difficulty filtering with a default namespace

[jennybc]

I can use an XPath query in the Console that xmlview tells me is invalid. In general, I can't use the xml_view XPath filter in the presence of a default namespace, i.e. when I need to do d1:foo.

library(xml2)
library(xmlview)
x <- read_xml('
  <root xmlns = "http://foo.com">
    <si>
      <t>country</t>
    </si>
    <si>
      <t>continent</t>
    </si>
  </root>
  ')
xml_find_all(x, "//d1:t", xml_ns(x))
#> {xml_nodeset (2)}
#> [1] <t>country</t>
#> [2] <t>continent</t>
#xml_view(x, add_filter = TRUE)

[hrbrmstr]

(I was wondering when someone wld hit this :-)

thx for filing the bug and i'll tag it as such when not on mobile and see
how hard it will be to do the xml2 default namespace code gen (shldn't be
bad)

On Thu, May 19, 2016 at 6:41 PM, Jennifer (Jenny) Bryan <
notifications@github.com> wrote:

I can use an XPath query in the Console that xmlview tells me is invalid.
In general, I can't use the xmview XPath filter in the presence of a
default namespace, i.e. when I need to do d1:foo.

library(xml2)
library(xmlview)x <- read_xml(' country continent ')
xml_find_all(x, "//d1:t", xml_ns(x))#> {xml_nodeset (2)}#> [1] country#> [2] continent#xml_view(x, add_filter = TRUE)

[image: screen shot 2016-05-19 at 3 08 09 pm]
https://cloud.githubusercontent.com/assets/599454/15411252/8bc91b84-1dd3-11e6-8530-ce36a8a1c04a.png

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#10

[jennybc]

The thing is ... it looks like it's already there! I tried to figure this out for myself before opening this.

Here's where it feels like you've already handled this:

xmlview/inst/htmlwidgets/xmlview.js

Lines 84 to 91 in 4e93801

	self.rcode.innerText = "xml2::xml_find_all(" +
	self.glob.xmlDocName + ", '" +
	self.xpath.value + "', ns=xml2::xml_ns(" +
	self.glob.xmlDocName + "))";
	self.rcode.textContent = "xml2::xml_find_all(" +
	self.glob.xmlDocName + ", '" +
	self.xpath.value + "', ns=xml2::xml_ns(" +
	self.glob.xmlDocName + "))";

[jennybc]

Oh. I think that's just for the helpful R code you provide if user likes the XPath result, but it's not the business end of the filtering. It seems the actual filtering is happening on the js side and I don't know how to fix namespace resolution there 😔.