Synchronizing 2 ListViews

[Pablo Bertu]

Hi!

What´s the easiest way to keep 2 lists synchronized? when user selects, say, item #3 in the 1st listview, I´d like the 2nd listview to select the third item at the same time.

So far I have tried this:

The "IF" block is only to make sure that I don´t try to position the second list in an item higher than its current size.

Any ideas? Thanks!

Bertu

[TimAI2]

Put both listviews inside a vertical scrolling arrangement and make the height of the listviews bigger than the arrangement. They should work together.

[TimAI2]

Also see

ai2.appinventor.mit.edu/?galleryId=4990166434054144

[Abraham Getzler]

If your two lists are that well matched, you can just

turn the two lists into a two column table (list of lists),

and show just a single List View populated with

text CSV rows, like in this example:

https://docs.google.com/document/d/1jEx4wJsvGLfsMAjvY5ft2gT8LpTuS2ceLICO3frJaU4/edit#heading=h.l42irwdtmeeh

Each Element would contain the comma separated values at that index

from the two lists, populated by you in the Before Picking event.

ABG

[Abraham Getzler]

If you want to be sneaky, trim the tops off the two ListView

Elements lists based on a Canvas TouchUp

event on a pretend scroll bar.

Also, there might be a way using a scrollable arrangement

around the two ListViews, if I remember right.

ABG

[Pablo Bertu]

Great support and ideas from both Tim and Abraham! Thanks, I will test it soon and let you know how it goes.

Saludos!

Bertu