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Asyc Aurelia Bindings
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| <template> | |
| <!-- Simple usage: --> | |
| <h1>message: ${message1}</h1> | |
| <!-- With a placeholder: --> | |
| <h1>message: ${message1 || '...'}</h1> | |
| <!-- With an unresolved return: --> | |
| <h1>message: ${message2}</h1> | |
| </template> |
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| import {bindableAsync} from './bindable-async'; | |
| export class App { | |
| @bindableAsync() | |
| get message1() { | |
| return this.message3; | |
| } | |
| @bindableAsync({ | |
| unresolvedReturn: '...' | |
| }) | |
| get message2() { | |
| return this.message3; | |
| } | |
| get message3() { | |
| return new Promise((resolve) => setTimeout(() => resolve('Hello World!'), 2000)); | |
| } | |
| } |
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| const defaultOptions = { | |
| unresolvedReturn: undefined | |
| }; | |
| export function bindableAsync(options) { | |
| const _options = { | |
| ...defaultOptions, | |
| ...options | |
| }; | |
| return function(target, name, descriptor) { | |
| if (!Promise || typeof Promise.prototype.then != 'function') { | |
| return; | |
| } | |
| let oldGetter = descriptor.get; | |
| descriptor.get = function observableGetter() { | |
| const promise = oldGetter.call(this); | |
| if (promise.hasOwnProperty('value')) { | |
| return promise; | |
| } | |
| return _options.unresolvedReturn; | |
| }; | |
| descriptor.get.getObserver = function(obj) { | |
| return { | |
| subscribe: function(context, binding) { | |
| if (oldGetter.subscribe) { | |
| oldGetter.subscribe(context, binding); | |
| } | |
| const promise = oldGetter.call(obj); | |
| if (promise && promise.then && typeof promise.then === 'function') { | |
| promise.then(value => binding.updateTarget(value)); | |
| } | |
| }, | |
| unsubscribe: function (...args) { | |
| if (oldGetter.unsubscribe) { | |
| oldGetter.unsubscribe.apply(undefined, args); | |
| } | |
| } | |
| } | |
| }; | |
| } | |
| } |
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| <!doctype html> | |
| <html> | |
| <head> | |
| <title>Aurelia</title> | |
| <meta name="viewport" content="width=device-width, initial-scale=1"> | |
| </head> | |
| <body aurelia-app> | |
| <h1>Loading...</h1> | |
| <script src="https://jdanyow.github.io/rjs-bundle/node_modules/requirejs/require.js"></script> | |
| <script src="https://jdanyow.github.io/rjs-bundle/config.js"></script> | |
| <script src="https://jdanyow.github.io/rjs-bundle/bundles/aurelia.js"></script> | |
| <script src="https://jdanyow.github.io/rjs-bundle/bundles/babel.js"></script> | |
| <script> | |
| require(['aurelia-bootstrapper']); | |
| </script> | |
| </body> | |
| </html> |
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