Paper-dialog shows up behind drawer-panel when placed in a custom element

问题

The paper-dialog shows up behind drawer-panel when launched from a custom element.

Here's the modified "my-greetings.html" custom element from polymer-starter-kit to show a dialog:

<dom-module id="my-greeting">
<style>
:host {
  display: block;
}
@media (max-width: 600px) {
  h1.paper-font-display1 {
    font-size: 24px;
  }
}
</style>
<template>
<paper-dialog id="bigDialog">
  <h2>Scrolling</h2>
  <paper-dialog-scrollable>
    <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>
    <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>
    <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>
    <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>
    <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>
    <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>
    <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>
    <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>
  </paper-dialog-scrollable>
  <div class="buttons">
    <paper-button dialog-dismiss>Cancel</paper-button>
    <paper-button dialog-confirm autofocus>OK</paper-button>
  </div>
</paper-dialog>

<paper-icon-button icon="refresh" on-tap="showDialog">SHOW</paper-icon-button>
</template>
</dom-module>
<script>
  (function() {
    Polymer({
      is: 'my-greeting',

      properties: {
        greeting: {
          type: String,
          value: 'Welcome!',
          notify: true
        }
      },

      showDialog : function(event) {
        var dialog = this.$.bigDialog;
        if (bigDialog) {
          bigDialog.open();
        }
      }

    });
  })();
</script>

How can I style the dialog to appear:

1. on top of drawer-panel and centered in body?
2. centered in content-panel?

Seems like paper-dialog is not built for placing in custom elements. (Try adding modal dialog. Refs : link)

回答1:

I'm not sure exactly what your requirements are, but I was able to use your dialog element and display it above and not obscured by the panel by simply placing it outside of the <paper-drawer-panel>.

Here's what it looks like:

I'm not sure if this is what you want, but to do this, something like the following illustrates a basic example:

  <paper-drawer-panel>
  <paper-header-panel drawer>
    <paper-toolbar>
      <div>Drawer</div>
    </paper-toolbar>
    <paper-menu selected="{{_selected}}">
      <paper-item>Item 1</paper-item>
    </paper-menu>
  </paper-header-panel>
  <paper-header-panel mode="standard" main>
    <paper-toolbar>
      <h1>[[_selected]]</h1>
    </paper-toolbar>
    <neon-animated-pages selected="{{_selected}}">
      <paper-button raised on-tap="showDialog">Show Dialog</paper-button>
      <div>Div</div>
    </neon-animated-pages>
  </paper-header-panel>
</paper-drawer-panel>
<my-greeting id="dialog"></my-greeting>

来源：https://stackoverflow.com/questions/31405906/paper-dialog-shows-up-behind-drawer-panel-when-placed-in-a-custom-element