Master Web Scraping with Chrome’s Web Scraper: Install, Sitemap & Advanced Pagination
This guide walks you through installing the Chrome Web Scraper extension, explains core concepts like sitemaps and selectors, and demonstrates how to handle both simple and complex pagination as well as secondary page crawling, enabling you to extract structured data from websites without writing code.
1. Install Web Scraper
Search for "Web Scraper" in the Chrome Web Store and install it. If you cannot install directly, download the CRX file from a third‑party site (e.g., https://crxdl.com/) and install it offline. After installation, restart Chrome and open the DevTools (F12) to see the Web Scraper panel.
2. Basic Concepts and Operations
sitemap – a JSON configuration that describes the crawling flow. Each sitemap represents a separate crawling job and can be exported or imported.
Selector – a CSS selector that identifies the element(s) to extract from a page. Each selector extracts one piece of data; multiple selectors are used to collect multiple fields.
Web Scraper uses CSS selectors; you can also click elements in the UI to let the tool generate the selector automatically. Selectors can be nested, allowing recursive crawling of a site.
3. Pagination Scraping
Two pagination patterns exist:
Clicking “Next page” loads a new page.
Clicking “Next page” only re‑renders part of the current page.
Older versions required different selectors: Link selector for full‑page reload pagination. Element Click selector for partial‑render pagination.
Newer versions provide a dedicated Pagination selector that works for both patterns.
Non‑reload pagination
Use an Element Click selector. Ensure you set the root and next_page selectors so the crawler can recurse.
Resulting data can be exported as CSV or XLSX.
Reload pagination
Use the Pagination selector, which follows the next page link even when the page is fully reloaded.
4. Crawling Secondary Pages
To obtain details such as article content, likes, or comments, use a Link selector to open each article page and extract the required fields.
5. Final Thoughts
Mastering pagination and secondary‑page crawling equips you to scrape most structured web data, such as all your CSDN blog posts with titles, URLs, content, view counts, comments, likes, and favorites.
Basic knowledge of CSS selectors and regular expressions is recommended to refine the extracted data.
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