Extract background-image from an HTML element in r

问题:

I am trying to extract background-url from a div using Nokogiri but am not able parse background-url of it.

While Searching on StackOverflow I found this link
Parsing: Can I pick up the URL of embedded CSS Background in Nokogiri?
but the solution given there doesn't work.

回答1:

Nokogiri is not a web browser. It stands on top of libxml2 to provide fast and excellent parsing of XML and HTML, and manipulation and extraction of data from this.

It only deals with the HTML in a web page. It does not run any JavaScript. It does not apply CSS to the DOM. There is no way to use Nokogiri to find a CSS style applied to an element unless it is directly on the style="..." attribute on that element. (And even then you would need to use something else, like regex, to parse the CSS therein.)

You will want to use something else, like a headless browser controlled by Ruby, e.g. Watir or Selenium, if you want to process a web page and treat it like a web browser does.