Programmatically scroll the viewport to a given element...

[Lindon]

I have a viewport, with 1000 items in it... is there a way to script the viewport scroll to (say) item 340? or 670? etc.

[d.healey]

@Lindon Yes - you need to calculate the size of the rows so you can calculate the position. Then you use viewport.set("viewPositionY", value);

Here's an example from one of my projects - https://codeberg.org/LibreWave/RhapsodyBoilerplate/src/branch/main/includes/Articulations.js#L280

In this case I'm not using the built in list. I'm using a panel within the viewport to draw the list (and provide some interactivity).

[Lindon]

@d-healey ok thanks....off to calculate the height of my rows....

[d.healey]

@Lindon viewportHeight / numItems ?

[Lindon]

@d-healey said in Programmatically scroll the viewport to a given element...:

@Lindon viewportHeight / numItems ?

not quite... as you can see....

but some quick resizing of the viewport worked this out for me...

[Lindon]

@Lindon no -its massively unreliable - if you ask for the same Y position twice it scrolls to the bottom of the list , and it scrolls to the bottom of the list randomly as well....

[d.healey]

Looks like it's simpler than I thought, the Y value needs to be normalized so no need to calculate the row height.

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[Lindon]

@d-healey said in Programmatically scroll the viewport to a given element...:

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yep - that looks like it was it.. thanks again.