在 Polymer 2.0 中定义函数时出错

Question

我想通过单击工具栏左上角的菜单按钮来切换 paper-drawer。问题是我在控制台中收到以下错误：

"ReferenceError: _toggle is not defined at HTMLElement.onclick (http://null.jsbin.com/runner:1:1805)"

http://jsbin.com/degifisici/1/edit?html,console,output

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>

  <base href="http://polygit.org/polymer+:master/components/">
  <script src="webcomponentsjs/webcomponents-lite.js"></script>
  <link rel="import" href="polymer/polymer-element.html">
  <link rel="import" href="app-layout/app-layout.html">
  <link rel="import" href="iron-icons/iron-icons.html">
  <link rel="import" href="iron-icon/iron-icon.html">
  <link rel="import" href="paper-item/paper-icon-item.html">
  <link rel="import" href="paper-icon-button/paper-icon-button.html">

</head>
<body>
  <dom-module id="my-el">
    <template>
      <app-header reveals>
        <app-toolbar>
          <paper-icon-button icon="menu" onclick="_toggle"></paper-icon-button>
          <div main-title>My app</div>
          <paper-icon-button icon="delete"></paper-icon-button>
          <paper-icon-button icon="search"></paper-icon-button>
          <paper-icon-button icon="close"></paper-icon-button>
          <paper-progress value="10" indeterminate bottom-item></paper-progress>
        </app-toolbar>
      </app-header>
      <app-drawer id="drawer" swipe-open></app-drawer>
    </template>
    <script>
      class MyEl extends Polymer.Element {
        static get is() { return 'my-el' }

        constructor() {
          super();
        }

        ready() {
          super.ready();
        }

        _toggle() {
          var drawer = this.$.drawer;
          drawer.toggle();
        }

      }
      customElements.define(MyEl.is, MyEl);
    </script>
  </dom-module>

  <my-el></my-el>
</body>
</html>

Answer 1

将 onclick 更改为 on-click，您可能还需要导入 gestures-event-listener。

<link rel="import" href="polymer/lib/mixins/gesture-event-listeners.html">

在 Polymer 2.0 中定义函数时出错

Error defining function in Polymer 2.0

polymer

polymer-2.x