Comments on: XPath for CSS classes

By: Peter

Peter — Wed, 04 May 2011 20:09:26 +0000

@Akshay Raje, positional selectors are perfectly possible (and even more concise) in XPath, your example would be tr[4] (since the :eq(n) is zero-based, and XPath's one-based).

By: Akshay Raje

Akshay Raje — Wed, 04 May 2011 19:57:55 +0000

What about selectors like tr:eq(3) ?

By: Sebastien

Sebastien — Wed, 12 Aug 2009 20:48:11 +0000

Thanks Peter. I double-checked, and you are right, that tool was not designed to handle more than one class specifier. I updated it to match your advice, but using a boolean operator. //p[contains(concat(" ",@class," "),concat(" ","sb-fs"," ")) and contains(concat(" ",@class," "),concat(" ","bar"," "))]

By: Peter

Peter — Wed, 12 Aug 2009 20:27:07 +0000

Hi Sebastien, it appears that the tool you're using to convert from CSS selector to XPath query does not like multiple class names. If you look in the middle of the XPath there is an asterisk (*) which should not be there. As a result the corrected XPath should be: //p[contains(concat(" ",@class," "),concat(" ","sb-fs"," "))][contains(concat(" ",@class," "),concat(" ","bar"," "))]

By: Sebastien

Sebastien — Wed, 12 Aug 2009 20:17:43 +0000

Hi. Thanks for the pointer. Emogrifier looks pretty handy. I was wondering if you could give me a hint about the problem below... The following CSS rule: p.sb-fs.bar is converted by emogrifier into the following XPath expression: //p[contains(concat(" ",@class," "),concat(" ","sb-fs"," "))]*[contains(concat(" ",@class," "),concat(" ","bar"," "))] Which seems to completely puzzle PHP's DOMXpath, resulting in no match: Warning: DOMXPath::query() [domxpath.query]: Invalid expression Thanks!