Method attributeChangedCallback

app/javascript/elements/disable_hidden.js:8–12

(attributeName, oldValue, newValue)

  }

  attributeChangedCallback (attributeName, oldValue, newValue) {
    if (attributeName === 'class' && oldValue !== newValue) {
      this.trigger()
    }
  }

  trigger () {
    const hasHiddenClass = this.classList.contains('hidden')