// ==UserScript==
// @name Amazon Filter: Sold by Amazon.com
// @namespace https://github.com/sinazadeh/userscripts
// @version 2.2.0
// @description Enhances Amazon's sidebar by adding direct filters for items sold by Amazon.com and other Amazon-owned sellers.
// @author TheSina
// @match *://www.amazon.com/s*
// @match *://www.amazon.com/*/b/*
// @match *://www.amazon.com/b/*
// @grant none
// @run-at document-end
// @license MIT
// ==/UserScript==
/* jshint esversion: 11 */
(function () {
'use strict';
// --- Configuration ---
const ID_MAP = {
Amazon: 'A2Q1LRYTXHYQ2K',
'Amazon.com': 'ATVPDKIKX0DER',
'Amazon Resale': 'A2L77EE7U53NWQ',
'Amazon.com Services LLC': 'A3ODHND3J0WMC8',
};
const REVERSE_ID_MAP = Object.fromEntries(
Object.entries(ID_MAP).map(([key, value]) => [value, key]),
);
const OPTIONS = Object.keys(ID_MAP);
// --- State Management ---
const state = {
selectedFilters: [],
currentUrl: '',
observer: null,
uiInitialized: false,
};
// --- Core Logic ---
function applyFilters() {
const baseUrl = isOnCategoryPage()
? buildSearchUrlFromCategory()
: location.href;
const url = new URL(baseUrl);
const params = url.searchParams;
const otherRhParams = (params.get('rh') || '')
.split(',')
.filter(p => p && !p.startsWith('p_6:'));
if (state.selectedFilters.length > 0) {
const sellerIds = state.selectedFilters
.map(label => ID_MAP[label])
.join('%7C');
otherRhParams.push(`p_6:${sellerIds}`);
params.set('rh', otherRhParams.join(','));
} else {
if (otherRhParams.length > 0) {
params.set('rh', otherRhParams.join(','));
} else {
params.delete('rh');
}
}
if (url.href !== location.href) {
window.location.href = url.href;
}
}
function initializeStateFromURL() {
const url = new URL(location.href);
const rh = url.searchParams.get('rh') || '';
const sellerFilter = rh.split(',').find(p => p.startsWith('p_6:'));
if (sellerFilter) {
const sellerIds = sellerFilter.substring(4).split(/\||%7C/);
state.selectedFilters = sellerIds
.map(id => REVERSE_ID_MAP[id])
.filter(Boolean);
} else {
state.selectedFilters = [];
}
state.currentUrl = location.href;
state.uiInitialized = false;
}
// --- UI Creation ---
function createUI() {
if (state.uiInitialized) return;
const sidebar = findSidebar();
if (sidebar) {
const filterContainer =
sidebar.querySelector('#filter-p_6') || sidebar;
buildNativeUI(filterContainer);
} else if (isOnCategoryPage()) {
createFloatingWidget();
}
}
function buildNativeUI(container) {
OPTIONS.forEach(label =>
document.getElementById(`p_6/${ID_MAP[label]}`)?.remove(),
);
const fragment = document.createDocumentFragment();
OPTIONS.slice().forEach(label => {
fragment.appendChild(createCheckboxListItem(label));
});
container.prepend(fragment);
const sellerBlock = container.closest('div[id*="p_6"]');
sellerBlock?.parentElement?.prepend(sellerBlock);
updateCheckboxes();
state.uiInitialized = true;
}
function createFloatingWidget() {
document.getElementById('amazon-seller-filter-widget')?.remove();
const widget = document.createElement('div');
widget.id = 'amazon-seller-filter-widget';
Object.assign(widget.style, {
position: 'fixed',
top: '80px',
right: '20px',
background: 'white',
border: '1px solid #ddd',
borderRadius: '4px',
padding: '15px',
boxShadow: '0 2px 8px rgba(0,0,0,0.15)',
zIndex: '1001',
fontFamily: 'Amazon Ember, Arial, sans-serif',
fontSize: '14px',
});
widget.innerHTML = `<h3 style="margin: 0 0 10px; font-size: 16px; font-weight: bold;">Filter by Seller</h3>`;
const ul = document.createElement('ul');
ul.style.cssText = 'list-style: none; padding: 0; margin: 0;';
OPTIONS.forEach(label =>
ul.appendChild(createCheckboxListItem(label, true)),
);
widget.appendChild(ul);
document.body.appendChild(widget);
updateCheckboxes();
state.uiInitialized = true;
}
function createCheckboxListItem(label, isWidget = false) {
const li = document.createElement('li');
li.id = `p_6/${ID_MAP[label]}`;
if (isWidget) {
li.innerHTML = `
<label style="display: flex; align-items: center; cursor: pointer; margin: 8px 0;">
<input type="checkbox" data-label="${label}" style="margin-right: 8px;">
<span>${label}</span>
</label>`;
} else {
li.className = 'a-list-item a-spacing-micro';
li.innerHTML = `
<a class="a-link-normal s-navigation-item" href="#">
<div class="a-checkbox a-checkbox-fancy s-navigation-checkbox aok-float-left">
<label><input type="checkbox" data-label="${label}"><i class="a-icon a-icon-checkbox"></i></label>
</div>
<span class="a-size-base a-color-base">${label}</span>
</a>`;
}
const checkbox = li.querySelector('input[type=checkbox]');
const clickableArea =
li.querySelector('a') || li.querySelector('label');
const handleChange = e => {
e.preventDefault();
if (e.target !== checkbox) {
checkbox.checked = !checkbox.checked;
}
const idx = state.selectedFilters.indexOf(label);
if (checkbox.checked && idx === -1) {
state.selectedFilters.push(label);
} else if (!checkbox.checked && idx !== -1) {
state.selectedFilters.splice(idx, 1);
}
applyFilters();
};
clickableArea.addEventListener('click', handleChange);
return li;
}
function updateCheckboxes() {
OPTIONS.forEach(label => {
const checkbox = document.querySelector(
`input[data-label="${label}"]`,
);
if (checkbox) {
checkbox.checked = state.selectedFilters.includes(label);
}
});
}
// --- Page Data & Helpers ---
/**
* Correctly identifies category pages, including path /b and /b/
*/
const isOnCategoryPage = () =>
location.pathname === '/b' || location.pathname.startsWith('/b/');
function findSidebar() {
const selectors = [
'#s-refinements',
'#leftNav',
'#departments',
'div[data-csa-c-slot-id="left-nav"]',
];
return (
selectors.map(s => document.querySelector(s)).find(el => el) || null
);
}
/**
* Builds a search URL from a category page, now with better data extraction.
*/
function buildSearchUrlFromCategory() {
const {node, categoryName, searchAlias} = getCategoryPageData();
const params = new URLSearchParams();
// Prefer using the more specific search alias 'i' if found
if (searchAlias) {
params.set('i', searchAlias);
} else {
// Fallback to keyword 'k' if no alias is available
params.set('k', categoryName);
}
// Always include the node in the 'rh' parameter if it exists
if (node) {
params.set('rh', `n:${node}`);
}
return `https://www.amazon.com/s?${params.toString()}`;
}
/**
* Extracts page data, now including the search alias (e.g., 'i=tools').
*/
function getCategoryPageData() {
const node = new URL(location.href).searchParams.get('node');
let categoryName = '';
let searchAlias = '';
// Attempt to get the specific search-alias from the department dropdown
const searchDropdown = document.getElementById('searchDropdownBox');
if (searchDropdown) {
const selectedOption =
searchDropdown.querySelector('option[selected]');
if (selectedOption) {
const aliasValue = selectedOption.value; // e.g., "search-alias=tools"
if (aliasValue.startsWith('search-alias=')) {
searchAlias = aliasValue.split('=')[1];
}
}
}
// Fallback logic to get a display name for the category
const selectors = [
'.sg-col .a-color-state.a-text-bold',
'#wayfinding-breadcrumbs_feature_div .a-link-normal:last-of-type',
'h1, .a-size-large.a-spacing-none.a-color-base',
];
categoryName =
selectors
.map(s =>
document
.querySelector(s)
?.textContent.trim()
.replace(/"/g, ''),
)
.find(name => name) || '';
if (!categoryName) {
const title = document.title;
if (title.includes('Amazon.com')) {
categoryName = title
.split(' - ')[0]
.replace('Amazon.com: ', '')
.trim();
}
}
return {node, categoryName: categoryName || 'Category', searchAlias};
}
// --- Initialization and Observation ---
function handleCategoryPageRedirect() {
// Only redirect on category pages that LACK a standard filter sidebar.
if (isOnCategoryPage() && !findSidebar()) {
const searchUrl = buildSearchUrlFromCategory();
// Use replace to avoid polluting browser history with the redirect.
window.location.replace(searchUrl);
return true; // Indicates a redirect has started.
}
return false;
}
function reinitialize() {
// If the page is a basic category page, redirect to a search page first.
if (handleCategoryPageRedirect()) {
return; // Stop execution to allow the redirect to happen.
}
document.getElementById('amazon-seller-filter-widget')?.remove();
initializeStateFromURL();
createUI();
}
function setupMutationObserver() {
if (state.observer) state.observer.disconnect();
const observerTarget =
document.getElementById('a-page') || document.body;
state.observer = new MutationObserver(mutations => {
if (location.href !== state.currentUrl) {
reinitialize();
return;
}
if (!state.uiInitialized) {
for (const mutation of mutations) {
if (mutation.addedNodes.length > 0) {
createUI();
if (state.uiInitialized) break;
}
}
}
});
state.observer.observe(observerTarget, {
childList: true,
subtree: true,
});
}
// --- Script Entry Point ---
if (document.readyState === 'loading') {
document.addEventListener('DOMContentLoaded', () => {
reinitialize();
setupMutationObserver();
});
} else {
reinitialize();
setupMutationObserver();
}
window.addEventListener('popstate', () => setTimeout(reinitialize, 100));
})();
