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July 30, 2015 00:16
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Access a specific record in a firebase-collection based on array bind in Polymer
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| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="utf-8"> | |
| <title>Firebase + Polymer + Array Access</title> | |
| <meta name="viewport" content="width=device-width, initial-scale=1.0"> | |
| <meta name="apple-mobile-web-app-capable" content="yes"> | |
| <meta name="mobile-web-app-capable" content="yes"> | |
| <script src="bower_components/webcomponentsjs/webcomponents-lite.js"></script> | |
| <link rel="import" href="bower_components/polymer/polymer.html"> | |
| <link rel="import" href="bower_components/firebase-element/firebase-collection.html"> | |
| <link rel="import" href="person-by-index.html"> | |
| <style type="text/css"> | |
| body { | |
| font-family: Roboto, Helvetica, sans-serif; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <template is="dom-bind"> | |
| <firebase-collection | |
| location="https://polymer-ele-testing.firebaseio.com/people" | |
| data="{{people}}" log></firebase-collection> | |
| <person-by-index records="[[people]]" index="2"></person-by-index> | |
| </template> | |
| </body> | |
| </html> |
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| <link rel="import" href="bower_components/polymer/polymer.html"> | |
| <dom-module id="person-by-index"> | |
| <style> | |
| :host { | |
| display: block; | |
| padding: 1em; | |
| } | |
| input { | |
| width: 50%; | |
| } | |
| </style> | |
| <template> | |
| <div> | |
| Index <span>[[index]]</span>: | |
| <span>[[arrayItem(records.*, 'person')]]</span> | |
| </div> | |
| </template> | |
| <script> | |
| (function() { | |
| Polymer({ | |
| is: 'person-by-index', | |
| properties: { | |
| records: Array, | |
| index: Number | |
| }, | |
| // respin from docs: | |
| // https://www.polymer-project.org/1.0/docs/devguide/data-binding.html#array-binding | |
| arrayItem: function(change, path) { | |
| return this.get(path, change.base[this.index]); | |
| } | |
| }); | |
| })(); | |
| </script> | |
| </dom-module> |
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