Seach by class in Nokogiri nodeset

Tag: ruby,xpath,nokogiri

I got the name of a CSS class from a Nokogiri node. Now I want to find all the nodes that also have the same class attached.

I don't know which HTML tag the element that I'm looking for has, and how deep it is. All i know is what class to search for.

I have already tried:

doc.xpath("//*[contains(@class, #{css})]")

But this seems to return WAY too many elements.

Also I have tried:

doc.xpath("//*[@class, #{css}]")

and this returns nothing.

I want to get the elements that contain that class, not every element that surrounds an element with that class.

Is it possible to do this with Nokogiri?

Best How To :

Assuming that the class name is stored into class_name, I think that

doc.xpath("//*[contains(concat(' ', normalize-space(@class), ' '), ' #{class_name} ')]")

is what you're looking for.

This will match all the elements that contain class_name into their classes, ie if class_name is 'box', then it will match both elements like div class="box" and elements like div class="box left"

If you only want to match elements like div class="box" ie that have only one class and that class is the one you're looking for, then you could use this:

doc.xpath("//*[@class=\"#{class_name}\"]")

Ruby gsub group parameters do not work when preceded by escaped slashes

ruby,regex

You are trying to write a python code using ruby syntax. This is not a best approach to GTD. Slashes are handled right-to-left, yielding not what you expected. As soon as one finds herself putting three or more backslashes inside the string, she should admit, she’s doing it wrong. At...

Can't get value from xpath python

python,html,xpath,web-scraping,html-parsing

The values in the table are generated with the help of javascript being executed in the browser. One option to approach it is to automate a browser via selenium, e.g. a headless PhantomJS: >>> from selenium import webdriver >>> >>> driver = webdriver.PhantomJS() >>> driver.get("http://www.tabele-kalorii.pl/kalorie,Actimel-cytryna-miod-Danone.html") >>> >>> table = driver.find_element_by_xpath(u"//table[tbody/tr/td/h3...

How to pivot array into another array in Ruby

arrays,ruby,csv

Here is a way using an intermediate hash-of-hash The h ends up looking like this {"Alaska"=>{"Rain"=>"3", "Snow"=>"4"}, "Alabama"=>{"Snow"=>"2", "Hail"=>"1"}} myArray = [["Alaska","Rain","3"],["Alaska","Snow","4"],["Alabama","Snow","2"],["Alabama","Hail","1"]] myFields = ["Snow","Rain","Hail"] h = Hash.new{|h, k| h[k] = {}} myArray.each{|i, j, k| h[i][j] = k } p [["State"] + myFields] + h.map{|k, v| [k] + v.values_at(*myFields)} output...

Heroku rake db:migrate failing - uninitialized constant

ruby-on-rails,ruby,heroku

Your migration file named should correspond to AddWeightToExercises. It should be accordingly xxxxxxxx_add_weight_to_exercises, where xxxxxxx corresponds to a particular timestamp.

Error when building an XDocument

c#,xml,linq,xpath,linq-to-xml

You can ignore pretty much all your code, the issue is just this: XDocument people = new XDocument("Persons"); You can't create an XDocument containing a string, you need to add an element: XDocument people = new XDocument( new XElement("Persons", original.XPathSelectElements(xpathFilterDups))); ...

XSL transformation outputting multiple times and other confusion

xml,xslt,xpath

1) Your template is applied to 3 elements, and for each of them, loops over all the parents li elements (yes, for each of them, ask all the li elements, children of the grand-father of the current content, which are all the 3 li elements, each time). 2) Because that's...

Can't map a range of dates in Ruby/Rails

ruby-on-rails,ruby

You can try : dateLabels = <%= raw @mapped_dates.as_json %>; This will return ["Jan 1", "Jan 2", "Jan 3", ... ] For ActiveSupport::TimeWithZone problem, please do - In config/initializers/time_zone.rb class ActiveSupport::TimeWithZone def as_json(options = {}) if ActiveSupport::JSON::Encoding.use_standard_json_time_format xmlschema else %(#{time.strftime("%Y/%m/%d %H:%M:%S")} #{formatted_offset(false)}) end end end ...

Unable to construct Document object from xml string

java,xml,xpath,xml-parsing

As Arthur Elrich pointed out in the comments, you should make the factory namespace aware and provide a namespace context to the XPath instance. DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance(); factory.setNamespaceAware(true); DocumentBuilder builder = factory.newDocumentBuilder(); Document document = builder.parse( new InputSource(new StringReader(...))); XPath xpath = XPathFactory.newInstance().newXPath(); xpath.setNamespaceContext(new MyNamespaceContext()); String s = xpath.evaluate("//location:address/text()",...

Get the actual value of a boolean attribute

ruby,page-object-gem,rspec3,rspec-expectations

The Page-Object gem's attribute method does not do any formatting of the attribute value. It simply returns what is returned from Selenium-WebDriver (or Watir-Webdriver). In the case of boolean attributes, this means that true or false will be returned. From the Selenium-WebDriver#attribute documentation: The following are deemed to be “boolean”...

Rails - link_to path based on object's name + refactoring multiple custom actions

ruby-on-rails,ruby,refactoring

You can change your routes : resources :techs, :only => [:index, :show], shallow: true do resources :cars, only: [:new, :create] collection do get 'part/:part_name' => "techs#part", as: :part end end Then add the action : def part @techs = Tech.joins(:services).where(services: { name: params[:part_name]}) end and the view will be :...

webdriver C# - click this element with XPath position?

c#,selenium,xpath,webdriver

Shouldn't you be using: river.FindElement(By.XPath("//td[4]/a")).Click(); ? And if you have similiar Problems. You can use the Console in the developer tools of Chrome and write like this: $x("YOUR XPATH HERE") This will result in your element. If that's not the case, then your Xpath is wrong. Edit: If you want...

Rails less url path change

ruby-on-rails,ruby,url,path,less

You should use the font_url, and put the font in app/assets/fonts @font-face { font-family: 'SomeFont'; src: font_url("db92e416-da16-4ae2-a4c9-378dc24b7952.eot?#iefix"); //... } ...

On rendering from controller, current_page method does not seem to work

ruby-on-rails,ruby,ruby-on-rails-4,model-view-controller

You can use content_for and yields to create a default in your layout which views can override. # layouts/application.html.erb: <% if content_for?(:banner) %> <%= yield(:banner) %> <% else %> <div id="banner"> <h1>This is the default...</h1> </div> <% end %> /users/signup.html.erb: <%- content_for :banner, flush: true do -%> <!-- move along,...

Java XPath returns single result instead of NodeSet

java,xml,dom,xpath

My guess is that you make a mistake while processing the result NodeList. Try the following approach: NodeList results = (NodeList) xpath.evaluate(..); for (int i = 0; i < nodelist.getLength(); i++) { Node node = (Node) nodelist.item(i); ... } ...

Ruby on Rails - Help Adding Badges to Application

ruby-on-rails,ruby,rest,activerecord,one-to-many

Take a look at merit gem. Even if you want to develop your own badge system from scratch this gem contains plenty of nice solutions you can use. https://github.com/merit-gem/merit

XPath for child element

selenium,xpath

//div[contains(concat(' ',@class,' '), ' A ')]//div[contains(concat(' ',@class,' '), ' B ')][1] ...

Make instance variable accessible through hash in Ruby

ruby-on-rails,ruby,ruby-on-rails-4,activerecord

It's not "through Hash", it's "array access" operator. To implement it, you need to define methods: def [](*keys) # Define here end def []=(*keys, value) # Define here end Of course, if you won't be using multiple keys to access an element, you're fine with using just key instead of...

edit first line of multiple files in place with a ruby one-liner

ruby

This code will work: ruby -pi -e 'sub(/^/,"New line goes at top\n") if $FILENAME != $F;$F = $FILENAME' file* ...

How to handle backslash “\” escape characters in q string and heredocument

ruby

str = <<'TEXT' hello %s \\\hline %s TEXT name = "Graig" msg = "Goodbye" puts str % [name, msg] The heredoc does not have escape chars when it's delimiter is in single quotes. It does have a form of interpolation. The code above has this output: hello Graig \\\hline Goodbye...

Ruby boolean logic: some amount of variables are true

ruby

[a, b, c].count(true) < 2 ........................

Allowing some enabled and disabled option on collection_select

ruby-on-rails,ruby

collection_select internally relies on options_from_collection_for_select helper. Rather than using the collection_select directly, you can use select and pass the result of a options_from_collection_for_select call. The reason you may want to call options_from_collection_for_select directly, is because this method also accepts an optional selected parameter that could be used to pass a...

What is Rack::Utils.multipart_part_limit within Rails and what function does it perform?

ruby-on-rails,ruby,rack,multipart

Telling it short, this value limits the amount of simultaneously opened files for multipart requests. To understand better what is multipart, you can see this question. The reason for this limitation is an ability to better adjust your app for your server. If you have too many files opened at...

Using Ruby Pathname to access relative directory

ruby,path,pathname

You need add another level like p = Pathname.new('dir/.') now the directory name is "dir"...

Same enum values for multiple columns

ruby-on-rails,ruby,enums

Maybe it makes extract the planet as another model? def Planet enum type: %w(earth mars jupiter) end class PlanetEdge < ActiveRecord::Base belongs_to :first_planet, class_name: 'Planet' belongs_to :second_planet, class_name: 'Planet' end You can create a PlanetEdge by using accepts_nested_attributes_for: class PlanetEdge < ActiveRecord::Base belongs_to :first_planet, class_name: 'Planet' belongs_to :second_planet, class_name: 'Planet'...

Loop until i get correct user

ruby,redis

Change if to while: while ["user_4", "user_5"].include?(@randUser = @redis.spop("users")) do @redis.sadd("users", @randUser) end $user_username = @redis.hget(@randUser, "username") $user_password = @redis.hget(@randUser, "password") Please note, that you actually mixed up receiver and parameters on Array#include?...

is there an equivalent of the ruby any method in javascript?

javascript,arrays,ruby,iteration

You are looking for the Array.prototype.some method: var match = arr.some(function(w) { return w.indexOf('z') > -1; }); ...

Heroku RAM not increasing with upgraded dynos

ruby-on-rails,ruby,ruby-on-rails-3,memory,heroku

That log excert is from a one off dyno, a la heroku run console - this is entirely seperate to your web dynos which you may be runnning 2x dyno's for. You need to specifiy --size=2x in your heroku run command to have the one off process use 2x dynos.

Rails basic auth not working properly

ruby-on-rails,ruby,authentication

@user.keys.each do |key| username == key.api_id && password == key.api_key end This piece of code returns a value of .each, which is the collection it's called on (@user.keys in this case). As it is a truthy value, the check will pass always, regardless of what are the results of evaluating...

Stack level too deep because recursion

ruby-on-rails,ruby,ruby-on-rails-4,twitter

If you express the relation properly, ActiveRecord will do it for you class Tweet belongs_to :original_tweet, class_name: Tweet has_many :retweets, class_name: Tweet, dependent: :destroy, inverse_of :original_tweet end Tweet.last.destroy # will now destroy dependents ...

Map with accumulator on an array

ruby,inject

This operation is called scan or prefix_sum, but unfortunately, there is no implementation in the Ruby core library or standard libraries. However, your intuition is correct: you can implement it using Enumerable#inject. (Actually, Enumerable#inject is general, every iteration operation can be implemented using inject!) module Enumerable def scan(initial) inject([initial]) {|acc,...

Keep leading zeroes when converting string to integer

ruby

Short answer: no, you cant. 2.1.5 :001 > 0001 => 1 0001 doesn't make sense at all as Integer. In the Integer world, 0001 is exactly as 1. Moreover, the number of leading integer is generally irrelevant, unless you need to pad some integer for displaying, but in this case...

Ruby: How to copy the multidimensional array in new array?

ruby-on-rails,arrays,ruby,multidimensional-array

dup does not create a deep copy, it copies only the outermost object. From that docs: Produces a shallow copy of obj—the instance variables of obj are copied, but not the objects they reference. dup copies the tainted state of obj. If you are not sure how deep your object...

Split an array into slices, with groupings

arrays,ruby,enumerable

Yes, this bookkeeping with i is usually a sign there should be something better. I came up with: ar =[ { name: "foo1", location: "new york" }, { name: "foo2", location: "new york" }, { name: "foo3", location: "new york" }, { name: "bar1", location: "new york" }, { name:...

group siblings by identifying the first node of a certain type in sequence

xml,xslt,xpath

Try it this way: <xsl:key name="kFirstText" match="*[not(self::type1[not(preceding-sibling::*[1][self::type1])])]" use="generate-id(preceding-sibling::type1[not(preceding-sibling::*[1][self::type1])][1])"/> This excludes the "leader" nodes from the group retrieved by the key....

How could I padding spaces to a fix length

ruby

You should use ljust: arr = [477, 4770] strings = arr.map { |number| number.to_s.ljust(5) } # => ["477 ", "4770 "] Good luck!...

For loop with flexible stop variable

ruby

Normally we'd use a loop do with a guard clause: x = 1 loop do break if x >= y x += 1 ... end Make sure y is larger than x or it'll never do anything. y can change if necessary and as long as it's greater than x...

Rails Association Guidance [on hold]

ruby-on-rails,ruby,ruby-on-rails-4,ruby-on-rails-3.2

So, the complex part of your situation is that you have one thing (Surgery) that can be of many different types, and the different types have different fields. There are a number of different approaches to this problem, and I don't believe there's wide consensus on the 'best way'. The...

xpath query seem to be failing

xml,xpath

$str = '<root><Pages> <copyright>me inc. 2015,</copyright> <author>Me</author> <lastUpdate>2/1/1999</lastUpdate> <Home>--------------------</Home> <About>--------------------</About> <Contact>------------------</Contact> </Pages></root>'; $xml = simplexml_load_string($str); $result = $xml->xpath('//Pages/*[(name() = "Home") or following-sibling::Home]'); if ($result === false) { $this->parseError(); //To return xml Error code...

regex to pull in number with decimal or comma

ruby,regex

\d+(?:[,.]\d+)? Try this.This should do it for you....

In Ruby how to put multiple lines in one guard clause?

ruby-on-rails,ruby

Don't know what the surrounding code looks like so let's assume your code is the entire body of a method. Then a guard clause might look like this: def some_method return if params[:"available_#{district.id}"] != 'true' @deliverycharge = @product.deliverycharges.create!(districtrate_id: district.id) delivery_custom_price(district) end ...

Rails shared controller actions

ruby-on-rails,ruby,ruby-on-rails-4

You should pass actions to the included block and perform_search_on to the class_methods block. module Searchable extend ActiveSupport::Concern class_methods do def perform_search_on(klass, associations = {}) ............. end end included do def filter respond_to do |format| format.json { render 'api/search/filters.json' } end end end end When your Searchable module include a...

Count unique values in comma separated value in xslt 1.0

xpath,xslt-1.0

It's possible without nodesets. It's not optimal, of course (hello, Shlemiel The Painter), but it's pretty easy - increment counter only if there is no given string ahead or behind. Template <xsl:template name="calcUnique"> <xsl:param name="str"/> <xsl:param name="back"/> <xsl:param name="count"/> <xsl:if test="$str"> <xsl:choose> <xsl:when test="contains($str, ',')"> <xsl:variable name="part" select="substring-before($str, ',')"/> <xsl:call-template...

Ruby- get a xml node value

ruby,xml

Try to use css instead of xpath, this will work for you, doc = Nokogiri::XML(response.body) values = doc.css('Name').select{|name| name.text}.join',' puts values => Ram,Sam ...

Ruby access words in string

ruby

What you are doing will access the fourth character of String s. Split the string to an array and then access the fourth element as follows. puts s.split[3] Note: Calling split without parameters separates the string by whitespace. Edit: Fixing indexes. The index starts from 0. That means s.split[3] will...

Convert contents of an XmlNodeList to a new XmlDocument without looping

c#,xml,xpath,xmldocument,xmlnodelist

If you're happy to convert it into LINQ to XML, it's really simple: XDocument original = ...; // However you load the original document // Separated out for clarity - could be inlined, of course string xpath = "//Person[not(PersonID = following::Person/PersonID)]" XDocument people = new XDocument( new XElement("Persons", original.XPathSelectElements(xpath) )...

Seeding fails validation for nested tables (validates_presence_of)

ruby-on-rails,ruby,validation,ruby-on-rails-4,associations

Found this : Validating nested association in Rails (last chapter) class User belongs_to :organization, inverse_of: :users validates_presence_of :organization_id, :unless => 'usertype==1' end class Organization has_many :users accepts_nested_attributes_for :users, :reject_if => :all_blank, :allow_destroy => true end The documentation is not quite clear about it but I think it's worth a try....

Get X days out of an Array

ruby,ruby-on-rails-4

I would do: def get_days(wkn, *desired_days) get_week = Model.week(2) get_days_of_week = get_week.select { |x| desired_days.include? x.strftime("%A") } end ...

Appending an element to a page in VoltRb

html,ruby,opalrb,voltrb

Ok, so the problem is that the code you have is being loaded as soon as the compiled .js file loads. You need to run the code once the DOM is ready. The easy way to do this in volt is to run it on a {action}_ready method: module Main...

rails - NameError (undefined local variable or method while using has_many :through

ruby-on-rails,ruby,ruby-on-rails-4

In your associations instead of fac_allocs you need to use a symbol because rails is looking a variable or method named fac_allocs instead of your associated model has_many :facs, through: :fac_allocs ...

XML-XSLT-XPATH : How to convert multiple XML elements to a string, separated by semicolon

xml,xslt,xpath,xslt-2.0

you could use something like: <?xml version="1.0" encoding="UTF-8"?> <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="2.0"> <xsl:output method="text"/> <xsl:template match="/"> <xsl:text>UserNames: "</xsl:text> <xsl:value-of select="/Users/user/username" separator=";"/> <xsl:text>"
</xsl:text> <xsl:text>Names: "</xsl:text> <xsl:value-of select="/Users/user/name" separator=";"/>...