Why can't my Capybara/Poltergeist test select from a jQuery autocomplete field?

问题

UPDATE: I have fixed this problem after lots of painstaking work on my own. I am happy to be a resource to anybody needing a hand with this. Here is a gist of my working setup.

I have tried every solution I could find Google and SO. Here are some different things I have tried:

page.execute_script %Q{$('#{selector}').val('#{value}').trigger('keydown')}

and

fill_in field, with: options[:with]
page.execute_script %Q{ $('##{field}').trigger('focus') }
page.execute_script %Q{ $('##{field}').trigger('keydown') }

This is what fails:

page.should have_selector('ul.ui-autocomplete li.ui-menu-item a')

But it's definitely there when I look at it in Firebug and test it in the browser.

Here are all of the details, including a restatement of those above. Remember, the autocomplete field works fine in the browser.

listing_integration_spec.rb

require "spec_helper"

describe "Listing Integration" do

  let!(:user) { login_user }

  it "lets a user add information listing", js: true do
    listing = create(:listing, user: user)
    click_link('Additional Information')
    click_link('Create')
    fill_autocomplete('listings_search', with: listing.item_id)
  end

end

spec/support/feature_helper.rb

def fill_autocomplete(field, options = {})
  fill_in field, with: options[:with]
  page.execute_script %Q{ $('##{field}').trigger('focus') }
  page.execute_script %Q{ $('##{field}').trigger('keydown') }
  selector = %Q{ul.ui-autocomplete li.ui-menu-item a:contains('#{options[:with]}')}
  page.should have_selector('ul.ui-autocomplete li.ui-menu-item a')
  page.execute_script %Q{ $("##{selector}").trigger('mouseenter').click() }
end

ERB from view template

<%= simple_fields_for :listings  do |f| %>
  <%= f.input :search, label: "Search by Listing", required: true %>
<% end %>

and the Coffeescript:

$("#listings_search").autocomplete
  source: (request, response) ->
    options = 
      term: request.term
    $.get "/search_listings", options, (data) ->
      if data.length == 0
        alert "No listings found."
      response data
  minLength: 2
  select: (event, ui) ->
    add_listing_hash = 
      type: "GET"
      url: "/add_listing"
      data: { id: ui.item.id }
      success: () ->
    $.ajax(add_listing_hash)

回答1:

JS drivers are generally meh, they're slow and not single one of them covers 100% of function, and they're often quirky and hard to debug, but I'm sure you've got that figured out by now.

I've got similar piece of code working on rails 3.2, minitest and poltergeist 1.3.0 (an ajaxed dropdown) but it kind of breaks periodically for no good reason (one might say it has a poltergeist? I have already resorted switching that test between selenium and poltergeist a couple times so far), not sure why autocompleter wouldn't work for you but it feels like a bug,

submit issue to https://github.com/jonleighton/poltergeist (you already have? https://github.com/jonleighton/poltergeist/issues/439), try changing to selenium or webkit, see if it works, you can use a different driver in this one test if it gets you out of the woods (it beats losing days of work over a widget that works).

回答2:

I've found several solutions online, none of which work with current versions of Poltergeist, Capybara, and Autocomplete. But I learned enough from them to make a working helper method, with no sleep calls.

def fill_autocomplete(css_id, page, options = {})
  find("#{css_id}").native.send_keys options[:with]
  page.execute_script %{ $('#{css_id}').trigger('focus') }
  page.execute_script %{ $('#{css_id}').trigger('keydown') }
  selector = %{ul.ui-autocomplete li.ui-menu-item:contains("#{options[:select]}")}
  expect(page).to have_selector('ul.ui-autocomplete li.ui-menu-item')
  page.execute_script %{ $('#{selector}').trigger('mouseenter').click() }
end

Example usage:

fill_autocomplete(
  '#contact_filter_company',
  listing_page,
  with:   'acm',
  select: 'Acme'
)

I have a page argument because I'm using SitePrism - if you're not, you can strip it out.

I'm using this with:

jQuery UI Autocomplete 1.11.2
poltergeist 1.5.1
capybara 2.4.4
rspec 3.1.0

回答3:

I was able to test my autocompleting text field with Poltergeist without much trouble. The main thing to know about is Poltergeist's .native.send_keys method.

Hacking together a summary out of the Cucumber steps where these lines of code actually live in my project:

find('#username').native.send_keys "the" # this field autocompletes usernames
wait_until { all('a', text: "the_username").any? }
find('a', text: "the_username").click

Then I submit the form and assert the expected results on the following page in the usual way.

wait_until (a reimplementation of a method which was removed from Capybara 2) takes a block which returns true when we should stop waiting. It's faster than waiting for 5 seconds or whatever every time.

def wait_until(delay = 1)
  seconds_waited = 0
  while ! yield && seconds_waited < Capybara.default_wait_time
    sleep delay
    seconds_waited += 1
  end
  raise "Waited for #{Capybara.default_wait_time} seconds but condition did not become true" unless yield
end

回答4:

I think perhaps you need a mixture of triggering KEYDOWN, but also setting the keycode to DOWN.

e.g.

var keyEvent = $.Event("keydown");
keyEvent.keyCode = $.ui.keyCode.DOWN;  

$("#autocomplete").val("j");       

$("#autocomplete").trigger(keyEvent);

Here is a working jsfiddle example showing an item selected by the autocomplete: http://jsfiddle.net/alexkey/74BST/ I'm not sure why you need to trigger keydown twice, but that's a problem to solve separately (if a problem at all).

However I'm not familiar with the unit testing framework you are using, but I hope the above helps.

Credit goes to JQuery AutoComplete, manually select first searched item and bind click

I'm using the example code form: http://api.jqueryui.com/autocomplete/#entry-examples

The autocomplete unit tests that the jquery-ui team uses may come in useful for inspiration: https://github.com/jquery/jquery-ui/tree/master/tests/unit/autocomplete

Also a reference to the keycode: http://api.jqueryui.com/jQuery.ui.keyCode/

回答5:

I had this problem and no proposed solution could solve it. My tests always failed when trying to find the ul.ui-autocomplete element. I finally noticed, that jQuery autocomplete appends the ul to the end of the html page and NOT to the input field in question. In my spec, I follow the practice of targeting my forms explicitly by within my_form do and doing all the fill_instuff inside this block:

within my_form do
  fill_autocomplete …
end

Of course this could never find the ul attached OUTSIDE this form element. My solution was simple: Use jQuery autocomplete's attribute appendTo: '#id_of_input_field' when initializing autocomplete. Now it can find my uland everything works fine.

来源：https://stackoverflow.com/questions/20830194/why-cant-my-capybara-poltergeist-test-select-from-a-jquery-autocomplete-field

标签

ruby-on-rails

rspec

capybara

jquery-autocomplete

poltergeist