Watir. Scroll to a certain point of the page

Question

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>

Answer 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