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Aurelia Gist - Custom Binding Behavior
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| <template> | |
| <require from='unique-binding-behavior'></require> | |
| <h1>${title}</h1> | |
| <form> | |
| <label>User Name</label> | |
| <input value.bind="username & unique:uniqueFunc & debounce:800"> | |
| <p class="help-text">${lookupResult}</p> | |
| </form> | |
| </template> |
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| export class App { | |
| title = 'Custom Binding Behavior'; | |
| username = ''; | |
| uniqueNames = ['matt', 'kevin', 'larry']; | |
| lookupResult = ''; | |
| uniqueFunc; | |
| constructor() { | |
| this.uniqueFunc = (method, update, value) => { | |
| if (this.uniqueNames.includes(value)) { | |
| this.lookupResult = 'Sorry this username has already been used.'; | |
| } | |
| else { | |
| this.lookupResult = ''; | |
| } | |
| update(value); | |
| }; | |
| } | |
| } |
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| <!doctype html> | |
| <html> | |
| <head> | |
| <title>Aurelia</title> | |
| <meta name="viewport" content="width=device-width, initial-scale=1"> | |
| <style> | |
| .panel { | |
| border: 1px solid black; | |
| } | |
| .panel-heading { | |
| background: lightblue; | |
| color: white; | |
| border-bottom: 1px solid black; | |
| padding: 3px; | |
| font-size: 20px; | |
| } | |
| .panel-body { | |
| padding: 3px; | |
| } | |
| </style> | |
| </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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| const interceptMethods = ['updateTarget', 'updateSource', 'callSource']; export class UniqueBindingBehavior { bind(binding, scope, uniqueFunc) { let i = interceptMethods.length; while (i--) { let method = interceptMethods[i]; if (!binding[method]) { continue; } binding[`intercepted-${method}`] = binding[method]; let update = binding[method].bind(binding); binding[method] = uniqueFunc.bind(binding, method, update); } } unbind(binding, scope) { let i = interceptMethods.length; while (i--) { let method = interceptMethods[i]; if (!binding[method]) { continue; } binding[method] = binding[`intercepted-${method}`]; binding[`intercepted-${method}`] = null; } } } |
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