'wrapper'); d.getAttribute('id'); // => 'wrapper' d.id; // => 'wrapper'
- 41. let d = document.createElement('div'); d.setAttribute('wrapper-id', 'main'); <div wrapper-id="main"></div>
- 42. let d = document.createElement('div'); d.setAttribute('wrapper-id', 'main'); d.getAttribute('wrapper-id'); // => 'main' d['wrapper-id']; // => undefined <div wrapper-id="main"></div>
- 43. let d = document.createElement('div'); d.setAttribute('hidden', ''); <div hidden></div>
- 44. d.getAttribute('hidden'); // => '' d.hidden; // => true let d = document.createElement('div'); d.setAttribute('hidden', ''); <div hidden></div>
- 45. <div id="wrapper" wrapper-id="main" hidden></div> attribute and property attribute and boolean property attribute, no property
- 46. <div id="wrapper" wrapper-id="main" hidden></div> attribute and property attribute and boolean property attribute, no property
- 55. <div id="wrapper" wrapper-id="main" hidden></div> <select tabindex="3" multiple="" size="-4" form="login"></select>
- 56. 1 <my-component count="3" running></my-component> 1 class MyComponent extends HTMLElement { 2 attachedCallback() { 3 console.log('Now attached to the document'); 4 } 5 }; 6 window.customElements.define('my-component', MyComponen
- 58. DOM Angular 2 TemplateEmber Template let c = document.createElement( ‘my-component' ); c.setAttribute('count', '5'); <my-component count=“5"> </my-component> <my-component count=“5"> </my-component> <my-component count=“5"> </my-component> <my-component count=“5"> </my-component> <my-component count=“5"> </my-component> React/JSX Angular 1.x TemplateHTML
- 59. DOM Angular 2 TemplateEmber Template <my-component count={count}> </my-component> <my-component count={{count}}> </my-component> <my-component count={{count}}> </my-component> <my-component [attr.count]="coun </my-component> React/JSX Angular 1.x TemplateHTML let c = document.createElement( ‘my-component' ); c.setAttribute('count', '5'); <my-component count=“5"> </my-component>
- 60. Back to author concerns
- 61. ~~ Pattern #2 ~~ Pass attributes, then deserialize them to properties
- 62. Polymer: reflecting between an attribute and property 1 Polymer({ 2 is: 'my-component', 3 properties: { 4 count: Number 5 } 6 });
- 63. 1 xtag.register('my-component', { 2 accessors: { 3 count: { 4 attribute: {}, 5 get() { 6 let stringCount = this.getAttribute('count'); 7 return parseInt(stringCount, 10); 8 }, 9 set(numericValue) { 10 let value = ''+numericValue; 11 this.setAttribute('count', value); 12 return value; 13 } 14 } 15 } 16 }); x-tag: reflecting between an attribute and property
- 64. ~~ Pattern #3 ~~ Communicate with events
- 66. <AReactComponent log={function(){ console.log('baz'); }} /> {{an-ember-component log=(action 'log' 'baz')}} Framework components
- 67. Custom Elements <my-component log="function() { console.log('log') }"></my-component>
- 68. HTML Elements div.setAttribute('onclick', ‘console.log("clicked")'); div.onclick = function() { console.log("clicked"); }; div.addEventListener('click', function(e){ window.event = e; try { div.onclick.call(event.target); } finaly() { window.event = null; } } <div onclick="console.log('clicked')"></div>
- 69. Pass an attribute? A string of a function has no context (this is lost) Pass a property? No way to do this in HTML and some frameworks Add an event listener? No way to add an event listener in HTML
- 70. Pass an attribute? A string of a function has no context (this is lost) Pass a property? No way to do this in HTML and some frameworks Add an event listener? No way to add an event listener in HTML
- 71. ~~ Pattern #3 ~~ Communicate with events
- 72. Events are how HTML Elements communicate so Custom Elements should behave the same way Why Events? #1
- 73. <div></div> <my-component></my-component> 1 let event = document.createEvent('Event'); 2 event.initEvent('click', true, true); // canBubble, cancelable 3 element.dispatchEvent(event); 1 let event = document.createEvent('Event'); 2 event.initEvent('click', true, true); // canBubble, cancelable 3 element.dispatchEvent(event);
- 74. Events have a somewhat common interface Why Events? #2
- 75. Event Listener 1 element.addEventListener('click', function(e) { 2 e.target; // What element dispatched the event 3 e.currentTarget; // What element the handler is attached to 4 e.timeStamp; // When the event started 5 // Plus properties and methods about phases 6 }); 1 element.callbackFunction = function() { 2 // What are the arguments this time? 3 }; Callback as property
- 76. <my-component></my-component> 1 let event = document.createEvent('CustomEvent'); 2 event.initCustomEvent('mousewobble', true, true, {direction: 'vertical'}); 3 element.dispatchEvent(event); 1 element.addEventListener('mousewobble', function(e) { 2 e.detail.direction; // 'vertical' 3 });
- 77. Events are compatible with alternative consumer patterns (delegation) Why Events? #3
- 79. Angular 2 Template 1 <my-component (mousewobble)="methodOnComponent($event)"> 2 </my-component> 3 4 <my-component on-mousewobble="methodOnComponent($event)"> 5 </my-component>
- 80. ~~ Pattern #3 ~~ Communicate with events
- 81. ~~ Pattern #1 ~~ Use Custom Elements via a polyfill ~~ Pattern #3 ~~ Communicate with events ~~ Pattern #2 ~~ Pass attributes, then deserialize them to properties
- 82. Practical recommendations for interoperable component authors
- 83. use x-tag or Polymer Practical recommendations for interoperable component authors
- 84. use x-tag or Polymer Practical recommendations for interoperable component authors document usage in several environments
- 85. use x-tag or Polymer Practical recommendations for interoperable component authors document usage in several environments punt on Shadow DOM
- 86. use x-tag or Polymer Practical recommendations for interoperable component authors document usage in several environments punt on Shadow DOM don’t expose implementation details
- 87. ~~ Coda ~~ Ember
- 89. <my-component count="5"></my-component> <my-component {{attribute count=5}}></my-component>
- 90. <my-component count="5"></my-component> <my-component {{attribute count=5}}></my-component> <my-component {{property count=5}}></my-component>
- 91. <my-component count="5"></my-component> <my-component {{attribute count=5}}></my-component> <my-component {{property count=5}}></my-component> <my-component {{style color="red" width=(max a b)}}></my-component>
- 92. <my-component count="5"></my-component> <my-component {{attribute count=5}}></my-component> <my-component {{property count=5}}></my-component> <my-component {{style color="red" width=(max a b)}}></my-component> <my-component {{add-event-listener 'mousewobble' (action 'wobble')}}></my-component>