关闭确认弹窗后出现模态对话框（Selenium::WebDriver::Error::UnhandledAlertError）

Question

我有一个页面，类似于这样的内容：

<input type="button" onclick="confirm('confirm popup');" value="click" />

当我进入页面并点击链接时：

require "watir-webdriver"
browser = Watir::Browser.new
browser.goto "page.html"
browser.button.click

确认弹出窗口出现。我可以用以下方法关闭它：

require "watir-webdriver/extensions/alerts"
browser.confirm(true) {browser.button(:value => 'Confirm').click}

但我收到了这个错误信息：

[remote server] file:///var/folders/yx/bz_81fc143b4r9pyhks300m00000gn/T/webdriver-profile20120218-1562-7b7q8d/extensions/[e-mail]/components/command_processor.js:10302:in `unknown': Modal dialog present (Selenium::WebDriver::Error::UnhandledAlertError)
    from [remote server] file:///var/folders/yx/bz_81fc143b4r9pyhks300m00000gn/T/webdriver-profile20120218-1562-7b7q8d/extensions/[e-mail]/components/driver-component.js -> file:///var/folders/yx/bz_81fc143b4r9pyhks300m00000gn/T/webdriver-profile20120218-1562-7b7q8d/extensions/[e-mail]/components/dispatcher.js:85:in `unknown'
    from [remote server] file:///var/folders/yx/bz_81fc143b4r9pyhks300m00000gn/T/webdriver-profile20120218-1562-7b7q8d/extensions/[e-mail]/components/driver-component.js -> file:///var/folders/yx/bz_81fc143b4r9pyhks300m00000gn/T/webdriver-profile20120218-1562-7b7q8d/extensions/[e-mail]/components/dispatcher.js:516:in `unknown'
    from [remote server] file:///var/folders/yx/bz_81fc143b4r9pyhks300m00000gn/T/webdriver-profile20120218-1562-7b7q8d/extensions/[e-mail]/components/driver-component.js -> file:///var/folders/yx/bz_81fc143b4r9pyhks300m00000gn/T/webdriver-profile20120218-1562-7b7q8d/extensions/[e-mail]/components/dispatcher.js:351:in `unknown'
    from [remote server] file:///var/folders/yx/bz_81fc143b4r9pyhks300m00000gn/T/webdriver-profile20120218-1562-7b7q8d/extensions/[e-mail]/components/driver-component.js -> file:///var/folders/yx/bz_81fc143b4r9pyhks300m00000gn/T/webdriver-profile20120218-1562-7b7q8d/extensions/[e-mail]/components/webdriverserver.js:47:in `unknown'
    from [remote server] file:///var/folders/yx/bz_81fc143b4r9pyhks300m00000gn/T/webdriver-profile20120218-1562-7b7q8d/extensions/[e-mail]/components/httpd.js:1935:in `unknown'
    from [remote server] file:///var/folders/yx/bz_81fc143b4r9pyhks300m00000gn/T/webdriver-profile20120218-1562-7b7q8d/extensions/[e-mail]/components/httpd.js:2261:in `unknown'
    from [remote server] file:///var/folders/yx/bz_81fc143b4r9pyhks300m00000gn/T/webdriver-profile20120218-1562-7b7q8d/extensions/[e-mail]/components/httpd.js:1168:in `unknown'
    from [remote server] file:///var/folders/yx/bz_81fc143b4r9pyhks300m00000gn/T/webdriver-profile20120218-1562-7b7q8d/extensions/[e-mail]/components/httpd.js:1616:in `unknown'
    from [remote server] file:///var/folders/yx/bz_81fc143b4r9pyhks300m00000gn/T/webdriver-profile20120218-1562-7b7q8d/extensions/[e-mail]/components/httpd.js:1464:in `unknown'
    from [remote server] file:///var/folders/yx/bz_81fc143b4r9pyhks300m00000gn/T/webdriver-profile20120218-1562-7b7q8d/extensions/[e-mail]/components/httpd.js:1333:in `unknown'
    from /Users/zeljko/.rvm/gems/ruby-1.9.3-p125/gems/selenium-webdriver-2.19.0/lib/selenium/webdriver/remote/response.rb:52:in `assert_ok'
    from /Users/zeljko/.rvm/gems/ruby-1.9.3-p125/gems/selenium-webdriver-2.19.0/lib/selenium/webdriver/remote/response.rb:15:in `initialize'
    from /Users/zeljko/.rvm/gems/ruby-1.9.3-p125/gems/selenium-webdriver-2.19.0/lib/selenium/webdriver/remote/http/common.rb:59:in `new'
    from /Users/zeljko/.rvm/gems/ruby-1.9.3-p125/gems/selenium-webdriver-2.19.0/lib/selenium/webdriver/remote/http/common.rb:59:in `create_response'
    from /Users/zeljko/.rvm/gems/ruby-1.9.3-p125/gems/selenium-webdriver-2.19.0/lib/selenium/webdriver/remote/http/default.rb:64:in `request'
    from /Users/zeljko/.rvm/gems/ruby-1.9.3-p125/gems/selenium-webdriver-2.19.0/lib/selenium/webdriver/remote/http/common.rb:40:in `call'
    from /Users/zeljko/.rvm/gems/ruby-1.9.3-p125/gems/selenium-webdriver-2.19.0/lib/selenium/webdriver/remote/bridge.rb:590:in `raw_execute'
    from /Users/zeljko/.rvm/gems/ruby-1.9.3-p125/gems/selenium-webdriver-2.19.0/lib/selenium/webdriver/remote/bridge.rb:568:in `execute'
    from /Users/zeljko/.rvm/gems/ruby-1.9.3-p125/gems/selenium-webdriver-2.19.0/lib/selenium/webdriver/remote/bridge.rb:314:in `executeScript'
    from /Users/zeljko/.rvm/gems/ruby-1.9.3-p125/gems/selenium-webdriver-2.19.0/lib/selenium/webdriver/common/driver.rb:209:in `execute_script'
    from /Users/zeljko/.rvm/gems/ruby-1.9.3-p125/gems/watir-webdriver-0.5.3/lib/watir-webdriver/browser.rb:129:in `execute_script'
    from /Users/zeljko/.rvm/gems/ruby-1.9.3-p125/gems/watir-webdriver-0.5.3/lib/watir-webdriver/extensions/alerts.rb:39:in `confirm'
    from popup.rb:7:in `<main>'

我做错了什么？

环境：

• Mac OS X 10.7.3
• Firefox 10.0.2
• Ruby 1.9.3p125
• selenium-webdriver 2.19.0
• watir-webdriver 0.5.3

- Željko Filipin

Answer 1

我会推荐你阅读这篇回答：https://dev59.com/UV3Ua4cB1Zd3GeqP_VTP#8172888，其中我讲解了如何使用browser.confirm等方法。这些例子有点令人困惑，因为它们直接来自测试，如果你不理解当前页面上有多个按钮，而那个弹出确认对话框的按钮值为“confirm”，那么该方法包裹的“inner”命令就没有多少意义。

循环或块中在confirm方法后的命令是导致弹出窗口出现的命令。

因此，更好的示例可能会是：

alert_message_text = browser.confirm(true) do
  #watir code that causes confirm popup goes here
end 

或者

alert_message_text = browser.confirm(true) {#code that causes confirm popup}

换句话说，使用.confirm(response) {block}的方式很像告诉watir：“好的，我在块中给你发送的命令将会触发一个确认对话框，当它出现时，我希望你执行response指定的操作。”

因此，你做错了的是块内部的命令，你需要将“browser.button.click”或类似的东西移动到块内部。你的代码最终会看起来像这样：

require "watir-webdriver"
require "watir-webdriver/extensions/alerts"

browser = Watir::Browser.new
browser.goto "page.html"
browser.confirm(true) {browser.button(:value => 'click').click}

我将您的点击操作更具体化，根据您提供的HTML中的value属性来识别按钮。如果您确定它始终是页面上的第一个按钮，您可以将最后一行更改为

browser.confirm(true) {browser.button.click}

- Chuck van der Linden

---

谢谢Chuck。在奥斯汀有一杯啤酒等着你。:) 有趣的是，当我使用browser.confirm(true) {browser.button.click}时，我没有看到弹出窗口出现。我猜它覆盖了window.confirmJavaScript函数，类似于browser.execute_script("window.confirm = function() {return true}")。 - Željko Filipin

可能是这样，但是你的代码执行了应该让它出现的点击事件，所以不确定出了什么问题。我会请你喝一杯啤酒的。如果你有时间把上面提到的信息和其他链接答案中的信息放到watir维基或其他更容易让我们的用户找到的地方，我会回请你一杯啤酒。 - Chuck van der Linden

计划将所有内容都放入书中，但我迄今为止还没有时间。应该在Bazaar之前出现在书中。 - Željko Filipin