聚合物1.0：在纸张菜单元素中使用模板dom-repeat来显示选择的铁页面

使用polymer 1.0,我创建了一个纸质抽屉面板布局.在抽屉里,我有一个使用纸质菜单的菜单,纸质菜单被绑在铁页上.我从 Content Switcheroo with Core-Pages — Polycasts #09开始采用这个例子并将其转换为使用polymer 1.0元素.在下面的代码中,您可以看到我的评论部分,其中纸质项目是硬编码的.这很好用.

我的下一步是尝试使用< template is =“dom-repeat”>动态构建我的菜单.迭代任意数组菜单项的元素.菜单正确呈现(我可以看到绑定到数组的所有菜单项),但我无法点击这些项目,也没有显示铁页面.似乎用于attr-for-selected的data-category属性在< template is =“dom-repeat”>内部不起作用.

我可以通过哪些方式实现这一目标？
编辑：删除attr-for-selected属性并使用索引工作切换铁页,但在我的情况下,依赖于数组的索引不是一个选项.

我的index.html如下：

<!DOCTYPE html>
<html>
<head>
<Meta charset="UTF-8">
<Meta name="viewport" content="width=device-width,minimum-scale=1.0,initial-scale=1.0,user-scalable=yes">
<Meta name="mobile-web-app-capable" content="yes">
<Meta name="apple-mobile-web-app-capable" content="yes">
<title>My Test</title>
<script src="bower_components/webcomponentsjs/webcomponents-lite.min.js"></script>
<link rel="import" href="bower_components/polymer/polymer.html">
<link rel="import" href="bower_components/iron-icons/iron-icons.html">
<link rel="import" href="bower_components/iron-pages/iron-pages.html">
<link rel="import" href="bower_components/paper-drawer-panel/paper-drawer-panel.html">
<link rel="import" href="bower_components/paper-toolbar/paper-toolbar.html">
<link rel="import" href="bower_components/paper-header-panel/paper-header-panel.html">
<link rel="import" href="bower_components/paper-icon-button/paper-icon-button.html">
<link rel="import" href="bower_components/paper-item/paper-item.html">
<link rel="import" href="bower_components/paper-styles/paper-styles.html">
<link rel="import" href="bower_components/paper-menu/paper-menu.html">
<style>
</style>
</head>
<body>
<my-app></my-app>
<dom-module id="my-app">
<style>
</style>
<template>
<paper-drawer-panel>
  <paper-header-panel drawer class="fit">
    <paper-toolbar>
      <div>Drawer</div>
    </paper-toolbar>
    <paper-menu class="content fit" selected="{{page}}" attr-for-selected="data-category">
      <!-- This works -->
<!--
        <paper-item data-category="item1" label="item1">
            <span>John Smith</span>
        </paper-item>
        <paper-item data-category="item2" label="item2">
            <span>Jane Doe</span>
        </paper-item>
-->

      <!-- This does not work -->
      <template is="dom-repeat" items="{{names}}">
        <paper-item data-category="{{item.itemNum}}" label="{{item.itemNum}}">
          <span>{{item.first}}</span><span>{{item.last}}</span><span>{{item.itemNum}}</span>
        </paper-item>
      </template>

    </paper-menu>
  </paper-header-panel>
  <paper-header-panel main class="fit">
    <paper-toolbar>
      <paper-icon-button icon="menu" paper-drawer-toggle></paper-icon-button>
      <div class="flex">Main Content</div>
    </paper-toolbar>
    <iron-pages selected="{{page}}" attr-for-selected="data-category">
      <section data-category="item1">
        <h1>Item 1</h1>
        <div>Item 1 content...</div>
      </section>
      <section data-category="item2">
        <h1>Item 2</h1>
        <div>Item 2 content...</div>
      </section>
    </iron-pages>
  </paper-header-panel>
</paper-drawer-panel>
</template>
<script>
polymer({
  is: "my-app",ready: function() {
    this.names = [{itemNum: "item1",first: "John",last: "Smith"},{itemNum: "item2",first: "Jane",last: "Doe"}];
  }
});
</script>
</dom-module>
</body>
</html>

解决方法

从文档中尝试< paper-item data-category $=“{{item.itemNum}}”label $=“{{item.itemNum}}”>,这将调用paper-item.setAttribute(‘data -category’,itemNum)而不是paper-item.data-category = itemNum.

https://www.polymer-project.org/1.0/docs/devguide/data-binding.html#attribute-binding

原文地址：https://www.jb51.cc/html/242460.html

聚合物1.0：在纸张菜单元素中使用模板dom-repeat来显示选择的铁页面

解决方法

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