README.md

viewport.jquery

About

viewport is simple but handy jQuery plugin adding methods and CSS selectors to check if element is in certain viewport. Furthermore - you will be able to check position relation of two separate elements even if the are not kins. Plugin uses getBoundingClientRect() to determine elements positions so be sure it meets your browser support the requirements. ] version 1.x.x uses different detection principe, which will work in almost any browser but works 10-30 times slower

Requirements

• jQuery 3+ (written and tested with 3.3.1)

Installation

Download it from GitHub, or install via NPM:

npm i viewport.jquery

Include it in your JS code or link it in html page

[script src="viewport.jquery.js" type="text/javascript"][/script]

Now you able to

$(".myAwesomeElement:in-viewport").yaay();
// or
$(".myAwesomeElement").viewport().inViewport(); // true if in viewport

Usage

viewport.jquery provides you two different way of relation detection: CSS pseudo-selectors and jQuery methods

CSS pseudo-selectors

All following selectors can be used without parameters and bracket.

threshold parameter must be an integer, it extends (if it positive) or reduces (if it negative) viewport sizes, but only in calculations.

viewportSelector parameter must be a string, determines the selector of element that will be treated like a viewport, if more than one element corresponds given selector - the first one of them will be used. Otherwise viewport will be found in element's parents, it will be first element that has scroll or the BODY element of none.

General

:hasScroll
:hasScrollVertical
:hasScrollHorizontal

It will filter element if it has a scroll possibility, in meaning that element contents has bigger sizes than it's own.

:inViewport([ int threshold = 0 [, string viewportSelector ]])

It will filter the element if each it's border is within or equal viewport's borders.

Any side of element exceeds viewport's borders

:aboveTheViewport([ int threshold = 0 [, string viewportSelector ]])
:belowTheViewport([ int threshold = 0 [, string viewportSelector ]])
:leftOfViewport([ int threshold = 0 [, string viewportSelector ]])
:rightOfViewport([ int threshold = 0 [, string viewportSelector ]])

Any side of element is within viewport's borders

:aboveTheViewportPartly([ int threshold = 0 [, string viewportSelector ]])
:belowTheViewportPartly([ int threshold = 0 [, string viewportSelector ]])
:leftOfViewportPartly([ int threshold = 0 [, string viewportSelector ]])
:rightOfViewportPartly([ int threshold = 0 [, string viewportSelector ]])

Element exceeds viewport size and cant fit it

:exceedsViewport([ int threshold = 0 [, string viewportSelector ]])
:exceedsViewportVertical([ int threshold = 0 [, string viewportSelector ]])
:exceedsViewportHorizontal([ int threshold = 0 [, string viewportSelector ]])

jQuery methods

$('').viewport().hasScroll();

Return: boolean, representing if element has scroll;

$('').viewport().scrollableParent();

Return:
HTMLElement, representing first parent element that has scroll or BODY element oif none;

$('').viewport().relativePosition([ viewport = undefined ]);

viewport can be both HTMLElement or jQuery object, meaning as for CSS selectors;

Return: object:
    viewport - reference to viewport element relations was calculated
    viewportWidth - viewport's width in pixels on calculation moment
    viewportHeight - viewport's height in pixels on calculation moment
    element - reference to element relations was calculated for
    elementWidth - element's width in pixels on calculation moment
    elementHeight - element's height in pixels on calculation moment
    top - distance in pixels from top border of element to top border of viewport
    bottom - distance in pixels from bottom border of element to bottom border of viewport
    left - distance in pixels from left border of element to left border of viewport
    right - distance in pixels from right border of element to right border of viewport

$('').viewport().inViewport([ threshold = 0 [, viewport = undefined ]]);

threshold must be an integer, meaning as for CSS selectors;
viewport can be both HTMLElement or jQuery object, meaning as for CSS selectors;

$('').viewport().getState([ threshold = 0 [, allowPartly = false [, viewport = undefined ]]]);

threshold must be an integer, meaning as for CSS selectors;
allowPartly must be a boolean, allow 'partly' states. Extra calculations will be made if true
viewport can be both HTMLElement or jQuery object, meaning as for CSS selectors;

Return:
object:
    inViewport - boolean, is element fully fits viewport
    vertical - string, element's state along vertical axis relatively to viewport
    horizontal - string, element's state along horizontal axis relatively to viewport
    viewport - reference to viewport element relations was calculated
    viewportWidth - viewport's width in pixels on calculation moment
    viewportHeight - viewport's height in pixels on calculation moment
    element - reference to element relations was calculated for
    elementWidth - element's width in pixels on calculation moment
    elementHeight - element's height in pixels on calculation moment
    top - distance in pixels from top border of element to top border of viewport
    bottom - distance in pixels from bottom border of element to bottom border of viewport
    left - distance in pixels from left border of element to left border of viewport
    right - distance in pixels from right border of element to right border of viewport

vertical field can be: inside, exceeds, top, partly-top, below, partly-below horizontal field can be: inside, exceeds, left, partly-left, right, partly-right