Simple and easy to use jQuery plugin to observe document scroll. It executes two callbacks: first when document reach defined offset and second when document scrolled back.

Based on offset of the element in DOM. (See demo).

Based on pre-defined static offset. (See demo).

Use function to calculate offset. (See demo).

Attach to variable,

Check state:

Run callbacks manually:

By default manual execution of callbacks does not change state. Pass Bool value in order to change instance state:

offset - set value when callbacks shoud be executed.

gap - gap between defined offset and current document offset.

once - callbacks will be executed once.

customEvents - adds events which scrollTrigger should react (By default: ready, touchmove, scroll).