Amazon Store Router

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CDN:
https://cdn.davecross.co.uk/js/amazon-store/v1/amazon-store.min.js (rolling major)
https://cdn.davecross.co.uk/js/amazon-store/v1.2.0/amazon-store.min.js (pinned)

GitHub release (latest SemVer)

A tiny, dependency‑free helper to route Amazon links to the viewer’s local store and add your Associate tag. Works in any static site. Ship it from your own CDN.

No external trackers. Uses browser signals first (navigator.languages, time zone), then falls back to <html lang> and hostname TLD. (v1.2.0)
Deterministic. You can force a region per link or globally.
Progressive enhancement. Plain links still work without JS.
UMD + ESM builds. Versioned folders for long‑term caching.
From v1.1.0: built‑in renderer for a “More stores” grid.
From v1.2.0: safer enhancement for image links and data-amazon-mode="link|button|auto".

Quick start

UMD (global) — easiest

<script src="https://cdn.davecross.co.uk/js/amazon-store/v1/amazon-store.min.js" defer></script>
<script>
  document.addEventListener('DOMContentLoaded', () => {
    // Upgrade all elements with data attributes:
    AmazonStore.enhanceAll({ tag: 'davblog-21' });

    // (Optional) render any “More stores” grids
    AmazonStore.renderStoreGridAll({ tag: 'davblog-21' });
  });
</script>

Markup for a button:

<a class="btn btn-primary"
   data-amazon-asin="B0DJRYGFKM"
   data-amazon-text="Buy on Amazon"> </a>

ESM (modern browsers)

Pinned version (reproducible):

<script type="module">
  import { enhanceAll, renderStoreGridAll } from 'https://cdn.davecross.co.uk/js/amazon-store/v1.2.0/amazon-store.esm.js';
  enhanceAll({ tag: 'davblog-21' });
  renderStoreGridAll({ tag: 'davblog-21' });
</script>

Or follow the moving pointer (latest v1.x):

<script type="module">
  import { enhanceAll, renderStoreGridAll } from 'https://cdn.davecross.co.uk/js/amazon-store/v1/amazon-store.esm.js';
  enhanceAll({ tag: 'davblog-21' });
  renderStoreGridAll({ tag: 'davblog-21' });
</script>

Data attributes

For buttons/links you want auto‑wired:

data-amazon-asin="ASIN" — preferred (uses /dp/ASIN)
data-amazon-search="search terms" — alternative when ASIN differs by store

Optional per‑element overrides:

data-amazon-tag="davblog-21"
data-amazon-region="DE" — force a store for this element
data-amazon-params="ref=foo&bar=baz" — extra query parameters
data-amazon-path="gp/product" — use a different path than /dp
data-amazon-text="Buy now" — fixed text; omit to auto‑label with the store name
data-amazon-mode="link|button|auto" — (v1.2.0) how to treat the element:
- auto (default): update href/rel/target; only set text if the element is empty and data-amazon-text is present.
- link: never touch inner HTML (perfect for image links).
- button: may set the label from data-amazon-text if the element is empty.

Example — image link (preserve the image)

<a class="cover-link"
   data-amazon-asin="1529922933"
   data-amazon-mode="link">
  <img src="…" alt="Cover of …">
</a>

“More stores” grid (v1.1.0+)

HTML:

<details class="more-stores">
  <summary>More stores</summary>
  <div class="store-grid"
       data-amazon-grid
       data-amazon-asin="B09VPLGMBN"></div>
</details>

JS (already shown in Quick start):

AmazonStore.renderStoreGridAll({ tag: 'davblog-21' });

Optional grid attributes:

data-amazon-search="Book Title by Author" — use search instead of a fixed ASIN
data-amazon-regions="UK,US,DE,FR" — whitelist stores to show
data-amazon-current-first="false" — disable “your region first”
data-amazon-link-class="store-pill" — class to apply to each link
data-amazon-new-tab="false" — open links in the same tab

API

detectRegion(opts?) -> "UK" | "US" | "DE" | ...   // browser‑first (navigator → timeZone → html → TLD → fallback)
label(region) -> "Amazon UK"
url(asin, opts) -> string             // builds a store URL (supports search fallback)
enhance(elOrSelector, asin, opts)     // wire up a single element
enhanceAll(defaults)                  // wire up all matching elements

renderStoreGrid(elOrSelector, opts)   // build a “More stores” grid
renderStoreGridAll(defaults)          // build all grids on the page

opts:

{
  region?: "UK" | "US" | "DE" | ...,  // force region (optional)
  defaultRegion?: "UK" | "US" | ...,  // fallback only if undetectable
  tag?: string,
  path?: string,                      // default 'dp'
  params?: Record<string,string>,
  search?: string,                    // if set (and ASIN omitted), use /s?k=...
  // grids:
  currentFirst?: boolean, regions?: string[] | CSV, linkClass?: string, newTab?: boolean,
  // enhance:
  mode?: "link" | "button" | "auto", text?: string
}

Versioning & CDN

Versioned builds live under amazon-store/vX.Y.Z/ (e.g., v1.2.0/).
Convenience pointer amazon-store/v1/ always points to the latest 1.x:
- amazon-store/v1/amazon-store.min.js (UMD)
- amazon-store/v1/amazon-store.esm.js (ESM)
Cache versioned files forever (max-age=31536000, immutable). Cache the /v1/ pointer more briefly and invalidate on release.

SRI (optional)

Generate a Subresource Integrity hash:

openssl dgst -sha384 -binary amazon-store.min.js | openssl base64 -A

Include:

<script src="…/amazon-store.min.js"
        integrity="sha384-…"
        crossorigin="anonymous" defer></script>

Licence

MIT

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