From: Anton Bangratz <tony@...>
Date: 2010-09-12T21:07:27+09:00
Subject: Re: #{}  in xpath

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On 09/12/2010 01:46 PM, Pen Ttt wrote:
> code1
> data=3Ddoc.xpath('.//small//span[@id=3D"yfs_t10_aacc"]')
> puts data.text
>=20
> code2
> str=3D"aacc"
> data=3Ddoc.xpath('.//small//span[@id=3D"yfs_t10_#{str}"]')
> puts data.text
>=20
> code1 can work,code2 can't,would you mind to tell me how to fix it?

Trick is that the string interpolation is not working with single
quotes, but only with double quotes. Compare:


'.//small//span[@id=3D"yfs_t10_#{str}"]'
=3D> ".//small//span[@id=3D\"yfs_t10_\#{str}\"]"

".//small//span[@id=3D\"yfs_t10_#{str}\"]"
=3D> ".//small//span[@id=3D\"yfs_t10_aacc\"]"


Note the necessary escaping of the double quotes.

There's also an alternative percent sign syntax for interpolated strings:=


%{.//small//span[@id=3D"yfs_t10_#{str}"]}
=3D> ".//small//span[@id=3D\"yfs_t10_aacc\"]"


Regards,

t.

PS: Helpful documentation:
http://en.wikibooks.org/wiki/Ruby_Programming/Syntax/Literals
--=20
Anton Bangratz - Key ID 363474D1 - http://tony.twincode.net/
fortune(6):
Remembering is for those who have forgotten.
		-- Chinese proverb


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