Question 1

How does htmlquery compare to goquery for web scraping in Go?

Accepted Answer

htmlquery uses XPath for queries, which is powerful for complex expressions and evaluations, while goquery uses CSS selectors, often simpler for beginners. htmlquery's caching can improve performance for repeated queries, but goquery has a larger community and more resources.

Question 2

How to install and use htmlquery to scrape a website?

Accepted Answer

Install via go get github.com/antchfx/htmlquery, then use htmlquery.LoadURL to fetch HTML and methods like Find or QueryAll with XPath expressions. For example, to extract links, query with '//a' and iterate through nodes.

Question 3

Can htmlquery handle pages with JavaScript-rendered content?

Accepted Answer

No, htmlquery only parses static HTML. For JavaScript-heavy sites, you need to pre-render the HTML using tools like headless browsers or services before passing it to htmlquery for querying.

Question 4

What are the performance benefits of enabling cache in htmlquery?

Accepted Answer

Enabling cache avoids re-compiling XPath expressions, drastically reducing query time. Benchmarks in the README show cache-enabled queries at 55.2 ns/op versus 3162 ns/op when disabled, making it ideal for repetitive scraping.

Question 5

Is htmlquery thread-safe for concurrent use in Goroutines?

Accepted Answer

The README doesn't specify concurrency safety. While basic parsing might be safe, the caching mechanism could require synchronization if sharing query objects across goroutines, so it's best to test or use mutexes in concurrent scenarios.

Question 6

How to extract specific attributes like href from elements with htmlquery?

Accepted Answer

Use XPath expressions like '//a/@href' with Find or QueryAll, then loop through nodes and call htmlquery.InnerText(n) to get attribute values, as demonstrated in the code examples for extracting href and src attributes.

Question 7

Does htmlquery support all XPath 2.0 features without limitations?

Accepted Answer

It relies on the antchfx/xpath package for XPath 1.0/2.0 support, but for advanced 2.0 functions, you should check that package's documentation, as there might be edge cases or unimplemented features in practice.

htmlquery

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