click_on和click_link之间的区别？ [英] Difference between click_on and click_link?

问题描述

我正在编写请求规范，并且正在使用poltergeist-1.0.2和capybara-1.1.2。我有以下代码：

I am writing request specs and I am using poltergeist-1.0.2 and capybara-1.1.2. I have the following code:

    login_as @user, 'Test1234!'
    click_on 'Virtual Terminal'

该登录名带有Flash消息，向用户显示他已成功登录。当我使用click_link时，规范失败，因为Capybara找不到元素虚拟终端，但是当我使用click_on时，一切都会通过。 虚拟终端不是按钮，而是链接。

the login has flash message that shows to the user that he is successfully logged in. When I am using click_link, the spec fails because Capybara can't find element 'Virtual Terminal' but when I am using click_on everything passes. 'Virtual Terminal' is not a button, it is a link.

click_on和click_link有什么区别。

What is the difference between click_on and click_link.

推荐答案

单击链接使用一个查找程序，该查找程序指定您要查找与您提供的定位器的链接，然后按如下所示单击它：

Click link uses a finder which specifies that you are looking for a link with the locator you provided and then does click on it as such:

def click_link(locator, options={})
  find(:link, locator, options).click
end

单击而是使用查找器，该查找器应指定为链接或按钮，例如：

Click on instead uses a finder that specifies that it should be a link or a button as:

def click_link_or_button(locator, options={})
  find(:link_or_button, locator, options).click
end
alias_method :click_on, :click_link_or_button

来源：水豚动作

这又将我们引向选择器： link和：link_or_button，其定义如下：

This leads us in turn to the selectors :link and :link_or_button and that is defined as follows:

Capybara.add_selector(:link_or_button) do
  label "link or button"
  xpath { |locator| XPath::HTML.link_or_button(locator) }
  filter(:disabled, :default => false) { |node, value| node.tag_name == "a" or not(value ^ node.disabled?) }
end

Capybara.add_selector(:link) do
  xpath { |locator| XPath::HTML.link(locator) }
  filter(:href) do |node, href|
    node.first(:xpath, XPath.axis(:self)[XPath.attr(:href).equals(href.to_s)])
  end
end

来源：Capubara选择器

Xpath定位器仅在搜索链接或链接和按钮方面有所不同，如以下源代码所示：

The Xpath locators only differ in searching for link or link and button as shown in this sourcecode:

def link_or_button(locator)
  link(locator) + button(locator)
end

def link(locator)
  link = descendant(:a)[attr(:href)]
  link[attr(:id).equals(locator) | string.n.contains(locator) |  attr(:title).contains(locator) | descendant(:img)[attr(:alt).contains(locator)]]
end

def button(locator)
  button = descendant(:input)[attr(:type).one_of('submit', 'reset', 'image', 'button')][attr(:id).equals(locator) | attr(:value).contains(locator) | attr(:title).contains(locator)]
  button += descendant(:button)[attr(:id).equals(locator) | attr(:value).contains(locator) | string.n.contains(locator) | attr(:title).contains(locator)]
  button += descendant(:input)[attr(:type).equals('image')][attr(:alt).contains(locator)]
end

来源： Xpath html

如您所见，按钮定位器实际上发现了许多不同的类型，如果我有html源代码，则可以确定链接是否存在。

As you can see the button locator actually finds a lot of different types which your link might fall under, if I had the html source code I could tell if it does or not.

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