[Chrome.ahk] Check if a button exists Topic is solved

[Loop]

Hey,

How can I check if a button exists on a web page, and if exists click on it.
if the button does not exist i get an error message

---------------------------
Error: TypeError: Cannot read property 'click' of undefined
---------------------------

Execute this code only if the button is present.

Code: Select all

PageInst.Evaluate("document.getElementsByClassName('btn-block')[0].click()")

many thanks

[gregster]

I have used try/catch (repeatedly, with a little sleep and a timeout) in similar circumstances with Chrome.ahk.

[Loop]

thanks, it worked

Code: Select all

try {
PageInst.Evaluate("document.getElementsByClassName('btn-block')[0].click()")
} catch e {
 sleep, 500
}

[gregster]

I thought of something like this, to have it actually repeat a couple of times, in case it fails.

Code: Select all

count := 0

clickit:
try PageInst.Evaluate("document.getElementsByClassName('btn-block')[0].click()")
catch {
	If (count++ < 5) {	
		sleep, 500
		gosub clickIt
	}
	else
		msgbox Oh no, it timed out!
}

In your code above, the error gets caught, it waits, but that's it then... it doesn't try again and just continues, without having clicked.
Or do you loop it? But where do you break it, in case of success?