jquery.autosize.js
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jquery.autosize.js
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	/*!
	autosize 4.0.2
	license: MIT
	http://www.jacklmoore.com/autosize
	*/
	( function ( global, factory ) {
	if ( typeof define === 'function' && define.amd ) {
	define( [ 'module', 'exports' ], factory );
	} else if ( typeof exports !== 'undefined' ) {
	factory( module, exports );
	} else {
	var mod = {
	exports: {}
	};
	factory( mod, mod.exports );
	global.autosize = mod.exports;
	}
	}( this, function ( module, exports ) {
	'use strict';

	var map = typeof Map === 'function' ? new Map() : ( function () {
	var keys = [],
	values = [];

	return {
	has: function has( key ) {
	return keys.indexOf( key ) > -1;
	},
	get: function get( key ) {
	return values[ keys.indexOf( key ) ];
	},
	set: function set( key, value ) {
	if ( keys.indexOf( key ) === -1 ) {
	keys.push( key );
	values.push( value );
	}
	},
	delete: function _delete( key ) {
	var index = keys.indexOf( key );
	if ( index > -1 ) {
	keys.splice( index, 1 );
	values.splice( index, 1 );
	}
	}
	};
	}() ),

	createEvent = function createEvent( name ) {
	return new Event( name, { bubbles: true } );
	};
	try {
	new Event( 'test' );
	} catch ( e ) {
	// IE does not support `new Event()`
	createEvent = function createEvent( name ) {
	var evt = document.createEvent( 'Event' );
	evt.initEvent( name, true, false );
	return evt;
	};
	}

	function assign( ta ) {
	if ( !ta \|\| !ta.nodeName \|\| ta.nodeName !== 'TEXTAREA' \|\| map.has( ta ) ) { return; }

	var heightOffset = null,
	clientWidth = null,
	cachedHeight = null;

	function init() {
	var style = window.getComputedStyle( ta, null );

	if ( style.resize === 'vertical' ) {
	ta.style.resize = 'none';
	} else if ( style.resize === 'both' ) {
	ta.style.resize = 'horizontal';
	}

	if ( style.boxSizing === 'content-box' ) {
	heightOffset = -( parseFloat( style.paddingTop ) + parseFloat( style.paddingBottom ) );
	} else {
	heightOffset = parseFloat( style.borderTopWidth ) + parseFloat( style.borderBottomWidth );
	}
	// Fix when a textarea is not on document body and heightOffset is Not a Number
	if ( isNaN( heightOffset ) ) {
	heightOffset = 0;
	}

	update();
	}

	function changeOverflow( value ) {
	{
	// Chrome/Safari-specific fix:
	// When the textarea y-overflow is hidden, Chrome/Safari do not reflow the text to account for the space
	// made available by removing the scrollbar. The following forces the necessary text reflow.
	var width = ta.style.width;
	ta.style.width = '0px';
	// Force reflow:
	/* jshint ignore:start */
	ta.offsetWidth;
	/* jshint ignore:end */
	ta.style.width = width;
	}

	ta.style.overflowY = value;
	}

	function getParentOverflows( el ) {
	var arr = [];

	while ( el && el.parentNode && el.parentNode instanceof Element ) {
	if ( el.parentNode.scrollTop ) {
	arr.push( {
	node: el.parentNode,
	scrollTop: el.parentNode.scrollTop
	} );
	}
	el = el.parentNode;
	}

	return arr;
	}

	function resize() {
	if ( ta.scrollHeight === 0 ) {
	// If the scrollHeight is 0, then the element probably has display:none or is detached from the DOM.
	return;
	}

	var overflows = getParentOverflows( ta ),
	docTop = document.documentElement && document.documentElement.scrollTop; // Needed for Mobile IE (ticket #240)

	ta.style.height = '';
	ta.style.height = ta.scrollHeight + heightOffset + 'px';

	// used to check if an update is actually necessary on window.resize
	clientWidth = ta.clientWidth;

	// prevents scroll-position jumping
	overflows.forEach( function ( el ) {
	el.node.scrollTop = el.scrollTop;
	} );

	if ( docTop ) {
	document.documentElement.scrollTop = docTop;
	}
	}

	function update() {
	resize();

	var styleHeight = Math.round( parseFloat( ta.style.height ) ),
	computed = window.getComputedStyle( ta, null ),

	// Using offsetHeight as a replacement for computed.height in IE, because IE does not account use of border-box
	actualHeight = computed.boxSizing === 'content-box' ? Math.round( parseFloat( computed.height ) ) : ta.offsetHeight;

	// The actual height not matching the style height (set via the resize method) indicates that
	// the max-height has been exceeded, in which case the overflow should be allowed.
	if ( actualHeight < styleHeight ) {
	if ( computed.overflowY === 'hidden' ) {
	changeOverflow( 'scroll' );
	resize();
	actualHeight = computed.boxSizing === 'content-box' ? Math.round( parseFloat( window.getComputedStyle( ta, null ).height ) ) : ta.offsetHeight;
	}
	} else {
	// Normally keep overflow set to hidden, to avoid flash of scrollbar as the textarea expands.
	if ( computed.overflowY !== 'hidden' ) {
	changeOverflow( 'hidden' );
	resize();
	actualHeight = computed.boxSizing === 'content-box' ? Math.round( parseFloat( window.getComputedStyle( ta, null ).height ) ) : ta.offsetHeight;
	}
	}

	if ( cachedHeight !== actualHeight ) {
	cachedHeight = actualHeight;
	var evt = createEvent( 'autosize:resized' );
	try {
	ta.dispatchEvent( evt );
	} catch ( err ) {
	// Firefox will throw an error on dispatchEvent for a detached element
	// https://bugzilla.mozilla.org/show_bug.cgi?id=889376
	}
	}
	}

	var pageResize = function pageResize() {
	if ( ta.clientWidth !== clientWidth ) {
	update();
	}
	},

	destroy = function ( style ) {
	window.removeEventListener( 'resize', pageResize, false );
	ta.removeEventListener( 'input', update, false );
	ta.removeEventListener( 'keyup', update, false );
	ta.removeEventListener( 'autosize:destroy', destroy, false );
	ta.removeEventListener( 'autosize:update', update, false );

	Object.keys( style ).forEach( function ( key ) {
	ta.style[ key ] = style[ key ];
	} );

	map.delete( ta );
	}.bind( ta, {
	height: ta.style.height,
	resize: ta.style.resize,
	overflowY: ta.style.overflowY,
	overflowX: ta.style.overflowX,
	wordWrap: ta.style.wordWrap
	} );

	ta.addEventListener( 'autosize:destroy', destroy, false );

	// IE9 does not fire onpropertychange or oninput for deletions,
	// so binding to onkeyup to catch most of those events.
	// There is no way that I know of to detect something like 'cut' in IE9.
	if ( 'onpropertychange' in ta && 'oninput' in ta ) {
	ta.addEventListener( 'keyup', update, false );
	}

	window.addEventListener( 'resize', pageResize, false );
	ta.addEventListener( 'input', update, false );
	ta.addEventListener( 'autosize:update', update, false );
	ta.style.overflowX = 'hidden';
	ta.style.wordWrap = 'break-word';

	map.set( ta, {
	destroy: destroy,
	update: update
	} );

	init();
	}

	function destroy( ta ) {
	var methods = map.get( ta );
	if ( methods ) {
	methods.destroy();
	}
	}

	function update( ta ) {
	var methods = map.get( ta );
	if ( methods ) {
	methods.update();
	}
	}

	var autosize = null;

	// Do nothing in Node.js environment and IE8 (or lower)
	if ( typeof window === 'undefined' \|\| typeof window.getComputedStyle !== 'function' ) {
	autosize = function autosize( el ) {
	return el;
	};
	autosize.destroy = function ( el ) {
	return el;
	};
	autosize.update = function ( el ) {
	return el;
	};
	} else {
	autosize = function autosize( el, options ) {
	if ( el ) {
	Array.prototype.forEach.call( el.length ? el : [ el ], function ( x ) {
	return assign( x, options );
	} );
	}
	return el;
	};
	autosize.destroy = function ( el ) {
	if ( el ) {
	Array.prototype.forEach.call( el.length ? el : [ el ], destroy );
	}
	return el;
	};
	autosize.update = function ( el ) {
	if ( el ) {
	Array.prototype.forEach.call( el.length ? el : [ el ], update );
	}
	return el;
	};
	}

	exports.default = autosize;
	module.exports = exports.default;
	} ) );

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