autosize comment textareas

closes #194

app/assets/javascripts/application.js.erb

@@ -188,7 +188,10 @@ var _Lobsters = Class.extend({
     var params = $(form).serializeArray();
     params.push({"name": "preview", "value": "true"});
     $.post($(form).attr("action"), params, function(data) {
-      $(form).closest('.comment').replaceWith($.parseHTML(data));
+      var da = $.parseHTML(data);
+      var ta = $(da).find("textarea");
+      $(form).closest(".comment").replaceWith(da);
+      autosize(ta);
     });
   },
 
@@ -343,7 +346,9 @@ $(document).ready(function() {
       var reply = $($.parseHTML(data));
       reply.attr("id", "reply_form_" + comment.attr("id"));
       replies.prepend(reply);
-      reply.find("textarea").focus().text(sel);
+      var ta = reply.find("textarea");
+      ta.focus().text(sel);
+      autosize(ta);
     });
 
     return false;

app/assets/javascripts/autosize.js

@@ -0,0 +1,214 @@
+/*!
+	Autosize 3.0.8
+	license: MIT
+	http://www.jacklmoore.com/autosize
+*/
+(function (global, factory) {
+	if (typeof define === 'function' && define.amd) {
+		define(['exports', 'module'], factory);
+	} else if (typeof exports !== 'undefined' && typeof module !== 'undefined') {
+		factory(exports, module);
+	} else {
+		var mod = {
+			exports: {}
+		};
+		factory(mod.exports, mod);
+		global.autosize = mod.exports;
+	}
+})(this, function (exports, module) {
+	'use strict';
+
+	function assign(ta) {
+		var _ref = arguments[1] === undefined ? {} : arguments[1];
+
+		var _ref$setOverflowX = _ref.setOverflowX;
+		var setOverflowX = _ref$setOverflowX === undefined ? true : _ref$setOverflowX;
+		var _ref$setOverflowY = _ref.setOverflowY;
+		var setOverflowY = _ref$setOverflowY === undefined ? true : _ref$setOverflowY;
+
+		if (!ta || !ta.nodeName || ta.nodeName !== 'TEXTAREA' || ta.hasAttribute('data-autosize-on')) return;
+
+		var heightOffset = null;
+		var overflowY = 'hidden';
+
+		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);
+			}
+
+			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;
+			}
+
+			overflowY = value;
+
+			if (setOverflowY) {
+				ta.style.overflowY = value;
+			}
+
+			resize();
+		}
+
+		function resize() {
+			var htmlTop = window.pageYOffset;
+			var bodyTop = document.body.scrollTop;
+			var originalHeight = ta.style.height;
+
+			ta.style.height = 'auto';
+
+			var endHeight = ta.scrollHeight + heightOffset;
+
+			if (ta.scrollHeight === 0) {
+				// If the scrollHeight is 0, then the element probably has display:none or is detached from the DOM.
+				ta.style.height = originalHeight;
+				return;
+			}
+
+			ta.style.height = endHeight + 'px';
+
+			// prevents scroll-position jumping
+			document.documentElement.scrollTop = htmlTop;
+			document.body.scrollTop = bodyTop;
+		}
+
+		function update() {
+			var startHeight = ta.style.height;
+
+			resize();
+
+			var style = window.getComputedStyle(ta, null);
+
+			if (style.height !== ta.style.height) {
+				if (overflowY !== 'visible') {
+					changeOverflow('visible');
+				}
+			} else {
+				if (overflowY !== 'hidden') {
+					changeOverflow('hidden');
+				}
+			}
+
+			if (startHeight !== ta.style.height) {
+				var evt = document.createEvent('Event');
+				evt.initEvent('autosize:resized', true, false);
+				ta.dispatchEvent(evt);
+			}
+		}
+
+		var destroy = (function (style) {
+			window.removeEventListener('resize', update);
+			ta.removeEventListener('input', update);
+			ta.removeEventListener('keyup', update);
+			ta.removeAttribute('data-autosize-on');
+			ta.removeEventListener('autosize:destroy', destroy);
+
+			Object.keys(style).forEach(function (key) {
+				ta.style[key] = style[key];
+			});
+		}).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);
+
+		// 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);
+		}
+
+		window.addEventListener('resize', update);
+		ta.addEventListener('input', update);
+		ta.addEventListener('autosize:update', update);
+		ta.setAttribute('data-autosize-on', true);
+
+		if (setOverflowY) {
+			ta.style.overflowY = 'hidden';
+		}
+		if (setOverflowX) {
+			ta.style.overflowX = 'hidden';
+			ta.style.wordWrap = 'break-word';
+		}
+
+		init();
+	}
+
+	function destroy(ta) {
+		if (!(ta && ta.nodeName && ta.nodeName === 'TEXTAREA')) return;
+		var evt = document.createEvent('Event');
+		evt.initEvent('autosize:destroy', true, false);
+		ta.dispatchEvent(evt);
+	}
+
+	function update(ta) {
+		if (!(ta && ta.nodeName && ta.nodeName === 'TEXTAREA')) return;
+		var evt = document.createEvent('Event');
+		evt.initEvent('autosize:update', true, false);
+		ta.dispatchEvent(evt);
+	}
+
+	var autosize = null;
+
+	// Do nothing in Node.js environment and IE8 (or lower)
+	if (typeof window === 'undefined' || typeof window.getComputedStyle !== 'function') {
+		autosize = function (el) {
+			return el;
+		};
+		autosize.destroy = function (el) {
+			return el;
+		};
+		autosize.update = function (el) {
+			return el;
+		};
+	} else {
+		autosize = function (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;
+		};
+	}
+
+	module.exports = autosize;
+});

app/assets/stylesheets/application.css

@@ -134,6 +134,10 @@ input[type="email"],
 textarea {
 	border: 1px solid #ccc;
 }
+input:focus, textarea:focus {
+	outline-style: solid;
+	outline-width: 2px;
+}
 input[type="checkbox"] {
 	margin-top: 0.5em;
 }