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Timing of template stamping in relation to connectedCallback

Asked By: Anonymous

Problem Description

It seems there is a timing issue with Polymer (2.x) when querying for nodes embedded in a template element right after connectedCallback() has been called. I would expect that the first call of this.shadowRoot.querySelectorAll('h1') in the sample below should return all <h1> nodes within the template.
The Mozilla Custom Element Doc states:


Called when the element is inserted into a document, including into a shadow tree

To my understanding, all templates should be already stamped out at this time.

As can be seen in the snippet, the first query returns an empty list. However, the nodes are returned if the query is delayed.

Is there anything I’m missing here?

Sample Code



<!DOCTYPE html>_x000D_
    <meta charset="utf-8">_x000D_
    <base href="">_x000D_
    <a href="http://webcomponentsjs/webcomponents-lite.js">http://webcomponentsjs/webcomponents-lite.js</a>_x000D_
    <link rel="import" href="polymer/polymer-element.html">_x000D_
    <link rel="import" href="polymer/lib/elements/dom-repeat.html">_x000D_
    <dom-module id="x-elem">_x000D_
            <template is="dom-repeat" items="[[testItems]]">_x000D_
            class XElem extends Polymer.Element {_x000D_
                static get is() { return 'x-elem' }_x000D_
                static get properties() {_x000D_
                    return {_x000D_
                        'testItems': {_x000D_
                            type: Array,_x000D_
                            value: function () {_x000D_
                                return [1, 2, 3];_x000D_
                connectedCallback() {_x000D_
                    console.log("Number of nodes after connectedCallback: ", this.shadowRoot.querySelectorAll('h1').length);_x000D_
                    var callback = () => { _x000D_
                        console.log("Number of nodes after timeout: ", this.shadowRoot.querySelectorAll('h1').length); _x000D_
                    setTimeout(callback, 100);_x000D_
            customElements.define(, XElem);_x000D_





Answered By: Anonymous

The connectedCallback does not imply the element has been rendered. You could use Polymer.RenderStatus.afterNextRender for that:

connectedCallback() {
  Polymer.RenderStatus.afterNextRender(this, () => {
    console.log('Number of nodes after connectedCallback: ', this.shadowRoot.querySelectorAll('h1').length);


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