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February 20, 2019 08:05
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AngularJS 1.5 code to get an "optional callback argument" in components
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.6.10/angular.min.js"></script> | |
| <script src="script.js"></script> | |
| </head> | |
| <body ng-app="app"> | |
| <app-x></app-x> | |
| </body> | |
| </html> |
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| /* | |
| This code makes an AngularJS component callback argument optional. | |
| If you bind to '&?' instead of '&', then the callback function will be undefined | |
| if it's not set by the parent. However, just '&' will just shim it with a function | |
| even if there's no actual function specified. | |
| */ | |
| angular.module('app', []) | |
| .component('appX', { | |
| bindings: { | |
| func: '&?', | |
| }, | |
| template: `<div> | |
| <p>Hello from appX!</p> | |
| <ul> | |
| <li>func is: {{ $ctrl.func }}</li> | |
| </ul> | |
| </div>`, | |
| controller: class { | |
| constructor() { | |
| console.log('[constructor] function is', this.func); | |
| } | |
| $onInit() { | |
| console.log('[$onInit] function is', this.func); | |
| } | |
| } | |
| }); |
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