xml – 如何填写在线表格并在R中获得结果

以下代码利用RSelenium将下载示例输入数据(男性,18岁以下,长弓,布里斯托尔V,500)：

library(RSelenium)

# Start Selenium Server --------------------------------------------------------

checkForServer()
startServer()
remDrv <- remoteDriver()
remDrv$open()


# Simulate browser session and fill out form -----------------------------------

remDrv$navigate('http://www.archersmate.co.uk/')
remDrv$findElement(using = "xpath","//input[@value = 'Male']")$clickElement()
Sys.sleep(2) 
remDrv$findElement(using = "xpath","//select[@id = 'drpAge']/option[@value = 'Under 18']")$clickElement()
remDrv$findElement(using = "xpath","//input[@value ='Longbow']")$clickElement() 
remDrv$findElement(using = "xpath","//select[@id = 'rnd']/option[@value = 'Bristol V']")$clickElement()
remDrv$findElement(using = "xpath","//input[@id ='scr']")$sendKeysToElement(list('5','0','0'))
remDrv$findElement(using = "xpath","//input[@id = 'cmdCalc']")$clickElement()

# Retrieve and download results injecting javascript ---------------------------

Sys.sleep(2)
clsf <- remDrv$executeScript(script = 'return $("#txtClass").val();',args = list())[[1]]
hndcp <- remDrv$executeScript(script = 'return $("#txtHandicap").val();',args = list())[[1]]

remDrv$quit()
remDrv$closeServer()

RSelenium的默认浏览器是Firefox.但是,RSelenium甚至支持使用PhantomJS进行无头浏览.为了利用PhanomJS,你只需要

> download PhantomJS并将其放在用户路径中
>如下所述,在开头和结尾替换代码片段

默认浏览(如上所示)：

checkForServer()
startServer()
remDrv <- remoteDriver()

...

remDrv$quit()
remDrv$closeServer()

无头浏览：

pJS <- phantom()
remDrv <- remoteDriver(browserName = 'phantomjs')

...

remDrv$close()
pJS$stop()