Dependency-free JS module to freeze body scroll when opening modal box. 

Dependency-free JS module to freeze body scroll when opening modal box

ramonvictor

body-scroll-freezer

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		@@ -6,3 +6,3 @@ {
		"license": "MIT",
		"version": "1.0.0",
		"version": "1.0.1",
		"main": "docs/js/body-scroll-freezer.min.js",
		@@ -9,0 +9,0 @@ "homepage": "https://github.com/ramonvictor/body-scroll-freezer/",

		@@ -11,21 +11,30 @@ # body-scroll-freezer

		## A note on performance

		Many other alternatives to this module listen to both `mousewheel` and `DOMMouseScroll` events in order to get some information from the DOM, which usually includes: `Element.scrollTop`, `event.deltaY`, `Element.scrollHeight` or `Element.clientHeight`. Check this [StackOverflow answer](http://stackoverflow.com/questions/5802467/prevent-scrolling-of-parent-element#answer-16324762) as an example.

		The problem is that most of those DOM operations (`.scrollTop` and `.scrollHeight`, for example) are expensive because they [force layout/reflow](https://gist.github.com/paulirish/5d52fb081b3570c81e3a). For more info on scrolling performance [check out this article](https://www.html5rocks.com/en/tutorials/speed/scrolling/).

		So, to avoid all that, body-scroll-freezer just assigns `overflow: hidden;` and `padding-right: [scrollWidth]px;` to the `<body>`.
		The `overflow` avoids vertical move on the background when users are scrolling within the modal box. The `padding-right` prevents horizontal jumps when hiding/showing the scrollbar.

		## Usage

		```js
		var bodyScroll = require('body-scroll-freezer'); // If no AMD/CommonJS: window.bodyScrollFreezer;
		// If no AMD/CommonJS: window.bodyScrollFreezer;
		var bodyScroll = require('body-scroll-freezer');
		```

		1 - Init to calculate scroll bar width.
		1\. Init to calculate scroll bar width.

		```js
		// Note: store init() return in a variable is optional.
		// Note: declaring variable to store init() return is optional.
		var scrollWidth = bodyScroll.init();
		```

		2 - Turn scroll freeze ON when closing modal. Example:
		2\. Turn scroll freeze ON when closing modal. Example:

		```js
		document.querySelector('.modal-open').addEventListener('click', function() {
		modal.style.display = 'block';
		// Freeze on modal open
		// Logic to show modal goes here
		bodyScroll.freeze();
		@@ -35,8 +44,7 @@ }, false);

		3 - Turn scroll freeze OFF when closing modal. Example:
		3\. Turn scroll freeze OFF when closing modal. Example:

		```js
		document.querySelector('.modal-close').addEventListener('click', function() {
		modal.style.display = 'none';
		// Unfreeze on modal open
		// Logic to hide modal goes here
		bodyScroll.unfreeze();
		@@ -43,0 +51,0 @@ }, false);

Improved metrics