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Aurelia Size custom attribute
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <title>Dumber Gist</title> | |
| <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1.0, user-scalable=no"> | |
| <base href="/"> | |
| </head> | |
| <!-- | |
| Dumber gist uses dumber bundler, the default bundle file | |
| is /dist/entry-bundle.js. | |
| The starting module is pointed to aurelia-bootstrapper | |
| (data-main attribute on script) for Aurelia, | |
| The aurelia bootstrapper then loads up user module "main" | |
| (aurelia-app attribute on <body>) which is your src/main.js. | |
| --> | |
| <body aurelia-app="main"> | |
| <script src="/dist/entry-bundle.js" data-main="aurelia-bootstrapper"></script> | |
| </body> | |
| </html> |
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| { | |
| "dependencies": { | |
| "aurelia-bootstrapper": "^2.3.3" | |
| } | |
| } |
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| <template> | |
| <require from="./size-observer"></require> | |
| <style>textarea { display: block; }</style> | |
| <!-- Try to create a css/scss/sass/less file then require it here --> | |
| <h1>${message}</h1> | |
| Width: ${size.width || 0} -- Height: ${size.height || 0} | |
| <hr> | |
| <textarea size.bind="size"></textarea> | |
| <!-- <let/> --> | |
| <h1> | |
| Observing size in a reapeat with <let/> | |
| </h1> | |
| <div repeat.for="i of 5"> | |
| <let $size.bind="null"></let> | |
| Width: ${$size.width} -- Height: ${$size.height} | |
| <textarea size.bind="$size"></textarea> | |
| </div> | |
| </template> |
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| export class App { | |
| message = 'Hello Aurelia!'; | |
| } |
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| export function configure(aurelia) { | |
| aurelia.use | |
| .standardConfiguration() | |
| .developmentLogging('info'); | |
| aurelia.start().then(() => aurelia.setRoot()); | |
| } |
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| import { DOM, customAttribute, bindingMode } from 'aurelia-framework'; | |
| @customAttribute('size', bindingMode.fromView) | |
| export class SizeCustomAttribute { | |
| static inject() { | |
| return [DOM.Element]; | |
| } | |
| constructor(el) { | |
| this.el = el; | |
| } | |
| bind() { | |
| this.observer = this.getObserver(); | |
| this.observer.observe(this.el); | |
| } | |
| unbind() { | |
| this.observer.disconnect(); | |
| this.observer = void 0; | |
| } | |
| getObserver(el) { | |
| if (typeof ResizeObserver === 'function') { | |
| return new ResizeObserver(records => { | |
| const rect = records[0].contentRect; | |
| this.value = { width: rect.width, height: rect.height }; | |
| }); | |
| return observer; | |
| } else { | |
| return new ElementSizeDirtyChecker(size => { | |
| this.value = size; | |
| }); | |
| } | |
| } | |
| } | |
| // the interface of this class is kept similar to ResizeObserver | |
| class ElementSizeDirtyChecker { | |
| constructor(callback, rate = 330 /*3 times a second*/) { | |
| this.callback = callback; | |
| this.rate = rate; | |
| this.size = { width: 0, height: 0 }; | |
| } | |
| observe(el) { | |
| this.timerId = setInterval(() => { | |
| const { width, height } = el.getBoundingClientRect(); | |
| const currentSize = this.size; | |
| if (width !== currentSize.width || height !== currentSize.height) { | |
| this.size = { width: rect.width, height: rect.height }; | |
| if (typeof this.callback === 'function') { | |
| this.callback(this.size); | |
| } | |
| } | |
| }, this.rate); | |
| } | |
| disconnect() { | |
| clearInterval(this.timerId); | |
| } | |
| } |
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