I need to email multiple addresses from a composite element in a webform. Using a Computed Twig element with this code:

{% for m in data.member_information %}
{{ m.email }}
{% endfor %}

The email addresses are listed line by line in Results.

[email protected]
[email protected]

I guess that means they're in an array, but I'm not sure. Here's the configuration of the composite element:

id: member_information
uuid: 591d262f-998d-4ade-8e40-56d8119592dd
status: true
label: 'Member Information'
elements: |
    '#type': textfield
    '#required': true
    '#title': 'First Name'
    '#type': textfield
    '#title': 'Middle Name'
    '#type': textfield
    '#required': true
    '#title': 'Last Name'
    '#type': tel
    '#required': true
    '#title': Phone
    '#type': tel
    '#title': 'Cell Phone'
    '#type': email
    '#required': true
    '#title': Email
description: 'Group Nomination composite.'
langcode: en
dependencies: {  }

The configuration uses the webform composite module.

In the handler, the email addresses need to be a comma separated list in the To email field, like this:

[email protected],[email protected]

I've tried

{% for m in data.member_information %}
{{ m.email|join(',') }}
{% endfor %}

In Results, email addresses are still listed line by line.

How do I convert the line separated list to a comma separated string in the twig template?

  • How sure are you this is an array? It could be a line break. What is the configuration of the composite element?
    – cilefen
    Jul 14, 2023 at 22:54

1 Answer 1


You don't have an array of email addresses, you have an array of composite field items.

So loop over the field items, build the array of emails

{% set emails = [] %}
{% for m in data.member_information %}
  {% set emails = emails|merge([m.email]) %}
{% endfor %}

and then output the joined array:

{{ emails|join(',') }}
  • Works perfectly. Thank you.
    – esod
    Jul 15, 2023 at 21:36

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