Question

鉴于我有：

b = Watir::Browser.new
b.goto 'google.com'
string = "div(:id => 'main')"

string由用户提供。

有没有办法使用指定的字符串，它描述了如何定位元素，在浏览器中找到元素？换句话说，我如何执行字符串，如下所示：

b.div(:id => 'main')

我尝试使用b.send(string)，但这只适用于string = url：

b = Watir::Browser.new
b.goto 'google.com'
string = "div(:id => 'main')"
b.send(string)
#=> "https://www.google.com"

在查找元素时，如string = "div(:id =>'main')"，我得到一个未定义的方法错误：

b = Watir::Browser.new
b.goto 'google.com'
string = "div(:id => 'main')"
b.send(string)
#=> undefined method `div(:id =>'main')' for #

Answer 1

如果你把Watir命令作为字符串，我认为命令会变得更复杂。例如：

# Locating based on a partial match (ie regexp)
string = "div(:id => /main/)"

# A locator value with non-word characters
string = "link(:href => 'some/url')"    

# Locating nested elements
string = "div(:id => 'main').span(:class => 'text')"

手动解析这些类型的字符串比仅扫描字符串更复杂。例如，在正则表达式示例中，只扫描单词最终会为您提供定位器{"id"=>"main", :tag_name=>"div"}。请注意，id现在正在寻找“main”的完全匹配，这不是字符串所需的。

因此，我认为您应该使用instance_eval，这将消除手动解析的需要：

require 'watir-webdriver'

b=Watir::Browser.new
b.goto 'https://www.google.com'

# Original string
string = "div(:id =>'main')"
p b.instance_eval(string)
#=> #<Watir::Div:0x61221438 located=false selector={:id=>"main", :tag_name=>"div"}>

# Locating based on a partial match (ie regexp)
string = "div(:id => /main/)"
#=> #<Watir::Div:0x42afd800 located=false selector={:id=>/main/, :tag_name=>"div"}>

# A locator value with non-word characters
string = "link(:href => 'some/url')"    
p b.instance_eval(string)
#=> #<Watir::Anchor:0x2b625f26 located=false selector={:href=>"some/url", :tag_name=>"a"}>

# Locating nested elements
string = "div(:id => 'main').span(:class => 'text')"
p b.instance_eval(string)
#=> #<Watir::Span:0x..fb341cd56 located=false selector={:class=>"text", :tag_name=>"span"}>

Answer 2

请尝试以下操作：

require 'watir-webdriver'

b=Watir::Browser.new
b.goto 'https://www.google.com'

string = "div(:id =>'main')"
meth,*selector_arr = string.scan(/\w+/)
# => ["div", "id", "main"]
selector_hsh = Hash[*selector_arr]
p b.send(meth,selector_hsh)
# >> #<Watir::Div:0x5b248f1c located=false selector={"id"=>"main", :tag_name=>"div"}>

如何将字符串转换为元素调用

2 个答案: