near-viewport

A jQuery selector to find elements near the viewport.

$ bower i jquery-near-viewport --save
$ npm i jquery-near-viewport --save

Selecting visible elements

By default the selector will match elements that are at least partially showing in the viewport.

var visibleImages = $('img:near-viewport');

Testing if an element is visible

The selector can be used with .is() to test if an element is or is not in range of the viewport.

var pixel = $('#lower-tp');
if (pixel.is(':near-viewport')) {
    pixel.recordMetrics();
}

Using the offset option

An offset can be set which will increase the range beyond the viewport both top and bottom. For example, if given an offset of 100, then items will match 100px above the viewport and 100px below the viewport.

$('.ad:near-viewport(100)').loadFromServer();

Formats

Near-Viewport is provided in three formats: as a jQuery selector, as a pure JavaScript global function, and as a Browserify/Node/CommonJS module.

jQuery Selector

The selector will try to load itself into the global jQuery object. This means that the dist/jquery-near-viewport.min.js file should be loaded immediately after the main jquery.min.js library is loaded.

Pure JS Global Function

The global version can be used in any project and has zero dependencies. Cross browser testing is done via SauceLabs (see chart above). Just use dist/near-viewport.js instead of the jQuery plugin.

var el = document.getElementById('mydiv'),
    visible = nearViewport(el),
    nearby = nearViewport(el, 100);

Browserify/CommonJS Module

To build Near-Viewport with your Browserify bundle, just install with npm install jquery-near-viewport and then require it like usual.

var nearViewport = require('jquery-near-viewport'),
    el = document.getElementById('mydiv'),
    visible = nearViewport(el),
    nearby = nearViewport(el, 100);

• See: http://github.com/cobbdb/jquery-near-viewport
• License: MIT