css - 带有 flexbox 的 polymer iron-list

Question

我正在努力让 iron-list 与 iron-flex-layout 和 paper-card 一起玩。我希望 paper-card 在两个轴上 flex 扩展以覆盖页面(其边距作为保险杠)，然后是 iron-list在其容器中垂直扩展，以显示我的 iron-list 及其所有“虚拟列表”魔法。

我哪里错了？

<script src="https://cdn.rawgit.com/Download/polymer-cdn/24b44b55/lib/webcomponentsjs/webcomponents-lite.min.js"></script>

<link rel="import" href="https://cdn.rawgit.com/Download/polymer-cdn/24b44b55/lib/paper-card/paper-card.html">
<link rel="import" href="https://cdn.rawgit.com/Download/polymer-cdn/24b44b55/lib/paper-progress/paper-progress.html">
<link rel="import" href="https://cdn.rawgit.com/Download/polymer-cdn/24b44b55/lib/iron-flex-layout/iron-flex-layout-classes.html">
<link rel="import" href="https://cdn.rawgit.com/Download/polymer-cdn/24b44b55/lib/iron-list/iron-list.html">

<style is="custom-style" include="iron-flex iron-flex-alignment iron-positioning">
  body {
    margin: 0;
    height: 100vh;
  }

  paper-card {
    margin: 1em;
  }

  iron-list {
    border-bottom: 1px solid #f00;
    border-top: 1px solid #000;
  }
</style>

<div class="vertical layout">
  <template is="dom-bind" id="app">
    <paper-card heading="My paper card" class="flex">
      <div class="card-content layout vertical">
        <div>[[listing.length]]</div>
          <iron-list items="[[listing]]" class="flex">
            <template>
              <div class="layout horizontal">
                <div>[[item.name]]</div>
                <div>[[item.value]]</div>
              </div>
            </template>a
          </iron-list>
      </div>
    </paper-card>
  </template>
</div>

<script>
  "use strict";

  window.addEventListener('WebComponentsReady', e => {
    app.listing = [];
    for (var i = 0; i < 100; i++) {
      app.push('listing', { name: i, value: i });
    }
  });
</script>

fiddle :https://jsfiddle.net/4czLkjfj/

Answer 1

您已将 body 元素设置为 height: 100vh。

但是，这个高度不会被向下一级的 flex 容器继承。

一种解决方案是将display: flex 添加到body。这将创建一个 flex 容器，它会自动将 align-items: stretch 应用于子项。

body {
  display: flex;
  align-items: stretch; /* initial setting; can be omitted */
}

div.vertical.layout {
  flex: 1; /* full width */
}

revised fiddle

另一种解决方案是简单地告诉 flex 容器继承父级的高度。

div.vertical.layout {
  height: 100%;
}

revised fiddle

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修改后的解决方案 基于评论中的反馈:demo