R - Waiting for page to load in RSelenium with PhantomJS

Solution using while/tryCatch:

remDr$navigate("<webpage url>")
webElem <-NULL
while(is.null(webElem)){
  webElem <- tryCatch({remDr$findElement(using = 'name', value = "<value>")},
  error = function(e){NULL})
 #loop until element with name <value> is found in <webpage url>
}