推送到 dom-repeat 中使用的数据绑定数组（聚合物）

Question

我在自定义 Polymer 元素中有一个数据绑定数组 (dom-repeat)，我需要将新数据推送到数组中。它不显示项目，即使它知道已添加 2 个元素。我在这里错过了什么？

<link rel="import" href="../../bower_components/polymer/polymer.html">

<dom-module id="main-element">
<template>
    <ul>
        <template is="dom-repeat" items="{{people}}">
            <li>{{item.first}}</li>
        </template>
    </ul>
</template>

<script>
    (function() {
        'use strict';
        Polymer({
            is: 'main-element',
            properties: {
                people: {
                    type: Array,
                    value: function() {
                        return [];
                    }
                }
            },
            ready: function() {
                // Mock data retrieval
                this.people.push({"first": "Jane", "last": "Doe"});
                this.people.push({"first": "Bob", "last": "Smith"});
            }
        });
    })();
</script>

Answer 1

将项目推入数组时使用 Polymer 的 array mutation methods：

this.push('people', {"first": "Jane", "last": "Doe"});
this.push('people', {"first": "Bob", "last": "Smith"});

<head>
  <base href="https://polygit.org/polymer+1.7.0/components/">
  <script src="webcomponentsjs/webcomponents-lite.min.js"></script>
  <link rel="import" href="polymer/polymer.html">
</head>

<body>
  <main-element></main-element>

  <dom-module id="main-element">
    <template>
      <ul>
        <template is="dom-repeat" items="{{people}}">
          <li>{{item.first}}</li>
        </template>
      </ul>
    </template>

    <script>
      HTMLImports.whenReady(function() {
        'use strict';
        Polymer({
          is: 'main-element',
          properties: {
            people: {
              type: Array,
              value: function() {
               return [];
              }
            }
          },
          ready: function() {
            // Mock data retrieval
            this.push('people', {"first": "Jane", "last": "Doe"});
            this.push('people', {"first": "Bob", "last": "Smith"});
          }
        });
      });
    </script>
  </dom-module>
</body>

codepen

推送到 dom-repeat 中使用的数据绑定数组（聚合物）

Pushing to data-bound array used in dom-repeat (Polymer)

javascript

data-binding

polymer

dom-repeat