Polymer: Templatizer - exception when notifying two-way binding

[tpluscode]

Hi. I've created a sample plunk as an example of using Templatizer. I added two-way binding and it works, but the console logs message TypeError: Cannot use 'in' operator to search for '{prop}' in undefined. Do I somehow use Templatizer the wrong way?

[bedeoverend]

FYI this looks like it's related to / duplicate of #3307 and #3422

[tpluscode]

I've bumped into this again and after some more digging, I've found that this problem occurs only when a templatized template is inserted to DOM outside a Polymer element. For example this will work fine:

<dom-module id="a-test">
  <template>
    <template id="templatizeThis"></template>
  </template>

  <script>
    Polymer({
      behaviors: [ Polymer.Templatizer ],

      attached: function() {
        this.templatize(this.$.templatizeThis);
      }
    });
  </script>
</dom-module>

but this will not (assuming template#templatizeThis is added to document and not import)

<template id="templatizeThis"></template>

<dom-module id="a-test">
  <template>

  </template>

  <script>
    Polymer({
      behaviors: [ Polymer.Templatizer ],

      attached: function() {
        var templatizeThis = document.getElementById('templatizeThis')
        this.templatize(templatizeThis);
      }
    });
  </script>
</dom-module>

The problem also doesn't occur if the templatized templates are created to another custom element's DOM, which is how I use them.

[tpluscode]

Okay, I think I got it. The error is thrown on this line, because _parentProps is undefined.

It is only ever set while annotations are being processed during element registration. With any ad-hoc template (also added to Light DOM inside Polymer element), that routine is never called.

The call tree is desugar -> registerCallback -> ensureRegisterFinished -> _ensureRegisterFinished -> _finishRegisterFeatures -> _prepAnnotations -> _processAnnotations.

Would it be possible to ensure templatized templates are similarly processed when they are first used to ensure annotations are processed?

[tpluscode]

Hi. Is there any chance for a fix? Or any ideas for a possible hack?

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.