Rselenium / 对话框

Question

我是 RSelenium 的新手。我有一份芬兰公司的名单，我想在网页上提取相应的企业 ID https://tietopalvelu.ytj.fi/yrityshaku.aspx?kielikoodi=3

我的 R 代码的一个简单版本如下：

library(RSelenium)
name_company <- c("nokia", "test")
driver <- rsDriver(browser= 'firefox', port = 16L)

remote_driver <- driver[["client"]] 
remote_driver$navigate("https://tietopalvelu.ytj.fi/yrityshaku.aspx?kielikoodi=3")

input1 <- remote_driver$findElement(using = 'id', value = '_ctl0_cphSisalto_hakusana')
input1$sendKeysToElement(list(name_company[1])) # Name of the company

button_element1 <- remote_driver$findElement(using = 'id', value = '_ctl0_cphSisalto_sanahaku')
button_element1$clickElement() # Tick the box "word search"

button_element2 <- remote_driver$findElement(using = 'id', value = '_ctl0_cphSisalto_Hae')
button_element2$clickElement()

output <- remote_driver$findElement(using = "id", value="search-result")
output <- output$getElementText() # output including Business ID

当公司名称为“nokia”（在我的示例中是矢量的第一个元素）时，它运行良好，但当它为“test”时，我得到对话框：“未找到与搜索选项的匹配项”。

我想在我拥有的所有公司名称的向量上循环这段代码。（例如 c("nokia", "kone", "blabla", ...) ) 如何保证循环不被对话框停止？我希望这很清楚。

谢谢。

亚历克西斯

Answer 1

您应该使用 tryCatch 函数。它能够管理系统返回给您的错误。下面是一个关于如何在您的代码中实现它的简单示例。

这里是函数的结构

tryCatch(                       
  expr = {                      # Specifying expression
    1 + 1
    message("Everything was fine.")
  },
  error = function(e){          # Specifying error message
    message("There was an error message.")
  },
  warning = function(w){        # Specifying warning message
    message("There was a warning message.")
  },
  finally = {                   # Specifying final message
    message("tryCatch is finished.")
  }
)

这里是如何在您的代码中实现 trycatch 功能

library(RSelenium)
name_company <- c("nokia", "test")
driver <- rsDriver(browser= 'firefox', port = 16L)
remote_driver <- driver[["client"]] 
remote_driver$navigate("https://tietopalvelu.ytj.fi/yrityshaku.aspx?kielikoodi=3")

for (i in 1:length(name_company)) {
  
# different operations 

tryCatch(expr = {
input1 <- remote_driver$findElement(using = 'id', value = '_ctl0_cphSisalto_hakusana')
input1$sendKeysToElement(list(name_company[i])) # Name of the company

button_element1 <- remote_driver$findElement(using = 'id', value = '_ctl0_cphSisalto_sanahaku')
button_element1$clickElement() # Tick the box "word search"

button_element2 <- remote_driver$findElement(using = 'id', value = '_ctl0_cphSisalto_Hae')
button_element2$clickElement()

output <- remote_driver$findElement(using = "id", value="search-result")
output <- output$getElementText() # output including Business ID
}, 
error = function(e){          # Specifying error message
  message("There was an error message.")
})
  
# other operations 
}

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