Wait for web page to finish loading - again

Scripting Forums AppleScript | Mac OS X
#1

This script

tell application "Safari"
	activate
	open location "https://www.facebook.com/events/?date_filter_option=TODAY&location_id= 111948785483165&start_date=TODAY&discover_tab=CUSTOM"
	repeat while document 1's source = ""
		delay 0.5
	end repeat
	tell document 1 to repeat
		log (do JavaScript "document.readyState")
	end repeat
end tell

returns, I sh*t you not, this (I comment/explain below the result):

tell application “Safari”
activate
open location “Events Near Me | Facebook”
get source of document 1
do JavaScript “document.readyState”
(complete)
do JavaScript “document.readyState”
(complete)
do JavaScript “document.readyState”
(complete)
do JavaScript “document.readyState”
(complete)
do JavaScript “document.readyState”
(complete)
do JavaScript “document.readyState”
(complete)
do JavaScript “document.readyState”
(complete)
do JavaScript “document.readyState”
(complete)
do JavaScript “document.readyState”
(complete)
do JavaScript “document.readyState”
(complete)
do JavaScript “document.readyState”
(complete)
do JavaScript “document.readyState”
(complete)
do JavaScript “document.readyState”
(complete)
do JavaScript “document.readyState”
(complete)
do JavaScript “document.readyState”
(complete)
do JavaScript “document.readyState”
(complete)
do JavaScript “document.readyState”
(complete)
do JavaScript “document.readyState”
(complete)
do JavaScript “document.readyState”
(complete)
do JavaScript “document.readyState”
(complete)
do JavaScript “document.readyState”
(complete)
do JavaScript “document.readyState”
(complete)
do JavaScript “document.readyState”
(complete)
do JavaScript “document.readyState”
(loading)
do JavaScript “document.readyState”
(loading)
do JavaScript “document.readyState”
(loading)
do JavaScript “document.readyState”
(loading)
do JavaScript “document.readyState”
(loading)
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do JavaScript “document.readyState”
(loading)
do JavaScript “document.readyState”
(loading)
do JavaScript “document.readyState”
(loading)
do JavaScript “document.readyState”
(loading)
do JavaScript “document.readyState”
(loading)
do JavaScript “document.readyState”
(loading)
do JavaScript “document.readyState”
(loading)
do JavaScript “document.readyState”
(loading)
do JavaScript “document.readyState”
(loading)
do JavaScript “document.readyState”
(loading)
do JavaScript “document.readyState”
(loading)
do JavaScript “document.readyState”
(loading)
do JavaScript “document.readyState”
(loading)
do JavaScript “document.readyState”
(loading)
do JavaScript “document.readyState”
(loading)
do JavaScript “document.readyState”
(loading)
do JavaScript “document.readyState”
(loading)
do JavaScript “document.readyState”
(loading)
do JavaScript “document.readyState”
(loading)
do JavaScript “document.readyState”
(loading)
do JavaScript “document.readyState”
(loading)
do JavaScript “document.readyState”
(loading)
do JavaScript “document.readyState”
(loading)
do JavaScript “document.readyState”
(loading)
do JavaScript “document.readyState”
(loading)
do JavaScript “document.readyState”
(loading)
do JavaScript “document.readyState”
(loading)
do JavaScript “document.readyState”
(loading)
do JavaScript “document.readyState”
(loading)
do JavaScript “document.readyState”
(loading)
do JavaScript “document.readyState”
(loading)
do JavaScript “document.readyState”
(loading)
do JavaScript “document.readyState”
(loading)
do JavaScript “document.readyState”
(loading)
do JavaScript “document.readyState”
(loading)
do JavaScript “document.readyState”
(loading)
do JavaScript “document.readyState”
(loading)
do JavaScript “document.readyState”
(loading)
do JavaScript “document.readyState”
(loading)
do JavaScript “document.readyState”
(loading)
do JavaScript “document.readyState”
(complete)
do JavaScript “document.readyState”
(complete)
do JavaScript “document.readyState”
(complete)
do JavaScript “document.readyState”
(complete)
do JavaScript “document.readyState”
(complete)

First there are 23 loops when the page is complete, and then a couple of hundred (I didn’t count) loops where it is loading (After it was complete!!!) followed by complete again.

The problem is obvious, When I check if the page is fully loaded I get a positive answer in spite of there is a second loading a few moments later. And in the next step in my script it expects the page to be fully loaded, but since it isn’t my script breaks.

Are there other methods than checking the source or the readyState that could work in my situation? Maybe access Safari’s JS-engine and check if it is busy or idle?

#2

As I sad in the previous topic, do JavaScript “document.readyState” doesn’t work consistently. In my tests following script returns empty string… That is the reason why I suggested to you 2 other scripts in the previous topic.

tell application "Safari"
	activate
	open location "https://www.facebook.com/events/?date_filter_option=TODAY&location_id= 111948785483165&start_date=TODAY&discover_tab=CUSTOM"
	tell document 1 to do JavaScript "document.readyState=\"loading\""
	repeat until ((do JavaScript "document.readyState" in document 1) is "complete")
		delay 0.5
	end repeat
	get document 1's source --> ""
end tell

.
Following works consistently:
.

tell application "Safari"
	open location "https://www.facebook.com/events/?date_filter_option=TODAY&location_id= 111948785483165&start_date=TODAY&discover_tab=CUSTOM"
	my waitSafariWebPageLoading() -- or:
	-- my waitSafariWebPageLoading2(20)
	get document 1's source
end tell

on waitSafariWebPageLoading()
	tell application "System Events" to tell application process "Safari"
		repeat until (UI element "Reload this page" of group 3 of toolbar 1 of window 1 exists) or (UI element "Reload this page" of group 2 of toolbar 1 of window 1 exists)
			delay 0.1
		end repeat
	end tell
end waitSafariWebPageLoading

on waitSafariWebPageLoading2(loadingWaitMaximumSeconds as integer)
	set lineChangingChars to {linefeed, return, character id 11, character id 12, character id 133, character id 8232, character id 8233}
	set {ATID, htmlEnding} to {AppleScript's text item delimiters, ""}
	tell application "Safari"
		repeat 100 * loadingWaitMaximumSeconds times -- wait maximum seconds
			delay 0.1
			set AppleScript's text item delimiters to {"<", ">"}
			try
				copy text item -2 of (get source of front document) to htmlEnding
			end try
			set AppleScript's text item delimiters to lineChangingChars
			set htmlEnding to text items of htmlEnding
			set AppleScript's text item delimiters to ""
			set htmlEnding to "<" & htmlEnding & ">"
			if htmlEnding is "</html>" then exit repeat
		end repeat
	end tell
	set AppleScript's text item delimiters to ATID
	if htmlEnding is "</html>" then return true
	display notification "The webpage loading failed"
	return false
end waitSafariWebPageLoading2
#3

Perhaps it would be possible to build a JavaScript script that

  • loads the required page (perhaps in an iFrame),
  • uses a DOMContentLoaded handler,
  • in which it returns the content of the document!

that would avoid the polling and (if it’s possible at all) be a reliable way to get the content when it’s available.

Here’s a related article How to Implement an onload Event in iframe in JavaScript

#5

Have you seen or tried this AppleScript native function

on waitPageLoaded()
	tell application "System Events"
		repeat until exists (buttons of groups of toolbar 1 of window 1 of process "Safari" whose title = "Reload this page")
			delay 0.5
		end repeat
	end tell
end waitPageLoaded