使用RSelenium选择textbox

Question

启动RSelenium

library(RSelenium)
RSelenium::startServer()
pJS <- phantom()
Sys.sleep(5) # give the binary a moment
remDr <- remoteDriver(browserName = 'phantomjs')
remDr$open()

到网站上等一会儿

remDr$navigate("http://ideal-scope.com/online-holloway-cut-adviser/")
Sys.sleep(5)

现在，当我试图在文本框中找到元素时

  depthElem <- remDr$findElements("name","depth_textbox")
  tableElem <- remDr$findElements("name","table_textbox")
  crownElem <- remDr$findElements("name","crown_textbox")
  pavilionElem <- remDr$findElements("name","pavilion_textbox")

...just给了我一堆list()对象

如果我做findElement而不是findElements，我会得到

Error:   Summary: NoSuchElement
 Detail: An element could not be located on the page using the given search parameters.

如何选择这些文本框？为什么我不能通过搜索名字来选择它们呢？

Answer 1

当不存在任何元素时，findElements方法返回一个空列表。该页面具有您在iframe中所需的内容。在搜索元素之前，首先需要切换到iframe：

remDr$navigate("http://ideal-scope.com/online-holloway-cut-adviser/")
# get iframes
webElems <- remDr$findElements("css", "iframe")
# there is only one
remDr$switchToFrame(webElems[[1]])

depthElem <- remDr$findElement("name","depth_textbox")
# > depthElem$getElementAttribute("name")
# [[1]]
# [1] "depth_textbox"
remDr$findElement("name","table_textbox")
crownElem <- remDr$findElement("name","crown_textbox")
pavilionElem <- remDr$findElement("name","pavilion_textbox")