Question 1

How do I extract the href attribute from links using goq?

Accepted Answer

Use a struct tag with a CSS selector and the [href] value selector, e.g., `Links []string `goquery:"a,[href]"``. This maps all anchor tags' href attributes to a slice, and you can combine it with text or other selectors for more control.

Question 2

What's the difference between goq and colly for Go web scraping?

Accepted Answer

goq focuses on declarative HTML unmarshaling into structs using CSS selectors, ideal for type-safe data extraction. Colly is a full-featured scraping framework with request management, parallelism, and callbacks, better suited for complex scraping workflows beyond parsing.

Question 3

Can goq parse HTML that requires JavaScript execution?

Accepted Answer

No, goq relies on static HTML parsing via goquery and cannot execute JavaScript. For JavaScript-rendered content, you need to pre-process the HTML with tools like headless browsers or services before passing it to goq.

Question 4

How to handle nested tables with goq struct tags?

Accepted Answer

Define nested structs with appropriate CSS selectors in tags. For example, map a table to a slice of structs where each struct represents a row, using selectors like `goquery:"table tr"` and nested fields for cells, ensuring correct value selectors for text or attributes.

Question 5

Is goq faster than manual parsing with goquery?

Accepted Answer

goq adds overhead due to reflection and struct mapping, so for simple, one-off parsing, manual goquery might be faster. However, for repeated parsing with complex structures, goq's declarative approach can improve maintainability and reduce error-prone code.

Question 6

How to implement a custom unmarshaler in goq?

Accepted Answer

Implement the Unmarshaler interface by defining an UnmarshalHTML method that takes []*html.Node. This allows full control over parsing logic, useful for cases where standard selectors aren't sufficient, such as complex data transformations.

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