Refer to sibling Polymer element in Dart? -

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for past few hours have been struggling refer sibling element within polymer project. imagine following setup:

/* main.html */ <link rel="import" href="siblinga.html"> <link rel="import" href="siblingb.html">  <polymer-element name="app-main">     <template>         <app-siblinga></app-siblinga>         <app-siblingb></app-siblingb>     </template>     <script type="application/dart" src="main.dart"></script> </polymer-element>  /* siblinga.html, nothing special */ <polymer-element name="app-siblinga">     <template>         <button on-click="{{dosomething))">do something</button>     </template>     <script type="application/dart" src="siblinga.dart"></script> </polymer-element>  /* siblinga.dart */ import 'package:polymer/polymer.dart'; import 'dart:html';  @customtag('app-siblinga') class siblinga extends polymerelement {   bool applyauthorstyles => true;    siblinga.created() : super.created() {   }    void dosomething(mouseevent e, var detail, node target) {     var profile = document.queryselector('app-siblingb');     print(profile); // null, why?   } }

now can app-main node document, fails on getting sibling elements. have tried getting sibling element via shadowroot without success.

how can sibling element, in case app-siblingb, document or shadowroot?

your siblings within shadowdom of <app-main>. document.queryselector() doesn't reach shadowdom of element.

this should work

(parentnode shadowroot).queryselector('app-siblingb');

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