Question

First, I am really sorry for my poor english…

Now I doing PhoneGap development.
I use iScroll to make listview scrolling.
And I want to get the scrolling direction.

For sample, when I slide down the screen, the scroller will scroll up.When I slide up the screen, the scroller will scroll down, And how to get the scroller’s direction when it scrolling?

can anyone help?
I will be grateful!

Answer 1

I had the same self-question and ended up using .dirX and .dirY properties of the iScroll instance. Their value is always either 1 (left/up), 0 (none) or -1 (right/down), which nicely evaluates to true if the direction is on the particular axis.

new iScroll("your_element_id", {
    onTouchEnd: function(){
        alert(this.dirX); // Returns 1, 0 or -1
        alert(!!this.dirX); // Returns true for horizontal
    }
});

As I need to get the direction of a flick I use onTouchEnd event, but the same applies to onScrollMove (and possibly other events) too.