使无头浏览器停止加载页面 [英] Make headless browser stop loading page

问题描述

我正在使用 watir-webdriver ruby​​ gem.它启动浏览器 (Chrome) 并开始加载页面.页面加载太慢，watir-webdriver 引发超时错误.如何让浏览器停止加载页面?

I am using the watir-webdriver ruby gem. It starts the browser (Chrome) and begins to load a page. The page is loading too slowly, and watir-webdriver raises a timeout error. How can I make the browser stop loading the page?

require 'watir-webdriver'

client = Selenium::WebDriver::Remote::Http::Default.new
client.timeout = 10
@browser = Watir::Browser.new :chrome, :http_client => client

sites = [
  "http://google.com/",
  "http://yahoo.com/",
  "http://www.nst.com.my/", # => This is the SLOW site
  "http://drupal.org/",
  "http://www.msn.com/",
  "http://stackoverflow.com/"
]

sites.each do |url|

  begin
    @browser.goto(url)
    puts "Success #{url}"
  rescue
    puts "Timeout #{url}"
  end

end

########## Execution result ########## 

# Success http://google.com/
# Success http://yahoo.com/
# Timeout http://www.nst.com.my/
# Timeout http://drupal.org/
# Timeout http://www.msn.com/
# Timeout http://stackoverflow.com/

########## Expected result ########## 

# Success http://google.com/
# Success http://yahoo.com/
# Timeout http://www.nst.com.my/
# Success http://drupal.org/
# Success http://www.msn.com/
# Success http://stackoverflow.com/

浏览器在完成页面加载之前似乎没有响应任何其他命令.如何强制浏览器丢弃正在加载的页面并执行下一个命令?

It looks like the browser doesn't respond to any other commands before it finishes loading the page. How can I force the browser to throw away the page it is loading and execute the next command?

更新

我发现了一个有趣的功能标志 loadAsync http://src.chromium.org/svn/trunk/src/chrome/test/webdriver/webdriver_capabilities_parser.cc 也许它对解决这个问题有用?我还不明白如何在启动 chromedriver 时让 watir (webdriver) 设置它.此处引入了此标志 http://codereview.chromium.org/7582005/

I have found an interesting capability flag loadAsync http://src.chromium.org/svn/trunk/src/chrome/test/webdriver/webdriver_capabilities_parser.cc Maybe it can be useful for solving this problem? I don't understand yet how to make watir (webdriver) to set this when starting the chromedriver. This flag was introduced here http://codereview.chromium.org/7582005/

推荐答案

有几种不同的方法可以做你想做的事，但我会这样做:

There are a couple of different ways to do what you're wanting, but here's what I would do:

require 'watir-webdriver'

client = Selenium::WebDriver::Remote::Http::Default.new
client.timeout = 60 
@browser = Watir::Browser.new :firefox, :http_client => client

begin
  @browser.goto mySite
rescue => e
  puts "Browser timed out: #{e}"
end

next_command

如果您有很多站点要尝试加载以确认是否超时，请将它们放入一个数组中:

If you have a lot of sites you're trying to load for confirmation of timeout or not, put them in an array:

mySites = [
          mySite1,
          mySite2,
          mySite3
]

mySites.each do |site|
   begin
      @browser.goto site
   rescue
      "Puts #{site} failed to load within the time allotted."
   end
end

更新概念证明.这个脚本总是继续到第 2 步.第二个 goto 甚至不需要救援，而是用于更清晰的输出.您的脚本与此有何不同?

UPDATE for proof of concept. This script always proceeds to step 2. The rescue isn't even necessary for the second goto, but is being used for clearer output. How is your script different than this?

require 'watir-webdriver'

client = Selenium::WebDriver::Remote::Http::Default.new
client.timeout = 1     #VERY low timeout to make most sites fail
@browser = Watir::Browser.new :firefox, :http_client => client


def testing
   begin
     @browser.goto "http://www.cnn.com"
   rescue => e
     puts "Browser timed out on the first example"
   end

   begin
     @browser.goto "http://www.foxnews.com"
   rescue => e
     puts "Browser timed out on the second example"
   end
end

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