Yes, having a read of that tutorial myself, those book buttons have a general code statement that runs and applies to all of them and not as separate buttons within the code.
So, in theory, they should all work if everything is set up correctly, so it seems a bit odd that just the one button for the pole classes doesn’t seem to work whilst all the rest of the book buttons do.
I would go back through your code and thoroughly check it and double check it, especially around the pole classes data in your dataset and around step 6 where you get all classes and on step 13 where you add all the button options etc., just to make sure that you haven’t missed out something in your dataset or you haven’t got the pole classes down as class type or you’ve missed something out in the code from the tutorial that should have been in there.
If it was something simple like your book button id being called something slightly different to what you have in your code, then that should have been easy to spot as it would only be affecting that one button and not moving around randomly to wherever your pole classes fall.
Sp to me it as it returns a no error on just your pole options, it would indicate that there is an error in your pole classes somewhere, like I’ve said above it might just be some simple error in the code or you don’t have the pole sessions in your dataset set as class type, mostly always a simple solution like that!
You might find it easier too, to copy all your page code into something like Microsoft Word or a text file for example and then have that up on screen along with the tutorial page, so that you can simply match and read the code as you scroll down the pages.
I’ve often done that on logner codes, so I have one side of my screen with the tutorial window code and the other half of my screen with my own code file, so that I can simply double check code without having to go back and forth between the two etc.
Anyways, see what you can spot and come back if you still don’t have any luck, fingers crossed though.
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