Fijn

Textarea component: Valid 

<div class="form-group d-flex flex-wrap">
    <label class="flex-grow-1">Omschrijving situatie</label>
    <textarea name="textArea" class="form-control is-valid" rows="7" placeholder="Omschrijving situatie"></textarea>

</div>
 
<div class="{% if comment == false %}form-group {% endif %}d-flex flex-wrap{% if button %} position-relative{% endif %}">
    <label class="flex-grow-1">{{label}}</label>
    {% render '@textarea', {label:label, invalid:invalid, valid:valid, disabled:disabled, readonly:readonly, add_field:add_field, rows:rows, comment:comment, text:text, placeholder:placeholder}, true %}
    {% if show_feedback %}<div class="{% if valid %}valid-feedback{% endif %}{% if invalid %}invalid-feedback{% endif %}{% if feedback_message %} d-inline-block{% endif %}"><strong>{{feedback_message}}</strong></div>{% endif %}
</div>
 
{
  "label": "Omschrijving situatie",
  "invalid": false,
  "valid": true,
  "feedback_message": "Textarea is invalid",
  "show_feedback": false,
  "disabled": false,
  "readonly": false,
  "button": false,
  "rows": 7,
  "comment": false,
  "text": "",
  "add_field": false
}

Validatie

When a field is invalid or valid, the class .is-invalid or .is-valid should be added to the field. If a feedback message should be displayed please look at the following example:

 <textarea name="textArea" class="form-control is-invalid" rows="7" placeholder="Omschrijving situatie"></textarea>

It is also possible to already add the feedback div to the HTML before the message is displayed to the user. This is because the .invalid-feedback or .valid-feedback are hidden by default. By adding the class .d-inline-block it will be visible.