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removing nodes from Nokogiri::XML::NodeSet

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  removing nodes from Nokogiri::XML::NodeSet Ted Flethuseo <flethuseo@gmail.com> - 2011-04-13 19:06 -0500
    Re: removing nodes from Nokogiri::XML::NodeSet Mike Dalessio <mike.dalessio@gmail.com> - 2011-04-13 22:02 -0500
      Re: removing nodes from Nokogiri::XML::NodeSet Ted Flethuseo <flethuseo@gmail.com> - 2011-04-14 08:31 -0500
        Re: removing nodes from Nokogiri::XML::NodeSet Robert Klemme <shortcutter@googlemail.com> - 2011-04-14 09:40 -0500
    Re: removing nodes from Nokogiri::XML::NodeSet 7stud -- <bbxx789_05ss@yahoo.com> - 2011-04-14 12:34 -0500

#2800 — removing nodes from Nokogiri::XML::NodeSet

Hi everyone,

I am having trouble removing a node from a Nokogiri::XML::NodeSet, not
sure what
I should use to remove a specific node at a given position.

I have tried the following but it doesn't seem to work:

puts nodes.length
nodes[0].remove
puts nodes.length


Ted

-- 
Posted via http://www.ruby-forum.com/.

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#2816

[Note:  parts of this message were removed to make it a legal post.]

Greetings,

On Wed, Apr 13, 2011 at 8:06 PM, Ted Flethuseo <flethuseo@gmail.com> wrote:

> Hi everyone,
>
> I am having trouble removing a node from a Nokogiri::XML::NodeSet, not
> sure what
> I should use to remove a specific node at a given position.
>

Nokogiri's NodeSet implements Enumerable, and much of the Array interface,
so you should be able to treat it much like you'd treat any Ruby Array.

For example, to remove the first node in a NodeSet, simply use
`nodes.shift`. To remove the last node, use `nodes.pop`. Etc.


> I have tried the following but it doesn't seem to work:
>
> puts nodes.length
> nodes[0].remove
>

Just a note, that the above code removes the first node in the NodeSet from
its document. Not what you want.

Best of luck.

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#2844

It doesn't remove it though. I also don't want specifically to remove 
the first or last node, often I want to remove one somewhere in the 
middle of the array.

puts nodes.length
nodes[0].remove
puts nodes.length

when I run that code I have originally 4 nodes, and after, I still have 
4 nodes. I found a way to do this but I disklike it, because it has to 
search for the node every time it needs to erase it.

puts nodes.length
nodes.delete(nodes[0])
puts nodes.length

Ted


Mike Dalessio wrote in post #992653:
> Greetings,
>
> On Wed, Apr 13, 2011 at 8:06 PM, Ted Flethuseo <flethuseo@gmail.com>
> wrote:
>
>> Hi everyone,
>>
>> I am having trouble removing a node from a Nokogiri::XML::NodeSet, not
>> sure what
>> I should use to remove a specific node at a given position.
>>
>
> Nokogiri's NodeSet implements Enumerable, and much of the Array
> interface,
> so you should be able to treat it much like you'd treat any Ruby Array.
>
> For example, to remove the first node in a NodeSet, simply use
> `nodes.shift`. To remove the last node, use `nodes.pop`. Etc.
>
>
>> I have tried the following but it doesn't seem to work:
>>
>> puts nodes.length
>> nodes[0].remove
>>
>
> Just a note, that the above code removes the first node in the NodeSet
> from
> its document. Not what you want.
>
> Best of luck.

-- 
Posted via http://www.ruby-forum.com/.

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#2847

On Thu, Apr 14, 2011 at 3:31 PM, Ted Flethuseo <flethuseo@gmail.com> wrote:
> It doesn't remove it though. I also don't want specifically to remove
> the first or last node, often I want to remove one somewhere in the
> middle of the array.
>
> puts nodes.length
> nodes[0].remove
> puts nodes.length
>
> when I run that code I have originally 4 nodes, and after, I still have
> 4 nodes. I found a way to do this but I disklike it, because it has to
> search for the node every time it needs to erase it.
>
> puts nodes.length
> nodes.delete(nodes[0])
> puts nodes.length

You want method #remove:

irb(main):006:0> doc =
Nokogiri::XML("<root><test>1</test><test>2</test></root>")
=> #<Nokogiri::XML::Document:0x832a9b2 name="document"
children=[#<Nokogiri::XML::Element:0x832a728 name="root"
children=[#<Nokogiri::XML::Element:0x8328c20 name="test"
children=[#<Nokogiri::XML::Text:0x8328a9a "1">]>,
#<Nokogiri::XML::Element:0x8328914 name="test"
children=[#<Nokogiri::XML::Text:0x832878e "2">]>]>]>
irb(main):007:0> puts doc
<?xml version="1.0"?>
<root>
  <test>1</test>
  <test>2</test>
</root>
=> nil
irb(main):008:0> doc.xpath('//test')
=> [#<Nokogiri::XML::Element:0x8328c20 name="test"
children=[#<Nokogiri::XML::Text:0x8328a9a "1">]>,
#<Nokogiri::XML::Element:0x8328914 name="test"
children=[#<Nokogiri::XML::Text:0x832878e "2">]>]
irb(main):009:0> doc.xpath('//test[last()]')
=> [#<Nokogiri::XML::Element:0x8328914 name="test"
children=[#<Nokogiri::XML::Text:0x832878e "2">]>]
irb(main):010:0> doc.xpath('//test[last()]').remove
=> [#<Nokogiri::XML::Element:0x8328914 name="test"
children=[#<Nokogiri::XML::Text:0x832878e "2">]>]
irb(main):011:0> puts doc
<?xml version="1.0"?>
<root>
  <test>1</test>
</root>
=> nil

Kind regards

robert


-- 
remember.guy do |as, often| as.you_can - without end
http://blog.rubybestpractices.com/

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#2861

Ted Flethuseo wrote in post #992628:
> Hi everyone,
>
> I am having trouble removing a node from a Nokogiri::XML::NodeSet, not
> sure what
> I should use to remove a specific node at a given position.
>
> I have tried the following but it doesn't seem to work:
>
> puts nodes.length
> nodes[0].remove
> puts nodes.length
>
>
> Ted

Consider this example:


str = "hello \n world"
arr = str.split " "
p arr

--output:--
["hello", "world"]

str.delete!(arr[0])
puts str
puts arr.length

-- 
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