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@polst-web/widget

v0.7.3

Published

Embeddable POLST widget (script/SDK mode). Zero runtime deps, Shadow DOM rendering.

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Readme

@polst-web/widget

Embeddable POLST widget for script-tag / SDK embedding. Zero runtime dependencies, browser-only, style-isolated via Shadow DOM.

Install

npm install @polst-web/widget

Or load from a CDN (no install needed):

<script
  type="module"
  async
  src="https://unpkg.com/@polst-web/widget/dist/widget.esm.js"
></script>

<!-- or jsdelivr -->
<script
  type="module"
  async
  src="https://cdn.jsdelivr.net/npm/@polst-web/widget/dist/widget.esm.js"
></script>

Pin to a specific version (@polst-web/[email protected] or @0.7.0) for production stability.

Quick start

Drop a marker element anywhere on your page; the widget hydrates it on DOMContentLoaded:

<!-- single polst -->
<div data-polst="abc123def456"></div>

<!-- campaign player -->
<div data-polst-campaign="cmp_456" data-auto-advance="true"></div>

<!-- brand feed -->
<div data-polst-brand="acme" data-mode="mixed"></div>

<script
  type="module"
  async
  src="https://unpkg.com/@polst-web/widget/dist/widget.esm.js"
></script>

Each hydrated container is style-isolated inside a Shadow DOM root — host-page CSS does not leak in, widget CSS does not leak out.

Self-mounting <script> (Disqus / Intercom pattern)

A single tag both loads the widget and renders an embed:

<!-- inline: creates a sibling div immediately before the script -->
<script
  src="https://unpkg.com/@polst-web/widget/dist/widget.nomodule.js"
  data-polst="abc123def456"
></script>

<!-- targeted: mounts into an existing element -->
<div id="polst-slot"></div>
<script
  src="https://unpkg.com/@polst-web/widget/dist/widget.nomodule.js"
  data-polst="abc123def456"
  data-target="#polst-slot"
></script>

Programmatic API

For build-tooled consumers (Vite / Webpack / Next.js / etc.):

import { mount, configureOrigins } from "@polst-web/widget";

// Optional: point at a non-prod env before mounting
configureOrigins({
  apiOrigin: "https://staging-api.polst.app",
  appOrigin: "https://staging.polst.app",
});

mount(document.querySelector("#my-target"), {
  polst: "abc123def456",
  theme: "dark",
});

The full programmatic surface is exposed via window.Polst.* after the script loads (mount, configure, renderPolstCard, renderCampaignPlayer, renderBrandFeed, etc.).

Config attributes

| Attribute | Applies to | Type | Notes | | -------------------------- | ------------------- | ------- | ----- | | data-polst | polst marker | string | Polst short id | | data-polst-campaign | campaign marker | string | Campaign id | | data-polst-brand | brand marker | string | Brand slug | | data-target | script-tag only | string | CSS selector; if absent, inserts a sibling div | | data-theme | any | enum | "light", "dark", or "auto" | | data-accent | any | string | 6-char hex color override (no #) | | data-hide-title | any | boolean | Hide the widget title | | data-hide-brand | any | boolean | Hide the "by <brand>" line | | data-auto-advance | campaign | boolean | Auto-advance campaign steps after a vote | | data-mode | brand | enum | "polsts", "campaigns", or "mixed" | | data-on-vote | any | string | Name of a function on window to call on vote | | data-on-complete | campaign | string | Name of a function on window to call on completion | | data-polst-auto-observe | <html> or <body>| presence| Install a MutationObserver to hydrate late-added markers |

Boolean attributes accept "", "true", "1", "yes" (truthy) or "false", "0", "no" (falsy). Unknown callback names are logged with the [polst] prefix and silently dropped — they never throw into the host page.

SPA / dynamic content

For pages that insert markers after initial load, add data-polst-auto-observe to <html> or <body>:

<html data-polst-auto-observe>
  …
</html>

This installs a single MutationObserver that hydrates marker elements as they appear. Each hydrated container is stamped with data-polst-hydrated="1", so re-running the script is always a no-op.

Build outputs

  • dist/widget.esm.js + map — ES2020 module for modern browsers (~19 KB gzipped)
  • dist/widget.nomodule.js + map — ES5 IIFE bundle for nomodule tags (~20 KB gzipped)
  • dist/widget.d.ts — TypeScript declarations
  • dist/integrity.json — SRI hashes for the JS artifacts