manyfold/app/javascript/controllers/editable_controller.ts

import { Controller } from '@hotwired/stimulus'

// Connects to data-controller="editable"
export default class extends Controller {
  input (): HTMLInputElement {
    return this.element as HTMLInputElement
  }

  field (): string {
    return this.input().dataset.editableField ?? ''
  }

  path (): string {
    return this.input().dataset.editablePath ?? ''
  }

  value (): string {
    return this.input().innerText?.trim()
  }

  initialText: string | null = null

  onFocus (): void {
    this.initialText = this.value()
  }

  onBlur (): void {
    if (this.initialText !== this.value()) {
      const data = new FormData()
      data.append(this.field(), this.value())
      data.append('authenticity_token', document.querySelector('meta[name="csrf-token"]')?.getAttribute('content') ?? '')
      void fetch(
        this.path(),
        {
          method: 'PATCH',
          redirect: 'manual',
          body: data
        }
      )
    }
  }
}