Css Zero Showcase
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<input type="text" name="tags" id="tags" value="incrivel,impressionante" autocomplete="off" placeholder="Quão legal é isso?" data-controller="combobox" data-combobox-option-create-value="Adicionar" data-combobox-no-results-value="Nenhum resultado encontrado" />
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<%= text_field_tag :tags, "incrivel,impressionante", autocomplete: "off", placeholder: "Quão legal é isso?", data: { controller: "combobox", combobox_option_create_value: "Adicionar", combobox_no_results_value: "Nenhum resultado encontrado" } %>
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.ts-control {
  align-items: center;
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--rounded-md);
  min-block-size: var(--size-10);
  color: var(--color-text);
  display: inline-flex;
  font-size: var(--text-sm);
  gap: var(--size-1);
  line-height: inherit;
  padding: var(--size-2) var(--size-3);
  > input {
    color: inherit; font-size: inherit;
  }
}
.ts-dropdown {
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--rounded-md);
  box-shadow: var(--shadow-md);
  color: var(--color-text);
  font-size: var(--text-sm);
  line-height: inherit;
  .ts-dropdown-content:not(:has(.optgroup)) {
    padding: var(--size-1);
  }
  .optgroup:not(:first-child) {
    border-block-start-width: var(--border);
  }
  .optgroup {
    padding: var(--size-1);
  }
  .optgroup-header {
    background-color: inherit;
    color: var(--color-text-subtle);
    font-size: var(--text-xs);
    padding: var(--size-1_5) var(--size-2);
  }
  .create {
    padding: var(--size-1_5) var(--size-2);
  }
  .option {
    border: 1px solid transparent;
    border-radius: var(--rounded-md);
    padding: var(--size-1_5) var(--size-2);
  }
  .active {
    background-color: var(--color-secondary);
    color: inherit !important;
  }
  .highlight {
    background-color: transparent !important;
  }
  .spinner {
    margin: var(--size-1_5) 0 0;
  }
  .spinner::after {
    border-block-color: var(--color-border-dark);
  }
}
.ts-wrapper.single .ts-control {
  background-color: var(--color-bg) !important;
  background-image: url("select-arrow.svg") !important;
  background-position: center right var(--size-2) !important;
  background-repeat: no-repeat !important;
  background-size: var(--size-4) auto !important;
}
.ts-wrapper.multi .ts-control > .item {
  background: var(--color-secondary);
  border-radius: var(--rounded-md);
  color: inherit;
  line-height: var(--leading-tight);
  margin: 0;
}
.disabled .ts-control {
  opacity: var(--opacity-50);
}
.disabled .ts-control * {
  cursor: not-allowed !important;
}
.invalid .ts-control {
  border-color: var(--color-negative);
}
[data-controller*="combobox"] {
  clip: rect(0 0 0 0);
  position: absolute;
}
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import { Controller } from "@hotwired/stimulus"
import { get } from "https://cdn.skypack.dev/@rails/request.js@0.0.11?min"
import TomSelect from "https://cdn.skypack.dev/tom-select@2.3.1?min"
export default class extends Controller {
  static values = { url: String, optionCreate: { type: String, default: "Add" }, noResults: { type: String, default: "No results found" } }
  initialize() {
    this.load = this.load.bind(this)
  }
  connect() {
    if (this.element.nodeName === "INPUT") {
      this.tomSelect = new TomSelect(this.element, this.#inputSettings)
    } else {
      this.tomSelect = new TomSelect(this.element, this.#selectSettings)
    }
  }
  disconnect() {
    this.tomSelect.destroy()
  }
  async load(query, callback) {
    const response     = await get(this.urlValue, { responseKind: "json", query: { q: query } })
    const jsonResponse = await response.json
    callback(jsonResponse)
  }
  get #inputSettings() {
    return { render: this.#render, load: this.#loadSetting, persist: false, createOnBlur: true, create: true }
  }
  get #selectSettings() {
    return { render: this.#render, load: this.#loadSetting }
  }
  get #render() {
    return {
      option_create: (data, escape) => {
        return `<div class="create">${this.optionCreateValue} <b>${escape(data.input)}</b>...</div>`
      },
      no_results: () =>  {
        return `<div class="no-results">${this.noResultsValue}</div>`
      }
    }
  }
  get #loadSetting() {
    return this.hasUrlValue && this.load
  }
}

Dependencies