Watir. Scroll to a certain point of the page

问题

I am trying to automate an online survey on a website but I get this error each time:

Selenium::WebDriver::Error::UnknownError: unknown error: Element is not clickable at  
point (561, 864). Other element would receive the click: a id="habla_oplink_a"       

class="habla_oplink_a_normal hbl_pal_header_font_size hbl_pal_title_fg "

What I need to understand is how I can scroll to a certain point of the page so that my script can resume filling out the survey on the page.

This is my code that manages to fill out a portion of the survey but fails when it reaches a row which is not in view inside the browser (a row that requires the user to scroll down to):

buttons = browser.elements(:class => "assessment-choice")

buttons.each do |button|
  button.click
end

I would also like to be able to change my code so that it only selects a specific option but the HTML on the page is not very friendly.

This is the webpage I am looking at: https://staging2.clearfit.com/assessment/assessment/95867fb272df436352a0bd5fbdd

The HTML of one of the options on the survey:

<a id="answers_79_0" class="assessment-choice" onmouseover="answerOver(this)"    onmouseout="answerOut(this)" onclick="setAssessmentAnswer(this, 3, '0', '79',   '#answers_49839163')">Strongly<br>Agree</a>

回答1:

Using execute_script

To scroll to an element, you will need to execute javascript:

browser.execute_script('arguments[0].scrollIntoView();', button)

This can be seen to be working in the following script. Without the line to scroll, a chat tab overlays one of the buttons causing an exception.

require 'watir-webdriver'

browser = Watir::Browser.new :chrome
browser.goto 'https://staging2.clearfit.com/assessment/assessment/95867fb272df436352a0bd5fbdd'

buttons = browser.elements(:class => "assessment-choice")

buttons.each do |button|
    browser.execute_script('arguments[0].scrollIntoView();', button)
    button.click
end

Using the watir-scroll gem

Note that you can install the watir-scroll gem to make the scrolling line nicer. The gem allows the line to simply be:

browser.scroll.to button

The script would then look like:

require 'watir-webdriver'
require 'watir-scroll'

browser = Watir::Browser.new :chrome
browser.goto 'https://staging2.clearfit.com/assessment/assessment/95867fb272df436352a0bd5fbdd'

buttons = browser.elements(:class => "assessment-choice")

buttons.each do |button|
    browser.scroll.to button
    button.click
end

回答2:

Firstly, this should be unnecessary. According to the spec, all element interactions require implicit scrolling to the element. If something does prevent this from happening, though, you can use this Selenium method instead of a javascript implementation:

buttons = browser.elements(:class => "assessment-choice")

buttons.each do |button|
  button.wd.location_once_scrolled_into_view
  button.click
end

回答3:

  public

  def scroll_to(param)
    args = case param
           when :top, :start
             'window.scrollTo(0, 0);'
           when :center
             'window.scrollTo(window.outerWidth / 2, window.outerHeight / 2);'
           when :bottom, :end
             'window.scrollTo(0, document.body.scrollHeight);'
           when Array
             ['window.scrollTo(arguments[0], arguments[1]);', Integer(param[0]), Integer(param[1])]
           else
             raise ArgumentError, "Don't know how to scroll to: #{param}!"
           end

    @browser.execute_script(*args)
  end
  public

  # This method pulls the object on the page you want to interact with, then it 'jumps to it'.
  def jump_to(param)
    # Leveraging the scroll_to(param) logic, this grabs the cooridnates,
    # and then makes them an array that is able to be located and moved to.
    # This is helpful when pages are getting too long and you need to click a button
    # or interact with the browser, but the page 'Cannot locate element'.
    location = param.wd.location
    location = location.to_a
    $helper.scroll_to(location)
  end

Then you just call jump_to(element) and it "Jumps" to it.

This is how I got around it- not sure if that is a normal way. The problem is it goes to point (0,0); working on a version that moves to it to center screen.

来源：https://stackoverflow.com/questions/20057954/watir-scroll-to-a-certain-point-of-the-page