Question

fiddle – just want it to scroll horizontally according to documentation example. I’ve no idea why it is not working.

$('#container').isotope({
  masonry: {
    columnWidth: 240
  }
});

Answer 1

You forgot to use the option layoutMode that tells it to use the horizontal layout.

$('#container').isotope({
    layoutMode: 'masonryHorizontal',
    masonryHorizontal: {
        rowHeight: 160
    },
    resizesContainer: false
});

notice: the documentation seems to be missing that too, but mentions it for all other options so you can infer it