"Exploring the possibilities of RSelenium and Javascript together

While I have a strong understanding of R, my knowledge in javaScript and other languages is very limited. My goal is to access information from a publicly-available data set found here: . Specifically, I have a list of postal codes formatted as 'A1A1A1' within a data frame. I want to input each of these postal codes into the website and then extract the name of the electoral district that is returned. RSelenium appears to be the ideal tool for this task, but I am struggling with getting the javascript to function properly.

require(RSelenium)
checkForServer()
startServer()
remDr<-remoteDriver()
remDr$open()
remDr$getStatus()
remDr$navigate("http://fyed.elections.on.ca/fyed/en/form_page_en.jsp")

#Upon inspecting the source code, it is clear that the input box has the id 'pcode', representing postal code
webElem<-remDr$findElement(using = 'id', value = "pcode")
webElem$getElementAttribute('id')

#This is where I am encountering difficulties
remDr$executeScript(script='arguments[0].click(m1p4v4)', list(webElem))

#Since I have numerous postal codes, I aim to create a loop to gather all district names from the successfully executed javascript (as seen in the previous command). Here are three real postal codes with results:
p.codes<-c('m1p4v4', 'n3t2y3', 'n2h3v1')

I believe my struggle lies in understanding the necessary javascript commands or the syntax of executeScript to achieve the desired outcome. Any assistance would be greatly appreciated.

javascriptrseleniumweb-scraping

Answer №1

It is not necessary to utilize executeScript in this scenario:

require(RSelenium)
checkForServer()
startServer()
remDr<-remoteDriver()
remDr$open()
remDr$getStatus()
remDr$navigate("http://fyed.elections.on.ca/fyed/en/form_page_en.jsp")

p.codes<-c('m1p4v4', 'n3t2y3', 'n2h3v1')
webElem<-remDr$findElement(using = 'id', value = "pcode")
webElem$sendKeysToElement(list(p.codes[1])) # send the first post code to the element

remDr$findElement("id", "en_btn_arrow")$clickElement() # find the submit button and click it

If you prefer to use executeScript, you can replace the last line with the following:

remDr$executeScript("arguments[0].click();"
                , list(remDr$findElement("id", "en_btn_arrow")))

The executeScript function requires a script as an argument and a list. Any elements of the list that are of class webElement can be referenced in the script similar to a DOM element. In this case, we access the first element (zero index in JavaScript) as a webElement and instruct it to be clicked in our JavaScript.

Additionally, upon examining the source code linked to the button, you will discover that when it is activated, it triggers document.pcode.submit(). Thus, if you wish to use executeScript in this instance, you could simply execute:

remDr$executeScript("document.pcode.submit();")

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