auto-validate not work in paper-textarea with custom validator

[jtrs]

Description

The paper-textarea element not call the validator function like a paper-input element.

Expected outcome

Validator function for paper-textarea should be called.

Actual outcome

Validator function for paper-textarea don't call.

Live Demo

https://plnkr.co/edit/VtKvhY?p=preview

Steps to reproduce

1. Type in Label_2 (paper-textarea) a chararacter
2. It should be shown en error messege, but don't
3. Type in Label_1 (paper-input) a chararacter
4. The error message is visible

   Browsers Affected

• [x ] Chrome (Only tryed in Chrome)
• [ ] Firefox
• [ ] Safari 9
• [ ] Safari 8
• [ ] Safari 7
• [ ] Edge
• [ ] IE 11
• [ ] IE 10

[samuelli]

Looks like a pretty frustrating bug when using custom validators.

The validator property on the input element doesn't get bound to the nested input element. A workaround involves reaching in and binding it together.

this.$['paper-textarea-instance'].$['input'].validator = this.$['paper-textarea-instance'].validator;

[TimLuq]

I also ran into this. Is this by design or an oversight? The documentation specifically states:

Validation

Currently only required and maxlength validation is supported.

-- Yvonne Yip, May 25, 2015

I see that @jtrs tried to fix this themselves but the PR #450 failed CLA and the interest was dropped.

[DomNomNom]

Still running into this.