将Polymer 1.0片段重写为Polymer 2

Question

I have found a Polymer 1 sample and I would like to use it in my Polymer 2 application.

   <app-header-layout>

    <app-header fixed effects="waterfall" slot="header">
      <app-toolbar>
        <paper-icon-button id="toggle" icon="menu"></paper-icon-button>
        <div main-title>Inbox</div>
      </app-toolbar>
    </app-header>

    <app-drawer-layout id="drawerLayout">

      <app-drawer slot="drawer">
         ...
      </app-drawer>

      <sample-content size="100"></sample-content>

    </app-drawer-layout>

  </app-header-layout>

  <script>
    var drawerLayout = document.getElementById('drawerLayout');
    toggle.addEventListener('click', function() {
      if (drawerLayout.forceNarrow || !drawerLayout.narrow) {
        drawerLayout.forceNarrow = !drawerLayout.forceNarrow;
      } else {
        drawerLayout.drawer.toggle();
      }
    });
  </script>

The small part that would have to be changed for Polymer 2 is just the js code at the bottom, but since I am new to Polymer and js, all my previous attempts to change the code to the new ES6 syntax didn't work out.

Any help would be really appreciated!

Answer 1

The Polymer 2.0 equivalent (in ES6) of that JavaScript would be this element definition:

class XFoo extends Polymer.Element {
  static get is() { return 'x-foo'; }

  ready() {
    super.ready();

    const drawerLayout = this.$.drawerLayout;
    this.$.toggle.addEventListener('click', () => {
      if (drawerLayout.forceNarrow || !drawerLayout.narrow) {
        drawerLayout.forceNarrow = !drawerLayout.forceNarrow;
      } else {
        drawerLayout.drawer.toggle();
      }
    });
  }
}

demo