You could use variables to track what layers have and have not been visited. For example, have T/F variables, and change a given variable to True when the associated layer has been visited.
Then, on Slide 2, the triggers to "advance" would need conditions that check the variables. For example, one trigger would jump to slide 1 with the conditions that any of the variables for B, C, and D are still False. Another trigger would jump to slide 3 with the conditions that all of the variables for B, C, and D are True.
Here are the User Guide entries about variables and conditions:
Want an easier solution? Instead of jumping to slide 2, open it in a lightbox. That basically keeps the user on slide 1, since a lightbox opens on top of the current slide. Have the NEXT button on slide 1 go to slide 3. But keep it disabled until all the layers have been visited. Here's more about how to do that:
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You could use variables to track what layers have and have not been visited. For example, have T/F variables, and change a given variable to True when the associated layer has been visited.
Then, on Slide 2, the triggers to "advance" would need conditions that check the variables. For example, one trigger would jump to slide 1 with the conditions that any of the variables for B, C, and D are still False. Another trigger would jump to slide 3 with the conditions that all of the variables for B, C, and D are True.
Here are the User Guide entries about variables and conditions:
Want an easier solution? Instead of jumping to slide 2, open it in a lightbox. That basically keeps the user on slide 1, since a lightbox opens on top of the current slide. Have the NEXT button on slide 1 go to slide 3. But keep it disabled until all the layers have been visited. Here's more about how to do that:
Check this Sample.
If Layer A is visited last, then the progress is from 1 to 2 to 3. If not, it progresses from 1 to 2 to 1.