javascript erb 27 lines · 2 tabs

Stimulus: copy-to-clipboard with fallback + selection

Sarah Chen Jan 2026

2 tabs

import { Controller } from "@hotwired/stimulus"

export default class extends Controller {
  static targets = ["source"]

  async copy() {
    const text = this.sourceTarget.value || this.sourceTarget.textContent

    try {
      await navigator.clipboard.writeText(text)
    } catch (_) {
      const range = document.createRange()
      range.selectNodeContents(this.sourceTarget)
      const sel = window.getSelection()
      sel.removeAllRanges()
      sel.addRange(range)
      document.execCommand("copy")
      sel.removeAllRanges()
    }

    this.element.dispatchEvent(new CustomEvent("clipboard:copied", { bubbles: true }))
  }
}

<div data-controller="clipboard" data-action="clipboard:copied->toast#show">
  <pre data-clipboard-target="source"><%= @snip.code_blocks.first.code %></pre>
  <button type="button" data-action="clipboard#copy">Copy</button>
</div>

2 files · javascript, erb Explain with highlit

Copy buttons are deceptively tricky across browsers. This Stimulus controller uses the Clipboard API when available, falls back to execCommand, and provides a hook for “Copied!” UI.

Related snips

ruby

class CommentsController < ApplicationController
  before_action :set_post

  def create
    @comment = @post.comments.build(comment_params)

System test: asserting Turbo Stream responses

rails hotwire turbo

by codesnips 4 tabs

ruby

class Post < ApplicationRecord
  belongs_to :author, class_name: 'User'
  has_many :comments, dependent: :destroy

  scope :published, -> { where.not(published_at: nil).where('published_at <= ?', Time.current) }
  scope :draft, -> { where(published_at: nil) }

ActiveRecord scopes for reusable query logic

rails activerecord patterns

by Alex Kumar 1 tab

ruby

module Api
  module V1
    class UsersController < BaseController
      def show
        user = User.includes(:profile).find(params[:id])

ETags for conditional requests and caching

rails caching http-caching

by Alex Kumar 1 tab

ruby

class PostsController < ApplicationController
  def index
    @posts = Post.includes(:author)
                 .order(created_at: :desc)
                 .page(params[:page])
                 .per(10)

Turbo Frames: infinite scroll with lazy-loading frame

rails turbo hotwire

by codesnips 4 tabs

ruby

require "csv"

class PeopleCsvStream
  include Enumerable

  HEADERS = %w[id full_name email signed_up_at plan].freeze

Resilient CSV Export as a Streamed Response

rails performance streaming

by codesnips 3 tabs

erb

<form data-controller="query-sync" data-action="change->query-sync#apply">
  <select name="status" class="rounded border p-2">
    <option value="">Any</option>
    <option value="open">Open</option>
    <option value="closed">Closed</option>
  </select>

Filter UI that syncs query params via Stimulus (no front-end router)

rails hotwire stimulus

by Henry Kim 2 tabs

Share this code

Here's the card — post it anywhere.

Stimulus: copy-to-clipboard with fallback + selection — share card

Link copied